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1. 发明授权

US4137430A System for recording a signal with tracing and tracking distortion compensation on a record disc 失效
标题翻译：用于在记录盘上记录具有跟踪和跟踪失真补偿的信号的系统
公开(公告)号：US4137430A
公开(公告)日：1979-01-30
申请号：US698734
申请日：1976-06-22
申请人： Teruo Muraoka , Kohji Seki
发明人： Teruo Muraoka , Kohji Seki
IPC分类号： G11B3/00 , G11B20/00 , G11B23/00
CPC分类号： G11B20/00992 , G11B23/0007
摘要： In a record disc recording system for recording a signal f(t), the cutter stylus has a cutting angle .theta. and operates responsive to a signal to be recorded on a record disc. A tracing and tracking distortion compensation circuit operates, upon being supplied with the recording signal f(t), to produce an output signal T.sub.p.sup.-1 {f(t)} as expressed by the following equation, and to supply the same as the signal to be recorded by the cutter stylus. ##EQU1## where R IS THE RADIUS OF THE TIP OF A REPRODUCING STYLUS TO BE USED FOR REPRODUCING THE RECORDED SIGNAL FROM THE DISC,V is the relative linear velocity of the reproducing stylus relative to the sound groove of the record disc, ##EQU2## The cutter operates responsive to the signal T.sub.p.sup.-1 {f(t)}. The reproducing stylus reproduces the signal thus recorded without tracing and tracking distortion.
摘要翻译：在用于记录信号f（t）的记录盘记录系统中，裁刀触针具有切割角度θ，并响应要记录在记录盘上的信号进行操作。跟踪和跟踪失真补偿电路在被提供有记录信号f（t）时工作，以产生由下面的等式表示的输出信号Tp-1 {f（t）}，并提供与信号相同的信号由切割笔记录。 + tr 其中R是用于从DISC再现记录信号的再现STYL的提示的半径，V是再现触笔相对于记录的声槽的相对线速度光盘，切割器对信号Tp-1 {f（t）}响应。再现手写笔再现如此记录的信号，而无需跟踪和跟踪失真。

2. 发明授权

US4211979A Circuit arrangement for eliminating waveform distortion of an angle-modulated signal transmitted over multipaths 失效
标题翻译：用于消除在多路径上传输的角度调制信号的波形失真的电路布置
公开(公告)号：US4211979A
公开(公告)日：1980-07-08
申请号：US919744
申请日：1978-06-28
申请人： Teruo Muraoka , Masami Yamazaki , Yukinobu Ishigaki
发明人： Teruo Muraoka , Masami Yamazaki , Yukinobu Ishigaki
IPC分类号： H03D3/00 , H04B1/10 , H04B1/12 , H04B14/00 , H04H1/00 , H04H40/72
CPC分类号： H04H40/72 , H03D3/002 , H04B1/123 , H04B14/006
摘要： An FM wave received by an antenna is fed via an AGC circuit to a first FM demodulator and to a compensation signal generator which includes an envelope signal generator, a capacitor, a function generator, an analog multiplier, an SSB modulator, and a second FM demodulator so that the output signal of the compensation signal generator is added to the output signal obtained by the first FM demodulator to offset the multipath distortion contained in the received FM wave.
摘要翻译：由天线接收的FM波通过AGC电路馈送到第一FM解调器和补偿信号发生器，该补偿信号发生器包括包络信号发生器，电容器，函数发生器，模拟乘法器，SSB调制器和第二FM 解调器，使得补偿信号发生器的输出信号被添加到由第一FM解调器获得的输出信号，以抵消包含在接收的FM波中的多路径失真。

