Telephone signal processing
AssigneeSemafone Limited
InventorsYufei Tao, Thomas Baldwin
Life of this patent
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Abstract
A method of processing a telephone signal comprising voice signals and data signals, the method comprising detecting the presence of an artefact in the telephone signal indicative of the presence of a data signal fragment associated with an earlier attenuation of a data signal and processing the telephone signal by further attenuating the telephone signal in the region of the artefact in order to remove the data signal fragment from the telephone signal.
Claims56
A method of processing a telephone signal comprising voice signals and data signals, the method comprising:
- detecting the presence of an artefact in the telephone signal indicative of the presence of a data signal fragment associated with an earlier attenuation of a data signal;
- and
- processing the telephone signal by further attenuating the telephone signal in the region of the artefact in order to remove the data signal fragment from the telephone signal.
A method according to any preceding claim, further comprising further attenuating the telephone signal only when data signal fragments are expected to be present.
A method according to any preceding claim, wherein processing of the telephone signal occurs in the time domain.
A method according to any preceding claim, wherein the artefact comprises a spike in the telephone signal, defined by the ratio of the maximum or peak amplitude of the telephone signal to the noise floor exceeding a threshold.
A method according to any preceding claim, wherein the data signals comprise sensitive information and/or transaction information.
A method according to any preceding claim, the method further comprising:
- receiving the voice signals and data signals at a first telephone interface and in a first mode, transmitting the voice signals and the data signals via a second telephone interface;
- and
- in a second mode, attenuating the data signals and optionally transmitting the voice signals via the second telephone interface.
A telephone call processor for processing telephone calls comprising voice signals and data signals, the call processor being adapted to:
- receive voice signals and data signals at a first telephone interface;
- detect the presence of an artefact in the telephone signal indicative of the presence of a data signal fragment associated with an earlier attenuation of a data signal;
- process the telephone signal by further attenuating the telephone signal in the region of the artefact in order to remove the data signal fragment from the telephone signal;
- and
- transmit the processed voice signals and data signals via a second telephone interface.
Dependencies are inferred from the claim text.