US 4,103,238 AGranted

Transmitter modulated with three modulation patterns

AssigneeThe Alliance Manufacturing Company, Inc.

InventorsAndrew F. Deming, James B. Russell

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Abstract

An encoding transmitter is disclosed which includes a modulator providing a means to modulate a carrier wave selectively with a first or a second modulation frequency or pattern to provide first and second modulation patterns respectively. Also a third modulation pattern may be established by providing successive portions of the first modulation frequency and the second modulation frequency during a given time period. A data selector is controlled by data select control signals which are obtained from a counter counting from the first modulation frequency signal. Programmable means include a multi-position switch to program the input channels of the data selector so as to control whether the first or the third modulation pattern is that which modulates the carrier wave during any given unit of time.

Claims23

Dependent claims

A modulated carrier wave transmitter comprising in combination;

a carrier generator to generate a carrier wave;
means establishing first and second different modulation frequencies;
means establishing time sequential control signals;
modulation means connected to modulate said carrier wave by said first and second modulation frequencies in first, second and third modulation patterns, comprising;
first means connected to modulate said carrier wave with said first modulation frequency in accordance with said sequential control signals to establish said first modulation pattern of said carrier wave for at least one bit period, a bit period being the time period required for the transmission of one complete interval of the first, second or third modulation pattern,
second means connected to modulate said carrier wave with said second modulation frequency in accordance with said sequential control signals to establish said second modulation pattern of said carrier wave for at least one bit period,
and third means connected to modulate said carrier wave with said first modulation frequency and sequentially with said second modulation frequency in accordance with said sequential control signals to establish said third modulation pattern of said carrier wave for at least one bit period, the signal being transmitted containing all three modulation patterns.

4 more elements

An encoding transmitter comprising in combination;

an encoder having an output and including, oscillator means to generate a first audio frequency signal,
counter means connected to said oscillator to establish a second audio frequency signal, a bit signal and a set of data select control signals,
said second audio frequency signal being 1/x times the frequency of said first audio frequency,
said bit signal being 1/y times the frequency of said second audio frequency,
said set of data select control signals having Z number of output states, wherein X, Y and Z are numerals,
a data selector having a plurality of input channels, one output and control means connected to said data select control signals,
programmable means to program the input channels of said data selector,
a synchronization bit decoder connected to said counter means to decode one count of said Z number of output states,
output selector means connected to said oscillator and to said counter means to select said first and second audio signals on the output of said encoder,
and an output decoder having three input signals one each connected to said counter bit signal, said data selector and said sync bit decoder and having an output connected to said output selector means,
said bit signal comprising a first and a second complementary portion,
and said output decoder establishing first, second and third bit patterns on the output of said encoder with said first bit pattern comprising said first audio signal during both portions of a bit, said second bit pattern comprising said second audio signal during both portions of a bit, and said third bit pattern comprising one of said audio signals during said first portion and the other of said audio signals during said second portion of a bit,
one of said bit patterns being a synchronization bit another being a logic one bit and the third being a logic zero bit,
and a carrier generator modulated by said encoder output.

11 more elements

An encoding transmitter comprising in combination;

an encoder having an output and including, means to generate a first and a second audio frequency and a bit signal,
said second audio frequency being 1/x times the frequency of said first audio frequency,
said bit signal being 1/y times the frequency of said second audio frequency, wherein X and Y are numerals,
said bit signal comprising first and second complementary portions,
and means including an output decoder connected to said generator means and establishing first, second and third bit patterns on the output of said encoder with said first bit pattern comprising said first audio frequency during both portions of a bit, said second bit pattern comprising said second audio frequency during both portions of a bit, and said third bit pattern comprising one of said audio frequencies during said first portion and the other of said audio frequencies during said second portion of a bit,
one of said bit patterns being a synchronization bit another being a logic one bit and the third being a logic zero bit;
and a carrier generator modulated by said encoder output.

4 more elements

Dependencies are inferred from the claim text.