Method and apparatus for encoding/decoding of background sounds
AssigneeTelefonaktiebolaget LM Ericsson
InventorRolf A. Bergstrom
Life of this patent
Estimating the term…
Abstract
A method and apparatus for encoding/decoding of background sounds. The background sounds are encoded/decoded in a digital frame based speech encoder/decoder. First, it is determined whether the signal that is directed to the encoder/decoder represents primarily speech or background sounds. When the signal directed to the encoder/decoder represents primarily background sounds, the temporal variation between consecutive frames and/or the domain of at least one filter defining parameter is restricted.
Claims10
A method of encoding and/or decoding background sounds in a digital frame based speech encoder and/or decoder including a signal source connected to a filter, said filter being defined by a set of parameters for each frame, for reproducing the signal that is to be encoded and/or decoded, said method comprising the steps of:
- determining estimated filter parameters;
- detecting whether the signal that is directed to said encoder/decoder represents primarily speech or background sounds;
- and
- modifying when said signal directed to said encoder/decoder represents primarily background sounds, at least one estimated filter parameter by restricting the temporal variation between consecutive frames and/or the domain of said at least one estimated filter parameter.
An apparatus for encoding and/or decoding background sounds in a digital frame based speech encoder and/or decoder including a signal source connected to a filter, said filter being defined by a set of parameters for each frame, for reproducing the signal that is to be encoded and/or decoded, said apparatus comprising:
- means for determining estimated filter parameters;
- means for detecting whether the signal that is directed to said encoder/decoder represents primarily speech or background sounds;
- and
- means for modifying at least one estimated filter parameter by restricting the temporal variation between consecutive frames and/or the domain of said at least one estimated filter parameter when said signal directed to said encoder/decoder represents primarily background sounds.
Dependencies are inferred from the claim text.