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Time Multiplex Filter

IP.com Disclosure Number: IPCOM000096462D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Thrasher, PM: AUTHOR

Abstract

In this division multiplexed communication system, a time multiplexed filter is inserted in the common time multiplexed circuit. A number of input channels 10, 12 and 14 are connected to a number of output channels 30, 32 and 34 through time multiplexed switches 15, 16 and 17, and 18, 19 and 20 via a common time multiplexed circuit 21. All ins puts enter a low-pass filter 22, 23 and 24, for each input to properly band-limit the inputs before sampling. Each output from the output switches 18, 19 and 20 is passed through a low-pass filter 2S, 26 and 27 which recovers a continuous function from the pulse amplitude modulated signals. The switches 15, 16 and 17 are closed and opened sequentially to sample each of the corresponding input lines 10, 12 and 14. Circuit 21 transmits the pulses to the outputs.

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Time Multiplex Filter

In this division multiplexed communication system, a time multiplexed filter is inserted in the common time multiplexed circuit. A number of input channels 10, 12 and 14 are connected to a number of output channels 30, 32 and 34 through time multiplexed switches 15, 16 and 17, and 18, 19 and 20 via a common time multiplexed circuit 21. All ins puts enter a low-pass filter 22, 23 and 24, for each input to properly band-limit the inputs before sampling. Each output from the output switches 18, 19 and 20 is passed through a low-pass filter 2S, 26 and 27 which recovers a continuous function from the pulse amplitude modulated signals. The switches 15, 16 and 17 are closed and opened sequentially to sample each of the corresponding input lines 10, 12 and 14. Circuit 21 transmits the pulses to the outputs. The switches 18, 19 and 20 are closed sequentially to allow only the pulses from a particular input source to pass through a low-pass filter to the output line at one time. This operation is the same as in a conventional time division multiplexed system. The time multiplexed filter placed in series with circuit 21 allows the monitoring of each input signal. This is by filtering that signal out of the train of pulses on circuit 21.

The filter has equal time delay sections 35 and an adjustable summing network of potentiometers 36... 44. Mathematically, the filtering action approximates the convolution integral. The potentiometers are adjusted to pr...