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    • 1. 发明专利
    • Automatic gain control circuit
    • 自动增益控制电路
    • JPS5917784A
    • 1984-01-30
    • JP12578782
    • 1982-07-21
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • OKADA YOSHINORINAKAGAWA HIMIOFURUHATA MAKOTOMORI TAKAYUKI
    • H04N5/53H04N5/91
    • H04N5/91
    • PURPOSE:To make it difficult to generate a malfunction when the pulse width of a synchronizing signal generated from a separating circuit is narrower than a prescribed value, by providing an LPF and a comparing amplifier between the synchronizing signal separating circuit and a delay pulse generator. CONSTITUTION:A synchronizing signal 11 generated from a synchronizing signal separating circuit 10 becomes a signal 29 through an LPF26. This signal 29 is compared with a voltage 30 of a reference voltage source 28 in a comparing amplifier 27, and a level higher than the voltage 30 is detected. Consequently, a synchronizing signal 31 which has the phase delayed somewhat but has no erroneous output is obtained from the amplifier 27. This synchronizing signal 31 is supplied to a delay pulse generator 18, and the generator 18 generates pulses 20 only in the back porch time, and a normal signal to be detected is obtained. That is, even if an erroneous synchronizing signal is outputted once to lock an AGC erroneously, a normal AGC operation is performed.
    • 目的:通过在同步信号分离电路和延迟脉冲发生器之间设置LPF和比较放大器,当从分离电路产生的同步信号的脉冲宽度窄于规定值时,难以产生故障。 构成:从同步信号分离电路10产生的同步信号11通过LPF26成为信号29。 将该信号29与比较放大器27中的参考电压源28的电压30进行比较,并且检测到高于电压30的电平。 因此,从放大器27获得具有稍微延迟但没有错误输出的相位的同步信号31.该同步信号31被提供给延迟脉冲发生器18,并且发生器18仅在后沿时间产生脉冲20 ,并且获得要检测的正常信号。 也就是说,即使输出错误的同步信号一次来错误地锁定AGC,就执行正常的AGC操作。
    • 2. 发明专利
    • Fm modulator
    • FM调制器
    • JPS6118203A
    • 1986-01-27
    • JP13716284
    • 1984-07-04
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • OKADA YOSHINORIFUKUSHIMA ISAOWATANABE HISAHARUYOSHIDA HIDEO
    • H03C3/08
    • PURPOSE: To improve the linearity of an FM modulator by connecting collector outputs of transistors (Trs) whose emitters are connected via a capacitor by way of a diode to provide the mutual relation of the change in both the collector outputs.
      CONSTITUTION: A current signal Ib in response to an input voltage signal 18 flows to the collector Trs 19, 20, a collector current of the Tr 20 flows to a Tr 23 through a capacitor 25 at the conducting state of the Tr 23 and the collector current of the Tr 19 flows to the Tr 23. The emitter voltage of the Tr 24 is lowered by the current Ib flowing to the capacitor 25 and the Tr 24 is conductive, then a part of the current Ib flows to a resistor 33, the base voltage of the Tr 23 is decreased rapidly and the collector current is lowered. Then a diode 27 starts conducting attended with the rapid reduction of the base voltage of the Tr 24 and the collector voltage of the Tr 23 is increased rapidly, and the operations above are repeated. Thus, a signal Ib is proportional to the change in the oscillating frequency and the linearity of the FM modulator is improved.
