JPS6387642A - Random playing system for multi-disk player - Google Patents

Abstract

PURPOSE:To raise a probability that a piece of music suiting user's desire is selected, by setting plural numerical value ranges different from one another, which correspond to plural recording disks and accord with the number of times of reproducing, in response to a command. CONSTITUTION:The number of times of reproducing of each of plural disks stored in plural storage positions is counted and stored, and numerical value ranges different from one another which correspond to plural recording disks and accord with the number of times of reproducing are set in response to the command. One of plural numerical values existing in one of plural numerical value ranges is generated at random, and recorded information on the recording disk corresponding to one of plural numerical value ranges where the general numerical value exists is reproduced. Thus, the numerical value range corresponding to a disk whose frequency in reproducing is high is extended to raise a probability that this disk is selected, and disks are reproduced at random with a high probability that the piece of music suiting user's desire is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a reproduction method in a multi-disc player.

BACKGROUND ART As a playback method for a multi-disc player that can store a plurality of discs and can perform continuous playback by sequentially selecting the stored discs, random numbers are generated, and the generated random numbers are used to play songs recorded on the plurality of discs. A random play method has already been devised in which one of the songs is selected and a plurality of songs are played sequentially in a randomly set order. However, in such a conventional random play system, songs are selected without regard to the user's sensibilities, so there is a drawback that a song that matches the user's taste may not be selected for a long time.

SUMMARY OF THE INVENTION The present invention provides a random play system that allows random play with a high probability of selecting a song that matches the user's taste.

In the random play method in the multi-disc player according to the present invention, the number of times each disc is played is counted and stored in a plurality of recording discs stored in a plurality of storage positions, and the number of times each disc is played is counted and stored in response to a command. Setting a plurality of mutually different numerical ranges that correspond to each other and depending on the number of playbacks, and randomly generating one of the plurality of numerical values existing in any one of the plurality of numerical ranges,
One of the plurality of numerical ranges in which the generated numerical value exists
It is characterized by reproducing the recorded information of the recording disk corresponding to.

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 magazine that stores N (N is a natural number of 2 or more) disks arranged in order at a predetermined pitch. The magazine 1 is provided with N trays that carry disks and can be protruded from and housed in the magazine body. The magazine 1 is detachably attached to a predetermined attachment portion. One of the N disks D1 to DN stored on the N trays each serving as a plurality of disk storage positions provided in the magazine 1 is fixed to the rotating shaft of the spindle motor 3 by the disk ejecting and conveying mechanism 2. The disc is conveyed onto the disc supporting surface of the turntable 4 and clamped thereon. The disc ejecting and transporting mechanism 2 includes a protruding member that protrudes the tray of the magazine 1 and moves the disc onto the disc supporting surface of the turntable 4, and a projecting member that causes the disc to move onto the disc supporting surface of the turntable 4 when the disc is moved onto the disc supporting surface of the turntable 4. It has a clamp mechanism that clamps the disk, a moving plate that changes the relative position of this protruding member with respect to the magazine 1 in the tray arrangement direction, and a sensor that detects the position of the moving plate, the operation of the clamp mechanism, etc. ing. This disk ejection transport mechanism 2
By moving the movable plate in , the position of the protruding member changes, making it possible to select a disc. These magazines 1 and disk ejecting transport mechanism 2
The structure is described in detail in the specification of Japanese Patent Application No. 153651/1983.

Recorded information on the disk Dn, which is taken out of the magazine 1 by the disk ejecting and transporting mechanism 2 and clamped onto the disk holding surface of the turntable 4, is read by the optical pickup 6. The pickup 6 includes a laser diode, an objective lens, a focus actuator, a tracking actuator, a photodetector, and the like.

The output of the pickup 6 is supplied to each of a focus servo circuit 7, a tracking servo circuit 8, and a reproduction clock generation circuit 9 including an RF amplifier.

