JP2803064B2 - Optical disk player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc jockey (hereinafter abbreviated as DJ) technique using an analog disc by connecting audio data recorded in an audio memory in advance with data to be actually reproduced. The present invention relates to an optical disk player which can use the optical disk.

[0002]

2. Description of the Related Art Recently, analog disks have been reduced and replaced with optical disks such as compact disks (CDs). However, analog disks are still widely used in discos and the like. This is because DJs and the like use a special reproduction method using an analog disk. For example, there are `` brake effect playback '', which holds the turntable of the analog player being played with your finger and slowly stops it, and `` scratch playback '', which puts a needle on the disc and quickly turns the turntable with your hand to produce a rubbing sound, etc. It is an effective means for sound.

[0003]

However, as described above, the production volume of analog disks has been greatly reduced, and the special reproduction method for generating sound effects has a problem that the disks are quickly damaged. In addition, replacing an optical disk with mechanical means for playback in the same manner as an analog disk causes a number of problems in the playback method of the optical disk. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problem by obtaining a configuration in which an analog disk is replaced with an optical disk and sound effects equivalent to those of an analog disk player can be provided.

[0004]

According to the present invention, there is provided an optical disc player for reproducing a recording medium on which digital data is recorded at a sampling frequency FS.
Fixed clock output means for outputting a clock corresponding to S, variable clock output means for outputting a clock variable with respect to the sampling frequency FS, and a first switch for switching between the variable clock output means and the fixed clock output means.
Switching means and second switching means, first reproducing means for reproducing and outputting digital data recorded on the recording medium at a clock selected by the first switching means, and
Storage means for storing output data of the reproduction means, second reproduction means for reading and outputting digital data stored in the storage means at the clock selected by the second switching means, and second switching means Control means for independently controlling the clock selected in step 1 and the clock selected by the first switching means, and the output of the first reproducing means and the output of the second reproducing means are selected or synthesized and outputted. A third switching means is provided. Also, in the optical disk player according to the second aspect, in the optical disk player according to the first aspect, the control unit continuously converts the digital data stored in the storage unit from a frequency lower than the sampling frequency FS to a clock corresponding to the sampling frequency FS. Then, the variable clock is changed to control the reading speed of the digital data. Further, in the optical disk player according to the third aspect, in the optical disk player according to the first aspect, the control means converts the digital data stored in the storage means from a sampling frequency FS to a sampling frequency FS.
An optical disc player, wherein the variable clock is changed continuously to a clock corresponding to a lower frequency to control the reading speed of the digital data. It is a characteristic. Also, in the optical disk player according to the fourth aspect, in the optical disk player according to the first aspect, the control unit may be configured to convert the digital data stored in the storage unit from a frequency lower than the sampling frequency FS to a substantially sampling frequency FS or a sampling frequency FS. After changing to a clock corresponding to a high frequency, the variable clock is continuously changed to a clock corresponding to a frequency lower than the sampling frequency FS to control the reading speed of the digital data. . In the optical disk player according to the fifth aspect, in the optical disk player according to the first aspect, the control means converts the digital data stored in the storage means from a frequency lower than the sampling frequency FS to a substantially sampling frequency FS or a sampling frequency FS.
After changing the variable clock to a clock corresponding to a frequency higher than S, the digital data stored in the storage unit is reversely reproduced to continuously change the variable clock to a clock corresponding to a frequency lower than the sampling frequency FS. And controlling the reading speed of the digital data.

[0005]

Therefore, according to the optical disk player of the first aspect, the first reproducing means for reproducing and outputting the digital data recorded on the recording medium, and the digital data storing the output data of the first reproducing means. Is reproduced by a clock selected by the second switching means and output, and independently controls the clock selected by the first reproduction means and the clock selected by the second reproduction means. Therefore, the output can be performed with the read speed of the first reproducing unit and the read speed of the second reproducing unit changed. Further, either the output of the first reproducing means or the output of the second reproducing means can be selected or synthesized and output.
According to the optical disk player of the second aspect, the same function as that in which the control means places a disk on the analog player and starts reproduction from a state in which the rotating turntable is forcibly stopped. Can be obtained. According to the optical disk player of the third aspect,
By the control means, it is possible to obtain the same function as forcibly stopping the rotating turntable from the state in which the disc is loaded on the analog player and the reproduction is performed. Further, according to the optical disk player of the fourth aspect, the same function as that in which the control means places the disk on the analog player to put it in a reproduction state, and after manually turning the turntable, stopping and reproducing. Can be obtained. Further, in the optical disk player according to the fifth aspect, the control means puts the disk on the analog player to put the disk in a reproducing state, and reproduces the data by rotating the turntable by hand in a direction opposite to the rotation direction of the normal reproduction. A similar function can be obtained.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. The audio data system will be described. In FIG. 1, an optical pickup 2 for reading information from an optical disc 1
To read and output this information,
A digital signal (audio data) output from the servo circuit 3 is input to a digital signal processor (DSP) 4 and a digital filter 5. .

