Band extension reproducing apparatus

Details Band extension reproducing apparatus Band extension reproducing apparatus

2011-03-01

2011-03-01

Warren, David S. (Department: 2832)

Music

Instruments

Electrical musical tone generation

C084S622000, C084S648000, C084S654000, C084S659000

Reexamination Certificate

active

07897864

ABSTRACT:
Signals in two different bands (band components) are extracted from an input signal by an HPF and a BPF, and frequency-shift processing is performed by an MPY. Further, in order to adjust levels of an interface between the band components of shifted frequency to a high-frequency band side and the input signal, band components with which the input signal is adjacent to the high-frequency band extension components are extracted by an HPF. Then, a gain is controlled on the basis of the output values from the HPF and the HPF so as to reduce a difference between the components of shifted frequencies and the level of the input signal by the level correction coefficient calculating unit and the MPY. Then, the shifted components are added to the high-frequency band of the input signal by an ADDER.

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