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Variable Stepsize Generator for Delta Modulation

IP.com Disclosure Number: IPCOM000081202D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Appel, U: AUTHOR [+2]

Abstract

In an earlier developed embodiment which is described in the IBM Technical Disclosure Bulletin, April 1974, Vol. 16, No. 11, on pages 3702 and 3703 a delta-modulation system having a variable step size pulse for integration is set out. In that embodiment, a high-speed clock, counter and other expensive high-speed components was used. The present description is of a simpler and less expensive device for providing pulses of varying length or number.

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Variable Stepsize Generator for Delta Modulation

In an earlier developed embodiment which is described in the IBM Technical Disclosure Bulletin, April 1974, Vol. 16, No. 11, on pages 3702 and 3703 a delta- modulation system having a variable step size pulse for integration is set out. In that embodiment, a high-speed clock, counter and other expensive high-speed components was used. The present description is of a simpler and less expensive device for providing pulses of varying length or number.

In the drawing, an up-down counter 1 is driven by a delta-modulator circuit to one of twelve distinct values in accordance with any desired algorithm, to select one of twelve different step sizes for integration. The four pairs of complementary outputs on lines 2 will, in combination, represent each of these step sizes and each combination is used to open one of the twelve gates 3 to 14, not all of which are shown. Each gate 3 to 14, when opened, will pass the signals on its remaining input line 15 to 26 to an OR 27, whose output line 28 will carry the variable step size pulse for integration.

The signals on input lines 15 to 26 are varied in characteristic, to provide outputs on line 28 having durations in the ratio of 1, 2, 3, 4, 6, 8, 12, 16, 24, 36, 48, and 64 units of time. These signals may be provided by separate twelve-pulse generators of corresponding pulse length, or may be provided with a corresponding number of pulses from signal lines having 32, 16, 8, 4, 2,...