JPS6344386A - Reproducing device for recorded information - Google Patents

Abstract

PURPOSE:To generate a reproduced output signal without an idle time by writing data equivalent to the access time of program information and simultaneously transmitting said data through a buffer memory that is made readable. CONSTITUTION:Pieces of information picked up at a data processing speed corresponding to an accelerated read speed are sequentially read in a buffer memory 32A. Simultaneously said pieces of information are read and transmitted as a reproduced output signal at the data processing speed corresponding to a standard read speed. Consequently data corresponding to the difference between the accelerated read speed and the standard read speed is accumulated in the memory 32A. The accumulation amount is selected to a value equivalent to the access time required for accessing from one to another information among pieces of information recorded on an optical disk 2. Even if time when no recorded information is picked up while program information is sequentially accessed and read out of the disk 2, consecutively data can be read out of the memory 32A.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to a recorded information reproducing device, and is applicable to a recorded information reproducing device capable of variable speed reproduction, such as an audio optical disc player system. It is suitable.

B. Summary of the Invention The present invention provides a recorded information reproducing device that reads out data recorded on a recording medium in a preprogrammed order. By making it possible to send out the signal through the buffer memory, it is possible to easily generate a reproduced output signal with no blank time.

C. Conventional Technology Conventionally, for example, in an audio player system used in an FM broadcasting station, a magnetic tape containing material recorded for a program is edited in advance using an editing device, and when it is on air, the magnetic tape is A method is used in which audio recorded information edited on a magnetic tape is sequentially played back from the beginning using a playback device. In this way, even if you try to broadcast audio information by changing the order of music information, deleting it, or repeating it, for example, blank time where no information is created at the joint position of the audio information can be avoided. Programs can be broadcast without any interruptions.

D Problems to be Solved by the Invention However, according to this method, in the editing work for rearranging audio information recorded sequentially in the longitudinal direction of a magnetic tape, such as replacing, deleting, or repeating, each There is a problem in that finding the cue of audio information and processing it requires considerable time and effort.

A method to solve this problem is to use a writable optical disc as a recording medium, and take advantage of the fact that the disc can be accessed randomly during playback, so that the audio information used for the program can be recorded without predetermining the order in which it will be recorded. A method has been devised to create a program that can be broadcast on air without the complicated editing work required in the past, by programming the order in which the programs are read out during playback.

When trying to play audio information using such a system, the time required for the access operation (this is called access time) is required when sequentially accessing the audio information to be played sequentially according to the program. During the access time, no reproduction signal is obtained, so there is a risk that a blank time without sound will occur.

The present invention has been made in consideration of the above points, and attempts to propose a recorded information reproducing device that prevents blank periods without sound from occurring when audio information is reproduced from a recording medium according to a predetermined program. That is.

E Means for Solving Problems In order to solve these problems, in the present invention, program information P1, P2, P3, . . . recorded on the recording medium 2 is provided.
The program information P picked up from the recording medium 2 in a recorded information reproducing apparatus that is configured to sequentially access and pick up ... at a standard reading speed SPMO or an accelerated reading speed 5PAc in a preprogrammed order.
1, P2, P3, . . . are buffer memory 32 having a memory capacity corresponding to the time required for the access operation.
A is written at a data processing speed corresponding to the accelerated reading speed, and read at a data processing speed corresponding to the standard reading speed, and when a predetermined amount of data is held in the buffer memory 32A, the writing speed of the buffer memory 32A is The standard reading speed SPN. By switching to the data processing speed corresponding to the data processing speed, the reproduced program information P1, P2,
A reproduction output signal with no blank time between P3... is sent out.

The F-action buffer memory 32A stores program information P1 picked up at a data processing speed corresponding to the accelerated reading speed.
, P2, P3... are written sequentially, and
At the same time, the data is read out at a data processing speed corresponding to the standard reading speed and sent out as a reproduction output signal.

Therefore, data corresponding to the difference between the accelerated reading speed and the standard reading speed is accumulated in the buffer memory 32A. The value is selected to correspond to the access time required to access one.

Therefore, when reading program information sequentially from the recording medium 2, even if there is a time when recorded information is not picked up at the time of access, data can be continuously read from the buffer memory 32A, so that there is a blank space between the reproduced program information. Reproduction output signal P without time
RO can be easily obtained.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a recorded information reproducing apparatus as a whole, which has an optical disk 2 as a recording medium, and audio information, which is the material of a program, is recorded with an address attached to a recording track formed in a spiral shape. (This is called program information), and each program information can be reproduced by accessing it randomly using the optical pickup 3.

