JP3046815B2 - Optical disc playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus for reproducing music recorded on an optical disk such as a compact disk player. 2. Description of the Related Art Conventionally, when recording from a compact disk (CD) to a cassette tape, either a 46-minute tape or a 90-minute tape has to be used. It is desirable to record in the form of a CD, and in the case of recording a CD whose playing time is about 40 minutes, similarly to an LP record, a 46-minute tape is often used. [0003] When a 46-minute tape is used, the end of one side of the cassette tape may be reached in the middle of a CD song, and the direction of the cassette deck may be changed. Almost. In the one-way deck, the CD player is temporarily stopped at the end of the tape, the cassette is replaced on the opposite side, and then recording is started again from the beginning of the cut piece. For those who play and listen to the tape recorded in this way, it is uncomfortable because the song is cut off in the middle, and the operation of the CD player and cassette deck is very complicated, I can't leave. [0004] An optical disc reproducing apparatus according to the present invention has been made in view of the above points, and is a deciding means for automatically deciding a music to be reproduced based on an inputted time. When playing back a song recorded on the optical disc, if the time has been input, the song determined by the determining means is played, and if the time has not been entered, And control means for controlling the reproduction of the data. According to the optical disk reproducing apparatus of the present invention, in an optical disk reproducing apparatus for reproducing an optical disk on which a plurality of music pieces are recorded, a deciding means for automatically determining a music piece to be reproduced based on the input time. When playing a song recorded on the optical disc, if the time is input, the song determined by the determining means is played, and if the time is not input, the normal playback is performed. With such a control means, for example, even when recording, operations such as selection of a song are simplified, so that operability is improved. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment according to the present invention, in which a thick arrow indicates a flow of a main signal, and a dashed line indicates a reproduced EFM.
(Eight Fourteen Modulatio
n) a bit synchronization clock system made by a PLL from the signal,
Dotted lines indicate reference clock systems using the crystal oscillator, respectively. [0007] Reference numeral 10 denotes a CD, and pits on the pit surface are optically read by an optical pickup 12.
The optical pickup 12 is servo-controlled by a focus servo 14, a tracking servo 16, and a pickup feed servo 18. The output signal of the optical pickup 12 is input to the bit synchronization clock generation circuit 22 via the data extraction circuit 20. The bit-synchronous clock generation circuit 22 is formed of a PLL, and the bit-synchronous clock generated by the circuit is sent to each unit. In particular, the signal and the clock are completely synchronized so that the subsequent signal processing can be performed smoothly. The data is also sent to the data extracting circuit 20. Reference numeral 24 denotes a frame synchronization circuit which detects a frame synchronization signal and recognizes a delimiter and an order of each symbol word. Reference numeral 26 denotes an EFM demodulation circuit which converts 14-bit channel bits in symbol words into the original 8 bits.
It has a ROM that converts the bits into data bits and has a conversion table necessary for the conversion. Reference numeral 28 denotes a circuit for performing error correction / correction, deinterleaving, and jitter absorption using the RAM 30. Reference numeral 32 denotes a DA converter for reassembling an analog signal based on digital signal numerical data. The signal obtained by the converter is separated into left and right channel signals by an L / R separation circuit 34, and then a low-pass filter (LPF) 36 The extra frequency components are removed by the and 38 and sent to the audio circuit from the output end 38. Reference numeral 42 denotes a crystal clock generation circuit which supplies a clock to each unit. The rotation of the disk motor 46 is controlled by the motor servo circuit 44 based on the frequency of the frequency-divided signal of both clocks and the phase comparison output so that the clock and the bit synchronization clock maintain a synchronous relationship. 48 is a microcomputer (microcomputer),
This outputs a search command signal in accordance with the subcode data obtained by the EFM demodulation circuit 24 or a key input from the operation key system control circuit 50, and also functions as a control means for displaying on the display 52. Reference numeral 54 denotes a tape selection circuit, and when the cassette tape for recording the CD reproduction signal is for 46 minutes, the switch SW1 is set to 60
When sharing, the switches SW2 are turned on.
