Telephonic communications – Special services – Anonymous party
Patent
1995-06-07
1997-12-02
Knepper, David D.
Telephonic communications
Special services
Anonymous party
395 222, 395 223, 395 236, 395 242, 379 20, G10L 912
Patent
active
056945175
ABSTRACT:
A signal discrimination circuit for discriminating between a voice signal and a voiceband data signal that is transmitted over a telephone network. The signal discrimination circuit includes an electric power judgement unit, a zero-crossing number judgement unit, a sub-band power calculation unit, a tone detection unit, and a discriminated result output unit. The electric power judgement unit determines whether an input signal is a voice signal or a voiceband data signal based on an interblock electric power ratio of the input signal. The zero-crossing number judgement unit determines whether the input signal is a voice signal or a voiceband data signal based on a zero-crossing number of the input signal. The sub-band power calculation unit analyzes the input signal with a spectrum analyzer to generate a spectrum analyzed result and calculates sub-band powers using the spectrum analyzed result, and the tone detection unit determines a presence and absence of a tone signal based on the sub-band powers calculated by the sub-band power calculation unit. Based on determined results of the electric power judgement unit, the zero-crossing number judgement unit, and the tone detection unit, the discriminated result output unit determines whether the input signal is a voice signal or a voiceband data signal and outputs a judged result.
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Naito Yushi
Sugino Yukimasa
Collins Alphonso A.
Knepper David D.
Mitsubishi Denki & Kabushiki Kaisha
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