Telecommunications – Wireless distribution system
Patent
1988-12-06
1991-08-06
Eisenzopf, Reinhard J.
Telecommunications
Wireless distribution system
455 6, 455 72, 358 86, 381 2, 381 3, 375 17, H04H 102, H04H 500, H04N 100
Patent
active
050384023
ABSTRACT:
Method and apparatus are provided for transmitting, receiving, and reproducing digital audio signals as discrete carriers similar to standard FM broadcast signals. An audio signal is digitized using, for example, adaptive delta modulation techniques. Several channels of audio information, such as left and right stereo channels and a second audio program ("SAP") channel can all be digitized and incorporated onto the digital broadcast signal carrier. The digitized audio signal may be modulated using multiphase modulation of the carrier of an FM broadcast band signal. A plurality of audio channels may be digitized and transmitted over the airwaves, or over a cable transmission network. Channels of nondigitized audio channels may be interspersed with the digitized audio channels. Source material for the digitized audio channels may be provided to a cable headend over the cable transmission network outside the FM band, and rebroadcast over the cable transmission network in the FM band. Advantageously, an "extended" FM band between 72-120 MHz is employed to provide more channels than the "standard" FM band of 88-108 MHz.
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Eisenzopf Reinhard J.
Faile Andrew
General Instrument Corporation
Litsitz Barry R.
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