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Fixed time-interval sampling interpolation calculating method and apparatus thereof

A technology of fixed time and calculation method, which is applied in the direction of calculation, calculation and instrument expressed by the number system, and can solve the problems that cannot be randomly sampled

Inactive Publication Date: 2003-10-15
SHANGHAI FUDAN MICROELECTRONICS GROUP
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  • Description
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  • Application Information

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Problems solved by technology

[0005] For the existing fixed time period sampling analog-to-digital conversion circuit, especially the Σ-Δ analog-to-digital conversion circuit, in order to overcome the deficiency that it cannot be randomly sampled, the present invention provides a circuit of interpolation method, which is integrated with the analog-to-digital converter In the same circuit, the sampling value at any time can be obtained

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  • Fixed time-interval sampling interpolation calculating method and apparatus thereof
  • Fixed time-interval sampling interpolation calculating method and apparatus thereof
  • Fixed time-interval sampling interpolation calculating method and apparatus thereof

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0032] exist figure 1 , the input analog signal (10) is sampled by the analog-to-digital conversion circuit (1), and stored in the sampled value register DR1 (3), while the original sampled value in DR1 is stored in DR2 (4), and the original sampled value in DR2 The value is saved to DR3(5). In this way, the latest three sampling values ​​are always stored in DR1, DR2 and DR3. At the same time of each sampling, the counter (2) is cleared and the clock (11) is counted to record the minimum number of cycles N from the internal sampling time to the external triggering time c .

[0033] If the linear / secondary interpolation algorithm selection pin (14) is high level, then the selected interpolation method is linear interpolation. The minimum number of cycles N that pre-saves the sampling interval in NR2 s . at t c At this time, the extern...

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Abstract

The present invention is one kind of digital interpolating calculation method and device sampling in fixed time interval. In available technology, it is impossible to input the analog signal sampling value in some moment between two sampling times. The present invention is adopted in fixed time interval sampling ADC circuit to obtain the sample result in any moment. Minimum HF period number produced is used in measuring time, and the sampled values around the outer triggering signal moment are used in calculating the value corresponding the triggering moment based on interpolation formula in optional linear or second interpolation method. The interpolating calculation device consists of digital circuits, including six registers and one algebraic arithmetic unit comprising adder, multiplier, shifter and divider.

Description

technical field [0001] The invention relates to a method and device for performing digital interpolation calculation on data obtained by sampling at fixed time intervals, which is used in an analog-to-digital conversion circuit for sampling at fixed time intervals, thereby obtaining sampling results at any time. Background technique [0002] At present, all kinds of electronic measurement or control devices need to use analog-to-digital conversion circuits to convert analog signals into digital signals. This process is called sampling. For an analog-to-digital conversion circuit sampling at equal time intervals, such as an analog-to-digital conversion circuit using Σ-Δ modulation, the sampling process is performed once at a fixed time interval. This time period is determined by the sampling clock, so it is difficult to change at any time. In the process of this fixed time period, it is impossible to obtain the sampling value of the input analog signal at a certain moment be...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F7/00G06F7/38
Inventor 赵磊李清
Owner SHANGHAI FUDAN MICROELECTRONICS GROUP