Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1981-10-16
1983-12-20
Rubinson, G. Z.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
328 25, 340384E, 179 90B, H03B 1900
Patent
active
044219520
ABSTRACT:
Circuitry for synthesizing a busy or reorder tone comprised of a first tone having a frequency of 770 Hz and a second tone having a frequency of 1150 Hz is described. The inventive synthesizing circuitry requires only one clock oscillator, whose output is coupled to a programmable divider. The programmable divider is switched between two divisor numbers at a frequency that is substantially one-half of a frequency selected from a predetermined range of frequencies substantially midway between 770 Hz and 1150 Hz. In the preferred embodiment, the programmable divider output is switched between frequencies of 1250 Hz and 883.3 Hz at a 500 Hz rate. The programmable divider output is then interrupted at a 2 Hz rate to provide the synthesized busy signal. The inventive synthesizing circuitry may be advantageously utilized in mobile or portable radios for providing a busy signal that sounds essentially identical to a fast busy or reorder tone comprised of two tones.
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FCC Form #401-"An Application for a Developmental Cellular Mobile and Portable Radio Telephone System in the Washington-Baltimore Northern Virginia Area"-Submitted by: American Radio Telephone Service, Inc.-1600 Crt. Sqr. Building-Baltimore MD, 21202, pp. 4-76 through 4-86, 1977.
"Portable Telephones for Cellular Systems" by Albert J. Leitich and Donald L. Linder MOTOROLA, INC. Chicago Corporate R & D Center 80CH1601-4 Copyright 1980 Vehicular Technology Society IEEE.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Roney Edward M.
Rubinson G. Z.
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