Signal processing apparatus and method, and transmission medium and recording medium therefor

• US 6,128,592 A
• Filed: 05/13/1998
• Issued: 10/03/2000
• Est. Priority Date: 05/16/1997
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Miyazaki, Satoshi, Tsutsui, Kyoya
• Primary Examiner(s): Dorvil, Richemond
• Application Number:
  US09/078,027
• Time in Patent Office: 874 Days
• Field of Search: 704/224, 704/200, 704/201, 704/500, 704/502, 704/504, 704/230, 704/222, 704/205, 704/206
• US Class Current: 704/224
• CPC Class Codes: G10L 19/0212 using orthogonal transformation

Abstract

A signal processing apparatus and method decodes codes generated by encoding decomposed frequency components, and combines frequency components obtained in the decoding to form a waveform signal. The apparatus and method further monitors a processing condition in the decoding, and controls a processed band of the waveform signal, formed in the combining, in accordance with the monitoring result obtained in the monitoring.

Claims

1. A signal processing apparatus comprising:

decoding means for decoding codes representative of encoded frequency components, to obtain, as a result, frequency components;

combining means for combining the frequency components obtained by said decoding means to form a waveform signal;

monitor means for monitoring a processing condition of said decoding means; and

control means for controlling a number of processed bands of the waveform signal formed by said combining means in accordance with a monitoring result of said monitor means.

2. A signal processing apparatus according to claim 1, wherein, when the decoding by said decoding means is delayed from a reference, said control means implements control for omitting the processing of a high band of the waveform signal.

3. A signal processing apparatus according to claim 1, wherein, when the combining by said combining means is delayed from a reference, said control means implements control for omitting the processing of a high band of the waveform signal.

4. A signal processing apparatus according to claim 1, wherein said control means implements control for changing the number of processed bands of the waveform signal in a plurality of stages in accordance with the monitoring result of said monitor means.

5. A signal processing apparatus according to claim 4, wherein, when said control means changes the number of processed bands from a first stage to a second stage in accordance with the monitoring result of said monitor means, said control means implements control for executing the processing between the first and second stages within at least a predetermined duration.

6. A signal processing apparatus according to claim 1, wherein said combining means comprises inverse-spectral-transform means for implementing the inverse spectral transform of an input signal, and band-combining means for combining outputs from said inverse-spectral-transform means.

7. A signal processing apparatus according to claim 1, wherein said monitor means monitors the time necessary for decoding a predetermined amount of input codes.

8. A signal processing apparatus according to claim 1, further comprising a processor for controlling various operations, wherein said monitor means monitors the load of said processor.

9. A signal processing method comprising the steps of:

decoding codes representative of encoded frequency components, to obtain, as a result, frequency components;

combining the frequency components obtained in the decoding step to form a waveform signal;

monitoring a processing condition in the decoding step; and

controlling a number of processed bands of the waveform signal, formed in the combining step, in accordance with a monitoring result obtained in the monitoring step.

10. A signal processing method according to claim 9, wherein, when the decoding in the decoding step is delayed from a reference, the controlling step implements control for omitting the processing of a high band of the waveform signal.

11. A signal processing method according to claim 9, wherein, when the combining by the combining step is delayed from a reference, the controlling step implements control for omitting a processing of the high band of the waveform signal.

12. A signal processing method according to claim 9, wherein the controlling step implements control for changing the number of processed bands of the waveform signal in a plurality of stages in accordance with the monitoring result of the monitoring step.

13. A signal processing method according to claim 12, wherein, when the controlling step changes the number of processed bands from a first stage to a second stage in accordance with the monitoring result of the monitoring step, the controlling step implements control for executing the processing between the first and second stages within at least a predetermined duration.

14. A signal processing method according to claim 9, wherein the combining step comprises the steps of implementing the inverse spectral transform of an input signal, and combining outputs from the inverse-spectral-transform step.

15. A signal processing method according to claim 9, wherein the monitoring step monitors the time necessary for decoding a predetermined amount of input codes.

16. A signal processing method according to claim 9, wherein the monitoring step monitors the load of a processor for controlling various operations.