The DSP 4 performs processing such as temporary storage of audio data and fade-in and fade-out, and outputs the processed data. The DSP 4 is connected to an audio memory 6 for temporarily storing audio data. The output of the DSP 4 is input to the digital filter 7, D / A converted by the D / A converter 8, input to the mix amplifier 9 via the changeover switch 20b, and output from the output of the mix amplifier 9 as a reproduction signal. On the other hand, the output of the digital filter 5 is also D / A converted by the D / A converter 10, and
The signal is input to the mix amplifier 9 via a, and is output from the output of the mix amplifier 9 as a reproduction signal.

The clock signal system will be described. The clock signal system has a main fixed clock 11,
The output is input to the programmable frequency divider 12 and the frequency divider 13. A clock signal that is changed by the programmable frequency divider 12 and the PLL 14 is generated and input to the clock selector 15 and the clock selector 16 as a variable clock (variable CLK). The clock input from the fixed clock 11 to the frequency divider 13 is a fixed clock (fixed CL).
K) as clock selector 15 and clock selector 1
6 is input. The clock signal selected by the clock selector 15 is input to the DSP 4 as a main clock (main CLK).

The main clock selected by the clock selector 15 is passed through a frequency divider 19 to a bit clock signal (BCL) for dividing audio data into bits.
K) is generated and input to the basic clock selector 17. The clock signal selected by the clock selector 16 is input to the servo circuit 3. In the servo circuit 3, a bit clock signal (BCLK) for dividing the audio data into one bit is generated and output, and is input to the digital filter 5 and the basic clock selector 17. Also, a clock signal (LRC) for dividing the audio data into two audio data, L channel data and R channel data.
K) is also generated and output in the servo circuit 3 and input to the digital filter 5 and the basic clock selector 17.
BCLK and LR selected by the basic clock selector 17
The clock signal of CK is supplied to the DSP 4 and the digital filter 7.
Is input to

Servo circuit 3, DSP 4, programmable frequency divider 12, changeover switch 20a, changeover switch 20
b, the clock selectors 15 and 16 and the basic clock selector 17 are connected to the CPU 18 by control signal lines.
18. With the above configuration, DS
Since the clock input to P4 and the clock input to the servo circuit 3 can be independently selected, the reading speed of the audio data from the DSP 4 and the reading speed of the audio data from the optical disk 1 can be handled separately. Also,
The reproduction output of the audio data from the DSP 4 and the reproduction output of the audio data from the optical disk can be selected and output or mixed and output by the changeover switches 20a and 20b. Then, by performing the control described below, it is possible to obtain the same function as the special reproduction of the analog disk.

(Embodiment 1) The case of performing normal reproduction will be described with reference to the explanatory diagram of FIG. 2 and the flowcharts of FIGS. When an instruction to set the optical disk 1 in the optical disk player or to select a new music is given to the CPU 18 from an operating means (not shown), the clock signal of the DSP 4 and the servo circuit 3 is changed by the control signal from the CPU 18 to a clock selector. 15,1
6 selects a fixed CLK, and the basic clock selector 17 selects LRCK and BCLK from the servo circuit 3. Then, audio data from the designated reproduction start position of the optical disc 1 is stored in the audio memory 6 in advance through the DSP 4 as shown in the flowchart of FIG. After the audio data is stored from the memory start position (FIG. 2) of the audio memory 6 to the memory end point (FIG. 2) of the audio memory 6, when the start of reproduction is instructed from an operating means (not shown), the CP
As shown in the explanatory diagram of FIG. 2, first, the reproduction of the audio data stored in the audio memory 6 is started from the head of the memory in response to the control signal from U18.

