Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-09-30
1987-08-04
Lall, Parshotam S.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, H03M 114
Patent
active
046849246
ABSTRACT:
A fast A/D converter using a series of A/D modules, each of which determines one or more bits of the total digital output and generates a remainder signal which serves as the input signal for the next modules in the series. In each module, one or more comparators compare the input signal to one or more predetermined bias potentials. The output of the comparators is used to generate the digital output of the module. The output of the comparators is also used to operate switches which apply either zero or the highest bias potential which does not exceed the input signal to a subtraction circuit. The subtraction circuit finds the difference between the input signal and the selected bias potential. In one embodiment this difference can be used as the remainder signal for the next module, or the difference can be multiplied before being used. Several circuits for avoiding output ripple are also disclosed.
In another embodiment, the remainder signals are repeatedly recirculated through the same A/D module.
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Black Thomas G.
Lall Parshotam S.
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