Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1992-12-28
1994-09-20
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341143, H03M 166
Patent
active
053493532
ABSTRACT:
A digital processing circuit and method includes a signal modulator connected to modulate a delta-modulated first input signal with a digital second input signal to produce a delta modulated output pulse stream. The digital output can be directly used for many purposes, or the digital output can be demodulated to produce an analog output signal using a low pass filter. Also, if desired, the delta modulated pulse first pulse stream can be generated from an analog signal input through use of a sigma-delta modulator. The signal modulator includes a plurality of switches, each operated by a respective bit of the digital second input signal to switch between the delta modulated first input signal and a known pulse sequence, such as an idle sequence, for delivery to a switch output. A plurality of adder circuits are connected in series to add the successive outputs of the plurality of switches to the delta modulated pulse first input signal to produce the delta modulated output pulse stream. Each of the adder circuits comprises a full binary adder and a D-type flip-flop, the full binary adder having two binary signal inputs and a carry input, and having a sum output and a carry output, the sum output being connected to the carry input through the D-type flip-flop. The known pulse sequence, such as the idle sequence is connected to the input of the first adder circuit. The circuit can be used for many purposes, for example, to provide a multiplying digital-to-analog signal converter, a precision attenuator, or the like, without a requirement for precision components, circuit matching or other special analog signal matching techniques.
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Bachand Richard A.
Young Brian K.
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