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. |