Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-06-20
1977-10-11
Caldwell, John W.
Communications: electrical
Audible indication
Percussion-type sound producer
2351503, 246 28R, 328 61, 332 10, 340 47, 340348, 364701, G08C 1928
Patent
active
040538796
ABSTRACT:
A digital code rate generator comprises a digital number generator driven by a clock running at an appropriate frequency. Preferably the digital number generator is arranged to simultaneously generate digital representations for a plurality of different numbers. These different digital representations are provided to a selector which passes one of said digital representations to an accumulator. The accumulator continually sums the digital representations provided to it by the selector. An output of the accumulator is connected to an overflow detector which is distinctively operated when the sum of the digital representations provided to the accumulator exceeds the capacity of the accumulator. By selecting the frequency of the clock and the particular digital representation which passes the selector, the rate of operation of the overflow detector can be controlled. The output of the overflow detector thus comprises any one of a number of selectable digitally generated code rates.
In another embodiment of the invention the output of the overflow detector is connected to an NAND gate whose other input is provided by the output of a divider, whose input is connected to the clock. The divider is so arranged that its output constitutes the signal carrier in a signaling system. The output of the NAND gate thus comprises a coded carrier which is turned on and off at the code rate generated by the digital code rate generator.
REFERENCES:
patent: 3088099 (1963-04-01), DuVall
patent: 3525039 (1970-08-01), Mindheim
patent: 3555201 (1971-01-01), Kuehnle
patent: 3590226 (1971-06-01), Lane
patent: 3609729 (1971-09-01), Anderson
patent: 3657658 (1972-04-01), Kubo
patent: 3670248 (1972-06-01), Hofmann
patent: 3885228 (1975-05-01), Katz et al.
Caldwell John W.
General Signal Corporation
Groody James J.
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