Set top box channel filtering and carrier recovery circuit

A carrier recovery and set-top box technology, applied in the direction of carrier adjustment, modulation carrier system, electrical components, etc., can solve the problems of unavailable, large frequency loop frequency deviation, narrow bandwidth, etc.

Pending Publication Date: 2018-04-06
天津赛特凯特科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a set-top box channel filtering and carrier recovery circuit to solve the problem in the above-mentioned background technology that the existing technology has a large frequency deviation introduced by the frequency loop and cannot provide a narrower broadband

Method used

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  • Set top box channel filtering and carrier recovery circuit

Examples

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Embodiment

[0017] This embodiment: as figure 1 As shown, a set-top box channel filtering and carrier recovery circuit includes a tuner 1 composed of a first local oscillator and a second local oscillator, and the output of the tuner 1 is connected to an intermediate frequency filter amplifier circuit 2, and the intermediate frequency filter amplifier circuit 2 Output in the locked loop, the locked loop output is connected to the frequency phase detection circuit 7, the frequency phase detection circuit 7 is fed back to the control terminal of the tuner 1, and the locked loop output is connected to the I signal terminal and the Q signal respectively end.

[0018] Since the output of the tuner is connected to the intermediate frequency filter amplifier circuit, the output of the intermediate frequency filter amplifier circuit is in the locked loop, and the output of the locked loop is connected to the frequency phase detection circuit, and the frequency phase detection circuit is fed back ...

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PUM

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Abstract

The invention belongs to the technical field of set top box field intensity measurement, and particularly relates to a set top box channel filtering and carrier recovery circuit. The output of a tuneris connected to an intermediate frequency filter amplifier circuit; the intermediate frequency filter amplifier circuit is output to a locking loop; the output of the locking loop is connected to a frequency phase detection circuit; and the frequency phase detection circuit is fed back to the control end of the tuner. The set top box channel filtering and carrier recovery circuit solves the problems that the frequency introduction deviation of a frequency loop is larger and a narrow broadband cannot be provided in the prior art, and has the beneficial effects that the phase locking loop is provided and the narrow broadband is also provided, a bidirectional standard phase-locked loop is formed, an original baseband MPEG-2 is formed, and the carrier medium frequency output of the tuner is sent to a signal demodulator.

Description

technical field [0001] The invention belongs to the technical field of set-top box field strength measurement, and in particular relates to a set-top box channel filtering and carrier recovery circuit. Background technique [0002] At present, the set-top box refers to the box on the top of the TV. It is a kind of household appliance that expands the functions of the TV. The set-top box is divided into analog set-top boxes and digital set-top boxes according to the types of signals received. The analog set-top boxes receive analog signals, and the digital set-top boxes receive digital signals. Digital set-top boxes are A multimedia terminal has a hardware architecture similar to that of a home computer and a dedicated real-time operating system. The existing technology has the problem that the frequency loop introduces a large frequency deviation and cannot provide narrower bandwidth. Contents of the invention [0003] The present invention provides a set-top box channel f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L7/033
CPCH04L7/033H04L27/0014H04L2027/0053H04L2027/0067H04L2027/0065
Inventor 郑雅轩
Owner 天津赛特凯特科技发展有限公司
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