JP2741370B2 - Song playback method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reproducing music recorded on a compact disk player or the like. 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. It is uncomfortable for a person who plays and listens to the tape recorded in this way because the music is cut off in the middle. [0004] A music reproducing method according to the present invention comprises:
A reproducing method for reproducing a predetermined music from an optical disc on which information of each music is recorded and time information of each music is collectively managed and recorded, comprising: Collecting the time information recorded on the optical disc and, prior to the reproduction of the music recorded on the optical disc, determining the reproducible music within a time based on a preset time based on the collected time information And, in response to a playback command, performing the playback of the stored music if the time has been set in advance, and performing the normal playback if the time has not been set in advance. It is characterized by having. According to the music reproducing method of the present invention, the music can be reproduced by a simple operation without the music being cut off in the middle. 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 chain 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 which reassembles an analog signal based on numerical data of a digital signal.
The signal obtained by the converter is converted to an L / R separation circuit 34.
The signal is separated into left and right channel signals, and after that, extra frequency components are removed by low-pass filters (LPFs) 36 and 38, and the signals are transmitted from an output terminal 38 to an audio circuit. 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
The OC (table of contest) records the total playing time of the CD, the frame of each song, the playing time of each song, and the like. 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 switches SW1 and SW2 are off. If the determination is YES and both switches are off, normal performance is performed. On the other hand, if the determination is NO,
Next, it is determined whether or not the switch SW2 is off.
At the time of ES, 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 more 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-mentioned 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-described example, only the 46-minute and 60-minute tapes 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. . As described above, according to the present invention, music that can be reproduced within the time only by setting the time in advance is stored, and the stored music is reproduced. By setting the time in advance according to the length of the cassette tape on which the content is to be recorded, it is possible to record on the cassette tape without the music being interrupted. [0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of a music reproducing method 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 Signs] 10 CD 48 Microcomputer 54 Tape selection circuit SW1, SW2 Switch

Claims (1)

(57) [Claims] A reproducing method for reproducing a predetermined song from an optical disc in which information of each song is recorded and time information of each song is collectively managed and recorded, wherein a step of collecting time information recorded on the optical disc Prior to playback of a song recorded on the optical disc,
A step of determining and storing a reproducible song within a time based on a preset time based on the collected time information; and, if the time has been set in advance in response to a playback command, Reproducing the stored music, and performing normal reproduction when the time has not been set in advance.