Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-07-17
1981-11-17
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347NT, 340347DA, H03K 1302
Patent
active
043014461
ABSTRACT:
Delta-Sigma noise-shaping coder with two analog integrators and Delta-Sigma decoder with two digital integrators. The coder comprises an operational amplifier with two analog integrators in its feedback loop and two cascaded flipflops both connected to the input of the operational amplifier through resistors having a predetermined ratio. The configuration of the integrators is particular and results of the identification of the z-transfer function of the coder to be designed with the p-transfer function of a known integrator (p, Laplace's variable). The decoder comprises a digital integrator-filter of order two and two cascaded flipflops both connected to the input of the filter through amplifiers having gains in a predetermined ratio.
REFERENCES:
patent: 3192371 (1965-06-01), Brahm
patent: 3659288 (1972-04-01), Taylor
patent: 3820111 (1974-06-01), Candy
patent: 3925731 (1975-12-01), Brainard
patent: 3955191 (1976-05-01), Lambourn
patent: 3956700 (1976-05-01), Condon
patent: 4009475 (1977-02-01), Defreitas
patent: 4107669 (1978-08-01), Tewksbury
patent: 4156871 (1979-05-01), Lambourn
Everard, "Electronics Letters", Jul. 22, 1976, vol. 12, No. 15, pp. 379-380.
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