Method of detecting a predetermined frequency band in an audio data signal, detection device and computer program corresponding thereto

• US 9,928,852 B2
• Filed: 12/10/2015
• Issued: 03/27/2018
• Est. Priority Date: 12/20/2011
• Status: Active Grant

• Current Assignee: Orange S.A.
• Original Assignee: Orange S.A.
• Inventors: Nagle, Arnault, Lamblin, Claude
• Primary Examiner(s): VO, HUYEN X
• Application Number:
  US14/965,528
• Publication Number:
  US 20160171986A1
• Time in Patent Office: 838 Days
• Field of Search: 704500-504, 704219-230
• CPC Class Codes: G10L 19/02 using spectral analysis, e.g. transform vocoders or subband vocoders
• CPC Class Codes: G10L 19/06 Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
• CPC Class Codes: G10L 19/08 Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
• CPC Class Codes: G10L 19/26 Pre-filtering or post-filtering
• CPC Class Codes: G10L 25/78 Detection of presence or absence of voice signals switching of direction of transmission by voice frequency in two-way loud-speaking telephone systems H04M9/10

Abstract

A method is provided for detecting a predetermined frequency band in an audio data signal which has previously been coded according to a succession of data blocks, among which at least certain blocks contain respectively at least one set of spectral parameters representing a linear prediction filter. Such a method of detection implements, for a current block among the at least certain blocks and for which at least a plurality of spectral parameters of the set have been previously decoded, acts of: determining, among the plurality of previously decoded spectral parameters, the index of the first spectral parameter closest to a threshold frequency; calculating at least one criterion on the basis of the determined index; and deciding whether the predetermined frequency band is detected in the current block, as a function of the criterion calculated.

Claims

1. A method comprising the following acts performed by a terminal having a processor that is configured by instructions stored in a non-transitory computer-readable medium, wherein the method comprises:

receiving, by the terminal, an audio data signal which has been previously coded according to a succession of data blocks, among which at least certain blocks contain respectively at least one set of spectral parameters representing a linear prediction filter;

decoding at least one of said certain blocks that contains at least one set of spectral parameters representing a linear prediction filter, at least one plurality of spectral parameters of said set being decoded as a result of said decoding; and

implementing, for at least one decoded current block, the following acts;

calculating, as a function of an index of the decoded spectral parameter closest to a threshold frequency, a value of a decision criterion representing detection of whether a predetermined frequency band is present in said audio data signal received, and

displaying an HD logo on a display screen of the terminal as a function of the calculated value of the decision criterion to indicate a quality of the audio data signal received and whether the predetermined frequency band is present in said received audio data signal.

2. The method of claim 1, wherein displaying comprises the terminal modifying a contrast of the displayed HD logo as a function the calculated value of said decision criterion, a higher or lower contrast of the HD logo corresponding to a higher or lower calculated value of said decision criterion.

3. A terminal comprising:

a display screen;

a processor; and

a non-transitory computer-readable medium comprising instructions stored thereon, which when executed by the processor configure the terminal to perform acts comprising;

receiving an audio data signal which has been previously coded according to a succession of data blocks, among which at least certain blocks contain respectively at least one set of spectral parameters representing a linear prediction filter;

decoding at least one of said certain blocks that contains at least one set of spectral parameters representing a linear prediction filter, at least one plurality of spectral parameters of said set being decoded as a result of said decoding; and

for at least one decoded current block;

calculating, as a function of an index of the decoded spectral parameter closest to a threshold frequency, a value of a decision criterion representing whether a predetermined frequency band is present in said audio data signal received, and

displaying an HD logo on a display screen of the terminal as a function of the calculated value of the decision criterion to indicate a quality of the audio data signal received and whether the predetermined frequency band is present in said received audio data signal.

4. The terminal of claim 3, wherein displaying comprises the terminal modifying a contrast of the displayed HD logo as a function the calculated value of said decision criterion, a higher or lower contrast of the HD logo corresponding to a higher or lower calculated value of said decision criterion.