公开(公告)号：US4517602A

公开(公告)日：1985-05-14

申请号：US434935

申请日：1982-10-18

申请人： Wesley W. Murphy, III ,  James Hettiger

发明人： Wesley W. Murphy, III ,  James Hettiger

IPC分类号： H03H11/04 ,  H04N5/60

CPC分类号： H04N5/607

摘要： A dynamic noise filter especially adapted for use in audio reproduction systems within a television display device is provided to eliminate perceived noise. An audio signal having a relatively wide frequency range is passed through a variable bandwidth lowpass filter, the upper frequency cutoff point being variable in response to a control signal. A control path includes a filter and detector circuit for generating the control signal in response to the amplitude of the audio signal within an upper frequency portion of the audio signal frequency range. The control signal controls the bandwidth of the lowpass filter inversely with respect to the level of the audio signal within the upper frequency portion of the frequency range. A further filter is included in the control path for providing substantial attenuation at the fundamental frequency and lower order harmonic frequencies of the television horizontal line scanning signal in order to prevent the control path from erroneously responding to this signal.

摘要翻译： 特别适用于电视显示装置中的音频再现系统的动态噪声滤波器被提供以消除感知到的噪声。 具有相对宽的频率范围的音频信号通过可变带宽低通滤波器，上限频率截止点响应于控制信号而变化。 控制路径包括滤波器和检测器电路，用于响应于音频信号频率范围的高频部分内的音频信号的幅度产生控制信号。 控制信号相对于频率范围的较高频率部分内的音频信号的电平反向控制低通滤波器的带宽。 在控制路径中包括另外的滤波器，用于在电视水平行扫描信号的基频和低阶谐波频率处提供实质衰减，以防止控制路径错误地响应于该信号。

公开(公告)号：US4536787A

公开(公告)日：1985-08-20

申请号：US489302

申请日：1983-04-28

申请人： Wesley W. Murphy, III ,  Saiprasad V. Naimpally

发明人： Wesley W. Murphy, III ,  Saiprasad V. Naimpally

IPC分类号： H04N9/64 ,  H04N9/535

CPC分类号： H04N9/64

摘要： A filter network suitable for processing a signal such as the demodulated "I" chrominance component of a composite color television signal is disclosed. The filter network comprises plural cascaded mutually interactive resonant LC sections for providing wideband filtering, amplitude peaking over a prescribed range of signal frequencies, and signal delay. Mismatched resistors terminate the filter network and constitute the primary DC impedance of the filter network, and the LC sections exhibit selected impedances at frequencies within the peaking frequency range.

摘要翻译： 公开了一种适用于处理诸如复合彩色电视信号的解调“I”色度分量之类的信号的滤波器网络。 滤波器网络包括多个级联的相互交互的谐振LC部分，用于提供宽带滤波，在规定的信号频率范围内的幅度峰化以及信号延迟。 不匹配的电阻器终止滤波器网络并构成滤波器网络的主要直流阻抗，LC部分在峰值频率范围内的频率处呈现选定的阻抗。

公开(公告)号：US4620220A

公开(公告)日：1986-10-28

申请号：US508593

申请日：1983-06-28

申请人： Saiprasad V. Naimpally ,  Wesley W. Murphy, III

发明人： Saiprasad V. Naimpally ,  Wesley W. Murphy, III

IPC分类号： H04N9/64 ,  H04N9/77

CPC分类号： H04N9/646

摘要： A color television receiver includes a comb filter responsive to detected video signals for providing a wideband combed chrominance signal, which is coupled to chrominance processing circuits via a composite filter including plural mutually interactive resonant sections. An input resonant section of the filter serves to remove very high frequency interference signals including comb filter switching components from the chrominance signal path, and also coacts with the other filter sections to provide an amplitude characteristic having a sense to compensate for an oppositely directed amplitude characteristic associated with the detected video signals, over the passband of the wideband chrominance signals.

摘要翻译： 彩色电视接收机包括响应于检测到的视频信号的梳状滤波器，用于提供宽带梳状色度信号，该梳状滤波器经由包括多个相互交互的共振部分的复合滤波器耦合到色度处理电路。 滤波器的输入谐振部分用于从色度信号路径去除包括梳状滤波器开关元件的非常高频的干扰信号，并且与其它滤波器部分共同作用以提供具有补偿相反定向振幅特性的振幅特性 与所检测的视频信号相关联，在宽带色度信号的通带上。