JPH073498Y2 - Recording medium playback device - Google Patents

Description

[Detailed Description of the Invention] Overview First information to be reproduced originally, such as a compact disc, and second information of contents related to the first information,
In a reproducing apparatus for a recording medium in which third information indicating the number of reproducing / recording areas in which the first and second information are recorded and a third information are recorded, a free running counter is set within a count value range corresponding to the third information. When the second information reproduced by the counting operation is changed, for example, when the reproduction of a certain recording area is completed, the next reproducing / recording area is determined corresponding to the count value of the free running counter. In this way, the structure for random reproduction is simplified by using the free running counter.

INDUSTRIAL APPLICABILITY The present invention is preferably implemented in a compact disc player or the like, and is intended to reproduce the first information, the second information of the contents related to the first information, and the first and second information. The present invention relates to a device for randomly reproducing a recording medium on which third information indicating the number of reproduction recording areas is recorded.

2. Description of the Related Art In a compact disc player, a structure having a random reproduction function for automatically reproducing in a music order different from the order recorded on the compact disk is used. In performing such random reproduction, in a typical conventional technique, the number of operation bits is 8 which is easy to perform four arithmetic operations.
Using a high-performance and high-performance microcomputer with a bit or more, a random number is generated by a combination of the four arithmetic operations,
It is configured to play the music piece of the rank corresponding to the random number.

Problems to be Solved by the Invention An inexpensive and low-priced 4-bit microcomputer widely used in compact disk players has only an addition / subtraction function, which complicates the program for random number generation, and therefore, it is practically impossible to perform random reproduction. Atsuta

An object of the present invention is to provide a recording medium reproducing apparatus capable of realizing random reproduction with a simple structure.

Means for Solving the Problems In the present invention, the first information to be originally reproduced and the second information having the content related to the first information are recorded along with the reproduction recording area. In a reproducing device of a recording medium in which third information indicating the number of reproduction recording areas is recorded, the reproduced third information is set, and a counting operation is performed within a range of a count value corresponding to the third information. A running counter, a detecting means for detecting a change in the reproduced second information, and an output of the free running counter in response to an output of the detecting means to determine a next reproduction / recording area. This is a reproducing device for a recording medium.

According to the present invention, the recording area of the recording medium stores the first information to be originally reproduced and the second information having the contents related to the first information, and is detected during the reproduction of the recording medium. The second information is monitored by the means.

The recording medium also records third information indicating the number of reproduction / recording areas in which the first and second information are recorded. During the reproduction, the free-running counter performs a counting operation within the range of the count value corresponding to the third information, and when the detecting means detects the change of the second information, the free-running counter is operated. The recording area corresponding to the output of is reproduced.

In this way, using the count value of the free running counter, which is a random value defined within the range of the third information,
Random reproduction of the recording medium can be performed with a simple structure.

Embodiment FIG. 1 is a block diagram showing the electrical construction of a compact disc reproducing apparatus 1 according to an embodiment of the present invention. The compact disk 3 placed on the turntable 2 is rotationally driven by a spindle motor 4. The information recorded on the compact disk 3 which is rotationally driven in this manner is detected by the optical pickup 5, and is input from the waveform shaping circuit 6 to the signal processing circuit 7. In the signal processing circuit 7, the detection signal is corrected on the time axis, and the acoustic signal data, which is the first information to be originally reproduced, is converted into an analog acoustic signal by the digital / analog converter 8 and then power amplification is performed. It is given to the speaker 10 from the circuit 9 and made into sound.

The output from the waveform shaping circuit 6 is also given to the focus servo circuit 11, the tracking servo circuit 12, and the rotation speed servo circuit 13, respectively.
Based on the output from the focus servo circuit 11, the focus depth of the optical pickup 5 is adjusted, and the tracking servo circuit 12 adjusts the compact disk 3 of the optical pickup 5.
Of the rotation speed servo circuit
Reference numeral 13 controls so that the linear velocity of the track read by the optical pickup 3 becomes constant.

In the compact disc 3, the acoustic signal data and subcodes related to the acoustic signal data are recorded on a spirally formed track at every sampling period. This subcode is derived from the signal processing circuit 7 and input to the microcomputer 21.

An input means 22 is provided in association with the microcomputer 21. The input means 22 includes, for example, a reproduction switch 23 for starting a reproduction operation and a compact disc 3.
Discharge switch 24 for performing the discharge operation of the program, and a program reproduction switch 25 capable of presetting the reproduction music order.
And a random reproduction switch 26 capable of performing random reproduction as described later.

The microcomputer 21 determines the reproducing / recording area in response to the input from the input means 22, and the tracking servo circuit
The output is derived to 12 and the rotation speed servo circuit 13. In addition, the display device 27 in connection with this microcomputer 21
Is provided, and the playing time and the like that can be detected by the subcode of the Q channel are displayed.

The sub-code includes a P-channel sub-code together with the Q-channel sub-code.
The subcode of the channel is set to "1" only for a predetermined time, for example, 2 seconds from the beginning of the music of the audio signal data, and the remaining period is set to "0".

When the random reproduction switch 26 is operated to select the random reproduction, the micro-computer 21 which is the detecting means monitors the sub-code of the P channel which is the second information, and this sub-code changes from "0" to " When it is "1", it is determined that the performance has ended, and the song to be reproduced next is determined based on the count value of the free running counter 28 built in the microcomputer 21, and the optical pickup 5 Move to the position corresponding to the song and continue playback.