      COPYRIGHT: (C)1986,JPO&Japio
    • 目的:通过连接晶体管(Trs)的集电极输出,通过电容器通过二极管连接发射极以提供集电极输出的变化的相互关系,从而提高FM调制器的线性度。 构成:响应于输入电压信号18的电流信号Ib流到集电极Tr19,20,Tr20的集电极电流在Tr 23的导通状态下通过电容器25流到Tr 23,并且集电极 Tr19的电流流到Tr 23. Tr 24的发射极电压由流过电容器25的电流Ib降低,Tr 24导通,电流Ib的一部分流到电阻器33, Tr 23的基极电压迅速下降,集电极电流降低。 然后,随着Tr 24的基极电压的快速降低,二极管27开始导通,并且Tr 23的集电极电压迅速增加,并且重复上述操作。 因此,信号Ib与振荡频率的变化成比例,并且提高了FM调制器的线性度。
    • 3. 发明专利
    • Limiting circuit for sound signal amplitude
    • 限制声音信号振幅的电路
    • JPS6116001A
    • 1986-01-24
    • JP13512084
    • 1984-07-02
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • YOSHIDA HIDEOOKADA YOSHINORIWATANABE HISAHARU
    • G11B5/02G11B5/027G11B20/02G11B20/06H04N5/91
    • G11B20/06
    • PURPOSE:To improve the reproduced sound quality with no deterioration in the picture quality by setting an equal signal control level between the upper and lower sides of the waveform amplitude in order to increase an area which is free from the deterioration in the distortion factor of the sound signal in case the input is excessive for the sound signal to be supplied to a limiting circuit for sound signal amplitude. CONSTITUTION:Sound signals 1 and 1' are supplied to pre-emphasis circuits 2 and 2' and delivered 10 and 10' after the control given to their amplitudes from a limiting circuit 3 for sound signal amplitude and then the FM modulation received from voltage control oscillators 4 and 4' respectively. The circuit 3 connects the output of a stabilized power supply circuit 11 to resistances 12 and 13 and flows currents to constant current Tr19 and 21. An equal difference of potential is secured between the base potentials of the Tr19 and 21 and the output of the circuit 11 by setting the equal resistance value between both resistances 12 and 13. For the sound signal of a sound signal amplitude control terminal 22 which is decided by the base potentials of Tr19 and 21, an area free from the deterioration in the distortion factor is increased since the same signal level is secured between the upper and lower sides of the waveform amplitude and then the same sound signal distortion factor secured between the low and high frequency sides in case the inputs of signals 1 and 1' are excessive.
    • 目的:为了通过在波形幅度的上下两边设置相等的信号控制电平来提高再现的音质,而不会降低图像质量,以便增加无畸变因子的劣化的面积 在声音信号被提供给用于声音信号幅度的限制电路的输入过大的情况下的声音信号。 构成:声音信号1和1'被提供给预加重电路2和2',并且在对来自限制电路3的声音信号幅度给予它们的幅度的控制之后递送10和10',然后从电压控制接收到FM调制 振荡器4和4'。 电路3将稳定电源电路11的输出连接到电阻12和13,并将电流流向恒定电流Tr19和21.在Tr19和21的基极电位与电路的输出之间确保相等的电位差 对于由Tr19和21的基极电位决定的声音信号幅度控制端子22的声音信号,增加了失真因子的劣化的区域 因为在波形幅度的上下两侧之间确保相同的信号电平,并且在信号1和1'的输入过大的情况下,固定在低频和高频侧之间的相同声音信号失真因子。
    • 4. 发明专利
    • Schmitt trigger circuit
    • SCHMITT触发电路
    • JPS5780824A
    • 1982-05-20
    • JP15586180
    • 1980-11-07
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • FUKUSHIMA ISAOITOIGAWA KEIICHIOKADA YOSHINORIOKAMOTO CHIKAYUKI
    • H03K3/2893H03K5/08
    • H03K3/2893
    • PURPOSE:To enlarge a hysteresis to reduce the variance of the turning-on and off level of a transistor, by changing practically the resistance value of the common emitter resistance of a Schmitt trigger circuit by the turning-on and off of the transistor. CONSTITUTION:A Schmitt trigger circuit consists of transistors TRs 5 and 6 and resistances 1, 3, 2, 12, and 13. A series circuit of a TR7 and a resistance 4 which has a resistance value sufficiently larger than a resistance value R2 of the resistance 2 is connected in parallel to the resistance 2 of this circuit. A series circuit of a resistance 15, a TR8, and a resistance 16 is connected between a power source 14 and the earth, and the collector output of the TR5 is applied to the base of the TR8, and the collector output of the TR8 is applied to the base of the TR7. R2/R3 (R2 and R3 are respective resistance values of resistances 2 and 3) is set to a large value to raise the turning-on level of the TR5.
