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Audio-signal-processing circuit

A technology of sound signal processing and sound signal, which is applied in the field of sound signal processing circuit, can solve problems such as deterioration of sound quality, and achieve the effect of removing noise

Inactive Publication Date: 2013-03-06
SEMICON COMPONENTS IND LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, in the radio 300, although the influence of multipath noise and the like is suppressed, the sound quality deteriorates when the switch 420 is switched.

Method used

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Embodiment Construction

[0037] From the description of this specification and the drawings, at least the following matters will become clear.

[0038] figure 1 It is a figure which shows the structure of the radio 10 which concerns on one Embodiment of this invention. The radio 10 is installed in, for example, a car audio (not shown), and includes an antenna 20 , a tuner 21 , and a system LSI (Large Scale Integration) 22 .

[0039] The tuner 21 extracts, for example, a broadcast signal of a designated receiving station from an FM (Frequency Modulation) multiplexed broadcast signal received via the antenna 20, converts it into an IF signal, and outputs it.

[0040] The system LSI 22 is configured including an AD converter (ADC) 40 , a digital signal processing circuit (DSP) 41 , and a DA converter (DAC) 42 .

[0041] ADC40 converts the IF signal output from the tuner 21 into a digital signal, and outputs it to DSP41. In the DSP 41 (audio signal processing circuit), an audio signal is generated, an...

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Abstract

The invention provides an audio signal processing circuit which can eliminate audio signal noise and outputs audio signal with good audio quality. The audio-signal-processing circuit includes: a noise-detecting unit to detect presence or absence of noise in an audio signal generated based on an output from a tuner configured to receive a broadcast signal; a low-pass filter, having predetermined phase characteristics, to pass the audio signal having a band of frequencies lower than a predetermined frequency; a high-pass filter, having the predetermined phase characteristics, to pass the audio signal having a band of frequencies higher than the predetermined frequency; first- and second-output units to multiply the signals outputted from the low-pass and high-pass filters by first and second coefficients and output the multiplied signals, respectively; an adding unit to add the signals respectively outputted from the first and the second output units; and a coefficient control unit to, when the noise-detecting unit has detected the presence of noise, decrease the second coefficient below the first coefficient.

Description

technical field [0001] The invention relates to a sound signal processing circuit. Background technique [0002] In general radio receivers, audio signal processing differs depending on the presence or absence of noise (for example, multipath noise or adjacent channel noise) on the audio signal (see, for example, Patent Document 1). [0003] Figure 10 It is a diagram showing an example of the FM radio 300 . The broadcast signal received by the antenna 310 is converted into an intermediate frequency signal (IF signal) by the tuner 320 . The IF processing unit 400 of the system LSI 330 performs demodulation processing on the IF signal to generate an audio signal. The low-pass filter (LPF) 410 passes the low-frequency components of the audio signal to remove noise from the audio signal. The noise detection unit 450 detects the presence or absence of noise to the audio signal from the IF signal. The control unit 460 controls the selector switch 420 based on the detection re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10G10L21/0208
CPCH03G3/32H04B1/0007H03G5/005H04B1/10H03G5/165H04B1/1036H04B1/16
Inventor 川野圣史
Owner SEMICON COMPONENTS IND LLC
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