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    • 3. 发明授权
    • Cordless telephone
    • 无绳电话
    • US5915227A
    • 1999-06-22
    • US119648
    • 1998-07-21
    • Hideo HikumaKunihiro TakahashiKatsuhiko OtsujiHiroyuki IshidaMasayasu FujinoYuzo Ishida
    • Hideo HikumaKunihiro TakahashiKatsuhiko OtsujiHiroyuki IshidaMasayasu FujinoYuzo Ishida
    • H04M1/00H04B7/26H04M1/725H04Q7/38H04Q7/26
    • H04M1/72508H04M1/72505
    • A cordless telephone consisting of base and handset units is disclosed wherein a control circuit incorporated in the base unit comprises first and second D/A converters, first and second A/D converters, and first and second sync. signal generation circuits. The first and second D/A converters respectively convert digital signals from the handset unit and a PBX. The first and second A/D converters convert the analog signals provided from the first and second D/A converters to transmit them to the PBX and handset unit, respectively. The first sync. signal generation circuit regenerates a first clock signal synchronously with a sync. signal provided from the PBX to render the first A/D and second D/A converters to operate in synchronism with the sync. signal from the PBX. The second sync. signal generation circuit generates a second clock signal which is independent of the sync. signal from the PBX to render the first D/A and second A/D converters to operate in synchronism with the second clock signal. Accordingly, the synchronization between the base and handset units is effected independently of the synchronization signal from the PBX.
    • 公开了一种由基座和手机单元组成的无绳电话,其中并入基地单元中的控制电路包括第一和第二D / A转换器,第一和第二A / D转换器以及第一和第二同步。 信号发生电路。 第一和第二D / A转换器分别转换来自手机单元和集团电话的数字信号。 第一和第二A / D转换器将从第一和第二D / A转换器提供的模拟信号转换成分别将它们发送到PBX和手机单元。 第一次同步 信号发生电路与同步同步地再生第一时钟信号。 信号从PBX提供,以使第一A / D和第二D / A转换器与同步同步操作。 来自集团电话的信号。 第二次同步 信号发生电路产生独立于同步的第二时钟信号。 来自PBX的信号,以使第一D / A和第二A / D转换器与第二时钟信号同步地工作。 因此,基站和手持机单元之间的同步独立于来自PBX的同步信号来实现。