In the focus servo circuit 7, a focus error signal is generated by, for example, an astigmatism method, and a focus actuator in the pickup 6 is driven in accordance with this error signal. As a result, the laser light emitted from the laser diode and passed through the objective lens is focused on the recording surface of the disk Dn, forming an information detection light spot. Further, in the tracking servo circuit 8, a tracking error signal is generated by, for example, a push-pull method, and this error signal is sent to the tracking actuator in the pickup 6 and the carriage servo circuit 1o. The output of the carriage servo circuit 1o is supplied to a motor Ma that drives a carriage (not shown) carrying the pickup 6, and is sent in the radial direction of the pickup 6 or the disk Dn.

A reproduced clock signal for demodulation is generated in the reproduced clock generation circuit 9 and supplied to the spindle servo circuit 11. In the spindle servo circuit 11, a drive signal according to the phase difference between the reproduced clock and the reference clock from the clock generation circuit 12 is generated to drive the spindle motor 3, and control the track linear velocity of the disk Dn to be constant. be done. Further, the output of the RF amplifier in the reproduced clock generation circuit 9 is supplied together with the reproduced clock to an EFM demodulation circuit 13 including a frame synchronization circuit. The demodulated output of the EFM demodulation circuit 13 is processed by a data processing circuit 14 that performs deinterleaving, error detection, correction, correction, etc. of the demodulated data signal.

Thereafter, the demodulated output is temporarily stored in a data memory 15, read out using a clock signal from a clock generation circuit 12, and converted into an analog signal by a D/A (digital/analog) converter 16. This analog signal is output as left and right audio signals via an LPF (low pass filter) 17 and an amplifier 18. Furthermore, amplifier 18
is configured to receive control data and change its frequency characteristics in accordance with the control data.

On the other hand, the control signal in the data from the EFM demodulation circuit 13 is supplied to the system controller 20, and during the song,
Various information such as song intervals, song numbers, playing times, and disc model numbers are read. The system controller 20 is formed of one or more microcomputers including a processor, ROM (read-only memory), RAM (random access memory), an interface circuit, a timer, and the like. In this system controller 20, a processor is stored in advance in the ROM and operates according to a program based on the flowchart shown in FIG. The output data is processed to supply various commands and data to the carriage servo circuit 10, spindle servo circuit 11, amplifier 18, display 22, and drive circuits 24 and 25. The random number generation circuit 23 has an m-ary counter whose count value is reset when a count pulse is input a specified number of times m, and supplies extremely short-cycle count pulses to this m-ary counter to output data. It is configured to latch and output the output of the m-ary counter in response to a command.

Further, the drive circuits 24 and 25 are connected to the disk ejecting and transporting mechanism 2.
It is configured to supply a driving current according to a command to a motor M b % M c that drives the moving plate and the protruding member, respectively. Note that 26 is a RAM that stores information from the system controller 20.

Next, the operation of the processor in the system controller 20 when the number of disks that can be stored in the magazine 1 is N-6, that is, 6, will be explained with reference to the flowchart in FIG.

When a play command is issued by key operation on the operation unit 21 during execution of the main routine, the processor executes step S.
1 and sends a command to the drive circuits 24 and 25 in accordance with the sensor output from the disc ejecting and transporting mechanism 2 so that the disc Dn specified at the time of generation of the play command is transported onto the turntable 4 and clamped. do. Next, the processor proceeds to step S2 and determines whether the disc number of the disc Dn clamped on the turntable 4, that is, the number assigned to each disc stored in each of the six storage positions, is 1. When it is determined in step S2 that the disk number is 1, the processor moves to step S3 and performs the RA
A predetermined value is added to the contents of address C1 of M26.

