Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1987-09-08
1988-08-30
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
358 13, H03M 136
Patent
active
047680156
ABSTRACT:
An A/D converter comprises a first reference voltage source generating a first group of reference voltages distributed in a first voltage range, and a first A/D converting circuit connected to receive an analog signal and the first group of reference voltages for generating a first digital signal. The A/D converter also includes a second reference voltage source having a bias input receiving a bias voltage and generating a second group of reference voltages which are distributed in a second voltage range smaller than the first voltage range and which are biased by a bias voltage inputted to the bias input, and a second A/D converting circuit connected to receive the analog signal mentioned above and the second group of reference voltages for generating a second digital signal. A calculator is provided to receive the first and second digital signals for generating a third digital signal having a resolution higher than that of the first digital signal. A bias voltage generator receives the third digital signal for generating an analog bias voltage to the bias input of the second reference voltage source.
REFERENCES:
patent: 3298014 (1967-10-01), Stephenson
patent: 3585631 (1971-06-01), McCown
patent: 3646548 (1972-02-01), Van Doren
patent: 4008468 (1977-02-01), Imhoff
Miller Charles D.
NEC Corporation
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