JPH09259521A - Information playback device - Google Patents

Abstract

The speed of reading information from a recording medium can be determined with a simple configuration and a simple operation, and the rhythm pitch and timing of the reproduction data of the second information reproducing apparatus can be determined by the first information reproducing apparatus. There is provided an information reproducing device which can be used for matching with the above. A motor 22 of an output control signal generator 21 is provided.
The turntable 23 on which the ring 24 is disposed is rotated at a predetermined speed by the
The output of No. 5 is input to the rotation speed detection unit 26, and this output is compared with the output of the reference signal generation unit by the speed comparison device 19 to determine whether the turntable 23 is rotating at a predetermined speed or the rotation is manually delayed. It is configured to control the rotation of the spindle motor 1 by the CPU system control 14 to control the rotation speed of the disk 2 by determining whether the rotation speed of the disk 2 is increased or the rotation speed of the disk 2 is manually increased to determine the information reading speed. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing apparatus represented by a compact disc player for reproducing information of digital signals, and more particularly to an information reproducing apparatus capable of changing the speed of reproducing information from a recording medium. It is a thing.

[0002]

2. Description of the Related Art A conventional information reproducing apparatus will be described by taking a compact disc player as an example. FIG. 13 is a block diagram of a compact disc player which is a conventional information reproducing apparatus. A general digital signal flow will be briefly described below with reference to this drawing. The disk 2 is rotated by the rotation of the spindle motor 1, and an optical pickup 3 provided near the disk 2 reads a digital signal engraved on the disk 2. One of the signals is called an RF signal and enters the analog waveform shaping block 4 in the figure, and the other is called a servo signal and enters a servo signal processing block 5. The servo signal is a detection signal for continuously and accurately reading pits, which are information engraved on the disc.

The RF signal is an analog waveform shaping block 4
After passing through, it becomes a pulse train waveform according to the information, and PL
The L circuit block 6 converts it into an impulse waveform, and the output of the synchronization detection circuit block 7 produces a pulse train waveform corresponding to the clock frequency. The digital signal processing block 8
Is input to This clock frequency is set to a fixed value in the case of a compact disc, and specifically 4.32.
Although it is 18 MHz, it is assumed to be f1 Hz for convenience of description.

The information digitally processed by the digital signal processing circuit block 8 is once stored in the RAM block 9, and then the information is read at the clock frequency corresponding to the crystal oscillator in the digital signal processing circuit 8. , D
The signal is input to the / A converter circuit block 10 and converted into an analog waveform, which then appears at the output terminal as a left (L) channel signal and a right (R) channel signal.

Further, recently, there is also an apparatus for reproducing by slightly changing the clock frequency f1. Now, suppose that the clock frequency change is Δf1 and the clock frequency is (f
1 + Δf1) Hz, the reading speed of information from the disk 2 is also changed at a rate according to the change, and similarly, the sampling frequency when converting the read digital signal into an analog signal is also changed. Change. Then, the rhythm pitch of the output can be changed compared with that of the normal output. If the ratio is ΔP, the numerical value is derived by the following equation.

ΔP = ((f1 + Δf1) / f1) × 100 (%) Using such a compact disc player, a disc that is currently read and output, and a disc that is next read and output. There are disco clubs and other clubs that perform continuous playing without being noticed the change in rhythm pitch. This will be described below.

FIG. 14 shows the connection of a conventional continuous performance system. Reference numerals 101 and 102 denote compact disc players (hereinafter abbreviated as CD players) A and B, respectively, and slide switches 101a and 102 are provided on the front surfaces thereof.
a is provided, and the slide switches 101a and 102 are provided.
By the movement of a, each CD by the principle explained above
The rhythm pitch of the outputs of the players A101 and B102 can be changed. 103 is a mixer,
It plays a role of mixing the output signals of the CD players A101 and B102, and is configured so that the output levels from the mixers 103 of the respective CD players A101 and B102 can be varied by the adjusters 103a and 103b provided in the mixer 103. ing.