Next, the processor moves to step S4 and operates the operation section 2.
It is determined whether a random play command is issued by key operation No. 1. When it is determined in step S4 that a random play command has been issued, the processor moves to step S5 and stores each address 01 to C6 of the RAM 26.
Data indicating the value m obtained by adding the contents of are sent to the random number generation circuit 23, so that the counter in the random number generation circuit 26 becomes an m-ary counter. Next, the processor moves to step S6, sends a data output command to the random number generation circuit 23, and takes in the output data Q of the random number generation circuit 23. Next, the processor moves to step S7 and determines whether the numerical value corresponding to the output data Q exists in the range H1 of 01 or less.

When it is determined in step S7 that the numerical value corresponding to the output data Q exists in the range H1, the processor moves to step S8, and the disk D1 to which 1 is assigned as the disk number is conveyed onto the turntable 4 and clamped. A command is sent to the drive circuits 24 and 25 in accordance with the sensor output from the disk ejecting and transporting mechanism 2 so that the drive circuit 24 and the drive circuit 25 are driven.

Next, the processor moves to step S9 and sends a data output command to the random number generation circuit 23.
The music number R of the music piece to be randomly played is determined from the data that has been taken in. This step S9
The processing in can be performed as follows. In other words, first calculate the number of recorded songs from the information of the start song number and end song number in the TOC information (this value is set as P), then repeatedly subtract P from the output data Q until it becomes impossible to subtract any more. Obtain the remaining number q (the remainder when Q is divided by P). The value obtained by adding the start song number to this number becomes the song number R.

Next, the processor moves to step SIO and searches for the recording position of the song having the song number determined in step S9. Next, the processor moves to step Sll and determines whether the search operation has ended. Step Sll
If it is determined that the search operation has not been completed in step S11, the processor executes step S11 again, and only when it is determined that the search operation has been completed, proceeds to step S12, which is a subroutine for controlling the play operation. call. After executing this subroutine, the processor resumes execution of the main routine. If it is determined in step S2 that the disc number is not 1, the processor proceeds to step 813 and determines whether the disc number is 2 or not. When it is determined in step 813 that the disk number is 2, the processor moves to step S14 and stores the disk number at address C2 in the RAM 26.
A predetermined value is added to the contents of , and the process moves to step S4.

If it is determined in step 813 that the disc number is not 2, the processor moves to step S15 and determines whether the disc number is 3 or not. If it is determined in step S15 that the disk number is 3, the processor proceeds to step S16, adds a predetermined value to the contents of address C3 of the RAM 26, and proceeds to step S4.

If it is determined in step S15 that the disc number is not 3, the processor proceeds to step S17 and determines whether the disc number is 4 or not. If it is determined in step S17 that the disk number is 4, the processor proceeds to step 818, adds a predetermined value to the contents of address C4 of the RAM 26, and proceeds to step S4.

If it is determined in step S17 that the disc number is not 4, the processor proceeds to step S19 and determines whether the disc number is 5 or not. When it is determined in step S19 that the disk number is 5, the processor moves to step S20, adds a predetermined value to the contents of address C5 of the RAM 26, and moves to step S4. Further, when it is determined in step S19 that the disk number is not 5, the processor moves to step S21 and stores the disk number at address C6 of the RAM 26.
A predetermined value is added to the contents of , and the process moves to step S4.

Further, if it is determined in step S4 that a random play command has not been issued, the processor immediately moves to step S12.

Further, when it is determined in step S7 that the numerical value corresponding to the output data Q does not exist in the range H1, the processor moves to step S22, and the processor moves to step S22 so that the numerical value corresponding to the output data Q is greater than 01 and less than or equal to C1102. It is determined whether it exists in range H2. When it is determined in step S22 that the numerical value corresponding to the output data Q exists in the range H2, the processor moves to step 823 and sets the disk ejecting and conveying mechanism so that the disk D2 is conveyed onto the turntable 4 and clamped. A command is sent to the drive circuits 24 and 25 according to the sensor output from 2, and the process moves to step S9.