The resistors R1 and R2 are for pull-up, and the resistors R3 and R4
Is for microcomputer protection. By the way, T of the innermost line of the CD 10
In the OC (table of contents), the total playing time of the CD, the frame of each song, the playing time of each song, and the like are recorded. Therefore, the TOC can be detected in advance and the TOC can be displayed on the display 52 by one operation of the operation key. Also, between songs can be detected by checking the frame of the song. In the above arrangement, the reproduction signal of the CD is
When recording on a 6-minute tape, the switch SW1 of the tape selection circuit 54 is turned on, and then a play start operation is performed. In response to this play start operation, the microcomputer 48
Perform the work shown in the flowchart of FIG. First, the focus of the optical pickup 12 is servo-controlled by the focus servo 14, and the microcomputer 48 calculates the TOC position from the current address on the CD. Next, pickup feed servo 1
8 to move the optical pickup 12 to the TOC position. Therefore, the contents of the TOC are read, signal-processed, and then stored in the microcomputer 48. After the memory is completed, the tape selection circuit 5
It is determined whether both of the switches SW1 and SW2 are off. If the determination is YES and both switches are off, a normal performance is performed. On the other hand, if the determination is NO, it is next determined whether or not the switch SW2 is turned off.
In the case of S, the normal performance is started after executing the flowchart of FIG. On the other hand, if the determination is NO and the switch SW2 is on, the normal performance starts after executing the flowchart of FIG. By the way, in the flowchart of FIG. 3, after the start, first, the performance time of each music is set to 46 / from the first music.
Add up to 2 (23) minutes. By this addition, the frame of the music number N of the music at the time exceeding 23 minutes is stored. Thereafter, the performance is started, and the pause, that is, the performance is stopped when the frame of the music number N comes. Then, the performance time up to the interruption and the interruption time are measured by a timer, and when the time becomes equal to or longer than 23 minutes + α, the performance is restarted from the frame of the music number N.
By the way, the above α is a preset time to ensure that the recording is performed from the beginning of the song after the tape running direction is changed at the end of the tape and the tape running direction is changed there. This is for absorbing errors such as time and leader tape length. When the above-described recording is performed, a non-recording portion is inevitably formed at the end or the beginning of the tape. I don't think it will. In the above example, only the tapes of 46 minutes and 60 minutes are selected by the switches SW1 and SW2 of the tape selection circuit 54. However, it is also possible to select any tape at other times. It is possible. As described above, the optical disk reproducing apparatus of the present invention determines the music to be reproduced automatically based on the input time, and performs the reproduction of the music recorded on the optical disk. When the time is input, the control unit controls to play back the song determined by the determination unit when the time is input, and to perform the normal playback when the time is not input. In such a case, the operability is improved because operations such as selection of music are simplified. [0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of a reproducing apparatus according to the present invention. FIG. 2 is a flowchart showing work performed by a microcomputer in FIG. 1; FIG. 3 is a flowchart showing work performed by the microcomputer in FIG. 1; [Description of References] 10 CD 48 Microcomputer 54 Tape selection circuit SW1, SW2 Switch

Claims (1)

(57) [Claims] In an optical disc reproducing apparatus for reproducing an optical disc on which a plurality of music pieces are recorded, a deciding means for automatically deciding a music piece to be reproduced based on the input time; Control means for performing playback of the music determined by the determination means when the time has been input, and performing normal playback when the time has not been input. Optical disc playback device. 2. The optical disc according to claim 1, wherein the optical disc has music time information on the plurality of music pieces recorded thereon, and the determining means determines the music piece to be reproduced based on the music piece time information. Playback device. 3. The control means controls the reproduction of the music recorded on the optical disc so that if the time is inputted, the reproduction of the music determined by the determination means is performed and then the reproduction is interrupted. 3. The optical disc reproducing apparatus according to claim 1, wherein