Patent ID: 8290784
Filing Date: 2012-10-16
Classification: G10L

Abstract:
1. A signal processing apparatus operable to adjust a level of an audio signal in a code string obtained by converting a time signal to a frequency component, demultiplexing the frequency component into a plurality of demultiplexed signal components, normalizing independently each of the plurality of demultiplexed signal components, and quantizing, coding and multiplexing the normalized demultiplexed signal components, the signal processing apparatus comprising: demultiplexing means for demultiplexing the code string; increasing/decreasing means for adding or subtracting a first integer value to/from a normalization coefficient of each of the plurality of the demultiplexed signal components; additional signal component generating means for copying the demultiplexed signal component of a subset of the plurality of the demultiplexed signal components, adding or subtracting a second integer value to/from the normalization coefficient of each of the demultiplexed signal component of the subset, and generating an additional signal component; and multiplexing means for multiplexing the plurality of demultiplexed signal components and the additional signal component.