Spectral audio encoding

Details Spectral audio encoding Spectral audio encoding

2006-02-28

2006-02-28

Tran, Khai (Department: 2637)

Pulse or digital communications

Spread spectrum

Frequency hopping

C375S135000, C375S136000, C380S042000, C380S253000, C725S018000

Reexamination Certificate

active

07006555

ABSTRACT:
Blocks of audio are encoded based upon corresponding first and second frequencies. The first and second frequencies are hopped from block to block. An audio quality measure (AQM) is computed for each block of audio such that, if x out of y blocks of audio have an AQM greater than a first predetermined threshold, encoding is suspended. For example, x may be nine and y may be 16. Also, if a ratio of the energy in a front part of a block of audio to the energy in a rear part of the block of audio is greater than a second predetermined threshold, that block of audio is not encoded even though x out of y blocks of audio have an AQM greater than the first predetermined threshold. Multiple distributors of the audio may encode the audio with their corresponding identities using the above processes.

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