JPH0325867B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a digital audio disk reproducing apparatus, and more particularly to an apparatus for reproducing recorded information on a digital audio disk called a compact disk.

Background technology A digital disk called a compact disk
As shown in FIG. 5, the recording area of the audio disk is divided into three areas from the inside: a lead-in area E1, a program area E2, and a lead-out area E3. The lead-in area E1 contains a TOC that includes data indicating the number of songs recorded, the address (position on the disk) of the beginning of a famous song, the playing time required to play the famous song, the total playing time, etc.
A data group called (Table Of Contents) is recorded. A program area E2 following this lead-in area E1 is an area where audio information is recorded. Further, the lead-out area E3 is an area in which a signal indicating the end of audio information is repeatedly recorded.

A player having a function called a random memory song selection function or a program song selection function has already been devised as a digital audio disk device (hereinafter referred to as a player) for playing back songs recorded on a digital audio disk as described above. . This player is configured to automatically play back only the songs of the input song numbers by sequentially inputting song numbers indicating desired songs by manual operation of a keyboard or the like. To prevent a song from disappearing during playback when playing back a song recorded on a digital audio disk and re-recording it onto a magnetic tape using such a conventional player. In order to do this, the user should check in advance the songs that can be recorded based on the length of the tape and the playing time of the recorded songs, and use the random memory song selection function to specify the songs to be played in advance so that only the songs that can be recorded will be played. Conventional devices have the drawback of requiring complicated operations.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital audio disc playback device that can automatically perform good rerecording without complicated operations.

The digital audio disk playback device according to the present invention stores playback commands for playing back each combination of information pieces that can be played within a specified time based on time information recorded on the disk in response to a programming command. It is configured to write to.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, recorded information on a digital audio disk 2 which is rotationally driven by a spindle motor 3 is read by an optical pickup 4. As shown in FIG. This pick-up 4 includes a laser diode, an objective lens, a focus actuator,
A tracking actuator and a photo detector are built in. The output of the pickup 4 is input to each of a focus servo circuit 5, a tracking servo circuit 6, and a phase comparison circuit 9 including an RF amplifier.
In this case, a focus error is generated, and a focus actuator in the pickup is driven according to the amount of the error. Tracking servo circuit 6
Then, a tracking error is generated, and this error component is sent to the tracking actuator in the pickup and the pickup feed servo circuit 7. The output of the pick-up feed servo circuit 7 causes the pick-up 4 to be fed in the radial direction of the disk 2.

The phase difference between the reproduction clock signal obtained by the phase comparison circuit 9 and the reference clock signal from the clock generation circuit 13 is detected in the spindle servo circuit 8, and the spindle motor 3 is controlled so that the track linear velocity of the recording disk 2 is constant. is driven.
The output of the phase comparison circuit 9 includes a frame synchronization circuit.
The signal is supplied to an EFM (Eight to Fourteen Modulation) demodulation circuit 10, and the demodulated output is processed by a data processing circuit 11 that performs deinterleaving, error detection, correction, correction, etc. of the demodulated data signal. Thereafter, the data is temporarily stored in the data memory 12 and read out using a constant cycle clock signal from the clock generation circuit 13 as a D/A (digital/analog).
The converter 14 converts the signal into an analog signal. The output of this D/A converter 14 is supplied to an output terminal via an LPF (low pass filter) 16 as left and right audio signals.

On the other hand, the control signal in the data from the demodulation circuit 10 is supplied to the system controller 17,
Various information such as TOC in the lead-in area, during and between songs in the program area, song number, and current playing time can be read. The system controller 17 is composed of one or more microcomputers, and is configured to handle key inputs from the operating section 19 and RAM (random access memory).
Data is supplied to the display 20 according to the instruction code written in the program area 18, as well as the pick-up feed servo circuit 7 and the spindle servo circuit 8.
Provides various directives to the As shown in FIG. 2, the operating section 19 is provided with an edit key K1 for issuing programming commands and a numeric keypad K2 for specifying the playback operation time and the song to be played. In the microcomputer constituting the system controller 17 in the above configuration, a processor that operates according to a program stored in advance in a ROM (read-only memory) performs the following processing.

In other words, when an interrupt processing request signal is generated by a timer or the like during the main routine, the processor reads the TOC recorded in the lead-in area of disk 2 and reads the TOC.
It is determined whether writing to the RAM 18 is completed (S1 in FIG. 3). If it is found that writing of the TOC to the RAM 18 is not completed by executing step TS1, the processor executes the main routine again. Further, if it is found that writing of the TOC to the RAM 18 is completed by executing step S1, the processor determines whether a playback operation time has been specified and a program command has been issued ( Figure 3 S2). If it is found through execution of step S2 that one or both of the playback operation time specification and program command have not been made, the processor executes the main routine again. Also, step
If it is found by executing S2 that both a playback operation time specification and a program command have been made, the processor selects the number of the first song to be played, for example, on the numeric keypad K2 following the playback operation time specification. It is determined whether it is specified by the operation (S3 in Figure 3). If it is found by executing step S3 that the number of the first song has not been specified, the processor sets the first song number on disk 2 as the specified song number i (S4 in Figure 3), The specified song number i is written into the program area of the RAM 18 as an instruction code of a playback command that instructs playback of the song number i (FIG. 3, S5). If it is found by executing step S3 that the number of the first song has been input as designated song number i, the processor immediately executes the process of step S5.