17. A signal processing apparatus comprising:

decomposing means for decomposing an input signal into frequency-component signals;

encoding means for encoding the frequency-component signals decomposed by said decomposing means;

monitor means for monitoring a processing condition of said decomposing means; and

control means for controlling a number of processed bands of the frequency component signals formed by said decomposing means in accordance with a monitoring result of said monitor means.

18. A signal processing apparatus according to claim 17, wherein, when the decomposing by said decomposing means is delayed from a reference, said control means implements control for omitting the processing of a high band of the waveform signal.

19. A signal processing apparatus according to claim 17, wherein, when the decomposing by said decomposing means is delayed from a reference, said control means implements control for omitting the processing of a high band of the waveform signal.

20. A signal processing apparatus according to claim 17, wherein said control means implements control for changing the number of processed bands of the waveform signal in a plurality of stages in accordance with the monitoring result of said monitor means.

21. A signal processing apparatus according to claim 20, wherein, when said control means changes the number of processed bands from a first stage to a second stage in accordance with the monitoring result of said monitor means, said control means implements control for executing the processing between the first and second stages within at least a predetermined duration.

22. A signal processing apparatus according to claim 17, wherein said decomposing means comprises means for dividing the input signal into signals corresponding to frequency bands, and transform means for implementing a spectral transform of the divided frequency-band signals.

23. A signal processing apparatus according to claim 17, wherein said monitor means monitors the time necessary for encoding a predetermined amount of input codes.

24. A signal processing apparatus according to claim 17, further comprising a processor for controlling various operations, wherein said monitor means monitors the load of the processor.

25. A signal processing method comprising the steps of:

decomposing an input signal into frequency-component signals;

encoding the frequency-component signals formed by the decomposing step;

monitoring a processing condition of the encoding step; and

controlling a number of processed bands of the frequency component signals formed by the decomposing step in accordance with a monitoring result of the monitoring step.

26. A signal processing method according to claim 25, wherein, when a processing by the encoding step is delayed from a reference, the controlling step implements control for omitting the processing of a high band of the waveform signal.

27. A signal processing method according to claim 25, wherein, when a processing by the decomposing step is delayed from a reference, the controlling step implements control for omitting the processing of a high band of the waveform signal.

28. A signal processing method according to claim 25, wherein the controlling step implements control for changing the number of processed bands of the waveform signal in a plurality of stages in accordance with the monitoring result of the monitoring step.

29. A signal processing method according to claim 28, wherein, when the controlling step changes the number of processed bands from a first stage to a second stage in accordance with the monitoring result of the monitoring step, the controlling step implements control for executing the processing between the first and second stages within at least a predetermined duration.

30. A signal processing method according to claim 25, wherein the decomposing step comprises the steps of dividing the input signal into signals corresponding to frequency bands, and implementing a spectral transform of the divided frequency-band signals.

31. A signal processing method according to claim 25, wherein the monitoring step monitors the time necessary for encoding a predetermined amount of input codes.

32. A signal processing method according to claim 25, wherein the monitoring step monitors the load of a processor for controlling various operations.

33. A transmission medium for transmitting a program comprising the steps of:

decoding codes representative of encoded frequency components, to obtain, as a result, frequency components;

combining the frequency components obtained in the decoding step to form a waveform signal;

monitoring a processing condition in the decoding step; and

controlling a number of processed bands of the waveform signal, formed in the combining step, in accordance with a monitoring result obtained in the monitoring step.

34. A transmission medium for transmitting a program comprising the steps of:

decomposing an input signal into frequency-component signals;

encoding the frequency-component signals decomposed by the decomposing step;

monitoring a processing condition of the decomposing step; and

controlling a number of processed bands of frequency component signals formed by the decomposing step in accordance with a monitoring result of the monitoring step.

35. A recording medium for holding codes generated by implementing signal processing, said processing comprising the steps of:

decomposing an input signal into frequency-component signals;

encoding the frequency-component signals formed by the decomposing step;

monitoring a processing condition of the encoding step;

controlling a number of processed bands of the frequency component signals formed by the decomposing step in accordance with a monitoring result of the monitoring step; and

recording the encoded frequency-component signals on said recording medium.