| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | 接收电路 | CN200410078654.2 | 2004-09-17 | CN1599241A | 2005-03-23 | 冈本直树; 伊藤顺治 |
| 在接收电路中，天线11接收预定频带的高频信号，电平改变部件13改变天线所接收高频信号的信号电平，后级电路14对在电平改变部件13处改变了信号电平的高频信号执行预定的信号处理，检测部件32检测经后级电路14执行信号处理的高频信号的信号电平，以及控制部件33基于检测部件32所检测的高频信号的信号电平，设置电平改变部件13的高频信号改变率，从而使检测部件32所检测的高频信号的信号电平不会超过预定值。 | ||||||
| 2 | NF-Verstärker für ein Fernsehgerät | EP82104105.0 | 1982-05-12 | EP0069843B2 | 1991-04-03 | Geiger, Erich, Ing. grad.; Jaag, Herbert |
| 3 | NF-Verstärker für ein Fernsehgerät | EP82104105.0 | 1982-05-12 | EP0069843A1 | 1983-01-19 | Geiger, Erich, Ing. grad.; Jaag, Herbert |
Ein NF-Verstärker ist mit einem Differenz-Verstärker-IC ausgestattet. Fernsehempfangsgeräte können mit einer Detektorschaltung versehen sein, die eine Spannung bei Empfang eines Fernsehsenders abgibt, die nach der Erfindung zur Steuerung eines Halbleiterschalters verwendet wird, der auf einfache Weise über den invertierenden Eingang des Differenz-Verstärkers eine Ruhestromreduzierung im Stand-By-Betrieb, eine Stummsteuerung bei Empfang keines Fernsehsignals und eine Einschalt- und Ausschaltgeräuschunterdrückung bewirkt. Das geschieht, indem wie die Zeichnung zeigt, ein unterteilter Vorwiderstand (15, 17) zwischen dem Betriebsspannungsanschluß (UB) und über ein RC-Glied (12, 16) einer Gegenkopplung an dem invertierenden Eingang (Anschluß 2) des IC liegt. Der HalbleIterschalter erlaubt die Abschaltung der den IC sperrenden Spannung in Abhängigkeit von der Detektorschaltungsspannung. |
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| 4 | Adaptive Supply Voltage for a Power Amplifier | US14356622 | 2011-11-22 | US20140306770A1 | 2014-10-16 | Udo-Michael Vetter |
| A signal-processing system has an amplifier that generates an amplified (RF) output signal based on an (RF) input signal. The amplifier receives a supply voltage that can be selectively set to an appropriate level between a lower power supply level and a higher power supply level. With one power supply permanently connected to the supply voltage node, a control unit executes software to toggle a supply switch to periodically connect and disconnect the other power supply thereby generating a weighted average value for the supply voltage between the two power supply levels. When a sudden and large increase occurs in the (input) power level, hardware-interrupt circuitry interrupts and supersedes the software-based control of the supply-voltage switch to quickly switch the supply voltage towards the higher power supply level. The hardware-interrupt circuitry handles such situations faster than the software-based control in order to prevent a limit violation of spectrum emission requirements. | ||||||
| 5 | System for detecting current in an output stage of a power amplifier | US11050245 | 2005-02-03 | US07315152B1 | 2008-01-01 | Darrell G. Epperson; Ulrik Riis Madsen |
| A system for detecting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal is provided. In general, the mobile terminal includes power amplifier circuitry, power control circuitry, current detection circuitry, and an inductor that essentially prevents radio frequency coupling between the power control circuitry and the power amplifier circuitry. Based on a voltage across the inductor, the current detection circuitry generates a voltage detection signal indicative of a current in the inductor and thus the current in an output stage of the power amplifier. | ||||||
| 6 | Receiving circuit | US10942844 | 2004-09-17 | US20050064841A1 | 2005-03-24 | Naoki Okamoto; Junji Ito |
| In a receiving circuit, an antenna 11 receives a high-frequency signal at a predetermined frequency band, a level changing section 13 changes a signal level of the high-frequency signal received by the antenna, a subsequent-stage circuit 14 performs predetermined signal processing for the high-frequency signal whose signal level is changed at the level changing section 13, a detecting section 32 detects a signal level of the high-frequency signal for which the signal processing is performed by the subsequent-stage circuit 14, and a control section 33 sets a rate of change of the high-frequency signal by the level changing section 13, based on the signal level of the high-frequency signal detected by the detecting section 32, so that the signal level of the high-frequency signal detected by the detecting section 32 does not exceed a predetermined value. | ||||||
| 7 | Muting circuit for an FM radio receiver | US290564 | 1981-08-06 | US4398060A | 1983-08-09 | Masanori Ienaka; Yoshimi Iso |
