Method and apparatus for detecting voice activity in a speech signal
AssigneeConexant Systems, Inc.
InventorsAdil Benyassine, Eyal Shlomot
Life of this patent
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Abstract
A method and apparatus for generating frame voicing decisions for an incoming speech signal having periods of active voice and non-active voice for a speech encoder in a speech communications system. A predetermined set of parameters is extracted from the incoming speech signal, including a pitch gain and a pitch lag. A frame voicing decision is made for each frame of the incoming speech signal according to values calculated from the extracted parameters. The predetermined set of parameters further includes a frame full band energy, and a set of spectral parameters called Line Spectral Frequencies (LSF).
Claims13
In a speech communication system, a method for generating a frame voicing decision, the steps of the method comprising:
- extracting a set of parameters, including pitch gain and pitch lag, from an incoming speech signal, for each frame;
- calculating a standard deviation of the pitch lag from the extracted parameters over a consecutive number of subframes;
- calculating a long term average of the pitch gain from the extracted parameters;
- and
- making a frame voicing decision according to the results of said calculation step.
A Voice Activity Detector (VAD) for making a voicing decision on an incoming speech signal frame, the VAD comprising:
- an extractor for extracting a set of parameters, including pitch gain and pitch lag, from the incoming speech signal for each frame;
- a calculator unit for calculating a standard deviation of the pitch lag from the extracted parameters over a consecutive number of subframes and a long term mean pitch gain from the extracted parameters;
- and
- a decision unit for making a frame voicing decision according to the results from the calculator unit.
Dependencies are inferred from the claim text.