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    • 11. 发明授权
    • Circuit arrangement for deriving signals for masking audio signals
    • 用于导出用于屏蔽音频信号的信号的电路布置
    • US5661810A
    • 1997-08-26
    • US522314
    • 1995-08-25
    • Djahanyar ChahabadiMatthias HerrmannLothar VogtJurgen Kaesser
    • Djahanyar ChahabadiMatthias HerrmannLothar VogtJurgen Kaesser
    • H03H17/04H03H17/02H04B1/10H04B1/16H04B1/26H04B1/64H04H1/00H04H20/57H04H40/63H04H40/72H04H5/00
    • H04H40/63H04H40/72H04H20/57
    • The circuit arrangement includes a first low-pass filter (2) for filtering an input signal (H3) proportional to the strength of a received radio signal; a second low-pass filter (3) for filtering the input signal (H3); a first weighting circuit (7) for weighting the first low-pass filter output signal with first coefficients to form a first weighted output signal; a circuit device for forming a masking signal for reducing stereo channel isolation from the first weighted output signal; a second weighting circuit (5) for forming a second weighted output signal weighted with second coefficients from the first low-pass filter output signal or the second low-pass filter output signal according to a switching signal (DD2) indicative of interference in the audio signals; a switch device (4) for selecting the first low-pass filter output signal for weighting in the second weighting circuit means (5) when no interference is indicated by the switching signal (DD2) and the second low-pass filter output signal for weighting in the second weighting circuit means (5) when interference is indicated by the switching signal (DD2); and a circuit device for forming a masking signal for damping the audio signal from the second weighted output signal.
    • PCT No.PCT / DE94 / 00321 Sec。 371日期1995年8月25日 102(e)日期1995年8月25日PCT 1994年3月22日PCT公布。 公开号WO94 / 22229 日期1995年9月29日该电路装置包括:第一低通滤波器(2),用于对与接收的无线电信号的强度成正比的输入信号(H3)进行滤波; 用于对输入信号(H3)进行滤波的第二低通滤波器(3); 第一加权电路(7),用于利用第一系数对第一低通滤波器输出信号进行加权,以形成第一加权输出信号; 电路装置,用于形成用于减少立体声信道隔离的屏蔽信号与第一加权输出信号; 第二加权电路(5),用于根据指示音频中的干扰的切换信号(DD2),从第一低通滤波器输出信号或第二低通滤波器输出信号形成用第二系数加权的第二加权输出信号 信号; 开关装置(4),用于当没有由开关信号(DD2)指示干扰和用于加权的第二低通滤波器输出信号时,在第二加权电路装置(5)中选择用于加权的第一低通滤波器输出信号 在第二加权电路装置(5)中,当由切换信号(DD2)指示干扰时; 以及电路装置,用于形成用于阻尼来自第二加权输出信号的音频信号的屏蔽信号。