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424 条记录 (耗时 0.019 秒)

    Adjustment of call bandwidth during a communication call
    82.
    发明公开
    Adjustment of call bandwidth during a communication call 失效
    通信呼叫过程中的呼叫带宽设置

    公开(公告)号：EP0748094A3

    公开(公告)日：2003-10-15

    申请号：EP96303306.3

    申请日：1996-05-13

    申请人： AT&T IPM Corp.

    发明人： Bales, Bruce Merill ,  Thieler, Stephen Max

    IPC分类号： H04L29/06 ,  H04Q11/04

    CPC分类号： H04Q11/0428 ,  H04Q2213/13176 ,  H04Q2213/13201 ,  H04Q2213/13204 ,  H04Q2213/13216 ,  H04Q2213/13248 ,  H04Q2213/13332 ,  H04Q2213/13337

    摘要： Providing capability for increasing, decreasing, or changing types of bandwidth associated with a telecommunication call during the call and through out the call path. New messages can allocate or deallocate bandwidth associated with the call at each intervening switching node through out the call path. All switching nodes of a switching system involved with the resulting call consider the call as a single call. The new messages allow adding video capability to a voice call and, at a still later point in time, removing the video capability from the call. The result is convenience to telecommunication users in that the user is able to utilize any type or amount of bandwidth during a multimedia call. Yet, at any given point in time, the user pays only for the bandwidth that is being utilized.

    Tone detector with improved performance in the presence of speech
    83.
    发明公开
    Tone detector with improved performance in the presence of speech 失效
    Tonsignaldetektor与对话的存在改善的性能

    公开(公告)号：EP0746170A3

    公开(公告)日：2003-07-16

    申请号：EP96303620.7

    申请日：1996-05-21

    申请人： AT&T IPM Corp.

    发明人： Canniff, Ronald Jay ,  Jablway, Ali Noory

    IPC分类号： H04Q1/46

    CPC分类号： H04Q1/46

    摘要： This tone detector which is suited for dual tone multifrequency (DTMF) digit detection, separates the pairs of tones into a low frequency and high frequency group in which the other frequency group is attenuated by filtering. The amplitude of the low and high frequency groups serve as separate variable threshold reference signals. Individual tones are bandpass filtered with their corresponding outputs converted into an amplitude signal. The amplitude of the individually bandpass filtered tone signals are compared against the corresponding low or high frequency variable threshold signal for a determination of whether a tone is present. Preferably, additional validation steps are applied to the preliminary tone decisions to provide improved digit detection accuracy, especially in the presence of other signals such as speech.