Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1987-08-10
1988-05-10
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347CC, H03M 166
Patent
active
047438851
ABSTRACT:
A cyclic type D/A converter having an error detection and correction system including: a code conversion circuit for converting a binary code to a multi-states code; a digital-to-analog conversion circuit connected to the code conversion circuit for converting the multi-states code to an analog value; a detection circuit operatively connected to the digital-to-analog conversion circuit for converting the analog value to a digital code; and a control circuit operatively connected to the code conversion circuit, digital-to-analog conversion circuit and detection circuit for calculating a voltage difference between the analog value at a predetermined code value and another analog value adjacent to the predetermined code value, and for calculating a differential non-linearity error from the voltage difference based on the digital code, in order to obtain error and correction values of capacitors forming the digital-to-analog conversion circuit.
REFERENCES:
patent: 4622536 (1986-11-01), Shih
patent: 4706066 (1987-11-01), Dijkmans
IEEE 1986 Custom Integrated Circuits Conference, pp. 366-369.
Gotoh Kunihiko
Kobayashi Osamu
Shimizu Yoshiaki
Fujitsu Limited
Miller Charles D.
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