AUDIO CODING AND DECODING
First Claim
1. An audio encoding device (100), comprising first encoding means (101, 111) for encoding transient signal components and/or sinusoidal signal components of an audio signal and producing a residual signal, and second encoding means for encoding the residual signal, wherein the second encoding means comprise filter means (122, 125) for selecting at least one frequency band of the residual signal, and wherein the second encoding means further comprise at least a first encoding unit (123, 126) and a second encoding unit (124, 121) for encoding the selected frequency band and an additional frequency band of the residual signal respectively.
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Abstract
An audio encoding device (100) comprises first encoding means (101, 111) for encoding transient signal components and/or sinusoidal signal components of an audio signal (x(n)) and producing a residual signal (z(n)), and second encoding means for encoding the residual signal. The second encoding means comprise filter means (122) for selecting at least two frequency bands of the residual signal. The selected frequency bands (LF, HF) of the residual signal (z(n)) are encoded by a first encoding unit (123) and a second encoding unit (124) respectively. The first encoding unit (123) may comprise a waveform encoder, such as a time-domain encoder, while the second encoding unit (124) may comprise a noise encoder.
23 Citations
35 Claims
- 1. An audio encoding device (100), comprising first encoding means (101, 111) for encoding transient signal components and/or sinusoidal signal components of an audio signal and producing a residual signal, and second encoding means for encoding the residual signal, wherein the second encoding means comprise filter means (122, 125) for selecting at least one frequency band of the residual signal, and wherein the second encoding means further comprise at least a first encoding unit (123, 126) and a second encoding unit (124, 121) for encoding the selected frequency band and an additional frequency band of the residual signal respectively.
- 22. A method of encoding an audio signal, the method comprising the steps of encoding transient signal components and/or sinusoidal signal components of the audio signal and producing a residual signal, and encoding the residual signal, wherein the step of encoding the residual signal comprises the sub-steps of selecting a frequency band of the residual signal, and encoding the selected frequency band and an additional frequency band of the residual signal separately.
Specification