Pulse or digital communications – Testing – With indicator
Patent
1993-06-16
1996-05-14
O'Shea, Sandra L.
Pulse or digital communications
Testing
With indicator
375229, 333 18, 333 28R, H03G 1104, H03G 500
Patent
active
055175236
ABSTRACT:
An equalizer (100) is suitable for removing the delay distortion from a switched digital signal received from a telephone channel, where the delay distortion is caused by a bridge-tap connected to the telephone channel. The equalizer includes a feedback delay circuit (200) which is arranged to delay the output signal (150) by an amount of time based on the square of the predominant frequency of the output signal. The resulting delayed feedback signal (130) is then combined with the input signal, thereby compensating for the delay distortion. The equalizer also includes an amplifier (103) which may be adjusted to compensate for the attenuation distortion caused by the bridge-tap.
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Nabors David H.
Nelson David P.
Gamburd Nancy R.
Motorola Inc.
Ning John
O'Shea Sandra L.
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