Reference numeral 104 denotes a monitor headphone, which is C
The mixed output of the D players A101 and B102 can be heard regardless of the adjusters 103a and 103b. The output of the mixer 103 is input to the amplifier 105,
The amplified signal is converted into an acoustic signal by the speaker 106, and a sound wave is radiated into space.

The operation of the conventional continuous performance system configured as described above will be described below. First, CD player A10
At 1, the first music is reproduced. This output is the amplifier 10
It is amplified by 5 and becomes a sound through the speaker. In the meantime, while the headphone 104 monitors the music, the second music to be reproduced next is operated by the CD player B102, and the headphone 104 is simultaneously monitored, and the slide switch 102a is operated to operate the first music. Match the rhythm pitch with the song. Then, after adjusting the rhythm pitch, the CD player B102 is repeatedly started and stopped, the timing is adjusted, and at the same time, the start button of the CD player B102 is pressed to reproduce the second song. . Alternatively, when the timing of the first music and the timing of the second music arrive, the mixer 103
The first piece of music is ended by narrowing down the adjuster 103a, and the second piece of music is started by opening the adjuster 103b at the same time. Then, the sound can be played continuously without interruption.

However, in the conventional configuration, since a person performs such an operation, a highly skilled technique is required to match the rhythm pitch of the first music and the second music including the timing. . Therefore, the inventors of the present application have filed Japanese Patent Application No. 02-237518 in order to solve the above problems.
Suggested. This is a variable speed reading means for reading information from a recording medium on which a plurality of information blocks are recorded,
The information processing device further comprises storage means for storing output information of the reading means, control means for system operation, and rhythm control means for acting so as to match the rhythm pitch of the following second information block with the rhythm pitch of the first information block being reproduced. The reading means reads information faster than a specified speed for a predetermined period after starting reading and writes the information in the storage means, and the storage means is arranged to always read the stored information at a specified speed.

With the above-described structure, the information reading means reads information from the storage means at a speed higher than a prescribed speed for a predetermined period after the start of reading, and the storage means is arranged to read the stored information at the prescribed speed. Is arranged so that the rhythm pitch of the subsequent information is matched with the rhythm pitch of the currently reproduced information, the change of the rhythm pitch of continuous 2 information is not noticed, and smooth continuous reproduction of 2 information is possible. there were.

[0012]

The conventional information reproducing apparatus as described above requires a highly skilled technique, and the proposal by the inventor of the present application is an excellent one capable of automatic continuous reproduction by system control. However, a rhythm pitch control device,
There is a problem that the system control is complicated and the cost becomes very high.

The present invention has been made in order to solve the above-mentioned problems, and the rhythm pitch and timing of the information block of the succeeding second information reproducing apparatus can be calculated with a simple structure and simple operation. The purpose of the present invention is to provide an information reproducing apparatus which can be combined with the information block of the first information reproducing apparatus.

[0014]

In order to solve the above-mentioned problems, an information reproducing apparatus of the present invention comprises a variable speed reading means for reading information from a recording medium having a plurality of information blocks recorded thereon, and the read information. Outputting means for outputting, control means for system operation, detecting means provided separately from the variable speed reading means for detecting the rotation speed of the rotating body, detection signal output from the detecting means and a predetermined reference signal And a comparison means for comparing the above, and the variable speed reading means determines the speed at which the information is read from the recording medium based on the information output from the comparison means, and thus controls the rotation speed of the rotating body. The read speed from the information block can be changed by itself. That is, since the rhythm pitch and timing of the output information can be changed, use this device to match the rhythm pitch and timing of the reproduction data of the second information reproducing device with that of the first information reproducing device. You can

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises variable speed reading means for reading information from a recording medium having a plurality of information blocks recorded thereon, and output means for outputting the read information. System operation control means,
The variable speed reading means is provided separately from the variable speed reading means for detecting the rotational speed of the rotating body, and the comparing means for comparing the detection signal output from the detecting means with a predetermined reference signal. Since the variable speed reading means determines the speed at which the variable speed reading means reads information from the recording medium based on the information output from the comparing means, the reading speed from the information block can be changed only by controlling the rotation speed of the rotating body. it can. That is, it acts so that the rhythm pitch and timing of the output information can be changed.

