Audio encoding device and audio encoding method
AssigneePanasonic Corporation
InventorKoji Yoshida
Life of this patent
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Abstract
There is provided an audio encoding device capable of effectively encoding a stereo audio even when a correlation between channels of the stereo audio is small. In the device, a monaural signal generation unit (110) generates a monaural signal by using a first channel signal and a second channel signal contained in the stereo signal. An encoding channel selection unit (120) selects one of the first channel signal and the second channel signal. An encoding unit including a monaural signal encoding unit (112), a first channel encoding unit (122), a second channel encoding unit (124), and a switching unit (126) encodes the generated monaural signal to obtain core-layer encoded data and encodes the selected channel signal to obtain extended layer encoded data corresponding to the core-layer encoded data.
Claims12
A speech coding apparatus for encoding a stereo signal comprising a first single channel signal and a second single channel signal, the apparatus comprising:
- a monaural signal generator, comprising a processor, that generates a monaural signal using the first single channel signal and the second single channel signal;
- a selector, comprising a calculator that calculates a first parameter corresponding to the first single channel signal and a second parameter corresponding to the second single channel signal,
- the selector compares the first calculated parameter and the second calculated parameter to determine whether a criterion for implementing enhancement layer coding at high efficiency or high sound quality, based upon the comparison of the first calculated parameter and the second calculated parameter, is met, selects the first single channel signal if the criterion is met, and selects the second single channel signal if the criterion is not met;
- a coder that encodes the generated monaural signal to obtain core layer encoded data, and encodes the selected single channel signal to obtain enhancement layer encoded data corresponding to the core layer encoded data;
- and
- an outputter that outputs encoded data so that the encoded data is transmitted to speech decoding apparatus,
- wherein:
- the enhancement layer encoded data do not contain encoded data of an unselected single channel signal;
- and
- the encoded data includes selection information that represents which of the single channel signals the selector selected, the core layer encoded data and the enhancement layer encoded data.
A speech coding method for encoding a stereo signal comprising a first single channel signal and a second single channel signal, the method comprising:
- generating a monaural signal using the first single channel signal and the second single channel signal;
- calculating a first parameter corresponding to the first single channel signal and a second parameter corresponding to the second single channel signal;
- comparing the first calculated parameter and the second calculated parameter to determine whether a criterion for implementing enhancement layer coding at high efficiency or high sound quality, based upon the comparison of the first calculated parameter and the second calculated parameter, is met;
- selecting the first single channel signal if the criterion is met;
- selecting the second single channel signal if the criterion is not met;
- encoding a generated monaural signal to obtain core layer encoded data and encoding a selected single channel signal to obtain enhancement layer encoded data corresponding to the core layer encoded data;
- and
- outputting encoded data so that the encoded data is transmitted to a speech decoding apparatus,
- wherein:
- the enhancement layer encoded data do not contain encoded data of an unselected single channel signal;
- and
- the encoded data includes selection information that represents which of the single channel signals was selected, the core layer encoded data and the enhancement layer encoded data.
Dependencies are inferred from the claim text.