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FM tuner

一种调谐器、多路径的技术，应用在广播接收电路、电气元件、传输系统等方向，能够解决分离度降低等问题，达到小型且简单电路结构的效果

Inactive Publication Date: 2009-02-04
SANYO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to reduce the influence of multipath noise in the (L-R) signal, the separation degree is also reduced in the case of multipath interference

Method used

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  • FM tuner
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Examples

Experimental program
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Embodiment Construction

[0026] Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of an FM tuner according to the embodiment. The present FM tuner 50 is formed on a common circuit board while realizing the IC conversion of its main part, and is basically constituted as a whole tuner module.

[0027] The module is installed in, for example, the car's car audio device as a part of the car's car audio device. In the FM tuner 50, a signal processing system is utilized to process the RF signal S received through the antenna 54 RF , generating an output signal S corresponding to the sound signal of the desired station OUT , wherein the signal processing system is configured to include an FM-RF tuning amplifier circuit 56, a first local oscillator 58, a first mixing circuit 60, band pass filters (Band Pass Filter: BPF) 62, 66, a buffer amplifier 64 , 72, second local oscillator 68, secon...

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PUM

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Abstract

An FM tuner that has a multipath reception detection unit and an adjacent-channel interference detection unit while reducing expansion of the scale of the circuit is available. A control signal for a stereo separation level is generated on the basis of a signal SM-DC corresponding to a reception field strength and of a signal SMP corresponding to a multipath noise component. The SMP is extracted from a fluctuation component signal SM-AC from an S-meter circuit 92 by a multipath noise extraction circuit 104. The multipath noise extraction circuit 104 used for control of the stereo separation level is shared as a portion of the circuitry for detecting the multipath signal reception state. A multipath reception detection unit 108 compares the SMP with a threshold value to detect a multipath reception state.

Description

technical field [0001] The present invention relates to an FM tuner for receiving a frequency modulation (FM) signal. Background technique [0002] In a multipath reception state (multipath interference state) in which direct waves from radio broadcasting stations and reflected waves caused by buildings etc. on the transmission path are received, the quality of the sound output reproduced by the FM tuner deteriorates. In addition, since the frequency of the carrier wave of the FM signal is changed according to an audio signal or the like, a wider frequency band is required for its transmission than, for example, an AM signal. Therefore, in the FM tuner, in the case of receiving the target transmission signal, it is easy to receive interference (adjacent interference) from other signals that transmit at a frequency close to the frequency, which may affect the sound signal to be detected. bad influence on the quality. In addition, such multipath interference and adjacent int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/16H04H40/45
CPCH04B1/1661H04B1/109H04B2001/1045H04B1/1081H04B1/1027
Inventor 小林启二
Owner SANYO ELECTRIC CO LTD
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