According to a second aspect of the present invention, in the structure of the first aspect, the rotating body is a turntable provided on the rotating shaft, and the detecting means detects the rotational speed of the turntable. Therefore, the rhythm pitch and timing of the output information can be easily changed by quickly turning or stopping this turntable by hand.

According to a third aspect of the present invention, in the structure of the first aspect, the rotating body is a second turntable slidably arranged on the first turntable provided on the rotating shaft. In addition to the above effects, the output signal can be easily controlled because the detection means detects the rotation speed of the second turntable and can lightly rotate the second turntable. The operability can be improved without damaging the mechanism for driving the rotating body.

According to a fourth aspect of the present invention, a variable speed reading means for reading information from a recording medium having a plurality of information blocks recorded thereon, an output means for outputting the read information, and a control of system operation. Means and a first detection means for detecting the rotation speed of a first turntable provided on a rotary shaft of a rotating body provided separately from the variable speed reading means, and on the first turntable. Second detecting means for detecting the rotational speed of the slidably provided second turntable, and comparing means for comparing the output from the first detecting means with the output from the second detecting means. And the speed at which the information is read from the recording medium is determined by the information output from the comparison means, so that the second turntable is set to the first turntable based on the rotation of the first turntable. And it detects the relative turntable that change relatively, even if uneven rotation of the first turntable, acts to detect and cancel it.

According to a fifth aspect of the present invention, in the structure according to the first to fourth aspects, there are provided two detection means separated by a predetermined distance for detecting the rotation speed of the rotating body, and the two detection means. And a phase detecting means for detecting the rotation direction of the rotating body based on the output information of the rotating body, and it is possible to determine whether or not to reverse the reproduced position based on the information output from the phase detecting means. By simply controlling the rotation speed of the rotating body, the rhythm pitch and timing of the output information output from the storage means can be changed, and further by rotating the rotating direction of the rotating body in the opposite direction to the normal playing direction,
It works to enable reverse playback of output information and backward (rewind).

According to a sixth aspect of the present invention, in the structure of the first to fifth aspects, the rotating speed of the rotating body can be arbitrarily changed, and thereby, the rotating speed of the rotating body can be changed. The information reproduction speed can be obtained.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
Through FIG. 12 will be described. (Embodiment 1) FIG. 1 is a block diagram of a compact disc player which is an information reproducing apparatus according to Embodiment 1 of the present invention. Those functionally equivalent to those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The differences from the conventional example are the CPU system control 14, the servo signal processing block 15, and P.
LL block 16, digital signal processing circuit block 1
8, an output control signal generator 21, a reference signal generator 20, and a speed comparator 19.

The output control signal generator 21 includes a motor 22 which is a rotary drive source, a variable power source 27, and a motor 2.
2, a turntable 23 provided on the upper surface of the turntable 23, a ring 24 provided on the outer circumference of the turntable 23, and a detector 25.
And a rotation speed detector 26. The variable power supply 27 changes the voltage of the motor 22.
The rotation speed of can be changed.

FIG. 2A shows a sectional view of the rotating body. Since the turntable 23 is fixed to the shaft 22a of the motor 22, the turntable 23 rotates when the shaft 22a of the motor 22 rotates. . The ring 24 is shown in FIG.
As shown in (b), holes 24a are formed on the entire circumference at regular intervals. In general, the detector 25 is generally a transmissive recognition type light emitting / receiving element, and the light from the light emitting / receiving element is transmitted through the hole 24a of the ring 24, and is blocked at the portion without the hole to rotate the turntable 23. Outputs the number electrically.

The operation of the compact disc player, which is the information reproducing apparatus configured as described above, will be described below. As described with reference to FIG. 14 of the conventional example, it is assumed that two CD players are required for continuous performance, and that the first music piece is being reproduced by the CD player A. Then, the second music piece is reproduced by another CD player B. Then, as shown in FIGS. 4A and 4B, the rhythm pitch of the first music piece is a1, and the rhythm pitch of the second music piece is b1. In general, the rhythm pitch is the tempo of the song and is unique, so in many cases a1 and b1 do not match.

