METHOD AND DEVICE FOR EXTRACTING SIGNAL AND MEDIUM RECORDING SIGNAL EXTRACTION PROGRAM

Japanese Patent JP3847989

B2

PROBLEM TO BE SOLVED: To extract in real-time only a voice signal component from a signal of one channel that a voice signal and a non-voice signal are mixed by using the signal shifting an input signal by a fixed time and using the high band emphasized signal.
SOLUTION: A delayed signal xj is supplied to an adaptive filter 1, and its filter coefficient Wj is successively updated by an output from an adaptive filter coefficient successive renewal part 2. The output signal zj of the adaptive filter 1 is applied to a reduction terminal of a subtracter 3, and is subtracted from the signal yj as it is applied to the non-reduction terminal of the subtracter 3, and the output of the subtracter 3 becomes an output signal ej of an adaptive processing circuit. The output signal ej of the adaptive processing circuit and respective tap output signals xj of the adaptive filter 1 are supplied to the adaptive filter coefficient successive renewal part 2, and the filter coefficient is updated successively based on algorithm by a learning identifying method to be outputted. The successive renewal of the filter coefficient is performed so that a difference ej between the output signal zj and a reference signal yj becomes small.

WO/2023/007173	METHOD AND SYSTEM FOR TIME AND FEATURE MODIFICATION OF SIGNALS
JP2001273000	ADAPTIVE NOISE SUPPRESSING SPEECH ENCODER
JP6966404	Output device and output method

Ryu Ikezawa
Akira Nakamura
Tetsuo Umeda

JP34806498A

November 22, 2006

December 08, 1998

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Japan Broadcasting Corporation

G10L25/78; G10L19/00; G10L21/0208; G10L21/0264; G10L21/0272; G10L21/0308; G10L25/81; H03H21/00; (IPC1-7): G10L19/00; G10L11/02; G10L21/02; H03H21/00

JP7007786A

Kosaku Sugimura
Hiroshi Tokunaga
Umemoto Masao
Juno Aoki
Shiro Fujitani

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