Digital analog converting method and system based on pressure-frequency conversion |
Title: |
Digital analog converting method and system based on pressure-frequency conversion |
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Application Number: |
200510012068 |
Application Date: |
2005/07/01 |
Announcement Date: |
2005/12/21 |
Pub. Date: |
2007/09/05 |
Publication Number: |
1710622 |
Announcement Number: |
100336085 |
Grant Date: |
2007-9-5 |
Granted Pub. Date: |
2007-9-5 |
ApplicationType: |
Invention |
State/Country: |
11[China|beijing] |
IPC: |
G08C 19/36, G08C 19/16, G01D 3/00 |
Applicant(s): |
Tsinghua Univ. |
Inventor(s): |
Pang Hao, Wang Zanji |
Key Words: |
pressure-frequency conversion, digital analog converting, method, system |
Abstract: |
Through voltage-frequency conversion, the method converts analog voltage to frequency of digital impulse signal linearly. Then, through opto-electronic isolation transmission, electronic jumping number of impulse signal is determined in continuous short time interval. Finally, through filtering and stepping-down frequency obtains A/D conversion of sampled data. The system is composed of voltage-frequency conversion circuit, opto-electronic isolation circuit, counting circuit, digital filtering and stepping-down frequency circuit, and data interface connected in series. Features are: isolated measurement of signal, raised precision of A/D conversion caused by first order oversampling characteristic utilized in counting process, and linear phase characteristic to ensure undistorted sampled wave form. |
Claim: |
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Priority: |
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PCT: |
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