Gateway 714 Conexant Modem Driver
Gateway gte modem cable modem pros and cons conexant linux ubuntu modem driver sb cable modem issues modem zat voice fax modem. A modem detection method is provided for use by a first gateway, the first transmitting the input signal to the second gateway according to the modem Otherwise, if tone detector confirms the beginning of the TTY character in step , . WOA2 Conexant Systems, Inc. Modem. A modem detection method is provided for use by a first gateway, the first Next, at step , tone detector receives input signal simultaneously .. Conexant Systems, Inc. Modem relay over a packet network.
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Gateway 714 Conexant Modem Driver
Furthermore, a mark hold tone is transmitted at the end of the character, which extends the length of time the Gateway 714 Conexant Modem bit is transmitted from ms to ms; however, the mark hold tone is not transmitted if the character is immediately followed by another character.
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The mark hold tone is Gateway 714 Conexant Modem to prevent the transmitting device from receiving its echo and Gateway 714 Conexant Modem it for an incoming character. As stated above, proper and timely detection of TTY modem transmissions and unobtrusive switching from voice mode to a TTY modem mode are crucial to ensure that the first character of a TTY modem transmission is not repeated or lost.
As shown, TTY modem detection system receives input signalwhich may be presented in G.
Input signal is provided to switchdelay and tone detector TTY modem detection system also includes signal processingwhich includes codecand in some embodiment, signal processing may also include TTY modem relay As stated above, G1 and G2in their default Gateway 714 Conexant Modem mode of operation, are typically set up in voice mode. For example, initially, TTY modem detection system has voice mode switch Gateway 714 Conexant Modem, such that input signal is transmitted through switch to signal processingwhich has codec selected in a compressed voice coder mode, such as G.
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In the voice mode of operation, signal Gateway 714 Conexant Modem uses codec Gateway 714 Conexant Modem compress input signal to generate output signal for transmission over packet network As shown in FIG. Delay can be a simple linear delay line of PCM samples. In one embodiment, a delay size may be equal to an amount of time needed for proper detection of the start bit frequency, e.
Tone detector is configured to detect a sufficient portion of the start bit frequency of the first character of TTY modem transmission. Tone detector may be one of a variety tone detectors, such as phase lock loop, bandpass filter with integrate and dump, cross-correlators, or other tone detectors known in the art.
In some embodiments, tone detectors may detect both mark and space frequencies to robustly detect several bits up to one character duration. Such longer detection time for switching from voice mode to TTY modem mode may be desirable in order to reduce Gateway 714 Conexant Modem rate of false detection and, thus, reduce the rate of false switching from voice mode to TTY modem mode. However, by extending the detection time to provide a robust detection, more pre-detection TTY signal may be leaked through to the remote TTY modem, and such pre-detection leakage may cause character errors for some TTY modems.
In one embodiment, to prevent such problems, TTY modem detection system may include a fast tone detector to detect tone s indicative of the onset of TTY tone s in input signal If fast tone detector detects such tone sthe notch filter is enabled, which is disabled in its default mode of operation and is placed in the path of input signal to voice mode switch In one embodiment, notch filter is a spectral Gateway 714 Conexant Modem filter for unobtrusively removing pre-detection TTY signal leakage from passing through signal processing and packet network to the remote TTY modem.
Operational flow diagram of FIG.
As shown, in stepswitch is set to voice mode switchsignal processing is set to codec compressed voice mode, e. Next, in stepswitch receives input signal and directs input signal through voice mode switch to codec of signal processing Codecwhich has been set to compressed voice mode as its default mode of operation, encodes input signal from switch path according to an encoding scheme, such as Gateway 714 Conexant Modem.
EP1571817A1 - Modem signal detection in a gateway - Google Patents
Furthermore, at stepdelay receives input signal Gateway 714 Conexant Modem with stepand delays input signal for less than start bit time, e. Next, at steptone detector receives input signal simultaneously with steps and Gateway 714 Conexant Modem, and detects space frequency of the start bit for less than start bit time, e. In stepoperational flow diagram determines whether tone detector has detected the space tone in step If the space tone is not detected, operational flow diagram reverts back to step Otherwise, if tone detector detects the space tone in stepthen operational flow diagram moves from step to step At steptone detector provides switch signal to switch and signal processing and in response, switch is switched from voice mode switch to TTY modem switchand signal processing is either switched from codec to TTY modem relay or codec selects a different coder, such as a G.
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This silence that may be caused by a mode switch from one speech coder to another, and may further be extended for an additional time, ensures that a portion of the start bit or space tone transmitted as output signal is interrupted to prevent a remote TTY modem from interpreting the transmitted Gateway 714 Conexant Modem of the start bit as the beginning of the start bit for the first character. The period of silence may be one bit time to one or two character time to prevent a false detection by a remote TTY modem.
Next, in stepdelayed signal is transmitted to signal processing through TTY modem switch of switch for transmission by signal processing over packet network As shown the timing for space frequency detection by tone detectorand mode switchwhich is a result of the space tone detection in step In the TTY modem pass-through mode, signal processing encodes delayed Gateway 714 Conexant Modem using a toll quality coder, such as a G.
In the TTY modem relay mode, however, signal processing demodulates delayed signal to generate a demodulated delayed signal, which can then be packetized and transmitted Gateway 714 Conexant Modem packet network Then, the packetized demodulated delayed signal is received by a remote gateway, depacketized, modulated according to TTY modem modulation scheme, e. In one embodiment of the present invention, operational flow diagram may optionally include a verification stepGateway 714 Conexant Modem input signal is confirmed to be a TTY modem signal.
USB2 - Text telephone modem communications over packet networks - Google Patents
For example, if signal processing is in TTY modem relay modeinput signal is demodulated and determined whether the demodulated signal is a Baudot code. If the demodulated signal does not result in a Baudot code, operational flow diagram reverts to stepwhere voice mode is selected. Similarly, if signal processing is in TTY modem pass through mode, input signal is monitored and determined whether a transition from space to mark Gateway 714 Conexant Modem detected within at least 5 bit-time i.
If no transition from space to mark is detected within such period of time, operational flow diagram reverts to stepwhere voice mode is selected. It should be noted that in some embodiments, delay can be eliminated and replaced with a tone generator that generates the space tone for a predetermined amount of time at step Yet, in another Gateway 714 Conexant Modem, delay Gateway 714 Conexant Modem delay input signal to both voice mode switch and TTY modem switch and, in such event, step can be eliminated.
In a further embodiment, a portion or all of the delay may be incorporated within signal processing