    • 目的:通过改变晶体管的导通和截止来实际施加施密特触发电路的公共发射极电阻的电阻值来扩大滞后以减小晶体管的导通和截止电平的方差。 构成:施密特触发电路由晶体管TR5和6以及电阻1,3,2,12和13组成。TR7和电阻4的串联电路具有足够大的电阻值R2的电阻值 电阻2与该电路的电阻2并联。 在电源14和地之间连接电阻15,TR8和电阻16的串联电路,TR5的集电极输出施加到TR8的基极,TR8的集电极输出为 适用于TR7的底座。 R2 / R3(R2和R3是电阻2和3的各自的电阻值)被设定为较大的值以提高TR5的接通电平。
    • 5. 发明专利
    • Magnetic recording and reproducing device
    • 磁记录和再现设备
    • JPS6118288A
    • 1986-01-27
    • JP13716384
    • 1984-07-04
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • OKADA YOSHINORIFUKUSHIMA ISAOWATANABE HISAHARUYOSHIDA HIDEO
    • G11B5/02G11B5/027H04N9/802H04N9/835H04N9/84
    • H04N9/8355
    • PURPOSE: To stabilize the carrier frequency by constituting a phase locked loop using a chrominance subcarrier as a reference input and fixing two sound FM carrier frequencies to a prescribed relation with the frequency of the chrominance subcarrier.
      CONSTITUTION: The 1st sound signal 1 is inputted to an FM modulation circuit 38, the signal is subject to frequency modulation in response to the sound signal and fed to a mixing circuit 39. An output of the circuit 38 is inputted to a frequency division circuit 40, where it is subject to n
      1 frequency division and the result is fed to a phase comparator 41. A frequency division circuit 51 applies n
      2 frequency division to an input chroma continuous signal fSC, the circuit 41 feeds back the signal in response to the phase difference between the n
      1 frequency division signal and the n
      2 frequency division signal to the circuit 38 via an LPF42 to constitute a PLL. Thus, the carrier frequency f
      1 of the circuit 38 is locked in the relation of f
      1 =n
      1 /n
      2 fSC. Similarly, the 2nd sound signal 1' locks the carrier frequency f
      2 of an FM modulation circuit 43 in the relation of f
      2 = m
      1 /m
      2 fSC. Both the FM waves are mixed in the circuit 39, fed to rotary sound heads 49, 50 and recorded on a tape.
      COPYRIGHT: (C)1986,JPO&Japio
    • 目的:通过使用色度副载波作为参考输入构成锁相环,并将两个声音FM载波频率固定为与色度副载波的频率规定的关系来稳定载波频率。 构成:将第一声音信号1输入到FM调制电路38,对该信号进行频率调制,并输入到混频电路39.电路38的输出输入到分频电路 40,其中进行n1分频并将结果馈送到相位比较器41.分频电路51对输入色度连续信号fSC施加n2分频,电路41响应于相位反馈信号 n1分频信号与n2分频信号之间的差异通过LPF42发送到电路38以构成PLL。 因此,电路38的载波频率f1被锁定在f1 = n1 / n2fSC的关系中。 类似地,第二声音信号1'以f2 = m1 / m2fSC的关系来锁定FM调制电路43的载波频率f2。 两个FM波在电路39中混合,馈送到旋转声头49和50并记录在磁带上。
    • 6. 发明专利
    • Integrated circuit
    • 集成电路
    • JPS60214620A
    • 1985-10-26
    • JP7088184
    • 1984-04-11
    • Hitachi LtdHitachi Micro Comput Eng LtdHitachi Video Eng Co Ltd
    • KUDOU MITSURUOKADA YOSHINORIITOIGAWA KEIICHIKANARI SHIGEAKISASAKI MASAHIRO
    • H03H11/04H03H11/12
    • H03H11/1291H03H11/04
    • PURPOSE:To vary the absolute value of the electrostatic capacity of a capacitor while holding the electrostatic capacity ratio of the capacitor constant by using junction capacitance for the capacitor constituting an active filter. CONSTITUTION:Amplifiers 4 and 5 have a gain K1 and resistances R1 and R2 and capacitors C1 and C2 form the time constant circuit of a secondary LPF. The C1 and C2 are formed of junction capacitance of a semiconductor and the connection points between the C1 and an amplifier 4 and the connection points between the C2 and an amplifier 5 are connected mutually in terms of AC. A signal v3 from a signal source 6 is given a DC potential by a constant voltage source V0 and supplied to the amplifier 4 through the primary LPF of the R1 and C1 and the primary LPF of the R2 and C2. An amplifier 5 is supplied with the potential of the voltage source V0 and the DC potential of a variable voltage source V1 is applied to the other-side inputs of the amplifiers 4 and 5. Then, the absolute value of the electrostatic capacity is varied while holding the electrostatic capacity ratio of the C1 and C2 is held constant by varying the potential of the voltage source V1.
