Technique for using a subcarrier frequency of a radio station to

Details Technique for using a subcarrier frequency of a radio station to Technique for using a subcarrier frequency of a radio station to

1991-05-03

1992-09-08

Kuntz, Curtis

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

455 70, 358142, 340792, 34082544, H04B 700

Patent

active

051466120

ABSTRACT:
A message is transmitted on a subcarrier of a main carrier frequency of a radio station. The message is displayed simultaneously with the audible reproduction of the radio program. The message is capable of being displayed dynamically by having different portions thereof sequencing through the display device until the entire message is concluded and/or using a variety of possible display attributes, such as scrolling and flashing. One feature involves scanning the radio band for a station that carries the message. Scanning of a plurality of subcarriers at each station is also performed. One embodiment transmits the message during the "dead time" of other programming normally transmitted on the same subcarrier. The alphanumeric characters of the message are preferably converted prior to transmission into a signal with an average value of zero. The converted characters are decoded at the receiver.

REFERENCES:
patent: 3632863 (1972-01-01), Hirashima
patent: 3825892 (1974-07-01), Catchpole
patent: 3838444 (1974-09-01), Coughlin et al.
patent: 4281217 (1981-07-01), Dolby
patent: 4369443 (1983-01-01), Gialcanza et al.
patent: 4450589 (1984-05-01), Eilers et al.
patent: 4646081 (1987-02-01), Tsunoda
patent: 4940975 (1990-07-01), Ide et al.
patent: 4952927 (1990-08-01), DeLuca et al.

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