3. 发明授权

US4163945A System for removing interference distortion in the demodulated signal of a frequency-modulated signal 失效
标题翻译：用于去除调频信号的解调信号中的干扰失真的系统
公开(公告)号：US4163945A
公开(公告)日：1979-08-07
申请号：US915212
申请日：1978-06-13
申请人： Yukinobu Ishigaki , Teruo Muraoka
发明人： Yukinobu Ishigaki , Teruo Muraoka
IPC分类号： H04B1/10 , H03D3/00 , H04B1/12 , H04B7/015
CPC分类号： H03D3/002 , H04B1/12 , H04B1/123
摘要： A system for removing interference distortion in the demodulated signal of a frequency-modulated signal comprises a demodulator for demodulating an input frequency-modulated signal Ca(t) which has been subjected to interference by another frequency-modulated signal, and thereby obtaining a demodulated signal e.sub.o (t), a first analog multiplier for obtaining a signal in which the input frequency-modulated signal is squared, a low-pass filter supplied with the squared signal and detecting an envelope of the input frequency-modulated signal in square characteristics, and thereby producing as output a squared envelope signal {Env(t)}.sup.2, a second analog multiplier supplied with the demodulated signal e.sub.o (t) from the demodulator and with the squared envelope signal {Env(t)}.sup.2 from the low-pass filter, and thereby producing as output a signal e.sub.oa (t) of the product of both signals, a DC blocking capacitor for suppressing DC component of said squared envelope signal {Env(t)}.sup.2, and thereby obtaining only AC component, a first operation circuit supplied with the product signal e.sub.oa (t), a delay circuit for delaying an output signal of the first operation circuit by a specific delay time, a second operation circuit for adding the output signal of the first operation circuit and the output signal of the second operation circuit, and a third analog multiplier for carrying out multiplication of the AC component signal {Env(t)}.sup.2 and the output signal of the second operation circuit, and thereby supplying the resulting output signal h(t) to the first operation circuit. The first operation circuit substantially carries out subtraction of the signal e.sub.oa (t) and the signal h(t). From the first operation circuit is derived the demodulated signal in which the interference distortion has been substantially cancelled and thus removed.
摘要翻译：用于去除调频信号的解调信号中的干扰失真的系统包括：解调器，用于解调经过另一个调频信号的干扰的输入调频信号Ca（t），从而获得解调信号 eo（t），用于获得输入调频信号平方的信号的第一模拟乘法器，提供有平方信号的低通滤波器，并以方波特性检测输入频率调制信号的包络;以及从而产生作为输出的平方包络信号{Env（t）} 2，从解调器提供解调信号eo（t）的第二模拟乘法器和来自低通的平方包络线信号{Env（t）} 2 滤波器，从而产生两个信号的乘积的信号eoa（t），用于抑制所述平方包络线信号{Env（t）} 2的DC分量的直流隔离电容器，从而获得o 提供产品信号eoa（t）的第一操作电路，用于将第一操作电路的输出信号延迟特定延迟时间的延迟电路，用于将第一操作的输出信号相加的第二运算电路电路和第二运算电路的输出信号;以及第三模拟乘法器，用于执行交流分量信号{Env（t）} 2和第二运算电路的输出信号的乘法，从而将所得到的输出信号h （t）到第一操作电路。第一操作电路基本上执行信号eoa（t）和信号h（t）的减法。从第一运算电路得出其中干扰失真已基本上消除并因此被去除的解调信号。

4. 发明授权

US3942126A Band-pass filter for frequency modulated signal transmission 失效
标题翻译：用于调频信号传输的带通滤波器
公开(公告)号：US3942126A
公开(公告)日：1976-03-02
申请号：US524818
申请日：1974-11-18
申请人： Teruo Muraoka
发明人： Teruo Muraoka
IPC分类号： H03H15/02 , H04B14/00 , H04B1/04
CPC分类号： H03H15/02 , H04B14/006
摘要： A band-pass filter comprises a delay circuit comprising a plurality of unit delay elements connected in cascade arrangement and receiving as input a signal including a frequency modulated signal and a coefficient summing circuit for carrying out coefficient summing of the outputs of specific delay units of the delay circuit and producing as output the frequency moudlated signal which has been band-pass filtered. This band-pass filter has a transmission characteristic representable byH(j.omega.) = [ 1 - a(.omega. - .omega..sub.o).sup.2] e .sup.-.sup.j.sup..omega..sup..tau.d ,where:a is a constant imparting an attenuation characteristic of the filter;.omega..sub.o is an angular frequency of a carrier wave of a frequency modulated signal and a center angular frequency of the band-pass filter; and.tau.d is a delay time of the band-pass filter.
摘要翻译：带通滤波器包括延迟电路，该延迟电路包括串联连接的多个单位延迟元件，作为输入接收包括频率调制信号的信号和系数求和电路，用于对所述延迟元件的特定延迟单元的输出进行系数求和延迟电路，并产生频带滤波后的频率信号。该带通滤波器具有由H（jω）= [1-a（ω-ω-o）2] e j可以表示的传输特性，其中：

