JP2002288935A - Digital audio disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the play back sound approaching to the scratching playback sound of an analog disk in a digital audio disk player. SOLUTION: The digital audio disk player is provided with a storage means for storing digital audio data, a specifying means for specifying the read direction and read speed of the digital audio data, a frequency characteristic adjusting means for adjusting the frequency characteristic of the digital audio data, and a control means for controlling the reading out direction and read speed of the digital audio data stored in the storage means based on the read direction and speed specified by the specifying means to control the adjusting amount of the frequency characteristic adjusting means based on the difference between the read speed specified by the specifying means and the read speed before being specified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio disc reproducing apparatus capable of performing a variable operation of a reproducing speed of digital audio data.

[0002]

2. Description of the Related Art A so-called disc jockey (DJ) disc for editing and reproducing audio data such as music digitally recorded on the disc in a dance hall, disco or the like while variably controlling a reproduction speed thereof. The playback device needs a function of editing music and the like and continuously playing back the edited music. Using an analog player that plays back analog-recorded discs, an operator places a needle on the analog disc and quickly turns the turntable in the forward and reverse directions by hand to produce a rubbing sound. is there.

[0003] In the scratch reproduction, the reproduction speed changes according to the speed of turning the turntable by hand, and at this time, the contact state between the needle and the analog disk changes to generate a unique rubbing sound. When performing scratch reproduction by a disk reproducing apparatus that reproduces audio data from a digitally recorded CD (Compact Disc) or the like, the audio data is stored in a memory and the reading speed from the memory is changed.

[0004]

When scratch playback is performed by a disk playback apparatus that plays back a digitally recorded disk, the playback speed of the digital audio data in accordance with the scratch playback operation is changed by changing the read speed of the digital audio data from the memory. Although it could be changed, it was not possible to reproduce a rubbing sound such as a scratch reproduction sound of an analog disk. In the scratch reproduction of an analog disk, the frequency of the reproduction sound increases when the reproduction speed is increased, and the frequency of the reproduction sound decreases when the reproduction speed is decreased. The problem to be solved by the present invention is to provide a digital audio disc reproducing apparatus in which the frequency of a reproduced sound is varied in accordance with a variable operation of a reproducing speed to obtain a reproduced sound that is intuitively approximated to a scratch reproduced sound of an analog disk. It is in.

[0005]

According to a first aspect of the present invention, there is provided a digital audio disk reproducing apparatus for reproducing a disk on which digital audio data is recorded. Means, a designating means for designating a reading direction and a reading speed of digital audio data, a frequency characteristic adjusting means for adjusting a frequency characteristic of digital audio data, and reading and writing of the storage means, and designated by the designating means. Controlling the reading direction and the reading speed of the digital audio data stored in the storage means based on the read direction and the reading speed, and controlling the frequency based on the difference between the reading speed specified by the specifying means and the reading speed before the specification. Adjustment amount of characteristic adjustment means In which a control means for controlling.

According to a second aspect of the present invention, there is provided a digital audio disk reproducing apparatus for reproducing a disk on which digital audio data is recorded, wherein a storage means for storing the digital audio data; Designation means for designating the read direction and read speed of the digital audio data, pitch adjustment means for adjusting the pitch of digital audio data, reading and writing of the storage means, and based on the read direction and the read speed designated by the designation means. Controlling the reading direction and reading speed of the digital audio data stored in the storage means, and controlling the adjustment amount of the pitch adjusting means based on the difference between the reading speed designated by the designation means and the reading speed before designation. With control means .

[0007]

FIG. 1 is a block diagram showing the configuration of an embodiment of a digital audio disc reproducing apparatus according to the present invention. The disk 1 is driven to rotate by a spindle motor 2. As the disc 1, a CD (Compact Disc) on which digital audio data is recorded is used.

The pickup 3 irradiates a laser to the disk 1 which is driven to rotate, and detects audio data recorded as pits on the disk 1 by reflected light from the disk 1.

The servo control unit 4 controls the rotation of the spindle motor 2, the focus control of the optical system of the pickup 3,
It performs tracking control and the like. The rotation speed of the spindle motor 2 is controlled by the servo controller 4 using a synchronization signal detected from the disk 1 by the pickup 3. The demodulation unit 5 converts the audio data detected by the pickup 3 into an EFM (Eight to Fourteen Modulat
ion) demodulated.

The memory control / output control unit 6 includes a memory (R
It controls reading / writing of an AM (Random Access Memory) 7, and stores audio data from the demodulation unit 5 in the RAM 7.

The frequency characteristic adjusting section 8 attenuates or amplifies a high frequency band or a low frequency band of audio data read out from the RAM 7 via the memory control / output control section 6. The DA converter (D / A) / amplifier 9 converts the digital audio data from the frequency characteristic adjuster 8 into an analog audio signal, amplifies it, and outputs it to the output terminal 10.

