Methods and arrangements in a telecommunications network
OwnerVolodya Grancharovinventor
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Abstract
The present invention relates to a postfilter and a postfilter control to be associated with a postfilter for improving perceived quality of speech reconstructed at a speech decoder. The postfilter control comprises means for measuring stationarity of a speech signal reconstructed at a decoder, means for determining a coefficient to a postfilter control parameter based on the measured stationarity, and means for transmitting the determined coefficient to a postfilter, such that the postfilter can process the reconstructed speech signal by applying the determined coefficient to the postfilter control parameter to obtain an enhanced speech signal.
Claims20
A method for improving perceived quality of speech reconstructed at a speech decoder, comprises the steps of:
- measuring stationarity of a speech signal, defined as the Euclidean distance between spectral densities of two neighboring speech segments, reconstructed at a decoder,
- determining a coefficient to a post-filter control parameter based on the measured stationarity, and
- transmitting the determined coefficient to the post-filter, such that the post-filter can process the reconstructed speech signal by applying the determined coefficient to the post-filter control parameter to obtain an enhanced speech signal.
A method in a post-filter for improving perceived quality of speech reconstructed at a speech decoder, the method comprises the steps of:
- receiving a determined coefficient to the post-filter, and
- processing the reconstructed speech signal by applying the determined coefficient to the post-filter control parameter to obtain an enhanced speech signal, wherein the coefficient is determined based on a measured stationarity of the speech signal, defined as the Euclidean distance between spectral densities of two neighboring speech segments, reconstructed at a decoder.
A post-filter control to be associated with a post-filter for improving perceived quality of speech reconstructed at a speech decoder, the post-filter control comprising:
- means for measuring stationarity of a speech signal, defined as the Euclidean distance between spectral densities of two neighboring speech segments, reconstructed at a decoder;
- means for determining a coefficient to a post-filter control parameter based on the measured stationarity;
- and
- means for transmitting the determined coefficient to a post-filter, such that the post-filter can process the reconstructed speech signal by applying the determined coefficient to the post-filter control parameter to obtain an enhanced speech signal.
A post-filter for improving perceived quality of speech reconstructed at a speech decoder, comprising:
- means for receiving a determined coefficient to the post-filter;
- and
- a processor for processing the reconstructed speech signal by applying the determined coefficient to the post-filter control parameter to obtain an enhanced speech signal, wherein the coefficient is determined based on a measured stationarity of the speech signal, defined as the Euclidean distance between spectral densities of two neighboring speech segments, reconstructed at a decoder.
The post-filter, according to, wherein the determined coefficient is a linear combination of a first parameter being a measure of the spectral distance between the current and the previous frame and a second parameter being a measure of how far said spectral distance is to a low-passed spectral distance, θsmooth, of the past frames.
Dependencies are inferred from the claim text.