Data Transmission
AssigneeUniversity of Surrey
InventorsAhmet Kondoz, Nilantha Nandima Katugampala, Kholdoon Taha Al-Naimi, Stephane Villette
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Abstract
A system for transmitting input data over a speech channel of a network comprising: a modulator arranged to produce a modulated waveform signal transforming the data for transmission over the network; a channel compensation filter arranged to filter the modulated waveform signal after it has been transmitted over the speech channel to compensate for the response of the speech channel; and a demodulator arranged to retrieve the data from the filtered waveform signal.
Claims30
A system for transmitting input data over a speech channel of a network, the system comprising:
- a modulator arranged to produce a modulated waveform signal transforming the data for transmission over the network, the signal being adapted such that, if the network includes a source compression system, the signal can be transmitted through the source compression system;
- a channel compensation filter arranged to filter the modulated waveform signal after it has been transmitted over the speech channel to compensate for the response of the speech channel;
- and
- a demodulator arranged to retrieve the data from the filtered waveform signal.
A system according to any foregoing claim wherein the modulator is further arranged to modify the modulated signal so that it will be passed by a voice activity detector.
A system according to any foregoing claim wherein modulator is arranged to generate the modulated waveform signal as a symbol having at least one feature that has a position, an amplitude, and a sign, wherein at least one of the position, the amplitude and the sign of the feature is determined by the data.
A system according to any foregoing claim wherein the demodulator is arranged to monitor the time lag in the received modulated signal and correct for it.
A system according to any foregoing claim further comprising a speech compression module arranged to produce the input data from a speech input, and a speech decompression module arranged to decode a speech output from the retrieved data.
A modem arranged to communicate over a voice channel of a network, the modem comprising:
- a modulator arranged to produce a modulated waveform signal transforming data for transmission over the network;
- a channel compensation filter arranged to receive and filter modulated waveform signals transmitted over the speech channel to compensate for the response of the speech channel;
- and
- a demodulator arranged to retrieve the data from the filtered waveform signal.
A method of transmitting input data over a speech channel of a network, the method comprising:
- producing a modulated waveform signal transforming the input data for transmission over the network;
- filtering the modulated waveform signal after it has been transmitted over the speech channel to compensate for the response of the speech channel;
- and
- retrieving the data from the filtered waveform signal.
A method of transmitting data over a speech channel substantially as hereinbefore described with reference to the accompanying drawings.
A method of receiving data over a speech channel substantially as hereinbefore described with reference to the accompanying drawings.
A method of communicating data over a speech channel substantially as hereinbefore described with reference to the accompanying drawings.
Apparatus for transmitting data over a speech channel substantially as hereinbefore described with reference to the accompanying drawings.
Apparatus for receiving data over a speech channel substantially as hereinbefore described with reference to the accompanying drawings.
A data communications system substantially as hereinbefore described with reference to the accompanying drawings.
Dependencies are inferred from the claim text.