A clock control unit 11 inputs a clock signal for adjusting a reproduction speed to a memory control / output control unit 6, a frequency characteristic adjustment unit 8, and a D / A / amplifier 9. The control microcomputer (microcomputer) 12 controls the servo control unit 4, the demodulation unit 5, the memory control / output control unit 6, and the frequency characteristic adjustment unit 8. An operation / display unit 13 for performing operation input to the microcomputer 12 and displaying from the microcomputer 12 is connected to the microcomputer 12. The operation / display unit 13 includes operation buttons, a display, and the like.

When the disk 1 is reproduced, audio data detected by the pickup 3 from the disk 1 is transmitted to a demodulator 5, a memory control / output controller 6, a RAM 7,
The signal is output to an output terminal 10 via a frequency characteristic adjustment unit 8 and a D / A / amplifier 9.

When performing the scratch reproduction, the user performs a scratch reproduction operation on the operation / display unit 13. The operation / display unit 13 includes a rotary operator called a jog dial for performing a scratch reproduction operation.

The microcomputer 12 detects the rotation speed and the rotation direction input by operating the jog dial, and reproduces the data in the memory control / output control unit 6, the frequency characteristic adjustment unit 8, and the D / A amplifier 9 by the clock control unit 12. Sends a clock signal that changes the speed. Further, the microcomputer 12 stores data on the rotation direction of the jog dial in the memory control / output control unit 6.
Send to

The memory control / output control unit 6 stores a RAM 7 based on the clock signal and the rotation direction of the jog dial.
It controls the speed and direction in which audio data is read out of the RAM, and outputs the audio data stored in the RAM 7 to the frequency characteristic adjustment unit 8.

The frequency characteristic adjusting unit 8 includes the clock control unit 1
When the frequency of the clock signal output by the second unit 2 is low, the level of the high frequency band component of the audio data is reduced. Here, the level of the low frequency band may be increased. The amount of level adjustment of the frequency characteristic adjustment unit 8 is made proportional to the amount of change in the frequency of the clock signal.

The frequency characteristic adjusting unit 8 includes the clock control unit 1
When the frequency of the clock signal output by the second unit 2 is high, the level of the low frequency band component is increased. Here, the level of the high frequency band may be lowered. The level adjustment amount of the frequency characteristic adjustment unit 8 is made proportional to the amount of change in the frequency of the clock signal.

By the processing of the frequency characteristic adjusting section 8, the audio signal level of the changed frequency band component changes in addition to the change of the frequency of the audio signal to be reproduced due to the change of the reproduction speed. A reproduction sound close to the scratch reproduction sound of the disc can be obtained.

A pitch adjusting section instead of the frequency characteristic adjusting section 8
(Key controller). The pitch adjuster lowers the pitch when the frequency of the clock signal is low, and raises the pitch when the frequency of the clock signal is high. The adjustment amount of the pitch is proportional to the change amount of the frequency of the clock signal. When the pitch is lowered, the playback speed may be perceived as being slower than it actually is.When the pitch is raised, the playback speed may be perceived as being faster than the actual speed. it can.

[0021]

According to the digital audio disk reproducing apparatus of the present invention, the frequency change of the audio signal to be reproduced and the audio signal level of the changed frequency band component are adjusted in accordance with the variable operation of the reproduction speed. A reproduction sound closer to the scratch reproduction sound of the analog disk can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a digital audio disc reproducing apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 disk 2 spindle motor 3 pickup 4 servo control unit 5 demodulation unit 6 memory control / output control unit 7 memory (RAM) 8 data processing unit 9 DA conversion unit (D / A) / amplifier 10 output terminal 11 clock control unit 12 control Microcomputer (microcomputer) 13 Operation / display unit

Claims (2)

[Claims] 1. A digital audio disk reproducing apparatus for reproducing a disk on which digital audio data is recorded, a storage means for storing digital audio data, a specifying means for specifying a reading direction and a reading speed of digital audio data, Frequency characteristic adjusting means for adjusting the frequency characteristic of audio data; reading and writing of the storage means; and reading of digital audio data stored in the storage means based on a read direction and a read speed designated by the designation means. A digital audio system comprising: a control unit that controls a direction and a read speed, and controls an adjustment amount of the frequency characteristic adjustment unit based on a difference between a read speed designated by the designation unit and a read speed before designation. Disc playback device. 2. A digital audio disk reproducing apparatus for reproducing a disk on which digital audio data is recorded, a storage means for storing digital audio data, a designating means for designating a reading direction and a reading speed of digital audio data, Pitch adjusting means for adjusting the pitch of audio data; reading and writing of the storage means; and a reading direction of digital audio data stored in the storage means based on a reading direction and a reading speed specified by the specifying means. A digital audio disc reproducing apparatus, comprising: a control means for controlling a reading speed and controlling an adjustment amount of said pitch adjusting means based on a difference between a reading speed specified by said specifying means and a reading speed before specification. .