Disk recording and sound reproducing device using pitch change and timing adjustment

• US 5,793,739 A
• Filed: 09/12/1997
• Issued: 08/11/1998
• Est. Priority Date: 07/15/1994
• Status: Expired due to Term

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Honda, Kazuhiko, Tanaka, Kei
• Primary Examiner(s): Psitos, Aristotelis M.
• Assistant Examiner(s): HOLDER, REGINA NEAL
• Application Number:
  US08/928,632
• Time in Patent Office: 333 Days
• Field of Search: 84/601, 84/602, 84/609, 84/612
• US Class Current: 369/124.14
• CPC Class Codes: G10H 1/0041 in coded form
• CPC Class Codes: G10H 1/02 Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
• CPC Class Codes: G10H 2240/195 Reed-solomon error detection or correction, i.e. by considering the message symbols as polynomial coefficients
• CPC Class Codes: G10H 2250/575 Adaptive MDCT-based compression, e.g. using a hybrid subband-MDCT, as in ATRAC non adaptive MDCT G10H2250/225
• CPC Class Codes: G10H 2250/631 Waveform resampling, i.e. sample rate conversion or sample depth conversion waveform decimation G10H2250/611

Abstract

In a disk recording and sound reproducing device, a disk is intermittently accessed for data read out to write the disk readout data into a memory. The written data in the memory are continually read out and expanded to output the expanded data as playback data signals. Data to be recorded are continually written into the memory, during which time the data to be recorded are intermittently read out from the memory 10 to be demodulated so as to record the demodulated data onto the disk. A clock controller, in accordance with a pitch change instruction, varies the rate of data readout from the memory (in reproduction) or the rate of data writing into the memory (in recording). Corresponding to the data readout or writing rate, a memory controller controls the intervals at which the data are read out from the disk (in reproduction) or the intervals at which the data are recorded onto the disk (in recording). Further, in accordance with a timing shift instruction, a system controller varies the intervals between the intermittent data writing into the memory so as to selectively change the reproduction timing of a specific portion of the data.

Claims

1. A disk reproducing device comprising:

disk access means for accessing a disk to read out data therefrom at a reproducing speed;

demodulation means for demodulating the data read out from the disk by said disk access means;

storage means for temporarily storing the data demodulated by said demodulation means;

output means for outputting the demodulated data from said storage means as a playback data signal; and

control means for intermittently writing the demodulated data into said storage means at a fixed first rate, during which time said control means continually reads out the demodulated data from said storage means at a second rate that is lower than the fixed first rate, and, on the basis of a pitch change instruction, varies said second rate at which the demodulated data are read out from said storage means and a writing period in which the demodulated data are intermittently written into said storage means at said fixed first rate.

wherein said control means varies said second rate and said writing period on the basis of the pitch change instruction without adjusting the reproducing speed.

2. A disk recording device comprising:

storage means for temporarily storing data to be recorded;

modulation means for modulating the data read out from said storage means;

writing means for writing the data modulated by said modulation means onto a disk at a recording speed; and

control means for continually writing the data to be recorded into said storage means at a first predetermined rate, during which time said control means intermittently reads out the written data from said storage means at second fixed rate that is higher than said first predetermined rate, and, on the basis of a pitch change instruction, varies said first predetermined rate at which the data to be recorded are written into said storage means and a readout period in which the written data are intermittently read out from said storage means into said modulation means at said second fixed rate,

wherein said control means varies said first predetermined rate and said readout period on the basis of the pitch change instruction without adjusting the recording speed.

3. A disk reproducing device comprising:

disk access means for accessing a disk to read out data therefrom;

demodulation means for demodulating the data read out from the disk by said disk access means;

storage means for temporarily storing the data demodulated by said demodulation means;

output means for outputting the demodulated data from said storage means as a playback data signal; and

control means for intermittently writing the demodulated data into said storage means at a fixed first rate, during which time said control means continually reads out the demodulated data from said storage means at a second rate that is lower than the fixed first rate, and, on the basis of a timing shift instruction, varies writing intervals at which the demodulated data are intermittently written into said storage means at said fixed first rate to thereby change reproduction timing of the data such that said variation of the writing intervals creates mute regions in the playback data signal.

4. A disk reproducing device in accordance with claim 3, wherein the second rate is varied such that the timing shift is performed without a change in key.

