Telegraphy – Systems – Printing
Patent
1979-06-15
1981-03-10
Robinson, Thomas A.
Telegraphy
Systems
Printing
178 69A, 324 79D, H04M 308
Patent
active
042556236
ABSTRACT:
An incoming pulse train is evaluated for interpulse spacing and pulse repetition rate by first shaping the pulses into a desired configuration in a dial pulse shaper (12). The shaped pulses are applied to a pulse counter and controller (14) to generate numerator and denominator signals of a divide function. The numerator and denominator signals are gated through a data selector (16) to an up counter controller (24). The up counter controller (24) gates a 2 KHz clock to a counter in a divider and display (18) during the denominator signal and during the numerator signal the counter within the divider display (18) is gated to perform the divide functions. The divider and display (18) carries out a division function of the numerator by the denominator with the quotient representing the percent interpulse interval or the pulse repetition rate depending on the mode of operation. In addition, the frequency of a tone pad is measured by actuating a DTMF controller (20) that drives the touch tone pad through the dial pulse shaper (12) which also generates a frequency signal having a configuration for further processing. This frequency signal is gated through the up counter controller (24) to the divider and display (18) which in this mode functions as a frequency counter. Frequency signals and various timing functions are provided by an oscillator and divider (28) and a counter reset (26) initiates the system and resets various system components in the measurement modes.
REFERENCES:
patent: 3582554 (1971-06-01), LeBlang
patent: 3603746 (1971-09-01), Heick et al.
patent: 3997740 (1976-12-01), Eubank et al.
Barnes Larry A.
Daugherty Daniel
Flynn Michael D.
Robertson Michael D.
Welch Kenneth R.
Robinson Thomas A.
San Angelo Communications & Electronics, Inc.
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