The optical disc 2 is driven at a constant linear velocity (CL V ) by a spindle motor 5 that is driven and controlled by a spindle drive signal 33D sent from a servo circuit 4, so that the optical pickup 3 can read program information at a constant linear velocity. controlled.

Pickup signal I)r obtained from optical pickup 3
u is processed in the pickup signal processing circuit 11, and sends out a reproduction signal D2 made of an RF signal including program information to the demodulation/decoding circuit 12, and sends out a slide error signal SSt to the slide servo circuit 13, and also sends out a slide error signal SSt to the slide servo circuit 13, and detects a focus tracking error. A signal S20 is given to the focus tracking servo circuit 14.

The slide error signal SSt represents the slide error amount of the optical pickup 3 for the sector on the optical disk 2, and the slide servo circuit 13 picks up the slide motor drive signals S and D such that the slide error signal Sat becomes O. By supplying the light to the slide motor 15, the optical pickup 3 is controlled to slide in the radial direction so as to follow a predetermined sector on a spirally formed recording track.

The focus tracking error signal SFE represents the deviation from the standard value of the aperture of the light emitted from the optical pickup 3 onto the optical disk 2 and the positional deviation of the emitted light in the radial direction with respect to the recording track. The circuit 14 sends out a focus tracking drive signal SFD to the optical pickup 3 so as to set the focus tracking error signal SFE to O.

In this way, the optical pickup 3 is controlled so that the program information can be read under optimal conditions by tracking the irradiated light of a predetermined diameter onto the spirally formed track.

The demodulation/decoding circuit 12 generates a reproduced signal DPL consisting of an RF signal.
The demodulated and decoded audio data DAB are outputted to the digital/analog conversion circuit 16 via the output processing circuit 15, and thus the program output PRO consisting of an analog signal is sent out as a reproduction output signal of the recorded information reproduction apparatus l.

Furthermore, the demodulation/decoding circuit 12 selects among the reproduced signals DPL.
CL the RF friend signal SAY and time code data D7.4 attached to the audio data DAI, respectively.
It is supplied to the V servo circuit 4 and the system controller 22.

The RF synchronization signal SSV represents the linear velocity of the recording track currently tracked by the optical pickup 3, and
The LV servo circuit 4 receives this RF friend signal S. A spindle drive signal ssn that makes the period of the optical pickup 3 constant is supplied to the spindle motor 5.
The linear velocity of the recording track being tracked by is controlled to a predetermined constant value.

Here, the CLV servo circuit 4 uses a variable reference clock signal C
L, and when the cycle is the standard cycle, the optical disc 2 is read at the standard reading speed SP. In contrast, during the acceleration period, the optical disk 2 is rotated at an accelerated reading speed of 5PAC, which is accelerated by, for example, 10% with respect to the standard reading speed of 5PNO.

The system controller 22 is configured by a microcomputer, and programs the playback order of a large number of program information recorded on the optical disc 2 based on the operation command information COM inputted from the keyboard 23, and stores it in an internal memory. The slide servo circuit 13 and the focus tracking servo circuit 1 respectively send a slide control signal SSC and a focus tracking control signal SFe that designate sectors in which corresponding program information is recorded sequentially and continuously according to the program during playback.
Give to 4. In this way, the optical pickup 3 sequentially accesses the sectors in which the programmed program information is recorded, reproduces the current program information for the required length, and then reproduces the program 1'f? The optical pickup 3 is made to access the sector in which the information is recorded.

In addition to the above configuration, after the optical pickup 3 picks up program information from one sector and until it accesses the next sector, it is used as a program output PRO to prevent blank time without audio information from occurring. , the output processing circuit 15 is configured as described below.

Under the control of the system controller 22, the output processing circuit 15 controls the timing at which program information is sequentially picked up and taken in from the optical disk 2, and the timing at which it is output, so that the optical pickup 3 can transfer program information from one sector to another. During the access time (for example, it requires about 1 [excerpt]), the audio data that has been read in advance is output internally, so that there is no blank time where there is no audio information. It is made to be.