5. 发明授权

US3936618A Multichannel record disc reproducing system and apparatus 失效
标题翻译：多通道记录盘再现系统和装置
公开(公告)号：US3936618A
公开(公告)日：1976-02-03
申请号：US448732
申请日：1974-03-06
申请人： Nobuaki Takahashi , Hideo Onoye , Teruo Muraoka , Masao Kasuga
发明人： Nobuaki Takahashi , Hideo Onoye , Teruo Muraoka , Masao Kasuga
IPC分类号： H04S3/00 , G11B3/00 , G11B3/74
CPC分类号： H04S3/006
摘要： A multichannel record disc reproducing system and apparatus comprises a phase-locked loop for demodulating an angle-modulated wave signal in a multiplexed signal picked up from a multichannel record disc. A synchronous detector compares the phases of the angle-modulated wave signal and an output signal of a voltage-controlled oscillator in the phase-locked loop. The detector produces an output signal when there is a noise component in the angle-modulated wave signal. A circuit, controlled by the output of the synchronous detector, provides a demodulated output signal having at least one attenuated frequency band, in which a noise component is greatly reduced.
摘要翻译：多通道记录盘再现系统和装置包括用于解调从多声道记录盘拾取的复用信号中的角度调制波信号的锁相环。同步检波器将锁相环中的角度调制波信号的相位与压控振荡器的输出信号进行比较。当角度调制波信号中存在噪声分量时，检测器产生输出信号。由同步检测器的输出控制的电路提供具有至少一个衰减频带的解调输出信号，其中噪声分量大大降低。

6. 发明授权

US4079330A System for demodulating angle-modulated signals 失效
标题翻译：用于解调角度调制信号的系统
公开(公告)号：US4079330A
公开(公告)日：1978-03-14
申请号：US746336
申请日：1976-12-01
申请人： Yukinobu Ishigaki , Kohei Sasamura , Yasuo Itoh , Teruo Muraoka
发明人： Yukinobu Ishigaki , Kohei Sasamura , Yasuo Itoh , Teruo Muraoka
IPC分类号： G11B3/00 , H03D3/00 , H03D3/02 , H03D3/06 , H03D3/24 , H03D3/26 , H04H20/89 , H04S3/00 , H03D3/22
CPC分类号： H04H20/88 , H03D3/005 , H03D3/02 , H03D3/06 , H03D3/24 , H03D3/26 , H04H20/89
摘要： The inventive system demodulates angle-modulated signals. A tracking band-pass filter responds to an input angle-modulated wave signal. The tracking filter has a pass band with a center frequency controlled by a control signal. A first amplitude limiter limits the amplitude of the input angle-modulated wave signal. A differentiation circuit establishes a 90.degree. phase difference between a signal passing through the tracking band-pass filter and a signal passing through the amplitude limiter. A phase comparator responds to an input with the two signals with a 90.degree. phase difference therebetween and produces an output error signal in accordance with this phase difference. This output error signal is supplied as the control signal to the tracking band-pass filter. This output error signal is also passed through a low pass filter to produce the demodulated signal.
摘要翻译：本发明的系统解调角度调制信号。跟踪带通滤波器响应输入角度调制波信号。跟踪滤波器具有通过控制信号控制的中心频率的通带。第一幅度限制器限制输入角度调制波信号的幅度。差分电路在通过跟踪带通滤波器的信号和通过幅度限制器的信号之间建立90°的相位差。相位比较器响应输入，其中两个信号之间的相位差为90°，并根据该相位差产生输出误差信号。该输出误差信号作为控制信号提供给跟踪带通滤波器。该输出误差信号也通过低通滤波器以产生解调信号。

7. 发明授权

US4204091A Cancellation of interference distortions caused by intermodulation between FM signals on adjacent channels 失效
标题翻译：消除由相邻信道上的FM信号之间的互调造成的干扰失真
公开(公告)号：US4204091A
公开(公告)日：1980-05-20
申请号：US887813
申请日：1978-03-17
申请人： Yukinobu Ishigaki , Teruo Muraoka
发明人： Yukinobu Ishigaki , Teruo Muraoka
IPC分类号： H04B1/16 , H04H5/00
CPC分类号： H04B1/1661
摘要： A crosstalk cancellation circuit includes a pair of input terminals to which interference affected FM signals are applied and a pair of output terminals from which distortionless demodulated signals are delivered. For each transmission channel an envelope detector is provided which is connected to the input terminal to detect the envelope of the FM signal. A closed-loop feedback circuits are cross-coupled across the output terminals to process the signals thereat with the detected envelopes to derive an offset signal for each channel, which is combined with a frequency-demodulated signal of the FM signal of each channel.
摘要翻译：串扰消除电路包括施加了干扰影响的FM信号的一对输入端子和从其传送无失真解调信号的一对输出端子。对于每个传输通道，提供包络检测器，其连接到输入端以检测FM信号的包络。闭环反馈电路跨越输出端交叉耦合，以便利用检测到的信封处理信号，以导出每个通道的偏移信号，该偏移信号与每个通道的FM信号的频率解调信号相组合。

