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One-time modulation and co-frequency synchronization transfer method and system of audio and video signals

A technology of signal modulation and synchronous transmission, applied in the direction of multi-carrier simultaneous transmission of TV signals, etc., can solve problems such as signal interference and distortion, and achieve the effect of solving interference noise, reducing investment cost of hardware equipment, and solving interference and distortion.

Active Publication Date: 2009-07-01
北京中视同频科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention provides a method and system for synchronous transmission of one-time modulation and same frequency of audio and video signals, which are used to solve the problem of signal interference and distortion existing in the existing multi-point modulation and same-frequency signal transmission

Method used

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  • One-time modulation and co-frequency synchronization transfer method and system of audio and video signals
  • One-time modulation and co-frequency synchronization transfer method and system of audio and video signals
  • One-time modulation and co-frequency synchronization transfer method and system of audio and video signals

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Effect test

Embodiment 1

[0084] When the audio and video signal is a stereo broadcast signal, such as Figure 5 As shown, the specific steps of using the inventive method to realize the modulation and synchronous transmission of the stereo broadcast signal are as follows:

[0085] S501. Convert the stereo broadcast signal into a composite signal;

[0086] The stereo broadcast signal is converted into the composite signal by a stereo encoder;

[0087] S502. Modulate the composite signal into an F1 carrier frequency signal;

[0088] That is, the composite signal is modulated onto the carrier frequency F1 via the carrier frequency transmitter, and the F1 carrier frequency signal is transmitted to each adjacent transmitting base station;

[0089] S503. Convert the F1 carrier frequency signal into an F2 intermediate frequency signal;

[0090] Amplify and convert the F1 carrier frequency signal to generate an F2 intermediate frequency signal;

[0091] S504. Filter the F2 intermediate frequency signal; ...

Embodiment 2

[0103] When the audio and video signal is a stereo broadcast signal, such as Figure 6 As shown, the system for implementing a modulation and synchronous transmission of the stereo broadcast signal by using the present invention includes:

[0104] Stereo broadcast signal modulation network 616;

[0105] The stereo broadcast signal modulation network 616 is used to modulate the original stereo broadcast signal into a carrier frequency signal transmitted by each adjacent transmitting base station, and send the carrier frequency signal to each adjacent transmitting base station. The stereo broadcast signal modulation network 616 Also includes: stereo encoder 601, carrier frequency transmitter 602;

[0106] Transmitting base station A608;

[0107] The transmitting base station A608 includes: a carrier frequency conversion unit A607 and a transmitter A606;

[0108] The carrier frequency conversion unit A607 includes: a carrier frequency conversion unit A603, an intermediate freq...

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Abstract

The invention discloses a wireless audio and video signal one-time modulation co-frequency synchronous transmission method and system to solve the problem of interference and distortion of audio and video signals during co-frequency transmission. The method includes the following steps: A. Modulating the audio and video signals into a first After the carrier frequency signal is sent to each adjacent transmitting base station; B, the first carrier frequency signal is converted into the second carrier frequency signal used by each adjacent transmitting base station; C, each adjacent transmitting base station transmits the second carrier frequency signal The signal is transmitted to the receiving end; step B includes the following steps: B1, converting the first carrier frequency signal into an intermediate frequency signal; B2, filtering the intermediate frequency signal; B3, performing phase-locked frequency synthesis on the filtered signal to generate a second carrier frequency signal. The invention is used for one-time modulation and synchronous transmission of audio and video signals at the same frequency, so as to achieve the effects of less interference at the same frequency and cost saving.

Description

technical field [0001] The invention relates to the field of audio and video signal transmission, in particular to a method and system for one-time modulation and synchronous transmission of audio and video signals. Background technique [0002] In order to achieve large-area coverage of audio and video signals (broadcast signals, television signals, etc.), a common method is to use multiple transmitters to transmit audio and video signals at the same frequency. In order to achieve synchronous reception in the cross area of ​​the audio and video signals of adjacent transmitters, the frequency, phase and modulation degree of the signals of adjacent transmitters must be the same. [0003] Such as figure 1 As shown, the prior art audio and video signal co-frequency transmission technical scheme is as follows: [0004] Convert the audio and video signal to the transmission carrier frequency through the modulator; [0005] The signal is transmitted to each adjacent transmittin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/06
Inventor 周颖平张煜洪
Owner 北京中视同频科技有限公司
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