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System for adjusting transmission time of inputted signal of transmitter and realizing method thereof

A technology of input signal and transmission time, applied in transmission system, digital transmission system, synchronous broadcasting/distribution through multiple systems, etc., can solve problems such as time synchronization of single frequency network signals, so as to facilitate popularization and use and reduce construction costs , the effect of reducing the length

Inactive Publication Date: 2011-11-23
CHENGDU CHITONG DIGITAL SYST
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Problems solved by technology

[0004] The purpose of the present invention is to provide a system and its implementation method for adjusting the transmission time of the input signal of the transmitter. It takes a fixed time to store each bit of the digital signal, and the storage time is adjusted by adjusting the storage depth to effectively solve the problem of SFN. Time Synchronization Issues for Signal Reception

Method used

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  • System for adjusting transmission time of inputted signal of transmitter and realizing method thereof
  • System for adjusting transmission time of inputted signal of transmitter and realizing method thereof

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Embodiment

[0030] Such as figure 1 As shown, a system for adjusting the transmission time of an input signal from a transmitter, including a signal input processor, a first mixer, an AD converter, a serial-to-parallel converter, a memory, a parallel-to-serial converter, and a DA converter connected in sequence , a second mixer, and a signal output processor, wherein a frequency signal source is connected to the first mixer and the second mixer.

[0031] The signal input processor receives the radio frequency signal and filters and amplifies it. The signal processed by the signal input processor passes through the frequency conversion of the first mixer to output the intermediate frequency signal, and the AD converter takes the intermediate frequency signal output by the first mixer through sampling Converted to a high-speed digital signal, the serial-parallel converter converts the one-bit high-speed digital signal output by the AD converter into a multi-bit low-speed digital signal, and...

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Abstract

The invention discloses a system for adjusting transmission time of an inputted signal of a transmitter and a realizing method thereof. A fixed time is required for storing one bit of a digital signal, so that the storing time of the digital signal can be adjusted by adjusting the storing depth thereof, thereby efficiently solving the synchronous problem of the signal receiving of a single-frequency network. The system and the method provided by the invention are suitable for various products with different powers and are used for fully supporting a VHF (Very High Frequency) / UHF (Ultra High Frequency) frequency range and a digital television channel bandwidth in common use, thereby shortening the length of an optical fire circuit, lowering the construction cost of a network, and being beneficial to the popularization and the application of the single-frequency network.

Description

technical field [0001] The invention relates to a device and method for DTMB single frequency network networking, in particular to a system for adjusting the transmission time of a transmitter input signal and its realization method. Background technique [0002] As DTMB became the mandatory standard for terrestrial TV signals in China's broadcasting industry on August 1, 2007, all digital TV system suppliers that provide video transmission equipment for China's broadcasting industry will adopt the digital video modulation intellectual property (IP) in this standard. The DTMB single-frequency network will surely be used as an important networking method for terrestrial broadcasting and television in my country. Single Frequency Network SFN: Single Frequency Network is composed of multiple radio transmitters in different locations in a synchronized huarache flight state, transmitting the same signal at the same time and at the same frequency to achieve reliable coverage of a ...

Claims

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Application Information

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IPC IPC(8): H04H20/18H04L7/00
Inventor 张帆赖欣
Owner CHENGDU CHITONG DIGITAL SYST
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