Delta modulator having increased dynamic range

Details Delta modulator having increased dynamic range Delta modulator having increased dynamic range

H - Electricity

03

M

354/69

H03M 3/02 (2006.01)

Patent

CA 1051119

DELTA MODULATOR HAVING INCREASED DYNAMIC RANGE ABSTRACT Delta modulator wherein a digital output signal is produced from an analog modulating signal, with the digital signal being filtered and compared with the modulating sig- nal to produce an error signal for controlling the modu- lator, and wherein the filtered digital signal is fed back to the comparator through a nonlinear circuit which de- creases the amplitude of small amplitude signals being fed back. The nonlinear circuit may have a first linear response portion for translating signals below the normal threshold of the modulator, and a second linear response portion for signals above the normal threshold, with the gain of the second portion being substantially greater than that of the first portion. Since the signal fed back is smaller than it would otherwise be for weak signal conditions, less input signal is required to establish adequate error voltage to operate the delta modulator, thus extending the dynamic range to signal levels too weak to operate a known delta modulator. The nonlinear circuit may include first and second parallel paths, with a transistor stage in one path having means rendered oper- ative at a given signal level to limit the output, so that at low signal levels the signal is translated without substantial attenuation and at high signal levels the signal is attenuated. The signal in the path including the trans- istor stage acts to cancel a portion of the signal in the other path to control the signal fed back from the filter to the comparator, to increase the signal fed back at high level digital outputs. -1-

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