5. A disk reproducing device comprising:

a disk access mechanism that accesses a disk to read out data stored on the disk at a reproducing speed;

a demodulation circuit that demodulates the data read out from the disk by the disk access mechanism;

a storage device that temporarily stores the data demodulated by the demodulation circuit;

an output circuit that outputs the demodulated data from the storage device as a playback data signal; and

a control circuit that intermittently writes the demodulated data into the storage device at a fixed first rate, during which time the control circuit also continually reads out the demodulated data from the storage device at a second rate that is lower than the fixed first rate, and, on the basis of a pitch change instruction, varies the second rate at which the demodulated data are read out from the storage device and a writing period in which the demodulated data are intermittently written into the storage device at the fixed first rate.

wherein said control circuit varies said second rate and said writing period on the basis of the pitch change instruction without adjusting the reproducing speed.

6. A disk recording device comprising:

a storage device that temporarily stores data to be recorded;

a modulation circuit that modulates the data read out from the storage device;

a writing mechanism that writes the data modulated by the modulation circuit onto a disk at a recording speed; and

a control circuit that continually writes the data to be recorded into the storage device at a first predetermined rate, during which time the control circuit intermittently reads out the written data from the storage means at second fixed rate that is higher than the first predetermined rate, and, on the basis of a pitch change instruction, varies the first predetermined rate at which the data to be recorded are written into the storage device and a readout period in which the written data are intermittently read out from the storage means into the modulation circuit at the second fixed rate.

wherein said control circuit varies said first predetermined rate and said readout period on the basis of the pitch change instruction without adjusting the recording speed.

7. A disk reproducing device comprising:

a disk access mechanism that accesses a disk to read out data stored on the disk;

a demodulation circuit that demodulates the data read out from the disk by the disk access mechanism;

a storage device that temporarily stores the data demodulated by the demodulation circuit;

an output circuit that outputs the demodulated data from the storage device as a playback data signal; and

a control circuit that intermittently writes the demodulated data into the storage device at a fixed first rate, during which time the control circuit continually reads out the demodulated data from the storage means at a second rate that is lower than the fixed first rate, and, on the basis of a timing shift instruction, varies writing intervals at which the demodulated data are intermittently written into the storage device at the fixed first rate to thereby change reproduction timing of the data such that said variation of the writing intervals creates mute regions in the playback data signal.

8. A disk reproducing device in accordance with claim 7, wherein the second rate is varied such that the timing shift is performed without a change in key.

9. A method of reproducing sound from data on a disk, the method comprising the steps of:

accessing the disk to read out data stored on the disk at a reproducing speed;

demodulating the accessed data read out from the disk;

temporarily storing the demodulated in a storage device;

outputting the demodulated data from the storage device as a playback data signal;

intermittently writing the demodulated data into the storage device at a fixed first rate;

continually reading out the demodulated data from the storage device at a second rate that is lower than the fixed first rate, while intermittently writing the demodulated data into the storage device; and

varying the second rate at which the demodulated data are read out from the storage device and a writing period in which the demodulated data are intermittently written into the storage device at the fixed first rate on the basis of a pitch change instruction;

wherein said second rate and the said writing period are varied on the basis of the pitch change instruction without adjusting the reproducing speed.

10. A method of recording data for sound reproduction on a disk, the method comprising the steps of:

continually and temporarily storing data to be recorded into a storage device at a first predetermined rate;

reading out the data from the storage device;

modulating the data read out from the storage device;

writing the modulated data onto the disk at a recording speed;

intermittently reading out and writing the modulated data onto the disk at second fixed rate that is higher than the first predetermined rate, while continually storing the data to be recorded in the storage device; and

varying the first predetermined rate at which the data to be recorded are written into the storage device and a readout period in which the written data are intermittently read out from the storage device and modulated at the second fixed rate on the basis of a pitch change instruction,

wherein said first predetermined rate and said readout period are varied on the basis of the pitch change instruction without adjusting the recording speed.

11. A method of reproducing sound from data on a disk, the method comprising the steps of:

accessing the disk to read out the data stored on the disk at a reproducing speed;

demodulating the accessed data read out from the disk;

temporarily storing the demodulated data in a storage device;

outputting the demodulated data from the storage means as a playback data signal;

intermittently writing the demodulated data into the storage device at a fixed first rate;

continually reading out the demodulated data from the storage device at a second rate that is lower than the fixed first rate, while intermittently writing the demodulated data into the storage device; and

varying the second rate at which the demodulated data are read out from the storage device and a writing period in which the demodulated data are intermittently written into the storage device at the fixed first rate on the basis of a timing shift instruction such that said variation of the writing period creates mute regions in the playback data signal.

12. A method in accordance with claim 11, wherein the second rate is varied such that the timing shift is performed without a change in key.