发明名称 DIGITAL COIN CIRCUIT
摘要 <p>A circuit which allows a digital network telephone central office to provide coin telephone service without analog-to-digital converters. This circuit controls the transmission of digital data representative of coin telephone control signals. Shift registers are used to store this data for asynchronous transmission to a coin telephone, under control of gating logic circuits which insert one bit periodically in preselected frames of data sent to a coin telephone.</p>
申请公布号 CA1124418(A) 申请公布日期 1982.05.25
申请号 CA19780313690 申请日期 1978.10.18
申请人 GTE AUTOMATIC ELECTRIC LABORATORIES INCORPORATED 发明人 STELTE, DAVID J.
分类号 H04J3/12;H04M17/02;H04Q11/04;(IPC1-7):04J3/12;04M17/02 主分类号 H04J3/12
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