公开(公告)号：US4620114A

公开(公告)日：1986-10-28

申请号：US646113

申请日：1984-08-31

申请人： Philip A. K. Moon

发明人： Philip A. K. Moon

IPC分类号： G01R29/08 ,  H03J3/14 ,  H03K5/24 ,  G01R19/165

CPC分类号： H03J3/14

摘要： A signal strength detector comprises first, second and third transistors of the same conductivity type. The emitter electrodes of each transistor are connected together and coupled with one of a pair of dc supply lines. The collector electrodes of the first and second transistors are each coupled with the other of the pair of dc supply lines. The base electrode of the first and second transistors are each coupled via a resistor to the base electrode of the third transistor. The collector electrode of the third transistor is effective to provide a source of output current which is representative of a differential signal level between the base electrodes of the first and second transistors.

摘要翻译： 信号强度检测器包括具有相同导电类型的第一，第二和第三晶体管。 每个晶体管的发射电极连接在一起并与一对直流电源线中的一个耦合。 第一和第二晶体管的集电极各自与一对直流电源线中的另一个耦合。 第一和第二晶体管的基极电极经由电阻器耦合到第三晶体管的基极。 第三晶体管的集电极有效地提供表示第一和第二晶体管的基极之间的差分信号电平的输出电流源。

公开(公告)号：US4464793A

公开(公告)日：1984-08-07

申请号：US383075

申请日：1982-05-28

申请人： Raymond F. Hanson

发明人： Raymond F. Hanson

IPC分类号： H03J3/14 ,  H04B1/16

CPC分类号： H03J3/14

摘要： A selection circuit for series connection between the output of the detector stage and the input of the audio amplifier. The selection circuit requires a minimum number of components and is useful to drive a tuning indicator or similar type circuit.

摘要翻译： 用于在检测器级的输出和音频放大器的输入之间串联连接的选择电路。 选择电路需要最少数量的组件，并且可用于驱动调谐指示器或类似类型的电路。

公开(公告)号：US4336534A

公开(公告)日：1982-06-22

申请号：US53714

申请日：1979-07-02

申请人： Morio Kumagai

发明人： Morio Kumagai

IPC分类号： H03J3/14 ,  H03J7/02 ,  G09G3/00

CPC分类号： H03J7/02 ,  H03J3/14

摘要： A control signal generator for use with a broadcast receiver having a signal level indicator including a plurality of sequentially actuated luminous elements. The received signal strength is indicated by the number of luminous elements which are lit. The control signal generator is responsive to the signal level indicator to provide control signals for automatic frequency control circuitry and/or muting circuitry. The signal level indicator may include cicuitry for converting arbitrarily selected changes in the received signal to changes the indicator normally detects to thereby effect the sequential actuation of the luminous elements in accordance with the arbitrarily selected changes in the received signal.

摘要翻译： 一种与广播接收机一起使用的控制信号发生器，具有包括多个依次致动的发光元件的信号电平指示器。 接收到的信号强度由点亮的发光元件的数量表示。 控制信号发生器响应于信号电平指示器来提供用于自动频率控制电路和/或静噪电路的控制信号。 信号电平指示器可以包括用于将接收到的信号中的任意选择的变化转换成指示器正常检测到的改变，从而根据接收到的信号中任意选择的变化来实现发光元件的顺序启动。

