GATEWAY 510 CONEXANT MODEM DRIVER DETAILS:
|File Size:||29.0 MB|
|Supported systems:||Windows Vista, Windows Vista 64-bit, Windows XP 64-bit, Mac OS X, Mac OS X 10.4, Mac OS X 10.5|
|Price:||Free* (*Free Registration Required)|
GATEWAY 510 CONEXANT MODEM DRIVER
According to one embodiment of the present invention, a filter, such as a narrow band pass or a notch filter, is used to filter out the answer tone, such as the Hz answer tone, at second gateway device As shown in FIG.
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Although only a portion of the elements of second gateway device is shown, for brevity, block will be referred to as gateway device As shown, echo canceller receives signal as input Gateway 510 Conexant Modem telephone line Echo canceller improves detection performance by mitigating echo and is well known in the art. Echo canceller output is filtered by notch filter that is centered at Hz.
Notch filter output is coupled to input of speech encoder Speech encoder output is then sent across IP Generally, the majority of modem answer tones are around Hz frequency. However, there are some modems that have answer tones that use a different frequency, such as Bell standard compatible modems. It will be appreciated by those skilled in the Gateway 510 Conexant Modem that one or more notch filters may be used to block one or more frequencies.
When notch filter is placed in the signal Gateway 510 Conexant Modem, it prevents all or substantially all of the answer tone from reaching first gateway device and first communication device It should be appreciated that various designs of notch filters are known in the art  In another embodiment not shownnotch filter may precede echo canceller in FIG 2, such that notch filter receives telephone line signal before it reaches echo canceller and an output of notch filter is then fed into echo canceller coupled to speech encoder Furthermore, in yet another embodiment similar to that of FIG.
In such event, in one embodiment, notch filter may be enabled for a pre-determined amount of time, e.
As stated above, modem answer tones, in general, last about three to four seconds and are generated by M2 upon answering the call. If the Gateway 510 Conexant Modem tone is substantially blocked by notch filterthen Ml will continue to wait until Gl and G2 switch over, in order to properly handle a modem or facsimile communication. Although only a portion of the elements of second gateway device is shown, for brevity, block will be referred to as gateway device herein.
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As shown, echo canceller receives telephone line signal as input from telephone line Echo canceller output is filtered by notch filter that, in one embodiment, is centered at Hz if notch filter is enabled by fast tone detector Notch filter output is further coupled to an input of speech encoder In another embodiment, fast tone detector may receive input signal from echo canceller instead of receiving telephone line signal If fast tone detector detects that input signal or is a Hz tone, then fast tone detector enables notch filter by way of notch filter control signalotherwise notch filter is disabled by way of notch filter control signal In one embodiment, fast tone detector enables notch filter if fast tone detector detects about milliseconds of answer tone. As noted above, typically, modems confirm presence of an answer tone for several hundreds milliseconds prior to considering Gateway 510 Conexant Modem answer tone as valid Those of ordinary skills in the art are familiar with a variety of fast tone detectors and implementation of such detectors.
Further as described in conjunction with FIG.
In such event, fast tone detector and notch filter would receive telephone line signal As shown, flow diagram of FIG. Next, in stepfast tone detector is Gateway 510 Conexant Modem for fast detection of answer tone. In stepfast tone detector debounces telephone line signal for ms to determine presence of ms of answer tone in telephone line signal An analysis window of ms of telephone line signal provides a sufficient window of samples for fast tone detector to detect a tone.
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