Title:
MULTI-CHANNEL A/D CONVERTER
Document Type and Number:
Japanese Patent JP3566124
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To eliminate a noise in a commercial power supply with both 50 Hz and 60 Hz frequencies in multi-channel A/D conversion independently of the area using either of the 50 Hz or 60 Hz and to allow an A/D converter at a low cost with a comparatively long AD conversion time to be used for the multi-channel A/D conversion at less sacrifice of input response and an input value period.
SOLUTION: A multiplexer 3 selects an analog signal from channels CH1, CH2 for a scanning period of 25 ms in an anomalous scanning sequence such as CH1→CH2→CH1→CH2→CH2→CH1→CH2→CH1→CH1→CH2→CH1→CH2.... Number of use of digital signals for calculating a moving mean by moving mean calculation sections 9-1, 9-2 is selected to be 4 or a multiple of 4.
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Inventors:
Tadashi Saito
Application Number:
JP7813899A
Publication Date:
September 15, 2004
Filing Date:
March 23, 1999
Export Citation:
Assignee:
YAMATAKE CORPORATION
International Classes:
G06F3/05; H03M1/08; (IPC1-7): H03M1/08; G06F3/05
Domestic Patent References:
| JP2151917A | ||||
| JP53114653A | ||||
| JP8114632A | ||||
| JP879959A | ||||
| JP6194395A | ||||
| JP9318678A | ||||
| JP5939120A | ||||
| JP5943436A | ||||
| JP10170345A | ||||
| JP955658A | ||||
| JP60224331A | ||||
| JP2151917A | ||||
| JP7221646A | ||||
| JP10242858A | ||||
| JP5574467A | ||||
| JP943280A | ||||
| JP11248758A |
Attorney, Agent or Firm:
Masaki Yamakawa
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