Hands-free telephone with cascaded attenuators

Details Hands-free telephone with cascaded attenuators Hands-free telephone with cascaded attenuators

1977-08-25

1979-07-17

Cooper, William C.

179 1FS, H04M 160

Patent

active

041616243

ABSTRACT:
A hands-free telephone set has both transmit and receive channels open for the reception of signals, while still inhibiting feedback-singing. Two switched attenuators are provided in cascade in each channel. The first attenuator is switched after a syllable delay, and the second attenuator is switched after a yet longer delay.

REFERENCES:
patent: 2850569 (1958-09-01), Flury
patent: 3893038 (1975-07-01), Omata et al.
patent: 3925618 (1975-12-01), Kato
patent: 4052562 (1977-10-01), Andersen
G. W. Reichard et al., "The 4A Speakerphone--A Hands-Down Winner," Bell Lab. Record., Sep. 1973, pp. 233-237.

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