会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 3. 发明授权
    • Apparatus for interfacing analog telephone in ISDN terminal adapter
    • 用于在ISDN终端适配器中连接模拟电话的装置
    • US5459788A
    • 1995-10-17
    • US340440
    • 1994-11-14
    • Ho-jun Kim
    • Ho-jun Kim
    • H04M1/00H04M1/738H04M11/00H04M11/06H04Q11/04H04J3/12
    • H04Q11/0471H04Q2213/034H04Q2213/08H04Q2213/09H04Q2213/093H04Q2213/18H04Q2213/405
    • An apparatus for interfacing an analog telephone in an ISDN terminal adapter is able to independently perform call set-up regardless of a personal computer's operation, while being provided with ISDN audio service via an existing analog telephone. The apparatus includes a combocodec for converting a digital audio signal from the co-processor into an analog audio signal to supply it to a telephone, and for digitizing an analog audio signal from the telephone to supply it to the co-processor; a ring generator for generating a ring signal under the control of the co-processor; and a DC-voltage converter for generating a telephone driving voltage. A subscriber line interfacing circuit (SLIC) is connected to a telephone, a DC-voltage converter, and a combocodec, for supplying the telephone driving voltage to the telephone, interfacing the audio signals between the telephone and combocodec, and sensing the office line to determine the telephone's hook state. A relay is connected among the SLIC, ring generator, and the telephone, for supplying the ring signal from the ring generator to the telephone under the control of the SLIC. A tone decoder is provided for decoding a dual tone multi-frequency signal from among the audio signals from the SLIC to the combocodec, and transmitting the decoded signal to the co-processor.
    • 用于在ISDN终端适配器中连接模拟电话的装置能够独立地执行呼叫建立,而不管个人计算机的操作如何,同时经由现有的模拟电话提供ISDN音频服务。 该装置包括用于将来自协同处理器的数字音频信号转换成模拟音频信号以将其提供给电话并将来自电话的模拟音频信号数字化以将其提供给协处理器的组合数字转换器; 环形发生器,用于在协处理器的控制下产生振铃信号; 以及用于产生电话驱动电压的直流电压转换器。 用户线路接口电路(SLIC)被连接到电话机,直流电压转换器和组合电话机,用于将电话驱动电压提供给电话机,将电话和组合音频信号之间的音频信号进行接口,并将办公室线路 确定电话的挂机状态。 在SLIC,环形发生器和电话之间连接一个继电器,用于在SLIC的控制下将环形发生器的振铃信号提供给电话。 提供一种音频解码器,用于从SLIC到组合音频信号之间的双音多频信号解码,并将解码信号发送到协处理器。