Therefore, when the CD player B of the present invention is used now, it will be as follows. First, the motor 22 of the output control signal generator 21 is rotated at a predetermined speed. Then, since the turntable 23 and the ring 24 rotate, the detector 25 detects the presence or absence of the hole 24a of the ring 24,
The rotation speed detector 26 outputs a signal whose waveform has been shaped.
This signal is shown in FIG. As shown in the figure, the output signal has a pulse waveform (rectangular wave), and the width (period) of one pulse is T1. This signal is sent to the speed comparison device 19
To enter. Then, in the speed comparison device 19, a comparison is made with one pulse width T0 of the signal from the reference signal generator 20. By setting 1 pulse width T1 from the output control signal generator 21 as a steady speed and using this as a reference, the 1 pulse width of the reference signal generator 20 can be set in advance to T0 = T1.
The output from the speed comparison device 19 is T0 / T1 = 1.
Therefore, a control command for performing a normal reproduction speed is sent to the CPU system control 14. It is assumed that this state is as shown in FIGS.

Then, as shown in FIG. 4B, the rhythm pitch b1 of the second music piece is slower than the rhythm pitch a1 of the first music piece, and therefore the rhythm pitch b1 needs to be increased. Therefore, the rotation speed of the motor 22 is increased by increasing the voltage of the power supply 27 of the output control signal generator 21. Then ring 24
Rotation also becomes faster, and the detector 25 detects that this rotation speed has become faster. Then, as shown in FIG. 3B, the output waveform of the rotation speed detection unit 26 has a one-pulse width T2 of T
Since it is shorter than 0, the output from the speed comparison device 19 becomes (T0 / T2)> 1 and sends a control command to the CPU system control 14 to make it faster than the normal reproduction speed. Here, for example, if T0 / T2 = 1.2,
You will be able to play songs 20% faster. Then, by adjusting the voltage of the power supply 27 so as to match the rhythm pitch a1 of the first song, the rhythm pitch of the second song can be changed to b2. This is shown in FIGS. 5 (a) and 5 (b).
In the figure, a1 and b2 are almost equal and the rhythm pitches match, but the timings of the first and second songs are time t1.
It is only shifted.

Then, the rotating turntable 23 of the output control signal generator 21 is lightly touched by hand. Then, since the rotation speed of the turntable 23 becomes slightly slower, the output of the detector 25 or the rotation speed detection unit 26 becomes
As shown in FIG. 3C, one pulse width T3 is larger than T2. When this output enters the speed comparison device 19,
The numerical value calculated by T3 / T0 is sent to the CPU system control 14. Then, the rhythm pitch of the second song changes later than b2, but the turntable 23
By releasing the hand touching, the rhythm pitch of the second music returns to b2 in the series of system operations described above. And this can change the timing of the song,
By performing the operation of touching the turntable 23 several times, the timings of the first music and the second music can be adjusted as shown in FIGS. 6 (a) and 6 (b). Then, after that, using the adjusters 103a and 103b of the mixer 103 of FIG. 14, the output of the performance of the first song is finished at a certain time t2, and the performance of the second song is played at a time t3, as shown in FIG. 6C. When output is performed, the times t2 and t3 are almost the same, so that the continuous performance can be smoothly connected from the first music to the second music without changing the rhythm pitch.

As described above, according to the present embodiment, the output speed of the information from the disc 2 is controlled by the rotation speed of the turntable 23, which is a rotating body, so that the rhythm pitch of the first music piece can be set to 2 degrees. The rhythm pitch of the music piece can be easily adjusted, and the rhythm timing can be adjusted by touching the turntable and temporarily changing the rhythm pitch.

Further, although the reference signal generator 20 actually generates the signal, it is equivalent if the reference period is recognized as a simple numerical value as the information input to the speed comparison device 19. Is possible. Therefore, in this case, the reference signal generator 20 may be a generator of a reference value.

Although the present embodiment is used as the reproducing device for the second music, it is needless to say that the CD player A used for the first music can also continuously reproduce the third and subsequent music by using this embodiment. Absent.

Although a compact disc player is used as the information reproducing apparatus, this principle can be applied to all digital signal data. Therefore, for example, even an analog signal is subjected to A / D conversion and placed in this apparatus. Needless to say, the same effect can be obtained.

