System and method for switching between a first filter and a second filter for a received audio signal

• US 7,970,604 B2
• Filed: 03/03/2009
• Issued: 06/28/2011
• Est. Priority Date: 03/29/2000
• Status: Expired due to Fees

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Johnston, James David, Kuo, Shyh-Shiaw
• Primary Examiner(s): Lerner; Martin
• Application Number:
  US12/396,732
• Publication Number:
  US 20090180645A1
• Time in Patent Office: 847 Days
• Field of Search: 704/200.1, 704/203, 704/205, 704/206, 704/500, 704/501, 341/51
• US Class Current: 704/205
• CPC Class Codes: G10L 19/03 Spectral prediction for preventing pre-echo; Temporary noise shaping [TNS], e.g. in MPEG2 or MPEG4

Abstract

System, method and computer-readable medium are disclosed for using filters signal processing. The system includes a module that receives information regarding a first filter, a module that receives information regarding a second filter, and a module that receives date to indicate switching between the first filter and the second filter across the spectrum of the received audio signal, and a module that processes the received audio signal according to the received data and switching between the first filter and the second filter, wherein at least one of the first filter and the second filter represent a merger of two initial filters.

Claims

1. A device that processes a received audio signal, the receiver device comprising:

a processor;

a first module configured to control the processor to receive information regarding a first filter;

a second module configured to control the processor to receive information regarding a second filter;

a third module configured to control the processor to receive data to indicate switching between the first filter and the second filter across a spectrum of the received audio signal, to yield received data; and

a fourth module configured to control the processor to process the received audio signal according to the received data and switching between the first filter and the second filter,

wherein at least one of the first filter and the second filter are generated from a clustering of a first group of initial filters and a second group of initial filters based on associated temporal envelopes.

2. The device of claim 1, wherein the spectrum of the received audio signal is represented as a plurality of bands.

3. The device of claim 2, wherein the plurality of bands are scale factor bands.

4. The device of claim 2, wherein the received data includes one bit per band to indicate the switching.

5. The device of claim 1, wherein the received data is a mask of one bit per scaled factor band.

6. The device of claim 1, wherein the first filter and the second filter are adjacent filters.

7. A tangible computer-readable medium storing instructions for controlling a receiving device to a received audio signal, the instructions comprising:

receiving information regarding a first filter;

receiving information regarding a second filter;

receiving data to indicate switching between the first filter and the second filter across a spectrum of the received audio signal, to yield received data; and

processing the received audio signal according to the received data and switching between the first filter and the second filter,

wherein at least one of the first filter and the second filter are generated from a clustering of a first group of initial filters and a second group of initial filters based on associated temporal envelopes.

8. The tangible computer-readable medium of claim 7, wherein the spectrum of the received audio signal is represented as a plurality of bands.

9. The tangible computer-readable medium of claim 8, wherein the plurality of bands are scale factor bands.

10. The tangible computer-readable medium of claim 8, wherein the received data includes one bit per band to indicate the switching.

11. The tangible computer-readable medium of claim 7, wherein the received data is a mask of one bit per scale factor band.

12. A method of processing a received audio signal, the method comprising:

receiving information regarding a first filter;

receiving information regarding a second filter;

receiving data to indicate switching between the first filter and the second filter across a spectrum of the received audio signal, to yield received data; and

processing via a processor the received audio signal according to the received data and switching between the first filter and the second filter,

wherein at least one of the first filter and the second filter are generated from a clustering of a first group of initial filters and a second group of initial filters based on associated temporal envelopes.

13. The method of claim 12, wherein the spectrum of the received audio signal is represented as a plurality of bands.

14. The method of claim 13, wherein the plurality of bands are scale factor bands.

15. The method of claim 13, wherein the received data includes one bit per band to indicate the switching.

16. The method of claim 12, wherein the received data is a mask of one bit per scale factor band.