Echo canceling modem which dynamically switches sizes of sample

Details Echo canceling modem which dynamically switches sizes of sample Echo canceling modem which dynamically switches sizes of sample

1998-09-29

2000-08-22

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Concurrent input/output processing and data transfer

710 15, 710 18, 710 52, 710 56, 370282, 370286, 379406, 379410, 375222, G06F 1300, H04B 144, H04B 138, H04M 100, H04L 516

Patent

active

061087203

ABSTRACT:
An apparatus for and method of implementing a novel buffer based full duplex communication system is disclosed. The disclosed invention is particularly useful in native signal processing systems wherein heavy contention of processor resources typically exist, such as in systems running multi-tasking operating systems. The communication system of the present invention includes a receiver, transmitter, echo canceler, CODEC and telephone hybrid. The major components of the system operate on a buffer of input samples consisting of a set of input bits. The communication system operates to generate a buffer of output samples consisting of a set of output bits. The invention utilizes a novel buffer switching mechanism to optimize the tradeoff between processing response time, on one hand, and robustness to interrupt latency and processor implementation on the other hand. The internal processing of the modem works on a buffer full of samples once every time slice thus reducing the probability of a buffer underrun/overrun error occurring. The reduction in probability of data underrun/overrun is achieved by increasing the buffer size, thus giving the operating system greater leeway in choosing the exact time the signal processing functions are run. Small buffers, however, provide the communication system with short and accurate response time. These contradicting motives lead to the novel switchable size buffer scheme of the present invention. This is achieved without a loss of signal coherency.

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Kenworthy, "Modems. (Optimizing Modern Data Flow) (World-Class Tune-Up Tips: Hardware Heaven)", CMP Publications Inc., Windows Magazine, Vol. 6, N. 7, pp. 150-152, Jun. 1995.

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