Further, although the transmission recognition type light emitting / receiving element is used as the detector 25, if the ring 24 is made of a silver material having a high reflection efficiency, the reflection recognition type light receiving / emitting element is also used. The effect is obtained. Similarly, in addition to light, ring 24
It is also possible to disperse ferromagnetic materials at equal intervals like bar codes and magnetize them on the inner circumference, the outer circumference, or an appropriate place of the turntable 23, and magnetically detect them with a magnetic head close to them. . As described above, rotation detection is not limited to optical means, but can be performed by other methods, and the same applies to the following embodiments.

(Embodiment 2) Next, FIG. 7 shows a sectional view of a rotor of an output control signal generator of an information reproducing apparatus of Embodiment 2. The difference from the first embodiment is that a second turntable 29 is slidably provided on the turntable 23 via a seat 28, and the ring 3 is provided on the outer periphery thereof.
This is the point where 0 is set. The sheet 28 is adhered and fixed to the turntable 23, and the surface of the opposite side of the second turntable 29 is in a smooth state with small friction, and the second turntable 29 has the first surface. It is slidable with respect to the turntable and is easy to rotate about the shaft 22a. Further, the ring 30 is provided with holes around the entire circumference like the ring 24 described in the first embodiment. The block diagram of the information reproducing device is the same as that of FIG. 1 in the first embodiment except the part of the rotating body.

The operation of the second embodiment configured as described above will be described below. The turntable 23 is rotated by the motor 22, and the second turntable 29 is rotated via the seat 28. Then, since the ring 30 also rotates, the detector 25 detects the rotation speed. The signal flow and its operation are the same as those in the first embodiment.

Here, when changing the timing of the music being reproduced, the rotation of the second turntable 29 can be slowed by hand or turned quickly. Since the second turntable 29 is on the sheet 28 having small surface friction, the turntable 2 of the first embodiment is not provided.
The rotation can be changed more easily than when turning 3. That is, the timing of the music being reproduced can be easily changed.

Further, since the turntable 23 is not directly rotated as in the first embodiment, the rotary drive mechanism is not damaged, and there is an advantage that there is no failure due to use and the reliability is improved.

Similar effects can be obtained by using an analog record player with a pitch control function (for example, product number SL-1200MK3 manufactured by Matsushita) as the rotating body.

(Third Embodiment) FIG. 8 is a block diagram of an information reproducing apparatus according to the third embodiment. In the figure, the difference from the first embodiment is that a reference signal generator 33 is provided in the output control signal generator 31. FIG. 9 is a sectional view of a rotating portion of the output control signal generator 31 according to the same embodiment, and FIG. 10 is a top view of the rotating portion. A description will be given below with reference to these figures.

A shaft 22a of a motor 22 which is a rotation driving means.
A ring 24 is provided below the first turntable 23 provided in the. Further, a sheet 28 is provided on the turntable 23, a second turntable 29 is slidably disposed above the sheet 28, and a ring 30 is provided below the second turntable 29. These relationships are as described in the first and second embodiments. In addition, the rings 24 and 30 include
The same number of holes for detecting the rotational speed as in FIG. 2 are provided on the entire circumference.

Detector 3 for detecting holes in ring 24
2, a detector 34 is provided to detect holes in the ring 30. The detector 32 is the first turntable 2
3, the detector 34 detects the rotation speed of the second turntable 29. Then, the output of the detector 32 enters the reference signal generator 33 and is waveform-shaped. Similarly, the output of the detector 34 also enters the rotational speed detector 35 and is waveform-shaped. Then, each output is input to the speed comparison device 19. The subsequent configuration and signal flow are the same as those in the first embodiment, and the description thereof will be omitted.

