H - Electricity – 04 – H
Patent
H - Electricity
04
H
325/37
H04H 5/00 (2006.01)
Patent
CA 1189908
MULTIPLE TONE PILOT SIGNAL SYSTEM ABSTRACT OF THE DISCLOSURE multiple low frequency tones are employed for stereo indication in an AM stereo radio system. The tones are modulated on a carrier wave which is also multiplex modulated by stereo related audio signals. Detection of the presence of one of the tones in a received signal provides an indication of the possibility of stereo related modulation components in the received signal. Detection of the presence of both tones in the received signal provides confirmation that stereo related modulation components are in the received signal. In a preferred embodiment, 15 Hz and 30 Hz phase-related tones are used. A stereo receiver incorporates 15 Hz and 30 Hz phase detectors which form interrelated phase-locked loops with a 30 Hz reference oscillator. The presence of both tones in the proper phase relationship indicates reception from an AM radio station which is broadcasting in stereo. -1-
400572
Hazeltine Corporation
Johnson Douglas S. Q.c.
LandOfFree
Multiple tone pilot signal system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple tone pilot signal system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple tone pilot signal system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1180393