Coding latency reductions during transmitter quieting

• US 9,112,618 B2
• Filed: 07/01/2010
• Issued: 08/18/2015
• Est. Priority Date: 07/02/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Raveendran, Vijayalakshmi R.
• Primary Examiner(s): Werner, David N
• Application Number:
  US12/829,302
• Publication Number:
  US 20110002378A1
• Time in Patent Office: 1,874 Days
• Field of Search: 375/240.26
• US Class Current: 1/1
• CPC Class Codes: H04H 20/40 Arrangements for broadcast specially adapted for accumulation-type receivers
• CPC Class Codes: H04H 20/42 Arrangements for resource management
• CPC Class Codes: H04H 20/423 Transmitter side
• CPC Class Codes: H04H 20/426 Receiver side
• CPC Class Codes: H04H 60/41 for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
• CPC Class Codes: H04H 60/51 of receiving stations
• CPC Class Codes: H04H 60/80 characterised by transmission among terminal devices
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/31 in the temporal domain
• CPC Class Codes: H04N 19/587 involving temporal sub-sampling or interpolation, e.g. decimation or subsequent interpolation of pictures in a video sequence

Abstract

A method comprises encoding and modulating a first set of frames such that a latency associated with demodulating and decoding the first set of frames is less than a first time interval, encoding and modulating a second set of frames such that a required latency associated with demodulating and decoding the first set of frames is less than a second time interval, transmitting the first set of frames and the second set of frames via a transmitter, and blanking the transmitter during a null interval associated with transmitting the second set of frames, wherein the null interval and the second time interval are less than or equal to the first time interval.

Claims

1. A method comprising:

encoding and modulating a first set of frames such that a latency associated with demodulating and decoding the first set of frames is less than a first time interval;

encoding and modulating a second set of frames such that a required latency associated with demodulating and decoding the first set of frames is less than a second time interval;

transmitting the first set of frames and the second set of frames via a transmitter; and

regularly and periodically blanking the transmitter during a null interval associated with transmitting the second set of frames, wherein the sum of the null interval and the second time interval is less than or equal to the first time interval, wherein blanking the transmitter during the null interval comprises refraining from transmitting data via the transmitter during the null interval.

2. The method of claim 1, wherein the first time interval is less than approximately 100 milliseconds, the null interval is approximately 40 milliseconds and the second time interval is less than approximately 60 milliseconds.

3. The method of claim 1, wherein encoding and modulating the second set of frames includes encoding the second set of frames differently than the first set of frames to reduce decoding latency of the second set of frames by an amount sufficient to account for the null interval.

4. The method of claim 3, further comprising:

encoding the first set of frames to include I-frames, P-frames and B-frames; and

encoding the second set of frames to include I-frames and P-frames without any B-frames.

5. The method of claim 1, wherein blanking the transmitter during the null interval further comprises performing white space sensing during the null interval.

6. A device comprising:

an encoder and a modulator, wherein the encoder and the modulator encode and modulate a first set of frames such that a latency associated with demodulating and decoding the first set of frames is less than a first time interval, and wherein the encoder and the modulator encode and modulate a second set of frames such that a required latency associated with demodulating and decoding the first set of frames is less than a second time interval; and

a transmitter that transmits the first set of frames and the second set of frames, wherein the transmitter regularly and periodically blanks during a null interval associated with transmitting the second set of frames, wherein the sum of the null interval and the second time interval is less than or equal to the first time interval, wherein to blank during the null interval, the transmitter refrains from transmitting data via the transmitter during the null interval.

7. The device of claim 6, wherein the first time interval is less than approximately 100 milliseconds, the null interval is approximately 40 milliseconds and the second time interval is less than approximately 60 milliseconds.

8. The device of claim 6, wherein the encoder and the modulator encode and modulate the second set of frames differently than the first set of frames to reduce decoding latency of the second set of frames by an amount sufficient to account for the null interval.

9. The device of claim 8, wherein the encoder:

encodes the first set of frames to include I-frames, P-frames and B-frames; and

encodes the second set of frames to include I-frames and P-frames without any B-frames.

10. The device of claim 6, further comprising a channel identifier that performs white space sensing during the null interval.

11. A device comprising:

means for encoding and modulating a first set of frames such that a latency associated with demodulating and decoding the first set of frames is less than a first time interval;

means for encoding and modulating a second set of frames such that a required latency associated with demodulating and decoding the first set of frames is less than a second time interval,

means for transmitting the first set of frames and the second set of frames via a transmitter; and

means for regularly and periodically blanking the transmitter during a null interval associated with transmitting the second set of frames, wherein the sum of the null interval and the second time interval is less than or equal to the first time interval, wherein the means for blanking the transmitter during the null interval comprises means for refraining from transmitting data via the transmitter during the null interval.

12. The device of claim 11, wherein the first time interval is less than approximately 100 milliseconds, the null interval is approximately 40 milliseconds and the second time interval is less than approximately 60 milliseconds.

13. The device of claim 11, wherein the means for encoding and modulating the second set of frames includes means for encoding the second set of frames differently than the first set of frames to reduce decoding latency of the second set of frames by an amount sufficient to account for the null interval.

14. The device of claim 13, further comprising:

means for encoding the first set of frames to include I-frames, P-frames and B-frames; and

means for encoding the second set of frames to include I-frames and P-frames without any B-frames.

15. The device of claim 11, wherein the means for blanking the transmitter during the null interval further comprises means for performing white space sensing during the null interval.

16. A computer-readable storage medium comprising instructions that upon execution cause one or more processors to:

encode and modulate a first set of frames such that a latency associated with demodulating and encoding the first set of frames is less than a first time interval;

encode and modulate a second set of frames such that a required latency associated with demodulating and decoding the first set of frames is less than a second time interval;

transmit the first set of frames and the second set of frames via a transmitter; and

regularly and periodically blank the transmitter during a null interval associated with transmitting the second set of frames, wherein the sum of the null interval and the second time interval is less than or equal to the first time interval, wherein the instructions that cause the processor to blank the transmitter during the null interval further cause the processor to refrain from transmitting data via the transmitter during the null interval.

17. The computer-readable storage medium of claim 16, wherein the first time interval is less than approximately 100 milliseconds, the null interval is approximately 40 milliseconds and the second time interval is less than approximately 60 milliseconds.

18. The computer-readable storage medium of claim 16, wherein the instructions cause the one or more processors to encode the second set of frames differently than the first set of frames to reduce decoding latency of the second set of frames by an amount sufficient to account for the null interval.

19. The computer-readable storage medium of claim 18, wherein the instructions cause the one or more processors to

encode the first set of frames to include I-frames, P-frames and B-frames;

and

encode the second set of frames to include I-frames and P-frames without any B-frames.

20. The computer-readable storage medium of claim 16, wherein the instructions that cause the one or more processors to blank the transmitter during the null interval further cause the one or more processors to perform white space sensing during the null interval.