Audio decoder with expanded band information

Details Audio decoder with expanded band information Audio decoder with expanded band information

2007-06-26

2007-06-26

Chin, Vivian (Department: 2615)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S022000, C381S023000, C381S098000, C381S061000, C704S500000, C704S501000, C704S502000

Reexamination Certificate

active

10227023

ABSTRACT:
An audio processing unit that provides a high-sound-quality reproduction even when a band property of an input encoded signal drops at or below a Nyquist frequency. The audio processing unit has a band-variable bandpass filter1500;a band determining section1700for determining a passband of the band-variable bandpass filter with respect to a band extension component from an extended band generating section1300by using decoding information from a decode-processing section1100as a band determination information; and a bandpass filter controller1600for controlling the passband of the band-variable bandpass filter in accordance with an indication from the band determining section.

REFERENCES:
patent: 6449519 (2002-09-01), Kuwaoka
patent: 6725110 (2004-04-01), Suzuki

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