System and method for the transmission of an audio or speech...

Pulse or digital communications – Transmitters

Reexamination Certificate

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Reexamination Certificate

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07453951

ABSTRACT:
A system and method for transmitting an analog signal. The analog signal is converted into complex numbers such that two successive audio samples respectively form a real part and an imaginary part of a respective complex number. The complex numbers are then dispersed in a time-frequency space. The complex numbers are then modulated through a digital modulator into temporal signals and the temporal signals are output for transmission. Thereby, a digital modulator conventionally used for modulating digital input signals can operate for the transmission of an analog signal.

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Roch Lefebvre, et al., “Spectral Amplitude Warping (SAW) for Noise Spectrum Shaping in Audio Coding” University of Sherbrooke, Quebec, Canada, J1K 2R1, Copyright 1997 IEEE, pp. 335-338.

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