Receiver apparatus and method of processing received signal which attain optimum SNR

Active Publication Date: 2006-09-21
FUJITSU SEMICON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0025] According to at least one embodiment of the present invention, the intermediate frequency of the intermediate frequency signal is adjusted in response to at least one of the signal speed and channel frequency interval of the received signal, thereby attaining a desired intermediate frequency, which optimizes the SNR after A/D conversion. In so doing, the intermediate frequency signal is A/D-converted into a digital signal, which is then subjected to digital filtering such that its frequency band is limited to the frequency band of

Problems solved by technology

Accordingly, how to prevent the degradation of the SNR becomes a main issue when implementing a high-quality information transmission system.
In order to change the sampling frequency, there is a need to provide a special circuit configuration

Method used

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Example

[0041] In the following, embodiments of the present invention will be described with reference to the accompanying drawings.

[0042]FIG. 2 is a block diagrams showing an example of the configuration of a CATV receiver apparatus according to the present invention. Although the configuration of FIG. 2 is suitable for use as a CATV receiver apparatus, for example, the present invention is not limited to a CATV system and applicable to receiver apparatus in general.

[0043] The CATV receiver apparatus of FIG. 2 includes a tuner unit 40, a demodulation unit 50, and a controller 60. The tuner unit 40 includes a band-pass filter 41, a first amplifier 42, a band-pass filter 43, a second amplifier 44, a mixer 45, a third amplifier 46, and a VCO 47. The demodulation unit 50 includes an A / D converter 51 and a digital-filter-&-demodulator 52.

[0044] The band-pass filter 41 passes only a range of effective CATV channels among the frequency components of the received signal. Namely, the band-pass fi

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Abstract

A receiver apparatus includes a band-pass filter having a variable frequency band coupled to a node for receiving a received signal including a plurality of channels to output at an output node thereof a limited-band signal made by limiting a frequency band of the received signal to a frequency band of a desired channel, a frequency conversion unit coupled to the output node of the band-pass filter to output at an output node thereof an intermediate frequency signal made by converting frequencies of the limited-band signal, and a control unit configured to adjust an intermediate frequency of the intermediate frequency signal by controlling the frequency conversion unit in response to at least one of a signal speed and a channel frequency interval of the received signal.

Description

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Claims

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Application Information

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Owner FUJITSU SEMICON LTD
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