    • 目的:通过使用构成有源滤波器的电容器的结电容,使电容器的静电电容比保持恒定,来改变电容器的静电容量的绝对值。 构成:放大器4和5具有增益K1,电阻R1和R2以及电容器C1和C2形成次级LPF的时间常数电路。 C1和C2由半导体的结电容形成,并且C1和放大器4之间的连接点和C2与放大器5之间的连接点在AC方面相互连接。 来自信号源6的信号v3由恒定电压源V0给予DC电位,并通过R1和C1的主LPF和R2和C2的主LPF提供给放大器4。 放大器5被供给电压源V0的电位,并且可变电压源V1的DC电位被施加到放大器4和5的另一侧输入。然后,静电容量的绝对值变化,同时 通过改变电压源V1的电位,保持C1和C2的静电容量比保持恒定。
    • 7. 发明专利
    • Video signal processing circuit
    • 视频信号处理电路
    • JPS58177501A
    • 1983-10-18
    • JP5814782
    • 1982-04-09
    • Hitachi LtdHitachi Micro Comput Eng Ltd
    • OKADA YOSHINORINAKAGAWA HIMIOFURUHATA MAKOTOMORI TAKAYUKI
    • G11B20/02H04N5/91
    • H04N5/91
    • PURPOSE:To obtain a luminance signal for recording and a video signal for monitoring without distortion and to prevent deterioration in reproduced picture quality by providing a common base amplifier consisting of the 1st TR and the 2nd TR having its emitter connected to the emitter of the 1st TR, and controlling their base voltage in accordance with reproduction and recording. CONSTITUTION:During recording, a TR78 turns on by a constant voltage source 44 and a TR77 turns off. The 1st common base type TR circuit consisting of a TR53, resistance 57, constant voltage source 61, and constant current source 63 operates to generate the luminance signal for recording to a terminal 76 at the base of a TR54. Said luminance signal appears at a terminal 75 by the constant current source of a TR56 and a resistance 60. During reproduction, the constant voltage source 44 turns off, the TR78 turns off, and a constant voltage source 81 impresses a voltage to the base of the TR77, and the TR77 constitutes the 2nd common base type TR circuit and the power source 61 is lower than the source 81, so a TR53 turns off. The reproduced video signal at the terminal 76 is not generated at the base of the TR54 and does not leak into a de-emphasis circuit 21 through the base-collector capacitance of the TR54. The terminal 76 is connected to the common base type circuit, so no waveform distortion due to the mismatching of an LPF4 occurs.
    • 目的:为了获得用于记录的亮度信号和用于没有失真的监视的视频信号,并且通过提供由第一TR和第二TR组成的公共基本放大器来防止再现的图像质量的劣化,其发射极连接到第一 TR,并根据再现和记录来控制它们的基极电压。 构成:在记录期间,TR78通过恒定电压源44导通,TR77关闭。 由TR53,电阻57,恒压源61和恒流源63组成的第一公共基极型TR电路用于产生用于记录在TR54的基极处的端子76的亮度信号。 所述亮度信号由TR56的恒流源和电阻60出现在端子75处。在再生期间,恒压源44截止,TR78截止,恒压源81将电压施加到 TR77和TR77构成第二公共基极型TR电路,电源61低于源极81,因此TR53截止。 端子76处的再现视频信号不是在TR54的基极处产生的,并且不通过TR54的基极集电极电容泄漏到去加重电路21中。 端子76连接到公共基极型电路,因此不会发生由于LPF4的不匹配引起的波形失真。