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Cable modem and gain adjustment method thereof

A modem and gain adjustment technology, which is applied in the field of network communication, can solve the problems of level range limitation, cable modem cannot adjust the gain control level, etc., and achieve the effect of expanding the level range

Inactive Publication Date: 2008-06-18
SHENZHEN COSHIP ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a cable modem and its gain adjustment method, aiming to solve the problem that the existing cable modem cannot adjust the gain control level and the acceptable level range is limited

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  • Cable modem and gain adjustment method thereof
  • Cable modem and gain adjustment method thereof
  • Cable modem and gain adjustment method thereof

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] The gain adjustment method of the cable modem in the embodiment of the present invention automatically adjusts the gain of the cable modem according to the strength of the current signal, and expands the range of levels that the cable modem can receive.

[0021] figure 1 The implementation flow of the cable modem gain adjustment method provided by the embodiment of the present invention is shown, and the details are as follows:

[0022] Step S101: Determine whether the current signal is a weak signal.

[0023] The main chip of the cable modem includes the QAM status register. In the QAM s...

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Abstract

The invention is applicable to the field of network communication and provides a cable modem and a gain adjustment method thereof. The method includes the following steps of judging whether the current signal is a weak signal or not; reading the level value of the current frequency point when the signal is weak; and automatically adjusting the grain control grade according to the level value. The gain adjustment method for the cable modem of the embodiment of the invention judges whether the current signal is weak and when the signal is weak, the level value of the current frequency point is read and the gain adjustment grade is automatically adjusted according to the current level value, thus enlarging the acceptable level range.

Description

technical field [0001] The invention belongs to the field of network communication, in particular to a cable modem and a gain adjustment method thereof. Background technique [0002] A cable modem is a device that can perform high-speed data access through a cable TV network. It generally has two interfaces, one of which is connected to the cable TV port, and the other is connected to the computer. The cable modem receives and sends data in two different directions, and modulates the uplink and downlink digital signals with different modulation methods on a certain 6MHz or 8MHz bandwidth TV channel for bidirectional transmission. [0003] A cable modem consists of a main chip and a tuner. In the prior art, a cable modem performs frequency locking on a radio frequency current (RF) signal by using a default control level reception level of a variable gain amplifier (Variable Gain Amplifie, VGA) in the tuner. That is, the default control level of the VGA interface in the tune...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/04H04L27/00
Inventor 龙庆刘代民
Owner SHENZHEN COSHIP ELECTRONICS CO LTD
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