H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 11/06 (2006.01) H04Q 1/457 (2006.01) H04Q 1/46 (2006.01) H04Q 7/32 (2006.01)
Patent
CA 2171485
The present invention relates to an apparatus and method for sending and receiving digital signals in a voice communication system (10). The apparatus includes a first subscriber analog telephone (12), a transmitter (13), a receiver (19) including a tone generator (20), and a second subscriber analog telephone (23). The transmitter (13) includes a tone detector (14), a first antenna (16), and a second antenna (18). In the preferred embodiment, the first subscriber analog telephone (12) is connected to the transmitter (13), and the second subscriber analog telephone (23) is connected to the receiver (19). The transmitter (13) receives an analog signal (11) carrying speech and DTMF signals from the first subscriber telephone (12). The transmitting unit (13) converts the analog speechsignal into a digital speech signal. The tone detector (14) determines whether the digital speech signal contains any digit information, preferably dialed digits such as dual tone multifrequency (DTMF) tones, and encodes any detected digits into special tone packets. The transmitting unit (13) compresses the digital speech signal, replaces compressed speech packets with any special tone packets from the tone detector (14) if necessary, and transmits a digitally modulated and compressed output signal using the antenna (16) via an RF transmission channel. The digitally compressed signal is received by the receiver (19) using the second antenna (18). The tone generator (20) recovers any special tone packets in the received signal and generates a corresponding tone signal to be sent to the second telephone subscriber (23). The receiver (19) decompresses the digital speech signal and converts the signal to an analog speech signal (22) that is sent to the second subscriber telephone (23).
Hughes Electronics Corporation
Sim & Mcburney
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