Device and method for transmitting audio signals by composite video signals in baseband manner

A composite video signal and audio signal technology, applied in the directions of image communication, selective content distribution, electrical components, etc., can solve the problems of complex implementation of the sending system and receiving system, high cost of sending and receiving devices, audio and video crosstalk, etc. The effect of reducing implementation complexity, avoiding distortion, and long transmission distance

Pending Publication Date: 2018-04-03
杭州雄迈集成电路技术股份有限公司
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  • Application Information

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Problems solved by technology

[0003] The prior art also has the following deficiencies: 1. The audio signal is frequency modulated, the sending system and the receiving system are complicated to realize, and the cost of the sending and receiving device is high
2.

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  • Device and method for transmitting audio signals by composite video signals in baseband manner
  • Device and method for transmitting audio signals by composite video signals in baseband manner
  • Device and method for transmitting audio signals by composite video signals in baseband manner

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Embodiment Construction

[0026] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but should not be construed as limiting the present application.

[0027] The present invention provides an embodiment, a device for transmitting audio signals using a composite video signal baseband, including an audio differential module, an audio modulation enabling module, and an audio modulation module, wherein the input baseband audio signal enters the audio differential module for processing and outputs audio Differential signal; audio modulation enabling module judges whether the current position is in the expected row position of the composite video signal field blanking interval based on the field counter and line counter of the composite video, and generates an enable signal; audio differential signal, composite video signal and audio modulation The enable signal is input to the audio modulation module to analyze and process and output a composit...

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Abstract

The invention discloses a device and a method for transmitting audio signals by composite video signals in a baseband manner. The device comprises an audio difference module, an audio modulation enabling module and an audio modulation module, inputted base band audio signals enter the audio difference module and are processed to output audio difference signals, the audio modulation enabling modulejudges whether a current position is positioned at an expected line position of a composite video signal field blanking interval or not based on a field counter and a line counter of a composite video and generates enabling signals, and the audio difference signals, composite video signals and audio modulation enabling signals are inputted into the audio modulation module and analyzed and processed to output composite video signals with audios. According to the device, the audio signals are transmitted in the baseband manner, frequency modulation is omitted, cost is reduced, attenuation of long-distance transmission signals is less, noise resistance is high, and crosstalk between signals is avoided.

Description

technical field [0001] The invention relates to the technical field of audio and video signal transmission, in particular to a device and method for transmitting audio signals by using a composite video signal baseband. Background technique [0002] Most of the currently existing methods of transmitting audio signals are to pre-emphasize the baseband audio signal, and then modulate the processed baseband audio signal to a higher frequency carrier by frequency modulation, the frequency is generally tens of megahertz , and then superimpose the modulated audio signal and the modulated composite video signal, so that the audio signal and the video signal are sent to the receiving end together. [0003] The prior art also has the following disadvantages: 1. The audio signal is frequency modulated, the implementation of the sending system and the receiving system is relatively complicated, and the cost of the sending and receiving device is high. 2. The frequency modulation and d...

Claims

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Application Information

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IPC IPC(8): H04N21/233H04N21/2368
CPCH04N21/233H04N21/2368
Inventor 何利蓉肖文勇
Owner 杭州雄迈集成电路技术股份有限公司
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