| Signal transmitting operation is effected in a muting circuit when a first constant current source connected to the emitters of first and second transistors is operative with a second constant current source connected to the emitters of third and fourth transistors being inoperative. The signal transmitting operation is not effected in the opposite case. A bias resistor is interposed between the bases of the first and third transistors. To eliminate the popping noise when the power source is turned on, a switching element is connected parallel to the bias resistor and is kept in the ON state for a predetermined period of time after making of the power source.In an FM radio receiver, the output signal of a detuning detection circuit is applied to the input terminals of first and second mute control circuits, and the muting operation of a pre-amplifier for amplifying a stereo composite signal is controlling by the first mute control circuit while the muting operation of a muting circuit connected to the output of a stereo demodulation circuit is controlled by the second mute control circuit. Discrimination levels of these first and second mute control circuits are set to mutually different levels to eliminate occurrence of the popping noise at the time of changes from tuning to detuning and vice versa. | ||||||
| 8 | Sound motion picture camera | US71587 | 1979-08-31 | US4311369A | 1982-01-19 | Yutaka Kohtani |
| In the disclosed sound motion picture camera, a sound overlap device keeps the sound level constant during a predetermined time after the start of a fade out operation, then gradually lowers the sound level and then gradually raises the sound level during the start of a fade in operation. | ||||||
| 9 | Signal level-to-pulse rate converter | US3660782D | 1970-08-24 | US3660782A | 1972-05-02 | FRIEDMAN DAVID; LEVY KENNETH |
| An electronic circuit for generating pulses at a rate and of a nature representative of an input signal level. In order to limit the rate of change in the pulse rate to a rate of change at which an element driven by the pulses can respond, a filter is provided which establishes a maximum positive and negative slope for the signal waveform. The same slope is achieved for any abrupt step in the input signal level regardless of the magnitude of the step change. The slope-limited signal is then fed to a symmetrical zero-to-plus or minus infinite rate integrator which establishes a dead-band range surrounding the zero level. When the slopelimited signal level is outside the dead-band range, the integration proceeds at a rate proportional to the amount by which the signal level exceeds the dead-band until a positive or negative threshold level is reached, at which time a pulse is generated and the integrator reset to a lower magnitude. The pulse rate is thus proportional to the amount by which the input signal level exceeds the established dead-band.
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| 10 | A switching circuit operable as an amplifier and a muting circuit | EP83105382.2 | 1983-05-31 | EP0095774B1 | 1989-10-18 | Miyata, Shinji c/o NEC IC Microcomputer Syst. Ltd. |
| 11 | A switching circuit operable as an amplifier and a muting circuit | EP83105382 | 1983-05-31 | EP0095774A3 | 1986-03-26 | Miyata, Shinji c/o NEC IC Microcomputer Syst. Ltd. |
A switching circuit for achieving the amplifying and muting operations is disclosed. The switching circuit operates as a non-inverting feedback amplifier whenever the circuit performs either amplification or muting. The non-inverting input port of the amplifier is always kept free to receive a given signal. An impedance element is connected to the output terminal of the circuit in either the amplifying or muting operation. |
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| 12 | NF-Verstärker für ein Fernsehgerät | EP82104105.0 | 1982-05-12 | EP0069843B1 | 1985-11-13 | Geiger, Erich, Ing. grad.; Jaag, Herbert |
| 13 | A switching circuit operable as an amplifier and a muting circuit | EP83105382.2 | 1983-05-31 | EP0095774A2 | 1983-12-07 | Miyata, Shinji c/o NEC IC Microcomputer Syst. Ltd. |
A switching circuit for achieving the amplifying and muting operations is disclosed. The switching circuit operates as a non-inverting feedback amplifier whenever the circuit performs either amplification or muting. The non-inverting input port of the amplifier is always kept free to receive a given signal. An impedance element is connected to the output terminal of the circuit in either the amplifying or muting operation. |
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| 14 | Adaptive supply voltage for a power amplifier | US15482543 | 2017-04-07 | US09948262B2 | 2018-04-17 | Udo-Michael Vetter |
