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    • 7. 发明专利
    • Masking device
    • 屏蔽设备
    • JP2004212849A
    • 2004-07-29
    • JP2003001898
    • 2003-01-08
    • Fuji Photo Film Co Ltd富士写真フイルム株式会社
    • SUZUKI MASATOSHI
    • H04N5/93G10K11/178G11B20/24
    • G10K11/175H04K3/42H04K3/43H04K3/825H04K2203/12
    • PROBLEM TO BE SOLVED: To make it difficult to recognize an unnecessary signal included in an audio signal by a device with a simple configuration. SOLUTION: An additional signal stored in a signal storage device 4 is always added to an audio signal obtained by a sound collecting device 1. In the signal storage device, a plurality of additional signals are stored and under control based upon settings by a control circuit 8, an additional signal to be added to the audio signal can be selected. The additional signal is preferably a signal having a 200 to 4 kHz center frequency or a white noise signal which is a signal whose sound pressure level is within a given range. COPYRIGHT: (C)2004,JPO&NCIPI
    • 要解决的问题:使得通过简单配置的设备难以识别包括在音频信号中的不必要的信号。 解决方案:存储在信号存储装置4中的附加信号总是添加到由声音采集装置1获得的音频信号中。在信号存储装置中,多个附加信号基于根据 控制电路8可以选择要添加到音频信号的附加信号。 附加信号优选地是具有200至4kHz中心频率的信号或作为声压级在给定范围内的信号的白噪声信号。 版权所有(C)2004,JPO&NCIPI
    • 9. 发明专利
    • Jamming signal generator for catv system
    • 用于CATV系统的JAMMING SIGNAL GENERATOR
    • JPS5961384A
    • 1984-04-07
    • JP17245182
    • 1982-09-30
    • Nec Home Electronics Ltd
    • TAKESHITA MASARUISHIZAKA HAJIMEYAMAMOTO KIICHI
    • H04N7/16
    • H04K3/825H04K3/42H04K2203/14H04N7/166
    • PURPOSE:To obtain simply a required jamming signal, by providing a comb signal generating circuit and a programmable notch filter to each subscriber. CONSTITUTION:A CATV system 1 has a controller 4 generating a signal giving the permission of receiving of a reserved program only to a subscriber from a signal transmitted from a broadcast center 3 on a trunk cable 2, and a jamming signal generator 5 disturbing the receiving with a jamming signal as to a channel not permitted for the receiving with the receiving permission signal from the controller 4. The jamming signal generator 5 consists of a reference signal oscillating circuit 17, the comb signal generating circuit 18, a high pass filter 19 and the programmable notch filter circuit 20.
    • 目的:通过向每个用户提供梳状信号发生电路和可编程陷波滤波器,以获得简单的所需干扰信号。 构成:CATV系统1具有控制器4,该控制器4产生一个信号,该信号仅允许从中继电缆2上的广播中心3发送的信号向订户接收预约节目,以及干扰接收的干扰信号发生器5 具有与来自控制器4的接收许可信号不允许接收的信道的干扰信号。干扰信号发生器5由参考信号振荡电路17,梳状信号发生电路18,高通滤波器19和 可编程陷波滤波器电路20。