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SIGNAL SYNTHESIZER FOR GENERATING SINE WAVE SIGNAL FORM BINARY SIGNAL SOURCE
SIGNAL SYNTHESIZER FOR GENERATING SINE WAVE SIGNAL FORM BINARY SIGNAL SOURCE
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机译:生成正弦波信号形式的二进制信号源的信号合成器
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摘要
A solid state signal generator for producing frequency combinations such as used in multi-tone telephone systems. The output of a crystal oscillator is divided to obtain binary signals proportional to the selected pairs of the seven multi-tone frequencies. These signals are scaled with selected binary output signals generated by a free-running pattern generator and representing slopes at various points on a sine wave to produce a binary signal stream that is applied to a controlled charge digital-to-analog conversion circuit that partially charges or discharges a capacitor in accordance with the binary 1's and 0's to produce an output waveform across the capacitor that corresponds to the combined pair of selected individual tone frequency sinusoids.
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