The point in time at which the reading of the audio data stored in the audio memory 6 proceeds and new audio data from the optical disk 1 can be stored (at the point when the data is read up to the position shown in FIG. 2). Then, as shown in the flowchart of FIG. 3, the audio data to be transferred to the preset position (the position of FIG. 2) in the audio memory 6 is read from the optical disc 1 and stored by the control signal from the CPU 18. When the end point (the position shown in FIG. 2) of the sound data stored in the sound memory 6 is reached, the sound data is stored again from the beginning (the position shown in FIG. 2). At this time, the difference between the reproduced point and the stored point becomes the margin data (FIG. 2). Thus, the reproduction is continued while the memory is kept.

(Embodiment 2) As shown in the flowchart of FIG.
The control signal from 18 switches the clock selector 15 and the basic clock selector 17 to make the DSP 4 clock a variable clock. Further, the servo circuit is set to a fixed clock by the clock selector 16. At the start of playback,
The programmable frequency divider 12 is controlled by a control signal from the CPU 18.
To make the frequency of the variable clock of the DSP 4 lower than the frequency of the fixed clock, and then gradually increase the frequency of the clock. When the frequency of the fixed clock becomes the same as that of the fixed clock, the clock selector 15 is set to the fixed clock by the control signal from the CPU 18 and the basic clock selector 17
Is switched to the clock from the servo circuit, and the clocks of the DSP 4 and the servo circuit 3 are set to the same clock (FIG. 2).
Clock switching).

Thereafter, as in the normal reproduction shown in the first embodiment, the audio data is stored in the audio memory 6 from the position shown in FIG. At this time, the speed at which the variable clock is changed is set in advance by a variable resistor (VR) (not shown) or the like, and the programmable frequency divider 1 is controlled by a control signal from the CPU 18 according to the value.
2 is controlled. By performing such control, the reproduction is performed such that the reading speed of the audio data is gradually increased from the low speed to the normal reproduction speed. The amount of readable audio data (margin data) stored in the audio memory 6 is smaller than in normal reproduction (Example 1), and becomes the margin data shown in FIG. The above-described reproduction provides the analog player with the same function as the state in which the player stops the turntable of the player being reproduced with his / her finger and stops his / her finger to start reproduction.

Embodiment 3 As shown in the flowchart of FIG.
The programmable frequency divider 12 is adjusted by the control signal from the CPU to set the same as the fixed clock 11, and the clock selector 1
5 and the basic clock selector 17 to switch the DSP
The reproduction is performed using the clock No. 4 as a variable clock. The readable margin data stored in the audio memory 6 (in the case where the reproduction is started in the first embodiment in FIG. 2 or in the case where the reproduction is started in the second embodiment in FIG. 2) is reproduced.
The programmable frequency divider 12 is controlled by the control signal from the PU 18 to gradually lower the variable clock frequency of the DSP 4 from the fixed clock frequency. At this time, the speed at which the variable clock is changed depends on the variable resistor (V
R) and the like, and the programmable frequency divider 12 is controlled by a control signal from the CPU 18 according to the value. By performing such control, the reproduction is performed such that the reading speed of the audio data is gradually reduced from the normal reproduction speed and stopped. This playback is performed by an analog player.
A function similar to that in which the turntable of the player being reproduced is stopped by holding it with a finger can be obtained.

(Embodiment 4) The clock selector 16 is connected to a fixed clock, audio data read from the optical disk 1 is converted into an analog signal by the D / A converter 10, and a changeover switch 20a is connected to connect the mix amplifier 9 to a normal amplifier. Output at playback speed. The voice memory 6 stores a certain phrase of a certain song (for example, drum voice data or the like) in advance. Clock selector 15
Is connected to the variable clock, and the basic clock selector 17 is connected to the variable LRCK from the programmable frequency divider 12 and the BCLK of the frequency divider 19 to separate the clock of the DSP 4 from the clock of the servo circuit 3. The reading speed of the audio data stored in the audio memory 6 can be changed by controlling the programmable frequency divider 12 with a control signal from the CPU 18, and can be changed from the reading speed of the audio data read from the optical disc 1. it can. Then, when a sampler operation button (not shown) is pressed,
Audio data (for example, audio data of a drum) stored in the audio memory 6 from the DSP 4 is converted into an analog signal by the D / A converter 8 and reproduced from the mix amplifier 9 through the connected switch 20b. Accordingly, the reproduction output of the audio data (for example, drum sound) stored in the audio memory 6 can be mixed with the reproduction output from the optical disk 1 and output, so that the reproduction is performed every time the sampler operation button is pressed. The rhythm can be driven into the music and the like, and the same function as the sampler can be obtained.

