Patent ID: 8472508
Filing Date: 2013-06-25
Classification: G10L,H04K,H04L

Abstract:
1. A system for transmitting digital input data over a speech channel of a network, the system comprising: a modulator arranged to transform the digital input data to produce a modulated waveform signal resembling a speech signal, wherein the modulator is arranged, in transforming the digital input data, to convert the digital input data into a sequence of symbols, each of the symbols comprising a segment of the modulated waveform signal, and the modulator including a spectral shaping module that applies at least one of a periodic gain that varies with the frequency to frequency components of the modulated waveform signal, time domain filtering, a convolutional operation, and amplitude modification, to thereby modify the modulated waveform signal so that the modulated waveform signal varies over time so that the modified modulated waveform signal will be passed by a voice activity detector; a speech compression module arranged to convert the modulated waveform signal after the compressed signal has been transmitted over the speech channel to compensate for a response of the speech channel; and a demodulator arranged to retrieve the input digital data from the filtered modulated waveform signal.