Efficient hardware implementation for signal reconstruction over multiple analog-to-digital, digital-to-analog conversions in a telecommunication system
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United States of America Patent
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Apr 26, 2005
Grant Date -
N/A
app pub date -
Mar 16, 2001
filing date -
Mar 17, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for providing an improved quality voice band channel equalization in telecommunication systems employing v.90 transmission standard in which PCM modem signals passing through a digital-to-analog and analog-to-digital conversion processes between a central office switch and a multiple subscriber access system may be reconstructed with improved quality at the A/D converter side by variably adjusting the gain between the digital-to-analog conversion process at the central office switch and the analog-to-digital conversion process at the multiple subscriber access system, and low pass filtering the signal using a second order low pass notch filter to provide a boost of 6 dB at a frequency of 4 KHz.
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