公开(公告)号：US4320529A

公开(公告)日：1982-03-16

申请号：US24027

申请日：1979-03-26

申请人： Hidetoshi Maeda ,  Kazuo Inoue ,  Noboru Someno

发明人： Hidetoshi Maeda ,  Kazuo Inoue ,  Noboru Someno

IPC分类号： H03J7/18 ,  G01R23/10 ,  H03J1/00 ,  H03J1/04 ,  H03J3/14 ,  H04B1/16 ,  G01R23/02

CPC分类号： H03J1/0016 ,  H03J3/14

摘要： A frequency counting apparatus is advantageously utilized as a frequency counter for displaying in a digital manner the frequency being received by a radio receiver. The inventive frequency counting apparatus includes a quartz resonator adapted to oscillate at the frequency of 2.sup.n Hz where n is a positive integer, for example 32,768 Hz, and a microprocessor including a programming unit, an operating unit for making operation in accordance with a program of the programming apparatus, a counter and a control unit. The program steps of the programming unit are made to progress based on the oscillation output signal of the quartz resonator. The counter is supplied with a local oscillation signal of a radio receiver. The local oscillation signal supplied to the counter is gated for a predetermined time period determined in accordance with the program of the programming unit, whereby the local oscillation signal is counted. The count value in the counter is multiplied or divided by a prescribed correction factor preloaded in the programming unit by means of the operating unit.

摘要翻译： 频率计数装置有利地用作频率计数器，用于以数字方式显示由无线电接收机接收的频率。 本发明的频率计数装置包括适于以2nHz的频率振荡的石英谐振器，其中n是正整数，例如32768Hz，以及包括编程单元的微处理器，用于根据程序进行操作的操作单元 编程装置，计数器和控制单元。 基于石英谐振器的振荡输出信号使编程单元的编程步骤进行。 计数器被提供有无线电接收机的本地振荡信号。 提供给计数器的本地振荡信号被选通根据编程单元的程序确定的预定时间段，从而对本地振荡信号进行计数。 计数器中的计数值乘以运算单元在编程单元中预先加载预定的校正系数。

公开(公告)号：US4247950A

公开(公告)日：1981-01-27

申请号：US17061

申请日：1979-03-02

申请人： Yasuhiko Okuyama ,  Takeshi Takiya

发明人： Yasuhiko Okuyama ,  Takeshi Takiya

IPC分类号： G01R23/10 ,  H03J1/04 ,  H03J3/14 ,  H04B1/26

CPC分类号： G01R23/10 ,  H03J1/048 ,  H03J3/14

摘要： A display in a superheterodyne receiver having a local oscillator, adapted for displaying in a digital manner the frequency of a signal being received by the receiver by counting the local oscillation frequency by means of a preset counter wherein the data for the prescribed intermediate frequency or the complement thereof is preset. A reference voltage is generated by means of a variable resistor for correcting the difference between the preset value for the prescribed intermediate frequency and the actual intermediate frequency of the intermediate frequency stage of a receiver as actually manufactured, and a comparison voltage is obtained by digital/analog converting the output of a multiple-bit counter which is stepped responsive to clock pulses. The reference voltage and the comparison voltage are compared and the preset counter is supplied through a gate controlled responsive to the comparison output with the clock pulses of the number associated with the difference between both voltages, whereby the preset value in the preset counter is corrected.

摘要翻译： 具有本地振荡器的超外差接收机中的显示器，适于以数字方式显示由接收机接收的信号的频率，该预定计数器通过预设计数器计数本地振荡频率，其中规定的中频或 其补码是预设的。 通过可变电阻器产生参考电压，用于校正实际制造的接收机的规定中频预设值与实际中频之间的差异，并且通过数字/ 模拟转换响应于时钟脉冲而阶梯的多位计数器的输出。 比较参考电压和比较电压，并且通过响应于比较输出的门控对与两个电压之间的差值相关联的数字的时钟脉冲进行控制来提供预设计数器，从而校正预设计数器中的预设值。

