Methods and apparatus for encoding, decoding, encrypting and dec

Details Methods and apparatus for encoding, decoding, encrypting and dec Methods and apparatus for encoding, decoding, encrypting and dec

1997-10-27

2000-06-27

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

With content reduction encoding

704504, 704205, G10L 2104

Patent

active

060817844

ABSTRACT:
An information encoding method for encrypting and encoding information signals, such as PCM audio signals, in which the information signals can be reproduced with low quality even in the absence of the key information for encryption. For carrying out the information encoding method, the input PCM signals are converted by a transform unit into frequency signal components which are encoded by a signal component encoding unit. High frequency range side signal components are sent to an Ex-OR gate to take an Ex-OR of the high frequency range side signal components with a pseudo random bitstring from a pseudo random bitstring generating unit. A codestring generating unit 1606 generates a codestring having the low frequency range side components from a signal component encoding unit and the encrypted high frequency range side components from the Ex-OR gate.

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Application No. 08/837,706, filed Apr. 22, 1997.

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