Decoding apparatus, decoding method, encoding apparatus, encoding method, and editing apparatus

摘要

A decoding apparatus (10) is disclosed which includes: a storing means (11) for storing encoded audio signals including multi-channel audio signals; a transforming means (40) for transforming the encoded audio signals to generate transform block-based audio signals in a time domain; a window processing means (41) for multiplying the transform block-based audio signals by a product of a mixture ratio of the audio signals and a first window function, the product being a second window function; a synthesizing means (43) for overlapping the multiplied transform block-based audio signals to synthesize audio signals of respective channels; and a mixing means (14) for mixing audio signals of the respective channels between the channels to generate a downmixed audio signal. Furthermore, an encoding apparatus is also disclosed which downmixes the multi-channel audio signals, encodes the downmixed audio signals, and generates the encoded, downmixed audio signals.

主权项

1. A decoding apparatus comprising:
a channel decoder comprising:
a storing means for storing encoded audio signals including multi-channel audio signals;a transforming means for transforming the encoded audio signals to generate transform block-based audio signals in a time domain;a window processing means for multiplying the transform block-based audio signals by a second window function, wherein the second window function is a product of a mixture ratio of the audio signals and a first window function; anda synthesizing means for overlapping the multiplied transform block-based audio signals to synthesize multi-channel audio signals; and a mixing means for mixing the synthesized multi-channel audio signals between channels to generate a downmixed audio signal without multiplying the synthesized multi-channel audio signals using a mixture ratio, wherein the mixing occurs after multiplying the transform block-based audio signals by the second window function.