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A kind of digital demodulation method for broadcast signal

A demodulation method and broadcast signal technology, applied in the field of digital demodulation of broadcast signals, can solve problems such as affecting fairness

Active Publication Date: 2022-07-01
天津芯盟微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method provides opportunities for bad behaviors such as listening cheating. At the same time, it is easy for some students to affect the fairness of the exam due to the performance difference of the earphones.

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  • A kind of digital demodulation method for broadcast signal
  • A kind of digital demodulation method for broadcast signal
  • A kind of digital demodulation method for broadcast signal

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Embodiment Construction

[0029] In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions of the present invention are further described below with reference to specific embodiments.

[0030] Referring to the accompanying drawings, a digital demodulation method for broadcast signals, the demodulation system mainly includes a carrier sense module, a digital frequency and phase detection module, a soft threshold demodulation output module, a dynamic addition and subtraction pulse module, a digital Fractional order frequency control module, digitally controlled oscillator module and frequency divider.

[0031] Carrier sense module: It is used to identify whether the signal sent by the speaker array is a useful signal. If it is a useful signal, it will give an enable signal to the digital frequency and phase detection module and the soft threshold demodulation output module to make it work. is not a useful signal, it does not work.

[0032...

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Abstract

The invention discloses a digital demodulation method for broadcast signals. The demodulation system mainly includes a carrier detection module, a digital frequency and phase detection module, a soft threshold demodulation output module, a dynamic addition and subtraction pulse module, a digital Fractional order frequency control module, digitally controlled oscillator module and frequency divider. The demodulation method of the present invention can realize the digital demodulation of the acoustic signal, and is composed of a digital frequency discrimination and phase discrimination module, a dynamic addition and subtraction pulse module, a digital fractional order frequency control module, a digital control oscillation module and a frequency divider. The digital phase-locked loop realizes the locking of the input signal, and outputs "1" and "0" through the soft threshold demodulation output module to control the final digital output.

Description

technical field [0001] The invention belongs to the technical field of signal demodulation, and in particular relates to a digital demodulation method for broadcast signals. Background technique [0002] In recent years, with the development of digital circuits, the application of loudspeakers has become more and more extensive, including campuses, concert halls, commercial plazas, theaters, aircraft and vehicles, etc. During the data transmission process of the speaker array, the traditional demodulation method will inevitably cause data loss and distortion, and adding a digital phase-locked loop demodulation to the sound source array not only makes the loop have a short locking time, high precision, It has the advantages of small synchronization error and high circuit stability, while avoiding the shortcomings of analog circuit DC zero drift and low reliability. A digital phase-locked loop is a discrete-time device, so phase changes are inevitable. [0003] The original ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H03L7/113
Inventor 陈劲朱红利佟颖关升陈彩娟
Owner 天津芯盟微电子技术有限公司