8. 发明授权

US4045621A Recording system for a multichannel record disc 失效
标题翻译：多通道记录盘记录系统
公开(公告)号：US4045621A
公开(公告)日：1977-08-30
申请号：US610263
申请日：1975-09-04
申请人： Isao Ohwaki , Kohei Sasamura , Teruo Muraoka , Takaro Mori
发明人： Isao Ohwaki , Kohei Sasamura , Teruo Muraoka , Takaro Mori
IPC分类号： G11B3/38 , G11B20/00 , G11B3/00 , G11B3/74
CPC分类号： G11B20/00992 , G11B3/38
摘要： A multichannel record disc recording system uses two channels of direct wave sum signals and two channels of angle-modulated wave difference signals which are multiplexed and recorded in one sound groove on a record disc. During recording, a tracing distortion compensation means imparts a reverse distortion which cancels the tracing distortion produced, with respect to the sum signals, during reproducing. Since the compensation means is in the transmission paths of the direct wave sum signals, the reverse distortion is only imparted to the direct wave sum signals. Also, phase correction signals are provided.

9. 发明授权

US4198609A Phase tracked loop frequency demodulator 失效
标题翻译：相位跟踪环路频率解调器
公开(公告)号：US4198609A
公开(公告)日：1980-04-15
申请号：US924554
申请日：1978-07-14
申请人： Yukinobu Ishigaki , Teruo Muraoka , Masaki Hagihara , Takeo Nasu , Kunihiro Kato
发明人： Yukinobu Ishigaki , Teruo Muraoka , Masaki Hagihara , Takeo Nasu , Kunihiro Kato
IPC分类号： H03D3/22
CPC分类号： H03D3/22
摘要： A phase tracked loop frequency demodulator having a phase comparator receptive of a frequency modulated signal and a peak-shifting filter for imparting a constant phase shift of 90.degree. over the full range of its instantaneous frequencies in response to a feedback control signal to permit the phase comparator to compare the non-phase shifted and phase shifted signals. The carrier frequency components of the output from the comparator are eliminated by means of a second filter to derive a demodulated signal which is used as the control signal. In order to eliminate high frequency limitations of the peak-shifting filter, this filter is comprised of a variable reactance element and a complementary reactance element so connected thereto to form a resonant circuit which possesses a quadratic frequency response characteristic with a resonant peak at the upper or lower frequency end of the passband.
摘要翻译：具有接收频率调制信号的相位比较器的相位跟踪环路频率解调器和用于响应于反馈控制信号在其瞬时频率的全范围内给出90度的恒定相移的峰值移位滤波器，以允许相位比较器比较非相移和相移信号。通过第二滤波器消除来自比较器的输出的载波频率分量，以导出用作控制信号的解调信号。为了消除峰值偏移滤波器的高频限制，该滤波器由可变电抗元件和与其连接的互补电抗元件组成，以形成谐振电路，该谐振电路具有在上部具有谐振峰值的二次频率响应特性或通带的较低频率端。

10. 发明授权

US4166251A System for removing interference distortion in the demodulated signal of a frequency-modulated signal 失效
标题翻译：在频率调制信号解调信号中去除干扰失真的系统
公开(公告)号：US4166251A
公开(公告)日：1979-08-28
申请号：US909663
申请日：1978-05-25
申请人： Yukinobu Ishigaki , Teruo Muraoka
发明人： Yukinobu Ishigaki , Teruo Muraoka
IPC分类号： H03D3/00
CPC分类号： H03D3/002
摘要： A system comprising a demodulator for demodulating an input FM signal which has been subjected to interference by another FM signal, an envelope detector for detecting the envelope of fluctuation of the amplitude of the input signal, an AGC circuit for controlling the level of the input signal supplied to the envelope detector, a capacitor for passing only the AC component of the output of the envelope detector, a circuit having a transfer characteristic of a hyperbolic function and converting the waveform of the AC component, an analog multiplier supplied at its x input terminal with the output of the waveform converting circuit and producing a distortion cancellation signal, a first operation circuit supplied with the output signal of the demodulator and with the distortion cancellation signal and carrying out an operation such as substantially cancelling the interference distortion of the demodulated signal with the distortion cancellation signal, a delay circuit for delaying the output signal of the first operation circuit or of the demodulator by a specific time, and a second operation circuit supplied with the output signal of the first operation circuit or of the demodulator and with the output signal of the delay circuit, thereby carrying out a signal combining operation and supplying the resulting output signal to the y input terminal of the analog mutliplier. The output of the first operation circuit is demodulated signal in which the interference distortion has been canceled and thus removed.

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