Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1981-10-19
1983-10-25
Bookbinder, Marc E.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
340722, 375 36, 455115, H04B 346, H04B 1700
Patent
active
044123493
ABSTRACT:
A method and apparatus is disclosed for the remote display of percentage modulation data obtained at a transmitter site. A modulation monitor at the transmitter site produces a positive excursion of the audio wave modulation of a carrier wave proportional to percentage modulation of a carrier wave. A special rectifier circuit having the "semi-peak" response characteristics specified by the FCC for the indicating meter of the modulation monitor is used to measure the excursions of the audio wave. The DC output of the rectifier circuit is sampled periodically and converted to parallel digital data by a standard analog to digital converter. This data is converted into a serial data stream by a parallel to serial converter for transmission through a conductor to the remote site. The serial data received at the remote site is reconverted to parallel data which is fed to a down counter. A timing circuit causes the down counter to be periodically preset to the value of the parallel data word and initiates the beginning of a bar graph video pulse. The down counter is decremented by a clock oscillator. When the down counter reaches the count of zero, it terminates the video bargraph pulse, thus the duration of the bargraph pulse is determined by the value of the data word preset in the down counter. The bargraph pulse is displayed on a TV display screen along with scale marking representative of percentage modulation from 0-130%. The timing circuit starts the bargraph pulse at the desired location on the screen and for the desired number of scan lines.
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Bookbinder Marc E.
Delta Electronics , Inc.
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