Digital television exciter capable of outputting multiple channels simultaneously

Abstract

This invention discloses a digital television exciter capable of outputting multiple channels simultaneously. The digital television exciter comprises a clock distribution circuit; the clock distribution circuit is connected with N clock circuits arranged in parallel connection through phase-lock loops; N is not less than 2; the clock circuits comprise reference clocks and data clocks; the reference clocks and the data clocks are arranged in parallel connection; each clock circuit is connected with a single channel processing device; the single channel processing device is connected with a signal synthesizing device and a signal post-processing device in sequence; and the clock distribution circuit, the single channel processing device and the signal post-processing device are all connected with a control system. The digital television exciter has a simple structure and a convenient usage, reduces the hardware cost of the exciter, ensures that the work efficiency of each channel can be set freely in the whole television frequency band to break the limit of the signal bandwidth and realize a true multiple-channel exciter, meets the signal transmitting requirements of the multiple channels, and achieves the multiple-channel and low-cost application of the digital television in the remote areas.

Description

technical field [0001] The invention belongs to the field of electrical equipment, in particular to a digital TV exciter that simultaneously outputs multiple channels. Background technique [0002] Most of the existing digital TV exciters are single-channel exciters, which can only meet the transmission requirements of one channel. With the emergence of multi-channel and low-cost transmission requirements in remote areas, new requirements are also put forward for the exciters. There are many ways to implement multi-channel transmission: some use multiple digital TV exciters to synthesize, but the cost increases correspondingly; Perform digital-to-analog conversion and up-conversion processing. In this way, multiple channels share one analog channel, which can save the cost of system analog circuits. However, due to the limitation of device bandwidth, there cannot be a large frequency interval between multiple channels, which cannot be realized. Multi-channel broadcasting in...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing digital TV exciters are single-channel exciters, which can only meet the transmission requirements of one channel. With the emergence of multi-channel and low-cost transmission requirements in remote areas, new requirements are put forward for the exciters.

There are many ways to implement multi-channel transmission: some use multiple digital TV exciters to synthesize, but the cost increases correspondingly; Perform digital-to-analog conversion and up-conversion processing. In this way, multiple channels share one analog channel, which can save the cost of system analog circuits. However, due to the limitation of device bandwidth, there cannot be a large frequency interval between multiple channels, which cannot be realized. Multi-channel broadcasting in the full frequency band of digital TV

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