公开(公告)号：US4180777A

公开(公告)日：1979-12-25

申请号：US859538

申请日：1977-12-12

申请人： Tsuneo Yamada ,  Yukihiko Miyamoto

发明人： Tsuneo Yamada ,  Yukihiko Miyamoto

IPC分类号： H03D3/00 ,  G01R23/06 ,  H03J3/14 ,  H04B1/16

CPC分类号： H03J3/14

摘要： A tuning meter circuit for use with a pulse count FM demodulator of an FM receiver. The circuitry comprises a limiter circuit for amplitude limiting a frequency modulated input signal to produce a train of pulses the width of which varies in accordance with the frequency modulation of the input signal; a pulse shaping circuit for generating a trigger pulse for each of the pulses of the pulse train; a monostable multivibrator responsive to each trigger pulse for generating a train of pulses of substantially constant width, the number of which per unit time interval varies in accordance with the frequency modulation of the input signal; a low pass filter responsive to the last mentioned pulse train to produce a low frequency signal and thereby demodulate the frequency modulated signal; a difference amplifier also responsive to the last-mentioned pulse train, the difference amplifier having a threshold level at which it changes state; a tuning meter responsive to the direct current component of the output of the difference amplifier; the duty cycle of the monostable multivibrator and the threshold level of the difference amplifier being so related that the tuning indicator indicates the FM receiver is tuned correctly when a signal of exact intermediate frequency is applied to the limiter circuit; and where the monostable multivibrator includes means for varying the duty cycle thereof to compensate for undesired variations in the FM demodulator.

摘要翻译： 用于FM接收机的脉冲计数FM解调器的调谐计电路。 该电路包括限幅器电路，用于对频率调制的输入信号进行幅度限制，以产生一列脉冲，其宽度根据输入信号的频率调制而变化; 脉冲整形电路，用于产生脉冲序列的每个脉冲的触发脉冲; 响应于每个触发脉冲的单稳态多谐振荡器，用于产生基本恒定宽度的脉冲序列，其每单位时间间隔的数量根据输入信号的频率调制而变化; 响应于最后提到的脉冲串的低通滤波器产生低频信号，从而解调频率调制信号; 差分放大器还响应于最后提到的脉冲串，差分放大器具有阈值电平，在该阈值电平处改变状态; 响应于差分放大器的输出的直流分量的调谐表; 单稳态多谐振荡器的占空比和差分放大器的阈值电平如此相关，当精确中频信号被施加到限幅器电路时，调谐指示符指示FM接收机被正确地调谐; 并且其中单稳态多谐振荡器包括用于改变其占空比以补偿FM解调器中不期望的变化的装置。

公开(公告)号：US3956594A

公开(公告)日：1976-05-11

申请号：US526817

申请日：1974-11-25

申请人： Seiji Hirata

发明人： Seiji Hirata

IPC分类号： H03J3/14 ,  H04B1/16 ,  H04H1/00 ,  H04H40/45 ,  H04H5/00

CPC分类号： H04B1/1646 ,  H03J3/14

摘要： An indicating circuit for an FM stereophonic signal receiver for providing dual indications of tuning and channel balance. The indicating circuit is comprised of a tuning detecting circuit for providing a first signal admitting of a magnitude and polarity which represents the relative tuning condition of the FM receiver with respect to a received FM signal. The indicating circuit further includes respective channel level detecting circuits for providing respective signals admitting of magnitudes that represent the levels of the audio signals transmitted through the respective stereophonic signal channels of the receiver. A signal indicating meter provides indications representing the magnitudes and polarities of signals applied thereto and a switching circuit selectively supplies the output of the tuning detecting circuit or the outputs of the channel level detecting circuits to the indicating meter, whereby the relative tuning condition of the receiver as well as the channel balance of the receiver is selectively indicated.

摘要翻译： 用于FM立体声信号接收机的指示电路，用于提供调谐和通道平衡的双重指示。 指示电路包括调谐检测电路，用于提供表示FM接收机相对于接收的FM信号的相对调谐状态的幅度和极性的第一信号。 指示电路还包括各自的信道电平检测电路，用于提供表示通过接收机的各个立体声信号信道发送的音频信号的电平的幅度的各个信号。 信号指示表提供表示施加到其上的信号的大小和极性的指示，并且开关电路选择性地将调谐检测电路的输出或信道电平检测电路的输出提供给指示仪，由此接收机的相对调谐条件 选择性地指示接收机的信道平衡。

