2 results about "Code-excited linear prediction" patented technology

An audio coding device for coding an audio signal comprises an audio encoder configured to code the audio signal; and a side information encoder configured to calculate a parameter for a look-ahead signal in code excited linear prediction (CELP) coding as side information, the side information for use in packet loss 10 concealment in the CELP coding. The audio encoder is configured to calculate an index representing characteristics of a frame being coded and transmit the index to the side information encoder. The side information encoder is further configured to include, in response to the frame being coded being a specific frame class, a pitch lag of a next frame coded after the frame being coded, the 15 pitch lag of the next frame included as the side information in the frame being coded. The side information encoder is further configured, in response to the frame being coded not being the specific frame class, to not include the pitch lag of the next frame in the frame being coded, wherein the specific frame class is a type of frame that is affected by a packet loss. 20 24 26 70 59 29 N ov 2 02 4 2 0 2 4 2 6 7 0 5 9 2 9 N o v 2 0 2 4 5 A B S T R A C T

This encoding device comprises: a control unit that, if an inputted stereo signal is determined to be a signal suitable for encoding using a mid-side stereo system, determines whether to apply a first encoding mode or a second encoding mode on the basis of a numerical value calculated by using the number of bits estimated to be necessary for encoding a mid-channel and the number of bits estimated to be necessary for encoding a side channel; a first encoding unit that, if application of the first encoding mode is determined, applies code-excited-linear-prediction (CELP) encoding to a mid-channel signal; and a second encoding unit that, if application of the second encoding mode is determined, performs spectral encoding on a stereo signal.