(Embodiment 5) When reproducing in Embodiment 4, as shown in the characteristic diagram of FIG.
A variable clock having an acceleration / deceleration characteristic, such as when an analog disk is turned by hand, is controlled by a control signal from the CPU 18 and output from the programmable frequency divider 12 to output the audio stored in the audio memory 6. DSP data
When the reproduction is started from 4, the same function as the pseudo scratch reproduction in the analog player can be obtained.

(Embodiment 6) As shown in the flowchart of FIG. 8, audio data is stored in the audio memory 6 by a control signal from the CPU 18, and the clock selector 15 and the basic clock selector 17 are switched to a variable clock to change the DSP 4 Is a variable clock. The control signal from the CPU 18 controls the programmable frequency divider 12 to start the reproduction by lowering the frequency of the variable clock of the DSP 4 from the frequency of the fixed clock, and then gradually increase the frequency of the clock. Then, when the address of the audio data stored in the audio memory 6 is approximately at the center of the recording capacity, the clock frequency is gradually lowered, and the DSP 4 is controlled to perform a fade-out when nearing the end of the memory of the audio memory 6. I do. Then, CPU1
The control signal from the DSP 8 controls the DSP 4 to perform fade-in, and then reads the address of the audio data stored in the audio memory 6 in reverse to start reproduction, and performs the same processing as the above-described reproduction. By repeating such control, it is possible to obtain the same function as scratch reproduction performed by manually moving the turntable back and forth with an analog disk.

[0019]

According to the present invention, the special reproduction performed by mechanical operation of the analog disk can be performed on the optical disk.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating an embodiment of the present invention.

FIG. 3 is a flowchart illustrating a first embodiment of the present invention.

FIG. 4 is a flowchart showing a first embodiment of the present invention.

FIG. 5 is a flowchart showing a second embodiment of the present invention.

FIG. 6 is a flowchart showing a third embodiment of the present invention.

FIG. 7 is a characteristic diagram showing Example 5 of the present invention.

FIG. 8 is a flowchart showing a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 optical pickup 3 servo circuit 4 DSP 5 digital filter 6 audio memory 7 digital filter 8 D / A converter 9 mix amplifier 10 D / A converter 11 fixed clock 12 programmable frequency divider 13 frequency divider 14 PLL 15 clock Selector 16 clock selector 17 basic clock selector 18 CPU 19 frequency divider

Claims (5)

(57) [Claims] 1. An optical disc player for reproducing a recording medium on which digital data is recorded at a sampling frequency FS, a fixed clock output means for outputting a clock corresponding to the sampling frequency FS, and a variable with respect to the sampling frequency FS. Variable clock output means for outputting a clock, first switching means and second switching means for switching between the variable clock output means and the fixed clock output means, and the recording with the clock selected by the first switching means. First reproducing means for reproducing and outputting digital data recorded on a medium, storage means for storing output data of the first reproducing means, and switching the digital data stored in the storage means to the second switching means A second reproducing means for reading out and outputting at a clock selected by the means, and a clock selected by the second switching means. Control means for independently controlling the lock and the clock selected by the first switching means;
An optical disc player comprising: a third switching means for selecting or combining the output of the reproducing means and the output of the second reproducing means and outputting the selected output. 2. The optical disk player according to claim 1, wherein the control means continuously converts the digital data stored in the storage means from a frequency lower than the sampling frequency FS to a clock corresponding to the sampling frequency FS. An optical disc player, wherein the optical disc player changes the read speed of the digital data. 3. The optical disc player according to claim 1, wherein the control means continuously converts the digital data stored in the storage means from the sampling frequency FS to a clock corresponding to a frequency lower than the sampling frequency FS. An optical disc player, wherein the optical disc player changes the read speed of the digital data. 4. The optical disk player according to claim 1, wherein the control means converts the digital data stored in the storage means from a frequency lower than the sampling frequency FS to a frequency substantially equal to the sampling frequency FS or a frequency higher than the sampling frequency FS. An optical disk player, wherein the variable clock is continuously changed to a clock corresponding to a frequency lower than the sampling frequency FS to control the reading speed of the digital data. 5. The optical disc player according to claim 1, wherein the control means converts the digital data stored in the storage means from a frequency lower than the sampling frequency FS to a frequency substantially equal to the sampling frequency FS or a frequency higher than the sampling frequency FS. After changing the variable clock, the digital data stored in the storage means is reversely reproduced to continuously change the variable clock to a clock corresponding to a frequency lower than the sampling frequency FS to reduce the reading speed of the digital data. An optical disk player for performing control.