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    • 13. 发明公开
    • FAST DTMF IDENTIFICATION
    • SCHNELLE DTMF-IDENTIFIZIERUNG
    • EP1121786A4
    • 2007-05-30
    • EP99941106
    • 1999-08-13
    • TELOGY NETWORKS INC
    • MORGAN EDWARDMLADENOVIC ZORANPATEL PIYUSHSU QIN
    • H04L12/54H04M3/00G05B23/02H04J3/12H04L12/64H04L27/32H04M7/00H04M7/06H04Q1/30H04Q1/45
    • H04L12/6418H04L27/32H04L2012/6475H04M7/1295
    • A method of detecting control tones in a digital signal by using a tone detection unit (11) (TDU) and a packet voice protocol unit (12) (PVPU) in a network over which the signal is transmitted. The TDU (11) detects the presence of a control tone in the signal within the first 5 ms of transmission and generates an alert signal (23) to the PVPU (12) to cease further transmission of the signal. Upon confirmation, the PVPU (12) may halt the transmission and buffer or delete the voice signal packets. Alternatively, if the control tones are not present in the signal, the PVPU (12) may continue transmission of any buffered packets. The method further incorporates the sending of the control tone signal to the receiving end of the transmission of the voice packets following transmission of the control tone to the receiving end.
    • 一种通过使用在其上发送信号的网络中的音调检测单元(11)(TDU)和分组语音协议单元(12)(PVPU)来检测数字信号中的控制音调的方法。 TDU(11)在传输的前5ms内检测到信号中存在控制音调,并向PVPU(12)产生警报信号(23)以停止信号的进一步传输。 在确认之后,PVPU(12)可以停止传输并缓冲或删除语音信号分组。 或者,如果控制音调不存在于信号中,则PVPU(12)可以继续传输任何缓冲的分组。 该方法还包括在将控制音调传送到接收端之后,将控制音调信号发送到语音分组传输的接收端。