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Random demodulation and sampling method based on pulse width modulation

A technology of random demodulation and pulse width modulation, applied in analog-to-digital converters, electrical components, code conversion, etc., can solve problems such as high power consumption and large volume of analog-to-digital converters, and achieve the effect of improving stability

Active Publication Date: 2019-03-29
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The signal acquisition method guided by the Nyquist sampling theorem has led to the problems of large size and high power consumption of the analog-to-digital converter, which is facing great challenges

Method used

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  • Random demodulation and sampling method based on pulse width modulation
  • Random demodulation and sampling method based on pulse width modulation
  • Random demodulation and sampling method based on pulse width modulation

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Embodiment

[0065] Since the PN sequence is a sequence composed of 1 and -1, the present invention adopts the form of digital coding, which is not easy to represent negative numbers. Therefore, when sampling, it needs to be divided into two channels to sample the input signal. The actual application circuit block diagram is as image 3 Shown. The input signal takes the ECG signal as an example, the output waveform of each device in the circuit is as Figure 4 As shown, the modulation signal generator outputs two modulation signals W1 and W2, corresponding to 1 and -1 of the PN sequence respectively. Due to the different modulation signals, the PWM waves output by the two comparators are also different. The two counters output y1[m] and y2[m] respectively, and input them to the host computer through the serial port, and use the subspace basis tracking algorithm to complete the signal reconstruction on the matlab platform.

[0066] In the actual realization process, the input signal x[n] adop...

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Abstract

The invention relates to a random demodulation and sampling method based on pulse width modulation. A conventional ADC is replaced by a comparer and a counter, and functions needing to be realized byan observation matrix are finished. A saw-toothed modulation signal is controlled by a PN sequence, an input signal is modulated through utilization of the comparer, a PWM wave is generated, the PWM wave is taken as a count signal of the counter, and the count signal is used for controlling the count of the counter. Through application of the steps, amplitude information of the input signal is converted into time information. Compared with a conventional, compression and sampling system, the system has the advantage that in a digital coding mode, stability is greatly improved. The system is high in stability, low in power consumption and small in size, so the system has good application prospect in low cost collection equipment, a medical apparatus, a portable terminal and the like.

Description

Technical field [0001] The invention relates to a random demodulation sampling method based on pulse width modulation. Background technique [0002] With the rapid development of electronic information technology, digital systems have become the mainstream of modern electronic systems. The analog-to-digital converter (ADC) is responsible for the digitization of analog signals and is an indispensable part of modern systems. In recent years, with the widespread development of electronic information technology, various terminals have increasingly been miniaturized and portable. The signal acquisition method guided by the Nyquist sampling theorem has led to the problems of large volume and high power consumption of analog-to-digital converters, and is facing huge challenges. We know that the Nyquist sampling theorem is a sufficient condition to restore the original signal without distortion, not a necessary condition. In recent years, experts and scholars in the field of digital s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30H03M1/12
CPCH03M1/1245H03M7/3062
Inventor 钱慧叶志钦洪宝玲
Owner FUZHOU UNIV