发明授权
- 专利标题： Noise reduction system having series connected low and high frequency emphasis and de-emphasis filters
- 专利标题（中）： 降噪系统具有串联连接的低和高频强调和去加重滤波器
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申请号： US256825申请日： 1981-04-23
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公开(公告)号： US4363007A公开(公告)日： 1982-12-07
- 发明人: Yutaka Haramoto , Yukinobu Ishigaki , Kaoru Totsuka , Takao Kawasaki
- 申请人： Yutaka Haramoto , Yukinobu Ishigaki , Kaoru Totsuka , Takao Kawasaki
- 申请人地址： JPX Yokohama
- 专利权人： Victor Company of Japan, Limited
- 当前专利权人： Victor Company of Japan, Limited
- 当前专利权人地址： JPX Yokohama
- 优先权： JPX55-54657 19800424
- 主分类号： H04B1/62
- IPC分类号： H04B1/62 ; G11B20/04 ; G11B20/24 ; H03G9/02 ; H04B1/64
摘要：
In a noise reduction system including a compressor and an expander having a complementary frequency response characteristic to the frequency response characteristic of the compressor, the compressor includes a high frequency emphasis variable frequency filter and a low frequency emphasis variable gain filter which are connected in a series circuit between input and output terminals and which respectively vary their parameters in response to the respective high and low frequency components of the compressor output. The expander includes a high frequency de-emphasis variable frequency filter and a low frequency de-emphasis variable gain filter which are connected in a series circuit between input and output terminals and which respectively vary their parameters in response to the respective high and low frequency components of the expander input.
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