High-band signal generation

Patent metadata

Field	Value
Publication number	US-2016372125-A1
Application number	US-201615164619-A
Country	US
Kind code	A1
Filing date	May 25, 2016
Priority date	Jun 18, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

A device for signal processing includes a receiver and a high-band excitation signal generator. The receiver is configured to receive a parameter associated with a bandwidth-extended audio stream. The high-band excitation signal generator is configured to determine a value of the parameter. The high-band excitation signal generator is also configured to select, based on the value of the parameter, one of target gain information associated with the bandwidth-extended audio stream or filter information associated with the bandwidth-extended audio stream. The high-band excitation signal generator is further configured to generate a high-band excitation signal based on the one of the target gain information or the filter information.

First claim

What is claimed is:

1 . A device for signal processing comprising:
a receiver configured to receive a parameter associated with a bandwidth-extended audio stream; and a high-band excitation signal generator configured to:
determine a value of the parameter;
select, based on the value of the parameter, one of target gain information associated with the bandwidth-extended audio stream or filter information associated with the bandwidth-extended audio stream; and
generate a high-band excitation signal based on the one of the target gain information or the filter information.

2 . The device of claim 1 , wherein the high-band excitation signal generator is further configured to select the target gain information when the parameter has a first value.

3 . The device of claim 1 , wherein the target gain information includes high-band reference gain information, temporal sub-frame residual gain shape information, or both.

4 . The device of claim 1 , wherein the target gain information is received by the receiver from an encoder.

5 . The device of claim 1 , wherein the high-band excitation signal generator is further configured to select the filter information when the parameter has a second value.

6 . The device of claim 1 , wherein the filter information is received by the receiver from an encoder.

7 . The device of claim 1 , wherein the filter information indicates filter coefficients of a finite impulse response (FIR) filter.

8 . The device of claim 1 , wherein the high-band excitation signal generator is further configured to, when the parameter has a second value:
select the filter information; determine a filter based on the filter information; and generate the high-band excitation signal based on application of the filter to a first high-band excitation signal.

9 . The device of claim 8 , wherein the first high-band excitation signal is generated based on harmonically extending a low-band excitation signal in a time-domain.

10 . The device of claim 8 , wherein the first high-band excitation signal is combined with a noise signal prior to the application of the filter.

11 . The device of claim 8 , wherein the application of the filter to the first high-band excitation signal generates a filtered signal, wherein the high-band excitation signal is generated by combining the filtered signal with another signal that is based on a noise signal.

12 . The device of claim 8 , wherein the filter comprises a finite impulse response (FIR) filter.

13 . The device of claim 1 , further comprising:
an antenna coupled to the receiver, wherein the receiver is configured to receive an encoded audio signal; a demodulator coupled to the receiver, the demodulator configured to demodulate the encoded audio signal; and a decoder coupled to the processor, the decoder configured to decode the encoded audio signal, wherein the encoded audio signal corresponds to the bandwidth-extended audio stream, and wherein the processor is coupled to the demodulator.

14 . The device of claim 13 , wherein the receiver, the demodulator, the processor, and the decoder are integrated into a mobile communication device.

15 . The device of claim 13 , wherein the receiver, the demodulator, the processor, and the decoder are integrated into a base station, the base station further comprising a transcoder that includes the decoder.

16 . The device of claim 1 , wherein the receiver and the high-band excitation signal generator are integrated into a media playback device or a media broadcast device.

17 . A signal processing method comprising:
receiving, at a device, a parameter associated with a bandwidth-extended audio stream; determining, at the device, a value of the parameter; selecting, based on the value of the parameter, one of target gain information associated with the bandwidth-extended audio stream or filter information associated with the bandwidth-extended audio stream; and generating, at the device, a high-band excitation signal based on the one of the target gain information or the filter information.

18 . The method of claim 17 , further comprising receiving the target gain information from an encoder, and selecting the target gain information when the parameter has a first value.

19 . The method of claim 17 , further comprising selecting the filter information when the parameter has a second value.

20 . The method of claim 17 , wherein the device comprises a media playback device or a media broadcast device.

21 . The method of claim 17 , wherein the device comprises a mobile communication device.

22 . The method of claim 17 , wherein the device comprises a base station.

23 . The method of claim 17 , further comprising, when the parameter has a second value:
selecting, at the device, the filter information; determining, at the device, a filter based on the filter information; and generating, at the device, the high-band excitation signal based on application of the filter to a first high-band excitation signal.

24 . The method of claim 23 , wherein the application of the filter to the first high-band excitation signal generates a filtered signal, wherein the high-band excitation signal is generated by combining the filtered signal with another signal that is based on a noise signal.

25 . A computer-readable storage device storing instructions that, when executed by a processor, cause the processor to perform operations comprising:
receiving a parameter associated with a bandwidth-extended audio stream; determining a value of the parameter; selecting, based on the value of the parameter, one of target gain information associated with the bandwidth-extended audio stream or filter information associated with the bandwidth-extended audio stream; and generating a high-band excitation signal based on the one of the target gain information or the filter information.

26 . The computer-readable storage device of claim 25 , wherein the operations further comprise, when the parameter has a second value:
selecting the filter information; determining a filter based on the filter information; and generating the high-band excitation signal based on application of the filter to a first high-band excitation signal.

27 . An apparatus comprising:
means for receiving a parameter associated with a bandwidth-extended audio stream; and means for generating a high-band excitation signal based on one of target gain information associated with the bandwidth-extended audio stream or filter information associated with the bandwidth-extended audio stream, the one of the target gain information or the filter information selected based on a value of the parameter.

28 . The apparatus of claim 27 , wherein the means for receiving and the means for generating are integrated into a media playback device or a media broadcast device.

29 . The apparatus of claim 27 , wherein the means for receiving and the means for generating are integrated into a base station.

30 . The apparatus of claim 27 , wherein the means for receiving and the means for generating are integrated into a mobile communication device.

Assignees

• Qualcomm Inc

Inventors

• Atti Venkatraman
• Chebiyyam Venkata Subrahmanyam Chandra Sekhar

Classifications

• G10L19/18 Primary

  Vocoders using multiple modes · CPC title

• G10L19/167

  Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes · CPC title

• G10L19/24

  Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding · CPC title

• G10L19/0204

  using subband decomposition · CPC title

• G10L19/083 Primary

  the excitation function being an excitation gain (G10L25/90 takes precedence) · CPC title