That is, the output processing circuit 15 has a buffer memory circuit 32 consisting of buffer memories 32A and 32B that temporarily stores the audio data DAf1 sent from the demodulation/decoding circuit 12, and writes or reads data to each buffer memory 32A and 32B. The buffer controller 3
3, the write/read control signals S we+ and s
Controlled by mcz.

Here, when the stored audio data DAD is read out at a data processing speed corresponding to a standard reading speed of 5PNO, the buffer memories 32A and 32B have a readout time of the access time of the optical pickup 3 (i.e., about 1 second). The memory capacity is selected such that the audio data DAD can be read out without interruption.

The audio data DA and Daoz read from the buffer memories 32A and 32B are sent to the digital/analog conversion circuit 16 via the switching circuit 34 which is switched and controlled by the switching control signal SeH of the system controller 22.

In particular, the first buffer memory 32A writes the audio data DAD at the data processing speed corresponding to the accelerated reading speed 5PAc while writing the audio data DAD at the standard reading speed SP, while the data storage amount is not full. Audio data D, accumulated at a data processing rate corresponding to . is controlled by the system controller 22 to read out. Therefore, at this time, the audio data DAD is accumulated in the first buffer memory 32A at a speed corresponding to the difference in writing speed.

Eventually, when the storage amount becomes full, the writing speed of the first buffer memory 32A is switched to the data processing speed corresponding to the standard reading speed 5PH0, and thus the storage amount of audio data DAI remains constant thereafter. controlled as follows.

On the other hand, the second buffer memory 32B is controlled so as to read out the audio data DAD written in advance at the time of preview at a successive reading speed corresponding to the standard reading speed 5PNO as necessary.

The output processing circuit 15 has a master clock generation circuit 35, which generates a variable reference clock signal CL whose clock period changes from standard period reading to acceleration period 3t and +1 reading according to a master clock control signal SMC given from the system controller 22. and C.L.

occurs. The variable reference clock signal CL is given to the CL servo circuit 4 as a speed reference signal, and thereby the system controller 22 drives the spindle motor 5 to vary the optical disc 2 from the standard reading speed 5PNO to the accelerated reading speed 5PAC. Can be controlled.

Correspondingly, variable reference clock signal CLz is provided to demodulation/decoding circuit 12 and buffer controller 33. Thus, when the optical disc 2 changes from the standard reading speed SP to the accelerated reading speed 5PAC, the system controller 22 operates the demodulation/decoding circuit 12 at a data processing speed corresponding to the data transfer speed of the reproduction signal DPL. The audio data D0 is decoded.

At the same time, the system controller 22 causes the buffer controller 33 to send out the write/read control signals 5IICI and SRe□, which change in accordance with changes in the period of the variable reference clock signal CLz, thereby converting the audio data DAD into the conversion. Data is written into the buffer memories 32A and 32B at corresponding data processing speeds.

The master clock generation circuit 35 also operates at a standard reading speed SP.
, , is applied to the buffer controller 33 and the digital/analog conversion circuit 16, and thereby the system controller 22 is configured to provide the buffer controller 33 with the audio data stored in the buffer memory 32A or 32B. The data DAI is read out at a data processing speed corresponding to the standard reading speed SP of 4 degrees, and the digital/analog conversion circuit 16 converts it into an analog signal and outputs the program.
It is controlled so that it is output as O.

In the above configuration, the operator previews the program information on the optical disc 2 to confirm the audio information that is the program material, and also programs the playback order using the keyboard 23.

At that time, assuming that the program signals are played back in the order desired for programming, it is checked whether or not a blank time without an audio signal occurs while the optical pickup 3 is being accessed, and the blank time is checked. When this is confirmed, program information to be reproduced during the blank time is read in advance and stored in the second buffer memory 32B.

In fact, whether or not a blank time will occur can be determined based on the information it (the amount of information is represented by the time of the audio signal) of each programmed program information, and the operator can check the blank time at the time of preview. The audio information to be checked and accessed next by the optical pickup 3 is read in advance by the access time (ie, 1 second) and is written in the buffer memory 32B in advance.

In this embodiment, for example, as shown in FIG.
Second, third, etc. program information PI, P2,
When a program is set in the internal memory of the system controller 22 to sequentially reproduce P3..., the optical pickup 3 plays the third program information P3 from the sector in which the second program information iP2 is recorded. Since it was possible to check that the stored data in the buffer memory 32A becomes empty when accessing the sector in which the data is recorded, the program information of the sector, that is, the third The program information P3 of the access time (i.e. 1
[seconds]) are read in advance into the buffer memory 32B.

