Sub-miniature tone encoder with automatic number identification
First Claim
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1. A tone encoder, comprising:
- a selective switching means;
a counter for providing incrementing pulses to said selective switching means;
a clocking pulse train generator responsive to an output of said counter for incrementing said counter;
a tone burst generator for simultaneously providing two audio tone bursts; and
an isolation matrix for coupling said selective switching means to said tone burst generator whereby said selective switching means controls the frequency of the outputs of said tone burst generator.
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Abstract
A digitally synthesized tone encoder and automatic number identification generator for a radio-telephone is presented herein. The system includes a tone burst generator for producing two audio tones simultaneously in response to either a keypad input or sequencing of a multiplexer providing a single-pole eight-throw switching function in response to the incrementing of a counter.
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10 Claims
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1. A tone encoder, comprising:
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a selective switching means; a counter for providing incrementing pulses to said selective switching means; a clocking pulse train generator responsive to an output of said counter for incrementing said counter; a tone burst generator for simultaneously providing two audio tone bursts; and an isolation matrix for coupling said selective switching means to said tone burst generator whereby said selective switching means controls the frequency of the outputs of said tone burst generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification