Author_Institution :
Kahn Commun. Inc., Westbury, NY, USA
Abstract :
The independent sideband system of AM stereo can, by use of special audio processing, significantly improve mono reception. The resulting transmitted signal, called a `POWER-side´ signal, allows listeners to `sideband tune´ with new types of mono receivers so as to reduce co and adjacent channel interference, improve the effective fidelity of the AM receiver, and make the receiver´s tuning significantly less critical. Furthermore, due to the inequality of low frequency sideband components, the system reduces selective fading, antenna null distortion and re-radiation problems when the POWER-side signal is received by both `sideband tuned´ mono receivers as well as digitally tuned stereo and mono receivers which center tune to the carrier frequency. Most importantly, this type of wave substantially reduces co-channel `beating´ effects that have, since the earliest days of broadcasting, plagued AM signal reception
Keywords :
Hi-Fi equipment; radio broadcasting; AM receiver; AM signal reception; AM stereo; POWER-side signal; adjacent channel interference; antenna null distortion; audio processing; carrier frequency; cochannel interference; independent sideband system; low frequency sideband components; mono receivers; mono reception; selective fading; transmitted signal; tuning; Amplitude modulation; Antenna accessories; Broadcasting; Envelope detectors; Fading; Frequency modulation; Interchannel interference; MONOS devices; Receiving antennas; Tuning;