In addition, in the case of this embodiment, at the start of program playback, data of the first program information P1 is transferred from the buffer memory 32A without waiting for a time (in order to be able to read data immediately). Quantitatively, for example, one track is read in advance and written into the buffer memory 32A.

Thus, for example, when the operator uses the keyboard 23 to instruct the system controller 22 to start program playback at the time when on-air starts, the system controller 22 will continuously play the programmed audio according to the program information set at the time of preview. To continue playing program output PRO without interruption.

That is, at time t0 in FIG. 2(A), the operator uses the keyboard 23 to select the system controller 22.
command to start program playback.

At this time, as shown in FIG. 2(B), the system controller 22 rotates the optical disc 2 at an accelerated reading speed of 5PAC, which is 10% faster than the standard reading speed of 5PNO, and reads the pickup signal DP obtained from the optical pickup 3.
The audio data DAD based on U is stored in the buffer memory 3.
Write data D++3zA+ for 2A (Fig. 2 (E
)).

However, at this time, the system controller 22 reads the stored data from the buffer memory 32A at a successive reading speed corresponding to the standard reading speed of 5PNO, and reads the stored data as successive data D. (0A
) (FIG. 2(F)) from the switching circuit 34.

Thus, the write data D I +2 written to the buffer memory 32A! A) write speed is read data Dot
Since it is 10% faster than the successive output speed of 3z□, the data storage amount ACC of the buffer memory 32A is as shown in Fig. 2 (C).
It gradually increases as shown in .

In the case of this embodiment, the buffer memory 32A has a memory capacity capable of storing one second of audio data I)in, and the system controller 22 stores the write data DI until the memory capacity reaches its allowable limit (i.e., is full). (3!4
).

The write data D I (ff!A) (FIG. 2 (E)) written in the buffer memory 32A in this way is as follows:
As the data accumulation IAcc (Fig. 2 (C)) in the buffer memory 32A increases, successive data Do+*zA
The time until it is read out as + (FIG. 2 (F)) gradually becomes delayed.

In this way, the first program information PL is processed at the data processing speed corresponding to the accelerated reading speed 5PAC and is gradually stored in the buffer memory 32A at the standard reading speed SP. A state is obtained in which the data is read out at a successive output speed corresponding to . In this state, time 1 is reached. When the amount of data stored in the buffer memo U 32 A reaches a "full" detection level near the allowable limit, the buffer controller 33 detects this and sends a full detection signal SRF to the system controller 22.

At this time, the system controller 22 controls the optical disk 2.
Accelerate the rotation speed from reading speed 5 PAC to standard reading speed S P N. In this way, the write data D++sza+ (Fig. 2(
E)) The data processing speed of the audio data DAD to be written is decreased.

Thus, at time t2, when the rotational speed of the optical disk 2 reaches the standard reading speed 5PNO (FIG. 2(B)), the writing speed of the write data DI (04) of the buffer memory 32A and the successive data D. . ff1A), the data storage lid of the buffer memory 32A becomes a predetermined amount (that is, data for one second of audio signal), and while this data amount is held in the buffer memory 32A, the first The program data P1 is set to the standard reading speed SP.

The program output PRO is sent at a data processing speed corresponding to the program output PRO.

Eventually, at time t, when the optical pickup 3 completes picking up the first program data, the system controller 22 recognizes this based on the time code signal DTH given from the demodulation/decoding circuit 12, and the optical pickup 3 starts picking up the data. The operation is interrupted and access is made from the sector where the first program information Pi is recorded to the sector where the second program information P2 is recorded.

In this way, the recorded information reproducing HE device 1 accesses MA in FIG.
Enter time T2. At this time, system controller 2
2 continues reading out the stored data Do<2□) (FIG. 2(B)) in the buffer memory 32A at a speed corresponding to the standard speed 5PNO. However, at this time, the optical pickup 3 is in a state in which it does not read recorded information, so the data accumulation 1iAcc in the buffer memory 32A gradually decreases (FIG. 2<C>>).

