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1. 发明公开

EP0430469A3 A signal quality detecting circuit for FM receivers 失效
标题翻译： FM接收机的信号质量检测电路
公开(公告)号：EP0430469A3
公开(公告)日：1992-05-27
申请号：EP90312233.1
申请日：1990-11-08
申请人： FORD MOTOR COMPANY LIMITED , FORD-WERKE AKTIENGESELLSCHAFT , FORD FRANCE S. A.
发明人： Kennedy, John Francis , Kuo, Yao Hsien
IPC分类号： H04B1/16 , H03J7/22
CPC分类号： H04B1/1027 , H04B1/1661
摘要： A signal quality detecting circuit for an FM receiver, said receiver including an IF detector generating an intensity signal indicating the received field strength of the FM signal being received and including an FM demodulator generating an automatic frequency control signal indicating a frequency error at which said FM signal is being received, said signal quality detecting circuit comprising, level detector means (32) adapted to be coupled to said IF detector for producing a first signal when said intensity signal is greater than a predetermined intensity, window detector means (33) adapted to be coupled to said FM demodulator for producing a second signal when said automatic frequency control signal is within a predetermined window, noise filter means (31) adapted to be coupled to said IF detector for generating a filtered noise signal derived from said intensity signal, said filter means rejecting frequencies containing components related to the intelligence contained in said FM signal, peak detector means (31) coupled to said noise filter means for producing a third signal when said filtered noise signal is below a predetermined peak value, and logic means coupled to said level detector means, said window detector means, and said peak detector means for producing an indicating signal (35) in response to the simultaneous occurrence of said first, second, and third signals to indicate that a high quality FM signal is being received.

2. 发明授权

EP0430469B1 A signal quality detecting circuit for FM receivers 失效
标题翻译：电路的信号质量确定为FM接收器。
公开(公告)号：EP0430469B1
公开(公告)日：1995-10-18
申请号：EP90312233.1
申请日：1990-11-08
申请人： FORD MOTOR COMPANY LIMITED , FORD-WERKE AKTIENGESELLSCHAFT , FORD FRANCE S. A.
发明人： Kennedy, John Francis , Kuo, Yao Hsien
IPC分类号： H04B1/16 , H03J7/22
CPC分类号： H04B1/1027 , H04B1/1661

3. 发明公开

EP0430469A2 A signal quality detecting circuit for FM receivers 失效
标题翻译： Schallung zurSignalqualitätsbestimmungfürFM-Empfänger。
公开(公告)号：EP0430469A2
公开(公告)日：1991-06-05
申请号：EP90312233.1
申请日：1990-11-08
申请人： FORD MOTOR COMPANY LIMITED , FORD-WERKE AKTIENGESELLSCHAFT , FORD FRANCE S. A.
发明人： Kennedy, John Francis , Kuo, Yao Hsien
IPC分类号： H04B1/16 , H03J7/22
CPC分类号： H04B1/1027 , H04B1/1661
摘要： A signal quality detecting circuit for an FM receiver, said receiver including an IF detector generating an intensity signal indicating the received field strength of the FM signal being received and including an FM demodulator generating an automatic frequency control signal indicating a frequency error at which said FM signal is being received, said signal quality detecting circuit comprising, level detector means (32) adapted to be coupled to said IF detector for producing a first signal when said intensity signal is greater than a predetermined intensity, window detector means (33) adapted to be coupled to said FM demodulator for producing a second signal when said automatic frequency control signal is within a predetermined window, noise filter means (31) adapted to be coupled to said IF detector for generating a filtered noise signal derived from said intensity signal, said filter means rejecting frequencies containing components related to the intelligence contained in said FM signal, peak detector means (31) coupled to said noise filter means for producing a third signal when said filtered noise signal is below a predetermined peak value, and logic means coupled to said level detector means, said window detector means, and said peak detector means for producing an indicating signal (35) in response to the simultaneous occurrence of said first, second, and third signals to indicate that a high quality FM signal is being received.
摘要翻译：一种用于FM接收机的信号质量检测电路，所述接收机包括：IF检测器，产生指示正在接收的FM信号的接收场强的强度信号，并包括FM解调器，FM解调器产生指示频率误差的自动频率控制信号，所述信号质量检测电路包括：电平检测器装置（32），适于在所述强度信号大于预定强度时与所述IF检测器耦合以产生第一信号，窗口检测器装置（33）适于耦合到所述FM解调器，用于当所述自动频率控制信号在预定窗口内时产生第二信号，噪声滤波器装置（31）适于耦合到所述IF检测器，用于产生从所述强度信号导出的滤波噪声信号，所述噪声滤波器装置滤波器意味着拒绝包含与所述FM中包含的智能有关的组件的频率所述峰值检测器装置（31）耦合到所述噪声滤波器装置，用于当所述滤波噪声信号低于预定峰值时产生第三信号，以及耦合到所述电平检测器装置，所述窗口检测器装置和所述峰值检测器用于响应于所述第一，第二和第三信号的同时发生而产生指示信号（35）的装置，以指示正在接收高质量的FM信号。

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