MDCP: Patent Abstact US05825320: Gain control method for audio encoding device

US05825320 Gain control method for audio encoding device

Assignee Sony Corporation

Assign./Filed Oct. 20, 1998/ March 13, 1997

Inventors Miyamori; Shinji, Ueno; Masatoshi

Summary Gain control method for handling pre-echo used by ATRAC2/3.

Abstract A method and apparatus for encoding input signals, such as digital data, by so-called high-efficiency encoding, in which pre-echo and post-echo are suppressed. A gain control position decision circuit detects an attack portion and a release portion of an audio signal entering an input terminal. An acoustic model application circuit finds a masking level based on a psychoacoustic model of the input signal. A gain control decision circuit determines the gain control value adaptively selected in accordance with the masking level. A gain control circuit controls the gain of the audio signal entering the input terminal in meeting with the gain control value.

US05825320	Gain control method for audio encoding device
Assignee	Sony Corporation
Assign./Filed	Oct. 20, 1998/ March 13, 1997
Inventors	Miyamori; Shinji, Ueno; Masatoshi
Summary	Gain control method for handling pre-echo used by ATRAC2/3.
Abstract	A method and apparatus for encoding input signals, such as digital data, by so-called high-efficiency encoding, in which pre-echo and post-echo are suppressed. A gain control position decision circuit detects an attack portion and a release portion of an audio signal entering an input terminal. An acoustic model application circuit finds a masking level based on a psychoacoustic model of the input signal. A gain control decision circuit determines the gain control value adaptively selected in accordance with the masking level. A gain control circuit controls the gain of the audio signal entering the input terminal in meeting with the gain control value.