Dual-transform coding of audio signals
An audio signal and encoding technology, applied in the field of audio signal encoding and decoding
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[0033] Various embodiments of the present invention extend and improve the performance of audio signal processing with innovative encoders and decoders. Broadly speaking, encoding processing includes transform processing, quantization processing, and encoding processing. Various embodiments of the invention make improvements in all three processes.
[0034] In most prior art audio signal processing, audio signal frames have a fixed length. The shorter the frame length, the lower the latency. For high frequencies, shorter frame lengths also provide better temporal resolution and better performance. However, short frames provide poor frequency resolution. Conversely, the longer the frame length, the longer the delay. However, at low frequencies, longer frames provide better frequency resolution and better performance at distinguishing tonal harmonics. In a compromise solution, the frame length is generally in the range of 20 ms, which is also the frame length adopted in the...
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