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    • 1. 发明授权
    • Pulse width modulated signal amplifier
    • 脉宽调制信号放大器
    • US4134076A
    • 1979-01-09
    • US857176
    • 1977-12-02
    • Tadao SuzukiTakeshi Fukami
    • Tadao SuzukiTakeshi Fukami
    • H03F3/20H03F3/217H03F3/38H03F3/183
    • H03F3/2171H03F3/217H03F2200/511
    • A pulse width modulated signal amplifier includes an integrator having a positive or non-inverted input terminal supplied with a modulating signal, such as, an audio signal, and an inverted input terminal supplied with a rectangular wave signal as a carrier, a high gain amplifier receiving the output of the integrator and producing a pulse width modulated signal, a pulse power amplifier receiving the pulse width modulated signal, a low pass filter receiving the output of the pulse power amplifier and producing an amplified demodulated signal corresponding to the original modulating signal and which is supplied to an output terminal, and a negative feedback circuit connected between the output terminal of the pulse power amplifier and the inverted input terminal of the integrator.
    • 脉宽调制信号放大器包括积分器,该积分器具有被提供有诸如音频信号的调制信号的正或非反相输入端,以及提供有矩形波信号作为载波的反相输入端,高增益放大器 接收积分器的输出并产生脉冲宽度调制信号,接收脉宽调制信号的脉冲功率放大器,接收脉冲功率放大器输出的低通滤波器,并产生对应于原始调制信号的放大解调信号;以及 连接在脉冲功率放大器的输出端和积分器的反相输入端之间的负反馈电路。
    • 3. 发明授权
    • Scrambling system for audio frequency signals
    • 音频信号加扰系统
    • US4600941A
    • 1986-07-15
    • US560957
    • 1983-12-13
    • Akira SakamotoToshihiko WakuTakeshi FukamiMasakatsu ToyoshimaMichimasa Komatsubara
    • Akira SakamotoToshihiko WakuTakeshi FukamiMasakatsu ToyoshimaMichimasa Komatsubara
    • H04K1/06H04N7/167
    • H04K1/06
    • A scrambling system for an audio frequency signal in which an audio signal is divided into blocks, each block being formed of a plurality of frames, the plurality of frames are rearranged on a timebase in a predetermined order at every block so as to be encoded and the encoded signal is re-arranged on the timebase in an original order so as to be decoded, in which there are provided a first signal processing circuit for inserting a redundant portion into a portion between adjoining frames and timebase-compressing the frames in response to the redundant portions upon encoding, a control signal generating circuit for inserting a control signal other than an audio information into the redundant portions, a control signal detecting circuit for detecting the control signal upon decoding and a second signal processing circuit for removing the redundant portions in synchronism with the detected control signal and timebase-expanding the frames in response to the redundant portions. Therefore, even when the audio signal is transmitted through a system in a transmission path having a timebase fluctuation such as a transmission path of a VTR (video tape recorder) and the like the frequency band region of which is restricted, the signal waveform is not distorted and a noise is not mixed therein so that the scrambling communication having high quality and high reliability can be presented.
    • 一种用于音频信号的音频信号的加扰系统,其中音频信号被分成多个块,每个块由多个帧形成,所述多个帧在每个块上以预定顺序在时基上重新排列,以被编码; 编码信号以原始顺序重新排列在时基上以被解码,其中提供了第一信号处理电路,用于将冗余部分插入相邻帧之间的部分,并响应于时基而压缩帧 编码后的冗余部分,用于将除音频信息之外的控制信号插入到冗余部分中的控制信号生成电路,用于在解码时检测控制信号的控制信号检测电路和用于去除冗余部分中的冗余部分的第二信号处理电路 与检测到的控制信号同步并响应于冗余部分对时基进行扩展。 因此,即使音频信号通过具有时频波动的传输路径的系统发送,例如VTR(录像机)的传输路径等,其频带区域被限制,信号波形也不会 失真并且不混合噪声,从而可以呈现具有高质量和高可靠性的扰频通信。
    • 9. 发明授权
    • Error correction processing apparatus
    • 纠错处理装置
    • US5031181A
    • 1991-07-09
    • US386787
    • 1989-07-27
    • Yoichiro SakoShigeru ImuraTakeshi Fukami
    • Yoichiro SakoShigeru ImuraTakeshi Fukami
    • H03M13/00H03M13/15
    • H03M13/15
    • An error correcting apparatus including a circuit for detecting error correcting modes of incoming digital information, a generator for generating a first set of syndromes for a first error correcting mode when the incoming digital information is detected as the first error correcting mode, a generator for generating a second set of syndromes for a second error correcting mode when the incoming digital information is detected as the second error correcting mode, a generator for generating quasi-syndromes for the second error correcting mode by adding an additional syndrome to the syndromes for the first error correcting mode when the incoming digital information is detected as the first error correcting mode, and an error correction circuit for applying an error correcting process to the incoming digital information based on the generated syndromes for the second error correcting mode in spite of the error correcting modes of the incoming digital information.
    • 一种误差校正装置,包括用于检测输入数字信息的误差校正模式的电路,当检测到输入数字信息作为第一纠错模式时,产生用于第一纠错模式的第一组校正子的发生器, 当输入的数字信息被检测为第二纠错模式时,用于第二纠错模式的第二组综合征;生成器,用于通过向第一错误的校正子添加附加的综合征来产生用于第二纠错模式的准综合征 检测输入数字信息作为第一纠错模式时的校正模式;以及纠错电路,用于基于所生成的第二纠错模式的校正子,对输入的数字信息进行纠错处理,尽管存在纠错模式 的传入数字信息。