System and method for processing audio frames

• US 7,739,105 B2
• Filed: 06/13/2003
• Issued: 06/15/2010
• Est. Priority Date: 06/13/2003
• Status: Active Grant

• Current Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Original Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Inventors: Zeng, Hong
• Primary Examiner(s): Dorvil, Richemond
• Assistant Examiner(s): GODBOLD, DOUGLAS
• Application Number:
  US10/461,095
• Publication Number:
  US 20040254785A1
• Time in Patent Office: 2,559 Days
• Field of Search: 704/200.1, 704/229, 704/228, 704/226, 704/200, 704/500
• US Class Current: 704/200.1
• CPC Class Codes: G10L 19/02 using spectral analysis, e.g. transform vocoders or subband vocoders

Abstract

In accordance with a specific implementation of the disclosure, a stream of audio frames is received and compressed using psycho-acoustical processing. The signal-to-mask ratio table generated by the psycho-acoustical algorithm is updated using only a portion of the received audio frames.

Claims

1. A method comprising:

receiving a first plurality of audio frames;

determining a predetermined number of audio frames to achieve a predetermined workload level of a data processor;

selecting the predetermined number of audio frames from the first plurality of audio frames to generate a first subset of audio frames, the first subset of audio frames comprising fewer audio frames than the first plurality of audio frames;

modifying a first cumulative audio frame signal-to-mask ratio using the first subset of audio frames and a weighting value to generate a second cumulative audio frame signal-to-mask ratio;

receiving a second plurality of audio frames after modifying the first cumulative audio frame signal-to-mask ratio;

compressing the second plurality of audio frames based upon the second cumulative audio frame signal-to-mask ratio;

selecting a predetermined number of audio frames from the second plurality of audio frames to generate a second subset of audio frames, the second subset comprising fewer audio frames than the second plurality of audio frames;

modifying the second cumulative audio frame signal-to-mask ratio using the second subset of audio frames and the weighting value to generate a third cumulative audio frame signal-to-mask ratio;

receiving a third plurality of audio frames after receiving the second plurality of audio frames; and

compressing the third plurality of audio frames based upon the third cumulative audio frame signal-to-mask ratio to generate a compressed audio data.

2. The method of claim 1, further comprising:

determining an audio frame bit allocation based upon the second cumulative audio frame signal-to-mask ratio.

3. The method of claim 1, further comprising:

setting the first cumulative audio frame signal-to-mask ratio to a predetermined value prior to receiving the first plurality of audio frames.

4. The method of claim 1, further comprising:

setting the first cumulative audio frame signal-to-mask ratio to a predetermined value, wherein the predetermined value is based upon a previously modified cumulative audio frame signal-to-mask ratio that has been stored.

5. The method of claim 1, further comprising:

setting the first cumulative audio frame signal-to-mask ratio to a predetermined value, wherein the predetermined value is selected based on an audio source.

6. The method of claim 1, wherein modifying the first cumulative audio frame signal-to-mask ratio using the first subset of audio frames and the weighting value to generate the second cumulative audio frame signal-to-mask ratio comprises:

determining a fourth audio frame signal-to-mask ratio using the first subset of audio frames; and

determining the second audio frame signal-to-mask ratio based on a weighted averaging of the first cumulative audio frame signal-to-mask ratio and the fourth audio frame signal-to-mask ratio.

7. The method of claim 1, wherein the predetermined workload level comprises a predetermined workload range for the data processor.

8. A system comprising:

means for receiving a first plurality of audio frames;

means for determining a predetermined number of audio frames to achieve a predetermined workload level of a data processor;

means for selecting the predetermined number of audio frames from the first plurality of audio frames to generate a first subset of audio frames, the first subset of audio frames comprising fewer audio frames than the first plurality of audio frames;

means for modifying a first cumulative audio frame signal-to-mask ratio using the first subset of audio frames and a weighting value to generate a second cumulative audio frame signal-to-mask ratio;

means for receiving a second plurality of audio frames after modifying the first cumulative audio frame signal-to-mask ratio;

means for compressing the second plurality of audio frames based upon the second cumulative audio frame signal-to-mask ratio;

means for selecting a predetermined number of audio frames from the second plurality of audio frames to generate a second subset of audio frames, the second subset comprising fewer audio frames than the second plurality of audio frames;

means for modifying the second cumulative audio frame signal-to-mask ratio using the second subset of audio frames and the weighting value to generate a third cumulative audio frame signal-to-mask ratio;

means for receiving a third plurality of audio frames after receiving the second plurality of audio frames; and

means for compressing the third plurality of audio frames based upon the third cumulative audio frame signal-to-mask ratio to generate a compressed audio data.

9. The system of claim 8, further comprising:

means for setting the first cumulative audio frame signal-to-mask ratio to a predetermined value prior to receiving the first plurality of audio frames.

10. The system of claim 8, further comprising:

means for setting the first cumulative audio frame signal-to-mask ratio to a predetermined value based on an audio source.

11. The system of claim 8, wherein:

the predetermined number of audio frames is based upon an available bandwidth of a data processor.

12. The system of claim 8, wherein the means for modifying the first cumulative audio frame signal-to-mask ratio using the first subset of audio frames and the weighting value to generate the second cumulative audio frame signal-to-mask ratio comprises:

means for determining a fourth audio frame signal-to-mask ratio using the first subset of audio frames; and

means for determining the second audio frame signal-to-mask ratio based on a weighted averaging of the first cumulative audio frame signal-to-mask ratio and the fourth audio frame signal-to-mask ratio.

13. The system of claim 8, wherein the predetermined workload level comprises a predetermined workload range for the data processor.

14. A method comprising:

receiving a first plurality of audio frames;

determining a first predetermined number of audio frames to achieve a predetermined workload level of a data processor at a first time;

selecting the first predetermined number of audio frames of the first plurality of audio frames to determine a subset of the first plurality of audio frames;

determining a first signal-to-mask ratio based on the subset of the first plurality of audio frames;

receiving a second plurality of audio frames;

compressing the second plurality of audio frames based on the first signal-to-mask ratio to generate a first compressed audio data;

determining a second predetermined number of audio frames to achieve the predetermined workload level of a data processor at a second time;

selecting the second predetermined number of audio frames of the second plurality of audio frames to determine a subset of the second plurality of audio frames based on a second available bandwidth of a data processor at a second time;

determining a second signal-to-mask ratio based on the subset of the second plurality of audio frames;

determining a third signal-to-mask ratio based on the first signal-to-mask ratio and the second signal-to-mask ratio;

receiving a third plurality of audio frames; and

compressing the third plurality of audio frames using the third signal-to-mask ratio to generate a second audio data.

15. The method of claim 14, wherein the predetermined workload level comprises a predetermined workload range for the data processor.