When it is determined in step S22 that the numerical value corresponding to the output data Q does not exist in the range H2, the processor moves to step S24 and determines that the numerical value corresponding to the output data Q is greater than CI +C2 and C, +c, , 10 It is determined whether it exists in the range H3 below c3. Step S2
4, when it is determined that the numerical value corresponding to the output data Q exists in the range H3, the processor executes step S2.
In step S5, a command is sent to the drive circuits 24 and 25 in accordance with the sensor output from the disk ejecting and conveying mechanism 2 so that the disk D3 is conveyed onto the turntable 4 and clamped, and the process proceeds to step S9.

When it is determined in step S24 that the numerical value corresponding to the output data Q does not exist in the range H3, the processor moves to step S26 and determines that the numerical value corresponding to the output data Q is greater than CI +C2+03 and CI +C2+C3.
It is determined whether it exists in range H4 below +Ca. When it is determined in step S26 that the numerical value corresponding to the output data Q exists in the range H4, the processor moves to step S27 and sets the disk ejecting conveyance mechanism so that the disk D4 is conveyed onto the turntable 4 and clamped. Drive circuit 24 and 2 depending on the sensor output from 2
A command is sent to step S9, and the process moves to step S9.

When it is determined in step S26 that the numerical value corresponding to the output data Q does not exist in the range H4, the processor moves to step 82g and determines that the numerical value corresponding to the output data Q is greater than CI + C2 + C3 + C4 and CI + C2
It is determined whether +C3+Ca exists in range H5 below +Cs. When it is determined in step 828 that the numerical value corresponding to the output data Q exists in the range H5,
The processor proceeds to step S29 and sends a command to the drive circuits 24 and 25 in accordance with the sensor output from the disk ejecting and conveying mechanism 2 so that the disk D5 is conveyed onto the turntable 4 and clamped, and then proceeds to step S9. Transition.

When it is determined in step 828 that the numerical value corresponding to the output data Q does not exist in the range H5, the processor moves to step S30 to take out and transport the disc so that the disc D6 is transported onto the turntable 4 and clamped. A command is sent to the drive circuits 24 and 25 in accordance with the sensor output from the mechanism 2, and the process moves to step S9.

Through the above operations, the numerical range H1 to C6 is set according to the content of each address C1 to C6 of <RAM-16=26, as shown in FIG.
H6 is set, and a disk that has been played a large number of times, that is, a disk in which a song that matches the user's taste is recorded, has a large corresponding range and has a high probability of being selected. As a result, random play is performed with a high probability of selecting a song that matches the user's preference.

Effects of the Invention As detailed above, the random play method in the multi-disc player according to the present invention counts and stores the number of times each disc has been played of a plurality of recording discs stored in a plurality of storage positions. In response, a plurality of mutually different numerical ranges corresponding to the plurality of recording discs and corresponding to the number of playbacks are set, and one of the plurality of numerical values existing in any of the plurality of numerical ranges is set to zero. Since the recorded information of the recording disc corresponding to one of the plurality of numerical ranges in which the generated numerical value exists is generated randomly, the numerical range corresponding to the disc that has been played many times is widened, and the number of plays is increased. The probability that a disc with a large number of discs will be selected will be high, and random play will be performed with a high probability that a song that matches the user's taste will be selected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a multi-disc player according to the method of the present invention, FIG. 2 is a flowchart showing the operation of the device shown in FIG. 1, and FIG. 3 is a diagram showing an example of a set numerical range. be.

Claims (1)

[Claims] A random play method in a multi-disc player that has a plurality of storage positions for storing recording discs and plays back recorded information on the recording discs stored in the plurality of storage positions, wherein the plurality of storage positions respectively store the recording discs. counting and storing the number of playbacks for each of the plurality of recording disks, and in response to a command, setting a plurality of mutually different numerical ranges corresponding to each of the plurality of recording disks and corresponding to the number of playbacks; , a recording disk that randomly generates one of a plurality of numerical values existing in any one of the plurality of numerical value ranges, and corresponds to one of the plurality of numerical value ranges in which the generated numerical value exists. A random play method in a multi-disc player characterized by playing back recorded information.