The operation of the third embodiment configured as described above will be described below. The rotation speed of the first turntable 23 detected by the detector 32 is the motor 2
Since it is directly driven by the drive No. 2, this is the reference. The rotation speed of the second turntable 29 is the same as the rotation speed of the first turntable 23 because the drive is normally transmitted from the first turntable 23 via the seat 28. At this time, the period T4 of the pulse waveform of the output from the reference signal generator 33 output by detecting the rotation speed of the first turntable 23 is the rotation output by detecting the rotation speed of the second turntable 29. It is the same as the period T5 of the pulse waveform of the output from the speed detector 35. This state is shown in FIG. 3 described in the first embodiment.
Is the same as (a). The operation of touching and controlling the second turntable 29 in order to change the rhythm pitch and timing of the music being played back is the same as in the second embodiment.

Here, by using the first turntable 23 as the reference cycle T4, the influence of the rotational unevenness component of the motor 22 and the fluctuation of the rotational speed due to the passage of time (generally called a drift). This prevents the rhythm pitch of the music that is normally played from changing. That is, it is possible to cancel the uneven rotation and the fluctuation of the rotational speed as described above. Then, by rotating the second turntable 29 faster or slower by hand, it is possible to change the rhythm pitch and the timing of the music being reproduced, so that more accurate control becomes possible.

(Fourth Embodiment) Next, FIG. 11 is a block diagram of an information reproducing apparatus according to the fourth embodiment. The difference from the first embodiment is that in order to detect the rotation speed of the turntable 23, a first detector 25a and a second detector 25b are provided in the output control signal generator 38, and these outputs are output. The points are input to the first rotation speed detection unit 26 and the second rotation speed detection unit 36, the respective outputs are input to the phase detection device 37, and the outputs are further input to the CPU system control 14. Is. As shown in FIG. 11, the first and second detectors 25a and 25b are installed at predetermined intervals.

The operation of the fourth embodiment will be described below. Now, let us say that the output from the first rotation speed detection unit 26 is channel 1 and the output from the second rotation speed detection unit 36 is channel 2. If the song is playing normally,
As described above, the turntable 23 rotates at a steady speed. The outputs of channel 1 and channel 2 at this time are shown in FIG. The periods of channel 1 and channel 2 detect the hole 24a of the same ring 24, and therefore they are exactly the same at T6. However, since the first detector 25a and the second detector 25b are separated by a predetermined interval, channel 2 is delayed by time ΔT7 from channel 1 depending on the position.

In this state, that is, in the phase detector 37, it is detected that the channel 2 is behind the channel 1, and this information is sent to the CPU system controller 14.
Send to Then, in the CPU system control 14, at this time, control is performed so as to reproduce in a normal performance state.

Next, when it is desired to return the music being reproduced a little, the turntable 23 is manually rotated in the direction opposite to the normal rotation direction. Then, the output states of channel 1 and channel 2 are as shown in FIG. 12B, and this time channel 1 is delayed by time ΔT7. The phase detector 3 indicates that the channel 1 is delayed as compared with the channel 2.
7 and sends this information to the CPU system control 14. Then, CPU system control 14
In the above, the music being reproduced is controlled so that its reproduction position is returned to the reverse. Therefore, by rotating the turntable 23 in the opposite direction to the normal one, it is possible to rewind the music being played. That is, in the usual case, it was necessary to press a key (rewind key) to reverse the music in order to set the timing of the music, but it can be easily performed by rotating the turntable 23 in the opposite direction. Further, since the rhythm pitch and the timing can be changed by increasing or decreasing the rotation speed of the turntable 23, the operability is greatly improved.

Also, these two detectors and the phase detector 3
In the seventh embodiment, similar effects can be obtained in each of the second and third embodiments by only adding a configuration.

Since the phase relationship between channel 1 and channel 2 changes depending on the distance between the first detector 25a and the second detector 25b, the case of normal performance may be the opposite of that of the fourth embodiment. However, it goes without saying that the effects are exactly the same.

If the spindle motor 1 is configured to rotate in the opposite direction to the normal one, the information on the disk 2 can be read in the opposite manner to the normal one by rotating the turntable 23 in the opposite direction. That is, reverse reproduction is possible.

