专利名称：DIGITAL-TO-TONE CONVERTER UTILIZING A
RELAXATION OSCILLATOR
发明人：GARCIA H,US,PEEK B,US申请号：US3763322D申请日：19711001公开号：US3763322A公开日：19731002
摘要：A relaxation oscillator is formed by a Schmitt trigger circuit and an operationalintegrator circuit interconnected to form an oscillatory feedback loop. A diode switchingnetwork is constructed to receive a plural-bit digital input signal and to modify a circuitparameter in the oscillator feedback loop to adjust the frequency of oscillation inaccordance with the coding of the digital input signal. An active low-pass filter circuit isconnected to the output of the operational integrator circuit and supplies a sinusoidaltone signal to an output circuit. A switching circuit is responsive to the digital input signalfor disabling the output circuit except during the occurrence of predetermined digitalcode values.
申请人：INTEGRATED SYSTEMS TECHNOLOGY INC,US
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