JPH0553034B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a digital audio disc playback method.

BACKGROUND TECHNOLOGY A digital audio disk player (hereinafter referred to as
A player (abbreviated as "player") generally adopts a system in which all of a plurality of recorded songs are sequentially played back in the order in which they were recorded, or only a designated song is played back.

When playing songs recorded on a digital audio disk using a player that uses such a conventional playback method and re-recording them on a magnetic tape,
The time required to play all recorded songs does not necessarily match the recordable time of the tape, so
When a song recorded on a tape is played back by re-recording, the song may disappear at the end of the tape, or a long silent period may occur, causing discomfort. Therefore, the user must check in advance the songs that can be recorded based on the length of the tape and the performance time of each recorded song, and then specify the playback operation of only the songs that can be recorded, which requires complicated operations. There was a problem.

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 of the present invention includes means for reading time information of all of a plurality of pieces of information, and a time detection unit that detects the total playback time required for playing all of the pieces of information based on the read time information. means for determining whether or not the total playback time is greater than the specified time; and determining means for generating a re-detection command if the total playback time is greater than the specified time; and if the total playback time is smaller than the specified time; A first reproduction command means for instructing the sequential reproduction of all the plurality of information pieces, and detecting a group of information pieces whose cumulative reproduction time is smaller than the specified time based on the read time information in response to the re-detection command. an information piece detection means; a second reproduction command means for instructing sequential reproduction of only the information pieces detected by the information piece detection means; The present invention is characterized by comprising means for generating a re-detection command using the resulting time as a new designated time, and reproducing means for performing a reproducing operation in accordance with each command from the first and second reproducing command means.

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

In FIG. 1, reference numeral 1 denotes a player section for reproducing recorded information on a digital audio disk. In the player section 1, a spindle motor 3
Digital audio rotary driven by
Recorded information on the disk 2 is read by an optical pickup 4. This pick-up 4 includes a laser diode, an objective lens, a focus actuator, a tracking actuator, and a photodetector. 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.The focus servo circuit 5 generates a focus error, and the amount of this error is The focus actuator in the pickup is driven accordingly. The tracking servo circuit 6 generates a tracking error, and this error component is sent to the tracking actuator in the pickup and the pickup feed servo circuit 7. This pick-up feed servo circuit 7
The output of the pickup sends the pickup 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, read out in response to a constant cycle clock signal from the clock generation circuit 13, and converted into an analog signal by the D/A (digital/analog) converter 14. The output of this D/A converter 14 is supplied to the deck section 21 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 controller 17, and during the song,
Various information such as song intervals, song numbers, audio notes, and performance times can be loaded.
This controller 17 is made up of one or more microcomputers, and in response to commands output from the system controller 19, it issues various commands to the pick-up feed servo circuit 7, spindle servo circuit 8, and D/A converter 14. It supplies and sends data indicating the recorded information and operating status of the disk 2 to the system controller 19. Note that 18 is a RAM (random access memory) that stores information from the controller 17.

The system controller 19 is the controller 1
Similar to 7, it is composed of a microcomputer, and inputs keys on the operating section 20 and controller 17.
According to the output data, commands and the like are supplied to the controller 17, the display 21, and the mechanism control circuit 23 of the deck section 22.

In the deck section 21, the audio signal output from the player section 1 passes through a recording amplifier 24, is biased in an oscillation circuit 25, and is simultaneously supplied to a recording head within a mechanism section 26.

System controller 19 in the above configuration
In the microcomputer that makes up the
A processor that operates according to a program stored in advance in a ROM (read-only memory) performs the following processing.

