The present invention provides a stereophonic signal processing circuit that maintains the noise level of an output signal to a lower level. Broadband adjacent interference detection signal of the desired station wide band signal and the desired signal level signal station and narrower band narrowband signal level signal is compared with the signal level, regardless of whether the provisions of wideband signal, narrow band signal in the signal level for the following provisions under the condition of judgment for the adjacent interference. A variable amplifier (36) in the narrow band signal signal level is below the prescribed circumstances of mono treatment make the L-R signal attenuation. Thus, in the condition of interference, will use the L-R signal attenuation unit began to narrow band signal attenuation signal level changes to a higher value.
【技术实现步骤摘要】
【技术保护点】
１．一种立体声信号处理电路，从输入信号中解调出Ｌ＋Ｒ信号和Ｌ－Ｒ信号，对这些信号进行加法运算以及减法运算来得到Ｌ信号和Ｒ信号，该立体声信号处理电路的特征在于，包括：相邻干扰检测单元，其将期望站信号的较宽频带的宽频带信号的信号电平与期望站信号的较窄频带的窄频带信号的信号电平进行比较，在尽管宽频带信号的信号电平为规定值以上但是窄频带信号的信号电平为规定值以下的情况下，判断为存在相邻干扰；以及衰减单元，其在窄频带信号的信号电平为规定值以下的情况下，进行使Ｌ－Ｒ信号衰减的单声道处理，其中，在判断为存在相邻干扰的情况下，将上述衰减单元开始使Ｌ－Ｒ信号衰减时的窄频带信号的信号电平变更为较高的值。
【技术特征摘要】
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【专利技术属性】
技术研发人员：黑川和成，稻叶晋也，
申请(专利权)人：安森美半导体贸易公司，
类型：发明
国别省市：BM
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