公开(公告)号：US3895301A

公开(公告)日：1975-07-15

申请号：US36913773

申请日：1973-06-12

申请人： KAZUO KAWASAKI ,  KAZUO ARAI

发明人： KAZUO KAWASAKI ,  KAZUO ARAI

IPC分类号： H03J3/14 ,  H04B1/26

CPC分类号： H03J3/14

摘要： Single indication system comprises a common circuit having a variable intensity illumination device connected in series therewithin and having an end connected to one terminal of a source of potential. A pair of branch circuits are connected to the opposite end of the common circuit, and each branch circuit includes a respective resistor, the two resistors having greatly different ohmic values. One branch circuit is connected to the opposite terminal of the source of potential so as to be energized whenever the radio set is switched on. The other branch circuit is connected, through a switch, to a FM multiplex receiving circuit of the radio set, so as to be energized whenever the FM multiplex receiving circuit is switched on.

摘要翻译： 单指示系统包括具有与其串联连接的可变强度照明装置的公共电路，其端部连接到电位源的一个端子。 一对分支电路连接到公共电路的相对端，并且每个分支电路包括相应的电阻器，两个电阻器具有极大不同的欧姆值。 一个分支电路连接到电位源的相对端子，以便每当无线电设备被接通时被激励。 另一分支电路通过开关连接到无线电设备的FM多路复用接收电路，以便每当FM多路复用接收电路被接通时被激励。

公开(公告)号：US3882398A

公开(公告)日：1975-05-06

申请号：US32647773

申请日：1973-01-24

申请人： NIPPON MUSICAL INSTRUMENTS MFG

发明人： OGITA MINORU ,  MATSUI TERUYOSHI

IPC分类号： H03J3/14 ,  H04B1/16

CPC分类号： H03J3/14

摘要： A reference frequency signal is prepared by a fixed frequency oscillator or by multiplying the IF frequency. A receiving frequency representing signal is obtained as an output of the RF amplifier or that of the local oscillator. The two signals are mixed to produce a beat frequency signal, which is converted by a frequency detector into a d.c. voltage or current, which in turn is applied to a meter. The meter carries a scale marked in frequencies, the pointer indicating the receiving frequency.

摘要翻译： 参考频率信号由固定频率振荡器或通过乘以IF频率来准备。 获得接收频率表示信号作为RF放大器或本地振荡器的输出。 混合这两个信号以产生拍频信号，该频率信号由频率检测器转换成直流。 电压或电流，其又被施加到电表。

公开(公告)号：US3862354A

公开(公告)日：1975-01-21

申请号：US36651273

申请日：1973-06-04

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： KAWAMATA YUKIO ,  YAMAMOTO KEISUKE ,  FUJIMORI TOSHIMITSU

IPC分类号： H03J3/14 ,  H03K17/96 ,  H04N5/50

CPC分类号： H03K17/962 ,  H03J3/14 ,  H04N5/50 ,  Y10S200/02

摘要： A tuning indication circuit operating device for television receivers including a high frequency signal generating means, a switching circuit means responsive to the high frequency signal output for controlling the operation of a tuning indication controlling circuit, and a contactor forming part of a tuning adjustment knob and connected to the junction point between the high frequency generating means and the switching circuit means. When the contactor is touched with a band, the capacitance of the human body composes an imparting circuit for the output voltage of the high frequency signal generator means, and this imparted signal voltage is utilized to control the switching circuit means so as to render the tuning indication circuit operative, thereby to produce a tuning indication on the picture tube screen only when the adjustment knob is touched.

摘要翻译： 一种用于电视接收机的调谐指示电路操作装置，包括高频信号产生装置，响应于高频信号输出以控制调谐指示控制电路的操作的开关电路装置，以及形成调谐调节旋钮的一部分的接触器， 连接到高频产生装置和切换电路装置之间的接合点。 当接触器被带接触时，人体的电容构成用于高频信号发生器装置的输出电压的赋予电路，并且利用该赋予的信号电压来控制开关电路装置，以使调谐 指示电路工作，从而仅在触摸调节旋钮时在显像管屏幕上产生调谐指示。