Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-01-31
1999-12-21
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455561, 704200, H04Q 730
Patent
active
060061081
ABSTRACT:
A novel and improved digital FM audio processor for use in a dual-mode communication system selectively operative in either FM or code division multiple access (CDMA) modes. Analog voice or voice-band data is input to a speech encoder/decoder (CODEC) which converts the analog signal to a digital signal. The digital FM signal is read from the CODEC, filtered, compressed, up-sampled and combined with a transponded SAT signal and then modulated for RF transmission. On the receive side, the FM analog signal is received, demodulated, down-sampled, expanded, and filtered before being converted to the proper format (.mu.-law, a-law, or linear) for the speech CODEC. The CODEC then converts the digital FM audio signal into an analog waveform for conversion to sound. By performing the FM audio processing digitally, the same digital signal processing (DSP) firmware may integrated on the same application specific integrated circuit (ASIC) which is capable of performing audio processing of both FM and CDMA audio signals.
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Black Peter J.
Chang Henry
Lee Way-Shing
Singh Randeep
Edmonston Brian S.
Martin Roger W.
Miller Russell B.
Qualcomm Incorporated
Urban Edward F.
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