Title:
METHOD AND DEVICE FOR DIGITAL SIGNAL PROCESSING
Document Type and Number:
Japanese Patent JP3191060
Kind Code:
B2
Abstract:
PURPOSE: To improve accuracy for digital data by separating the sampling noise and quantizing error noise of an analog input signal from the analog input signal.
CONSTITUTION: The analog input signal is sampled (101) and converted to a digital signal (102), the digital signal and a digital signal (105) having a value different from that of the digital signal are laternately sampled, a digital filter processing is executed, and a high frequency component is removed (103). Otherwise, a signal superimposing an AC signal at a fixed frequency to the analog input signal is sampled and converted to a digital signal (102), the digital filter processing is executed to that digital signal, and the high frequency component is removed (103). Otherwise, ΔΣ modulation is executed to the analog input signal, the digital filter processing is executed to the modulated signal, and the high frequency component is removed. Thus, the frequency areas of disturbance noise and noise caused by quantizing error can be moved to a high frequency area in the block area of a digital filter, and resolution higher than that of an A/D converter can be effectively utilized.
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Inventors:
Kido Sanan
Tomio Chiba
Junzo Kawakami
Tomio Chiba
Junzo Kawakami
Application Number:
JP2277292A
Publication Date:
July 23, 2001
Filing Date:
February 07, 1992
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H03M1/08; G06F3/05; H02H3/05; H03H17/02; H03H17/04; H03H17/06; H03M3/00; H03M3/02; (IPC1-7): H03M3/00; H03M1/08
Domestic Patent References:
| JP1288017A | ||||
| JP193215A | ||||
| JP4979452A | ||||
| JP360527A |
Attorney, Agent or Firm:
Tatsuyuki Unuma