Eventually, at time t4, when the optical pickup 3 completes accessing the sector in which the second program information P2 is recorded, the system controller 22 starts reading the second program information P2 from the sector, and reads this program information P2. is written into the buffer memory 32A as write data DIL3zA (FIG. 2(E)).

Thus, the access period T2 ends and the second data reproduction period T3 begins at time t4, but more first program information P1 than the audio data corresponding to the time (1 second) required for the access period T2 is stored in the buffer memory 32.
Since the first program information P1 is held in the read data D even during the access period T2. . 2□ (FIG. 2 (F)), the program output PRO is already buffered by the time reading of the first program information P1 is completed without creating a blank time where there is no audio signal. The first program information iP1 that has started to be written into the memory 32A can be read out.

In this way, when the second data reproduction period T3 starts at time t, the amount of accumulated data in the buffer memory 32A is due to the fact that data is read at the standard speed without being written during the access period T2. , only a considerably smaller amount of data remains compared to the data when it is full.

When reading the second program information P2 at time t4, the system controller 22 gradually accelerates the speed of the optical disc 2 from the standard reading speed 5Pso (FIG. 2 (B)) to the accelerated reading speed 5Pac from time t. The recorded information reproducing device 1 is controlled to be driven at a data rate corresponding to an accelerated reading rate of 5 PAc.

Thus, the buffer memory 3 of the second program information P2
As the writing speed to 2A increases after time t4,
Data storage amount ACC of buffer memory 32A (Fig. 2 (
C)) will gradually rise.

In this way, until the reading of the second program information P2 is completed at time t, the accelerated reading speed is increased to 5PA.
At the same time, the write data D I +31Al is written to the buffer memory 32A at a data processing speed corresponding to C. At the same time, the read data D. . 2A is sent out without interruption as the program output PRO.

In this embodiment, the amount of data of the second program information P2 is quite small! (for example, 10 (seconds) or less), therefore, the reading of the second program information P2 is completed at time t7 before the data storage 11Acc of the buffer memory 32A reaches full capacity, and the optical pickup 3 is An access period T4 starts from the sector in which the second program information iP2 is recorded to the sector in which the third program information P3 is recorded.

Therefore, at this point, the system controller 22 interrupts the pickup operation of the optical pickup 3, and then continues to read out the second program information P2 remaining in the buffer memory 32A at a data processing speed corresponding to the standard reading speed 5PNO.

Here, the data accumulation amount ACC of the second program data P2 remaining in the buffer memory 32A is smaller than the amount corresponding to one access time of the optical pickup 3, so the data storage amount ACC of the second program data P2 remaining in the buffer memory 32A is smaller than the amount corresponding to one access time of the optical pickup 3. Data accumulation IA in the buffer memory 32A at time t.
cc becomes O (Fig. 2 (C)).

The system controller 22 recognizes this based on the empty detection signal Sty given from the buffer controller 33, and transfers the third program information P3 for l [seconds] stored in the second buffer memory 32B at the preview time. Read data D. . 2□ (FIG. 2(F)), the switching circuit 34 is switched to the buffer memory 32B side, and the program output PR○ is sent out.

Thus, during the access period T4 between time t and L9, while the writing of data from the optical pickup 3 is interrupted, the remaining part of the second program information P2 is read out from the buffer memory 32A, and then the writing continues. Third
Of the program information P3 of , data corresponding to θ~1 [seconds] is read out from the buffer memory 32B and is stored in the row (
.

Eventually, at time t, when the optical pickup 3 completes accessing the sector in which data of the third program information P3 is recorded one [second] later, the data of the third program information P3 is recorded.
3rd to pick up program information P3 after [seconds]
The data reproduction period T5 begins.

At this time, the system controller 22 waits for the third program information P3 of 0-1 (seconds) to be read out completely from the second buffer memory 32B at time t, and
When the time point reaches 1°, the switching circuit 34 is switched to the buffer memory 32A side, and the third program information iP3 1 [second] after the start of writing from the time point t is read out and sent out as the program output PRO. I'll go.

Thus, at the point [,~t,. During the period, accelerated reading speed 5PA
the first buffer memory 3 at a data processing speed corresponding to c.
While the third program information P3 after 1 [second] is written to 2A, no data is read from the buffer memory 32A, so the data storage amount ACC of the buffer memory 32A rapidly increases. Then, at time t,. When reading from the buffer memory 32A is started, the data storage amount ACC of the buffer memory 32A increases to a full state in the same manner as described above for time points t6 to t.