| In one embodiment, a signal-processing apparatus for generating an amplified output signal based on an input signal is provided. The apparatus comprises: an amplifier configured to generate the output signal, wherein the amplifier is configured to receive a supply voltage; and a limiter configured to inhibit increases in the input signal power level from being applied to the amplifier, wherein the limiter comprises: a variable attenuator configured to selectively attenuate the input signal before being applied to the amplifier; wherein the limiter integrates over a voltage difference between a current measure of attenuated input signal power level and a limiter threshold level to control a level of attenuation applied by the variable attenuator to the input signal. | ||||||
| 15 | Switching circuit operable as an amplifier and a muting circuit | US499703 | 1983-05-31 | US4491800A | 1985-01-01 | Shinji Miyata |
| A switching circuit for achieving the amplifying and muting operations is disclosed. The switching circuit operates as a non-inverting feedback amplifier whenever the circuit performs either amplification or muting. The non-inverting input port of the amplifier is always kept free to receive a given signal. An impedance element is connected to the output terminal of the circuit in either the amplifying or muting operation. | ||||||
| 16 | Automatic audio mixing selector device | US113656 | 1980-01-21 | US4306114A | 1981-12-15 | Jeffery C. Callahan |
| An automatic mixing selector device for use with an audio amplifier or tuner for automatic priority selection and digital fading of two or more audio sources using the amplifier and tuner controls. The circuit comprises a priority selector circuit which monitors the designated priority audio source for signal amplitude and duration, a micro-computer then operates a digital fader to phase in the priority signal and also to phase in the alternate signal in the absence of a sufficient priority signal. | ||||||
| 17 | Polarity correcting circuit | US954927 | 1978-10-26 | US4228368A | 1980-10-14 | Robert A. Orban |
| A circuit for controlling the polarity of an asymmetrical waveform, such as a typical audio waveform, is described. The circuit provides smooth polarity switching with substantially no audible switching sound. The smooth switching results from switching each frequency of the audio signal at a different time. The circuit is particularly useful in a peak-limiting apparatus such as those often used in AM broadcasting. | ||||||
| 18 | Current proportioning circuit | US40399073 | 1973-10-05 | US3914684A | 1975-10-21 | LEIDICH ARTHUR JOHN |
| A first current is applied to the joined emitter electrodes of a first and a second transistor to be split into a first and a second fractions related in the ratio hfen to 1, which fractions flow as their respective collector currents. (The common-emitter forward current gain of the first transistor is hfe.) A first and a second paths extend from a common connection to respective base electrodes of the first and second transistors. Each path includes n junction diode(s) connected in series with the baseemitter junction of the transistor to which the path connects. A second current related to the first is applied to the second path to apply additional forward bias to the n diode(s) therein.
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| 19 | Differential amplifier circuit | US3781699D | 1972-09-27 | US3781699A | 1973-12-25 | SAKAMOTO Y |
| A differential amplifier circuit which comprises an emitter follower transistor adapted to operate at the same time the power supply is turned on, the output of said transistor being fed to the first input of the differential amplifier and servicing to charge a capacitor connected to the second input of said differential amplifier, whereby the rise of the output signal is made quick and the so-called pop signal normally produced in the amplifier is eliminated.
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| 20 | Variable bandpass dynamic noise filter | US3753159D | 1971-07-26 | US3753159A | 1973-08-14 | BURWEN R |
| A variable bandpass filter for a dynamic noise filtering effect that reduces the perceptible noise in an audio reproduction system. The variable bandpass filter responds to peak signal levels in relatively high and relatively low frequency portions of the audio spectrum to automatically and independently vary high and low frequency cutoff points for the filter in correspondence with the level of signals at those frequencies. Low distortion and wide dynamic range is achieved in a filter configuration which comprises a forward signal path and a reverse signal path, each having a variable integration response provided by temperature compensated and linearized field-effect transistor circuits. The integration response of the two paths imparts a high and low frequency filtering effect. A further constant gain feedback path establishes a uniform middle frequency amplification for the variable bandpass filter.
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