[0050]

As described above, according to the information reproducing apparatus of the present invention, the variable speed reading means for reading information from the recording medium on which a plurality of information blocks are recorded, and the output means for outputting the read information. A comparison means for comparing the detection signal output from the detection means with a predetermined reference signal, and a detection means for detecting the rotation speed of a rotating body provided separately from the system operation control means and the variable speed reading means. Since the variable speed reading means can determine the speed at which the variable speed reading means reads information from the recording medium based on the information output from the comparison means, it is possible to control the rotation speed of the rotating body from the information block. The read speed of can be changed. That is, there is an advantageous effect that the rhythm pitch and timing of the output information can be easily changed.

By using the device of the present invention, the rhythm pitch and timing of the information block of the second information reproducing device that follows can be matched with the information block of the first information reproducing device, and two devices of this device can be used. For example, it is possible to continuously perform the operation of matching the rhythm pitch and timing of a song to be reproduced later with that of the previous song.

[Brief description of drawings]

FIG. 1 is a block diagram of an information reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a rotary body and a side view of a ring according to the first embodiment.

FIG. 3 is an output waveform diagram of the rotation speed detection unit according to the first embodiment.

FIG. 4 is an explanatory diagram of an output pitch according to the first embodiment.

FIG. 5 is an explanatory diagram of output timing according to the first embodiment.

FIG. 6 is an explanatory diagram of output timing according to the first embodiment.

FIG. 7 is a sectional view of a rotating body according to the second embodiment.

FIG. 8 is a block diagram of an information reproducing apparatus according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a rotating body according to the third embodiment as well.

FIG. 10 is a top view of a rotating body according to the third embodiment as well.

FIG. 11 is a block diagram of an information reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 12 is an explanatory diagram of a phase of an output waveform according to the fourth embodiment.

FIG. 13 is a block diagram of a compact disc player which is a conventional information reproducing apparatus.

FIG. 14 is a block diagram of a conventional continuous output system for a compact disc player.

[Explanation of symbols]

 1 Spindle Motor 2 Disk 3 Optical Pickup 14 CPU System Control 15 Servo Signal Processing 18 Digital Signal Processing Block 19 Speed Comparison Device 20, 33 Reference Signal Generation Unit 21, 31, 38 Output Control Signal Generation Device 22 Motor 23, 29 Turntable 24 , 30 ring 24a hole 25, 25a, 25b, 32, 34 detector 26, 35, 36 rotational speed detection unit 27 power supply 28 sheet 37 phase detection device

Claims (6)

[Claims] 1. A variable speed reading means for reading information from a recording medium having a plurality of information blocks recorded thereon, an output means for outputting the read information, a control means for system operation, and the variable speed reading means. Detecting means for separately detecting the rotation speed of the rotating body, and a comparing means for comparing the detection signal output from the detecting means and a predetermined reference signal, by the information output from the comparing means, the An information reproducing apparatus characterized in that a variable speed reading means determines a speed at which information is read from a recording medium. 2. The information reproducing apparatus according to claim 1, wherein the rotating body is a turntable provided on a rotating shaft, and the detecting means detects a rotation speed of the turntable. 3. The rotating body is a second turntable slidably arranged on a first turntable provided on a rotating shaft, and the detecting means detects a rotation speed of the second turntable. The information reproducing apparatus according to claim 1, wherein the information reproducing apparatus is a device. 4. A variable speed reading means for reading information from a recording medium on which a plurality of information blocks are recorded, an output means for outputting the read information, a control means for system operation, and the variable speed reading means. First detection means for detecting the rotation speed of a first turntable provided on a rotation shaft of a separately provided rotating body, and a second detection means slidably provided on the first turntable. The second detection means for detecting the rotation speed of the turntable and the comparison means for comparing the output from the first detection means with the output from the second detection means are provided, and the comparison means outputs the output. An information reproducing apparatus characterized in that a speed of reading information from a recording medium is determined by the information. 5. A detector comprising: two detectors separated by a predetermined distance for detecting the rotational speed of the rotating body; and phase detecting means for detecting the rotation direction of the rotating body based on output information from the two detecting means, The information reproducing apparatus according to any one of claims 1 to 4, wherein it is determined whether or not to return the reproducing position to the reverse, based on the information output from the phase detecting means. 6. The information reproducing apparatus according to claim 1, wherein the rotating body has a rotational speed that can be arbitrarily changed.