That is, when a re-recording start command is issued by a user's key operation on the operation unit 20 during execution of the main routine, the processor responds to key operations on the operation unit 20 subsequent to generation of this reproduction-record start command. Data indicating the length of the tape thus generated, that is, the recordable time Ti is taken in (S1 in FIG. 2). The processor then controls the controller 17
A command to reproduce the information in the lead-in area is sent to determine the performance times t ₁ , t ₂ , . Total performance time Tt, which is the time required to play all the data shown and the recorded songs
(S2, S3 in FIG. 2).
Next, the processor compares the total performance time Tt with the available recording time Ti (S4 in Figure 2), and determines the available recording time.
When the value of Ti is greater than the total performance time Tt, a command is issued to reproduce all songs recorded on disk 2 (S5 in FIG. 2). Next, the processor subtracts the total performance time Tt from the available recording time Ti (see Figure 2 S).
6). Next, the processor writes 1 to a predetermined location in the RAM as data indicating the number of songs n (S7 in FIG. 2). Furthermore, in step S4, the possible recording time Ti
If the value of is less than the total performance time Tt, the process of step S7 is immediately performed.

Next, the processor compares the total playing time t ₁ , t ₂ , ... tn of each song from the first song to the nth song with the recordable time Ti (S8 in Figure 2), and calculates the value of Tn. If it is less than Ti, 1 is added to the number of songs n, and the process of step S8 is performed again (S9 in FIG. 2).
When the value of Tn is greater than Ti, the processor
Subtract 1 from (S10 in Figure 2). Next, the processor sends data specifying each song from the first song to the nth song to the controller 17 of the player section 1 (S11 in FIG. 2). Next, the processor sends a command to start playing the specified song to the controller 17 of the player section 1, and simultaneously sends a start recording command to the control circuit 23 of the deck section 22 (S12 in FIG. 2). Next, the processor detects whether or not the player section 1 has finished playing the designated song, and sends an operation stop command to the controller 17 of the player section 1 and the control circuit 23 of the deck section 22 (S13 in FIG. 2). S14).

In the above embodiment, various commands are sent from the system controller 19 to the control circuit 23 of the deck section 22 to control the deck section 22, but the deck section 22 is not controlled by the system controller 19. It's okay. Furthermore, in the above embodiment, the combination of songs to be played is set such that the total performance time of each song selected from the first song on disk 2 is less than or equal to the available recording time Ti. , the total of each performance time is less than or equal to the available recording time Ti, and the available recording time
It is also possible to set the combination of songs to be played so as to be closest to Ti.

Effects of the Invention As detailed above, the digital audio disk reproducing apparatus according to the present invention reads time information indicating the reproducing time required for reproducing each of a plurality of information groups, and determines the reproducing time of each of the plurality of information groups. Regarding detection and calculation processing, it detects information groups that can be played within a pre-specified time, and sequentially plays back only the detected information groups, so it is possible to avoid songs that disappear at the end of the tape or for long periods of time. This makes it possible to automatically perform good re-recording without causing a long unrecorded band. In addition, if the specified time such as available recording time is recorded on the disk and is longer than the playback time of all information pieces, all the information pieces are played back in the recording order, and then any information piece that fits within the remaining time of the specified time is played back. Since the information is automatically selected and played back, it is possible to perform an automatic program selection of pieces of information that can be played at any specified time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a reproducing apparatus according to the present invention, and FIG. 2 is a flow diagram showing the operation of the apparatus shown in FIG.

Claims (1)

[Claims] 1. A digital audio disk playback device in which a plurality of information pieces and time information indicating the playback time required for playing each of the plurality of information pieces are recorded, wherein the time information of all the plurality of information pieces is recorded. a time detection means for detecting the total playback time required for the playback of all of the plurality of information pieces based on the read time information; and a time detection means for detecting whether the total playback time is greater than a specified time. determining means for determining and issuing a re-detection command if the total reproduction time is greater than the designated time; and determining means for issuing a re-detection command if the total reproduction time is smaller than the designated time, for instructing sequential reproduction of all of the plurality of information pieces. 1 reproduction command means, information piece detection means for detecting, based on read time information, a group of information pieces whose cumulative playback time is smaller than the designated time in response to the re-detection command; and information piece detection means for detecting the information pieces. a second reproduction command means for instructing the sequential reproduction of only a group of information pieces detected by the means; and a second reproduction command means for instructing the sequential reproduction of only the group of information pieces detected by the means; means for generating the re-detection command as a specified time;
and a reproducing means for performing a reproducing operation in accordance with each command of the second reproducing command means.