Next, the processor determines whether the total playback time required to play back the song whose number is written as the command code of the playback command is longer than the specified playback operation time (S6 in FIG. 3). This step S6
If the total playback time is found to be longer than the specified playback operation time by executing , the processor erases the first instruction code written in the program area (S7 in Figure 3) and executes the main routine. Do it again. Furthermore, if it is found by executing step S6 that the total playback time is less than or equal to the specified playback operation time, the processor selects the specified song number i written in the program area as the first song on disk 2. Determine whether the number is equal to the number (third
Figure S8). If it is found by executing step S8 that the specified song number i is not equal to the song number of the first song on disk 2, the processor adds 1 to the specified song number i (S9 in FIG. 3), Processing from step S5 onward is performed. Further, if it is found by executing step S8 that the designated song number i is equal to the song number of the last song on the disk 2, the processor executes the main routine again.

Through the above processing, a program for sequentially reproducing each of the maximum number of information groups that can be reproduced within the specified reproduction operation time is automatically written in the program area of the RAM 18, making it easy to perform good re-recording. This can be done by simple operations.

FIG. 4 is a flow diagram showing another example of the operation of the apparatus shown in FIG. Steps S11 and
In S12, the same processing as steps S1 and S2 in FIG. 3 is performed, so steps from S13 onwards will be explained.

If it is detected that the playback operation time has been designated and a program command has been issued by executing step S12, the processor determines whether a program automatically programmed according to the same sequence is already stored in the program area. (Figure 4, S13). If it is found through the execution of step S13 that a program automatically programmed according to the same sequence is already stored in the program area, the processor writes the last instruction code of the stored program to disk 2. It is determined whether the song number of the last song among the recorded songs is stored (S14 in FIG. 4). This step
If it is found by executing S14 that the song number of the last song among the songs recorded on disk 2 is stored as the last instruction code of the program, the processor executes the main routine again. Furthermore, if it is found by executing step S14 that the song number of the last song of the songs recorded on disk 2 is not stored as the last instruction code of the program, the processor issues a command to stop the playback operation. A pause command to be executed is written to the address next to the last command of the already stored program (S15 in FIG. 4).
Next, the processor stores in a register or the like the music number next to the music number written as the last instruction code of the already stored program as the designated music number i (FIG. 4, S16). Next, the processor determines whether the designated song number i has been set (S17 in FIG. 4). Incidentally, if the program is not stored in the program area in step S13, the program immediately executes step S17. If it is found by executing step S17 that the specified song number i has not been set, the processor stores and holds the song number of the first song among the songs recorded on disk 2 in the register as the specified song number i. (S18 in FIG. 4), and writes the specified song number i as an instruction code into the program area (S19 in FIG. 4). step
If it is found through the execution of S17 that the designated music number i has been set, the processor immediately executes step S19.

Next, the processor determines whether the time required to execute all the newly written instructions in the program area is longer than the specified playback operation time (S20 in FIG. 4). If it is found by executing step S20 that the time required to execute all newly written instructions is longer than the specified playback operation time, the processor erases the last instruction written in the program area. (Figure 4 S21). Then,
The processor determines whether or not the last instruction written in the program area is a pause instruction (S22 in FIG. 4). This step
If it is found by executing S22 that the last instruction of the program newly stored in the program area is a pause instruction, the processor erases the pause instruction (S23 in Figure 4) and executes the main routine. Do it again. If it is determined by executing step S22 that the last instruction of the program newly stored in the program area is not a pause instruction, the processor immediately resumes execution of the main routine.

If it is determined by executing step S20 that the time required to execute all newly written instructions is less than or equal to the specified playback operation time, the processor executes the last written instruction code in the program area. It is determined whether the song number is the last song number of the songs recorded on disk 2 (Figure 4).
S24). If it is determined by executing step S24 that the last written song number is equal to the song number of the last song recorded on disk 2, the processor resumes execution of the main routine. step
If it is found by executing S24 that the last written song number is not equal to the song number of the last song recorded on disk 2, the processor writes the specified song number stored in the register. Add 1 to i (S25 in FIG. 4), and perform the processing of the intention in step S19.

As a result of the above processing, two programs that sequentially reproduce each of the maximum number of information groups that can be reproduced within the specified reproduction operation time are created with a pause command in between. A side, B
This means that re-recording on each of the two surfaces can be performed by a simple operation.

Effects of the Invention As detailed above, the digital audio disk reproducing apparatus according to the present invention can reproduce combinations of information pieces that can be reproduced within a specified time based on time information recorded on the disk in response to a programming command. Since the configuration is such that the playback instructions for playing each song are written into memory, a simple operation allows you to finish playing the songs recorded on the digital audio disk just before the remaining capacity of the tape reaches zero. They can be stopped at the same time, and good re-recording can be performed without any songs disappearing midway.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the operation panel of FIG. 1, and FIG. 3 is a flow diagram showing an example of the operation of the device shown in FIG. 1. FIG. 4 is a flowchart showing another example of the operation of the apparatus shown in FIG. 1, and FIG. 5 is a diagram showing a recording area of a digital audio disk.

Claims (1)

[Claims] 1. Out of the plurality of information pieces stored in the memory, recorded information of a digital audio disk in which a plurality of information pieces and time information indicating the playback time required to reproduce each of the plurality of information pieces are recorded. A digital audio disk playback device that plays according to information piece identification data indicating at least one of: time data indicating a time specified by manual operation and information piece specified by manual operation; data generating means for generating specified information piece identification data indicated by the specified information piece identification data; command generating means for generating a programming command by manual operation; When the plurality of information pieces are sequentially reproduced in a predetermined order, the maximum number of information pieces that can be reproduced within the time indicated by the time data is detected by the time information, and each of these maximum number of information pieces is detected. and means for writing into the memory a group of information piece identification data indicating the information piece.