At the innermost circumference of the track of the compact disc 3, the number of pieces of music recorded on the compact disc 3, which is called lead-in information, the total playing time, etc. are recorded. When the compact disk 3 is loaded, the micro computer
21 moves the optical pickup 5 to this innermost position,
The lead-in information is read. From the lead-in information read in this way, the number of pieces of music recorded on the compact disc 3, which is the third information, is read out and set in the free running counter 28. The free running counter 28 counts within the range of the count value corresponding to the number of music pieces.

FIG. 2 is a flow chart for explaining the random reproduction operation performed as described above. Regenerative switch
When the playback operation is started by operating 23, it is determined in step n1 whether or not the reading of the lead-in information is completed, and if not, the reading-in processing of the lead-in information is performed in step n2, and step n3 Move. Step n3
Then, it is determined whether or not all the lead-in information has been read, and if not, the process returns to the step n2, and if so, the process moves to step n4. Step
At n4, the tune number A to be reproduced first is set to the count value C of the free running counter 28, initialization is performed, and then the process proceeds to step n5.

When the reading of the lead-in information is completed in step n1, the process proceeds to step n6 and the count value C
, It is determined whether or not it is the final song number B corresponding to the number of songs detected from the lead-in information, and if so, the process proceeds to step n4 to perform the initialization, and if not, the count value is obtained in step n7. It is updated by adding 1 to C. In step n8, it is judged whether or not the count value C updated in the step n7 corresponds to the song number which has been reproduced in the past. If so, step n7 is repeated again, and if not, step n7 is repeated.
Move to n5.

At step n5, it is determined whether or not the random reproduction switch 26 has been operated. If not, the process proceeds to step n9, it is determined whether or not the random reproduction operation is being performed, and if so, the process proceeds to step n10. At step n10, it is judged whether or not the song number has changed based on the detected P-channel sub-code, and if so, the process moves to step n11 to see if the song number has completed one cycle, that is, to the compact disc 3. It is determined whether all the recorded songs have been selected, and if so, the process proceeds to step n12. In step n12, after the memory of the reproduced song number is erased, the process proceeds to step n13, and when the reproduction of all the songs is not completed in step n11, the process directly proceeds to step n13.

At step n13, the count value C of the free running counter 28 is read out, and at step n14 it is set as the music number to be reproduced next. In step n15, the song number to be played next is stored together with the song number played in the past. In step n16, the optical pickup 5 is moved to the position corresponding to the song number, and in step n17, the playback operation is started. It At step n18, after waiting for 25 msce, the process returns to step n1.

In step n5, when the random reproduction switch 26 is operated, the process proceeds to step n21, where it is determined whether or not the random reproduction operation is currently being performed, and if not,
That is, when starting the random playback operation, the step
Moving to n22, the flag F for performing random playback is "1"
Then, the process goes to step n13.

When random playback operation is being performed in step n21,
That is, when ending the random reproduction operation, the step
At n23, the memory of the reproduced song number is erased, the flag F is reset to "0" at step n24, and then the process goes to step n18. When the random reproduction operation is not being performed at step n9, and when the song number has not changed at step n10, the process directly goes to step n17.

Thus, the compact disc reproducing device 1 according to the present invention
Then, since the random playback of the compact disk 3 is performed by using the count value of the free running counter 28 defined within the range of the number of songs, complicated calculation processing for determining the number of the played song becomes unnecessary, Random reproduction can be performed even if the microcomputer 21 has a relatively small arithmetic processing capacity and is inexpensive. In addition, the song numbers that have been played once are stored, and those songs are not played until the playback of all songs is completed, thus enabling effective random playback without making the listener tired. You can

The random reproduction operation as described above can also be suitably implemented by a so-called digital audio tape recorder or the like in which the second information having the content related to the first information is recorded. Further, the random reproduction may be performed not for each song but at the time when the reproduction is finished for a predetermined time, for example, about 20 seconds. Furthermore, the change in the song number may be detected by detecting the change in the TNO. (Track number) of the Q-channel subcode.

As described above, according to the present invention, the reproduction storage area is determined based on the count value of the free running counter defined in advance within the range of the count value corresponding to the third information, and the random reproduction is performed. Therefore, the arithmetic processing for determining the reproduction storage area can be simplified, and the random reproduction can be performed by the low-performance low-performance micro computer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an electrical configuration of a compact disk reproducing apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a flow chart for explaining a random reproducing operation. 1 ... Compact disk reproducing device, 3 ... Compact disk, 5 ... Optical pickup, 7 ... Signal processing circuit, 21 ... Microcomputer, 22 ... Input means, 26
…… Random playback switch, 28 …… Free running counter

Claims (1)

[Scope of utility model registration request] 1. The first information to be reproduced originally and the second information having the contents related to the first information are recorded along the reproduction recording area, and the number of recorded reproduction recording areas is recorded. In the reproducing device of the recording medium on which the third information represented is recorded, the reproduced third information is set, and the free-running counter performing the counting operation within the range of the count value corresponding to the third information is reproduced. A reproducing device for a recording medium, characterized by detecting a change in the second information, and reading the output of the free running counter in response to the output of the detecting device to determine the next reproducing / recording area.