On the other hand, as shown in FIG. 2(D), the data in the second buffer memory 32B is stored at time 1. ~t. According to the above configuration, the optical pickup 3 can access the buffer memory 32A from the sector in which one program information is recorded to the sector in which the next program information is recorded. By retaining the data of the data storage amount Acc corresponding to the access time required for the program and reading it out and sending it out as the program output PRO, the optical pickup 3 can When accessing the sector in which the next program information is recorded, it is possible to effectively avoid the possibility of creating a blank period in which no audio signal is present.

Thus, in addition to the first buffer memory 32A,
By providing the second buffer memory 32B, even when program information is sequentially programmed such that data corresponding to one access time cannot be stored in the buffer memory 32A, the second buffer memory 32B can be used. By using 32B of accumulated data, blank time can be avoided. In this way, the first buffer memory 32A has a simple configuration that only requires a memory capacity corresponding to one access time.

As in the case of the embodiment of FIG. 1, the standard reading speed is 5P.
Accelerated reading speed 5PAC increased by 10% compared to NO
When the buffer memory 32A has a memory capacity for one access time (i.e., 1 [second]) while rotating the optical disk 2, one program information must be read at an accelerated rate for at least 10 [seconds]. For example, it is possible to hold enough data to read data without interruption from the buffer memory 32A during the access time required for one access by the optical pickup 3, and as a result, in almost all practical cases, the blank time can be reduced. It is possible to send out a program output PRO that does not exist.

In reality, the minimum length of program information (for example, a short commercial) is about 15 seconds, so data for one access time can always be stored in the buffer memory 32A. . Therefore, in practice, in most cases, the recorded information reproducing device 1 is used at time t to t4 in FIG.
By remanipulating the operations of the first data reproduction period TI and access period T2 described above, it is possible to obtain a program output PRO without any blank time.

Note that in the above embodiment, the first buffer memory 32
Although we have described the case where the second buffer memory 32B is provided in addition to A, if the memory capacity of the first buffer memory 32A is increased, the second buffer memory 32B can be omitted. If a memory capacity of 32A is selected that can store about 20 seconds of data, even if a short program material continues at the start of program playback, the required amount will be stored in the buffer memory 32A before program playback starts. By being able to store data, it is possible to send out a program output PRO with no blank time, even without actually providing the second buffer memory 32B.

Further, in the above-described embodiment, a case has been described in which the present invention is applied to a recorded information reproducing apparatus using an optical disc as a recording medium, but the present invention is not limited to this, and the present invention is applicable to a recording medium having a relatively short access time by a pickup. It can be widely applied to recorded information reproducing devices.

H Effects of the Invention As described above, according to the present invention, program information can be written into the buffer memory that can store data corresponding to the access time of the pickup, and the playback output signal can be sent out while being simultaneously read out. It is possible to easily realize a recorded information reproducing apparatus with simple operation that can effectively avoid the possibility of blank time occurring in the reproduced output signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a recorded information reproducing apparatus according to the present invention, and FIG. 2 is a signal waveform diagram for explaining its operation. 1... Recorded information reproducing device, 2... Optical disc, 3... Optical pickup, 5...
・Spindle motor, 12...Demodulation/decoding circuit, 15...Output processing circuit, 16...
Digital/analog conversion circuit, 22...System controller, 23...Keyboard, 32
...Buffer memory circuit, 32A, 32B...
...Buffer memory, 33...Buffer controller, 34...Switching circuit, 35...
...Master clock generation circuit.

Claims (1)

[Scope of Claims] A recorded information reproducing device configured to sequentially access program information recorded on a recording medium in a preprogrammed order and pick up the program information at a standard reading speed or an accelerated reading speed, wherein the recording information is picked up from the recording medium. The program information is written to a buffer memory having a memory capacity corresponding to the time required for the access operation at a data processing speed corresponding to the accelerated reading speed, and read out at a data processing speed corresponding to the standard reading speed. When a predetermined amount of data is stored in the buffer memory, the writing speed of the buffer memory is switched to a data processing speed corresponding to the standard reading speed, thereby reducing the blank time between the reproduced program information. What is claimed is: 1. A recorded information reproducing device characterized in that it sends out a reproduction output signal that is free from noise.