Noise reduction in a stereo receiver

Details Noise reduction in a stereo receiver Noise reduction in a stereo receiver

2006-09-19

2006-09-19

Chin, Vivian (Department: 2644)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

C381S002000, C381S010000, C381S011000

Reexamination Certificate

active

07110549

ABSTRACT:
A method to denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human auditory system. Therefore, a stereo signal noise reducer, comprising a first filter bank (1) to split the stereo difference signal (1−r) into a plurality of subbands, respective first multipliers (20, . . . , 2N) to weight each of the subbands of the stereo difference signal with a respective corresponding control signal (C0, . . . , CN), and a first adder (3) to sum all weighted subbands of the stereo difference signal (1−r) to build a frequency selective weighted stereo difference signal (diff), within which a number and width of the subbands obtained via the first filter bank (1) are choosen according to the properties of the human auditory system, further comprises a weighting factor determination unit which determines a respective control signal (C0, . . . , CN) frequency selective based on the masking effect of the human auditory system.

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