Telephone network signal conversion system

Details Telephone network signal conversion system Telephone network signal conversion system

2000-09-13

2004-10-05

Barnie, Rexford (Department: 2643)

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

C379S093050, C379S093060, C379S387020, C379S392010

Reexamination Certificate

active

06801605

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the field of converting home telephone signals. In particular, the invention relates to converting data contained in telephone signals from an analog format to a digital format.
2. Description of the Related Art
Home telephone systems are typically transmitted to buildings using an analog signal. Connecting computers using telephonic systems requires data transmissions on the telephone lines. The data transmissions are transmitted at bandwidths that are different than voice transmissions. The data transmissions are usually converted from an analog format to a digital format for use with a computing system using digital data.
FIG. 4
illustrates a conversion circuit
400
typically used to convert analog data in telephone lines into a digital signal for use with computing systems. The system includes an amplifier
410
that receives an analog input signal from the telephone line. The amplifier
410
reduces the detection of noise on the telephone line. The comparator
420
receives the signal and compares the signal to an analog threshold. The output from the comparator
420
is a signal having a digital format. The digital signal is signaled to feedback circuit
430
. The feedback circuit
430
processes the signal to determine a digital threshold. A digital-analog converter
440
converts the digital threshold to an analog value. The analog value is used by comparator
420
to form the digital signal with the signal received from amplifier
410
.
SUMMARY OF THE INVENTION
An integrated circuit is provided that samples analog telephone signals. A plurality of shifters store analog values sampled from the telephone signals at discrete time intervals over a duration. A plurality of shifters each carry an analog value for one of the sampled intervals during the duration. Each analog value is propagated through the shifters during the duration. An averager is coupled to the plurality of shifters to determine an average of the analog values carried by the shifters during each interval in the duration. A comparator is coupled to the averager


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patent: 5773332 (1998-06-01), Glad
Gihad Ghaibeh, ed. (1999), “Home Phoneline Networking Alliance: 1 M8 PHY Specification”, version 1.03 (50 pages).
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