Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1990-10-18
1993-03-30
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379388, 379395, H04M 160
Patent
active
051990652
ABSTRACT:
A method for automatic speech direction reversal includes supplying a reception signal with variable damping to a loudspeaker, outputting a microphone signal with variable damping from a microphone as a transmission signal; continuously classifying each of the reception signal and the microphone signal as a speech signal or noise; setting the damping of one of the signals classified as the speech signal to a first damping value, setting the damping of the other of the signals to a second damping value being higher than the first damping value, and maintaining the set damping until the one signal is classified as noise. The preceding damping values are maintained if both of the signals are classified as a speech signal. Both damping vlaues are set to a third damping value being located between the first and second damping values if both of the signals are classified as noise. A transition is performed from one of the first and second damping values to the third damping value more slowly than a transition from the third damping value to one of the first and second damping values, more slowly than a transition from the first to the second damping value, and more slowly than a transition from the second to the first damping value. A configuration for performing the method includes a loudspeaker, a controllable reception attenuator, a microphone, a controllable transmission attenuator, two signal
oise detectors, and a control logic.
REFERENCES:
patent: 4052562 (1977-10-01), Andersen
patent: 4087636 (1978-05-01), Akiyama et al.
patent: 4581758 (1986-03-01), Coker et al.
patent: 5048082 (1991-10-01), Krafft
German Publication: Elektronik, 22, Oct. 30, 1987, p. 87ff; Chandra Desai, "Frei sprechen ohne Ruckkopplung".
Redl Siegmund
von Zitzewitz Andreas
Dwyer James L.
Greenberg Laurence A.
Lerner Herbert L.
Shehata M.
Siemens Aktiengesellschaft
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