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

A technology for receiving signals and receivers, which is applied in the field of processing received signals, can solve the problems that CATV receiver devices cannot achieve the best SNR, etc., and achieves the effects of simple design and cost reduction.

Inactive Publication Date: 2006-09-20
FUJITSU MICROELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Therefore, the configuration of the CATV receiver device of the related art shown in FIG. 1 has a problem that the optimum SNR cannot be achieved.

Method used

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  • Receiver apparatus and method of processing received signal which attain optimum snr
  • Receiver apparatus and method of processing received signal which attain optimum snr
  • Receiver apparatus and method of processing received signal which attain optimum snr

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Embodiment Construction

[0038] Embodiments of the present invention will be described below with reference to the drawings.

[0039] FIG. 2 shows an example of the configuration of a CATV receiver device according to the present invention. Although, for example, the configuration in FIG. 2 is suitable for use as a CATV receiver device, the present invention is not limited to a CATV system and can be applied to general receiver devices.

[0040] The CATV receiver device of FIG. 2 includes a tuner unit 40 , a demodulation unit 50 and a controller 60 . The tuner unit 40 includes a bandpass filter 41 , a first amplifier 42 , a bandpass 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 and demodulator 52 .

[0041]The bandpass filter 41 allows only the range of valid CATV channels to pass in the frequency components of the received signal. That is, the band-pass filter 41 allows frequency compo...

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Abstract

The present invention provides a receiver device comprising a band-pass filter having a variable frequency band and coupled to a receiver for receiving a received signal comprising a plurality of channels, a frequency conversion unit, and a control unit. node, the band-pass filter outputs at its output node a band-limited signal obtained by limiting the frequency band of the received signal to the frequency band of the useful channel, the frequency conversion unit is coupled to the output node of the band-pass filter, and The output node thereof outputs an intermediate frequency signal obtained by converting the frequency of the band-limited signal, and the control unit is configured to control the frequency conversion unit in response to at least one of a signal rate of the received signal and a channel frequency spacing, thereby Adjusts the center frequency of the mid-frequency signal.

Description

technical field [0001] The present invention relates generally to a receiver apparatus and a method of processing a received signal, and more particularly to a receiver apparatus and a method of processing a received signal for a received signal comprising a plurality of channels. Background technique [0002] In recent years, in order to provide digital information with higher quality, the amount of digital information being transmitted and received has been increasing. As a method of efficiently transmitting a large amount of information, a QAM (Quadrature Amplitude Modulation) method of transmitting information by using amplitude modulation and phase modulation is widely known. [0003] For digital satellite broadcasting and the like, QPSK (Quadrature Phase Shift Keying), which transmits and receives data of 4 values ​​(2 bits) per modulation by assigning four different phases to respective different values, is currently commonly used. In CATV systems with less interfere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38H04B1/16H04N5/44H04N7/10
CPCH04B1/1036
Inventor 菅田章彦
Owner FUJITSU MICROELECTRONICS LTD
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