Method and arrangement for controlling delta modulator idle-chan

Details Method and arrangement for controlling delta modulator idle-chan Method and arrangement for controlling delta modulator idle-chan

1975-10-14

1977-05-24

Griffin, Robert L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 11D, H04B 1500, H03K 700

Patent

active

040258521

ABSTRACT:
The idle-channel noise of a delta modulator is controlled by controlling the relative step size imbalance, 0. The instantaneous magnitude of the delta modulator output signal is converted to a multibit word and a second multibit word, representing a predetermined number, N, is subtracted therefrom. The dc component of the difference word is converted to analog form, amplified and inverted, and fed back to the delta modulator input stage. As a result, .theta. .apprxeq. -N. The delta modulated signal may be converted to a pulse-code modulated (PCM) signal using a digital integrator having a leak, .beta., in which case .theta. .apprxeq. -.beta.N. At the same time, the dc component of the PCM signal is advantageously reduced substantially to zero.

REFERENCES:
patent: 3706944 (1972-12-01), Tewksbury
patent: 3815033 (1974-06-01), Tewksbury
patent: 3855555 (1974-12-01), Burkhard et al.
patent: 3857111 (1974-12-01), Deschenes et al.
patent: 3882484 (1975-05-01), Brokaw et al.
patent: 3899754 (1975-08-01), Brolin

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