Radio communication device and cordless answer phone

Details Radio communication device and cordless answer phone Radio communication device and cordless answer phone

1992-09-10

1994-07-05

Kuntz, Curtis

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 61, H04M 1100, G10L 302

Patent

active

053274814

ABSTRACT:
A radio communication device and a cordless answer phone including base and hand sets connected with each other by radio and having a message recording and reproducing device is capable of improving sound quality of messages recorded and reproduced. A pair of switches are connected between a radio transmission and receiving device and a compandor having a compressor and an expander for the radio communication between the base and hand sets, and the sound quality improvement function of the compandor is used in recording and reproducing an answer message and a telephone message. When the message is recorded in the message recording and reproducing device, the amplitude of the sound signals is compressed, and after the compressed message is reproduced from the message recording and reproducing device, the amplitude of the sound signals of the message is expanded to enable the improvement of the sound quality.

REFERENCES:
patent: 4905003 (1990-02-01), Helferich
patent: 5081668 (1992-01-01), Ito
patent: 5220594 (1993-06-01), Ohnishi et al.
Rappaport and Vranesic, "A Multiprocessor Based Digital Speech Compressor", Canadian Elec. Eng. Journal, 1981.

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