In Vehicle Patents (Class 455/297)
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Patent number: 4777659Abstract: A detector for indicating reception disturbances during frequency modulated ultrashort wave broadcast reception, particularly in power vehicles, has a detector for indicating frequency disturbance deviations in high frequency or intermediate frequency carriers and an amplitude modulation detector for indicating disturbance amplitude modulation in the high frequency or intermediate frequency carrier, and an evaluating circuit with two inputs arranged so that the output signals of the detectors are supplied to the respective inputs of the evaluating circuit and an output signal of the evaluating circuit depends both on the disturbance amplitude modulation and the frequency disturbance deviation.Type: GrantFiled: January 28, 1987Date of Patent: October 11, 1988Assignees: U.S. Philips Corporation, Hans Kolbe & Co.Inventors: Heinz Lindenmeier, Ernst Manner, Gerhard Flachenecker
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Patent number: 4766580Abstract: An information reproducing system, such as an audio tape player, for automotive use, whereby errors which would otherwise occur when the engine is started are inhibited. The information reproducing system of the invention includes a voltage detector circuit for detecting the voltage of the automobile's battery, an operating unit for operating the recording medium in response to the supply of power from the battery so as to reproduce information stored on the recording medium, and a control unit for controlling the operating unit. In this system, the application of an operation command input to the control unit is inhibited when the voltage detector circuit detects a drop in the voltage of the battery at the time the engine is started. In addition, the inhibition of the operation command input is cancelled when the restoration of the voltage of the battery is detected.Type: GrantFiled: September 30, 1985Date of Patent: August 23, 1988Assignee: Pioneer Electronic CorporationInventors: Yasunao Go, Yoshiharu Ueki, Minoru Motohashi, Kouzou Nozawa, Norihisa Urayama
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Patent number: 4703501Abstract: A multiplex sound receiver in which a detection signal is extracted from a broadcast to indicate whether the broadcast is monaural, stereo, or multi-lingual. The detection signal is used for controlling the separating of the channels. According to the invention, the detection signal is processed in accordance with the strength of the broadcast or the noise level. For instance, the detection signal is integrated over a period that is increased when the field strength decreases.Type: GrantFiled: May 19, 1986Date of Patent: October 27, 1987Assignee: Pioneer Electronic CorporationInventors: Yoshiro Sugai, Hiroyuki Kimura
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Control voltage generating circuit for activating a noise reduction circuit in an FM stereo receiver
Patent number: 4694500Abstract: A high-cut and high-blend control voltage generating circuit for activating a noise reduction circuit of an FM stereo receiver is configured to be simply responsive to multipath noises and never to plug noises. A changing and discharging circuit in the control voltage circuit may have a relatively long charging time constant, and the voltage control circuit may be configured to be simply responsive to multipath noises above a predetermined level. Thus the circuit is much less liable to operate erroneously.Type: GrantFiled: February 28, 1986Date of Patent: September 15, 1987Assignee: Clarion Co., Ltd.Inventors: Satoru Tazaki, Yasuhiro Yoshioka, Kiyoshi Amazawa -
Patent number: 4673832Abstract: A safety device to prevent a vehicle-loaded electronic equipment from malfunctioning due to an influence of the high-level electric field. An antenna pattern for detecting the electric field is formed on the same printed board as the electronic equipment, and an electric signal level of the output from the antenna pattern is determined. When the determined level reaches a level at which the electronic equipment may malfunction, the equipment is forcibly controlled toward a safety range of operation.Type: GrantFiled: March 13, 1986Date of Patent: June 16, 1987Assignee: Aisin Seiki Kabushiki KaishaInventors: Yuichi Murakami, Tomohiro Yamamoto
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Patent number: 4584714Abstract: An automotive radio receiver with a radio frequency interference elimination includes a noise detector adapted to detect noise in the power source wiring and a circuit for eliminating radio frequency interference noise. The detector is physically connected to the power source wiring so that it can satisfactorily detect noise in the power source wiring such as spark ignition noise and switching noise of the automotive electric equipment. The noise elimination circuit includes a switch normally closed and responsive to the noise signal produced by the noise detector to open, and a capacitor for holding the radio signal level while the switch is opened and discharging the constant-level signal for reproduction of the radio sound.Type: GrantFiled: June 18, 1984Date of Patent: April 22, 1986Assignee: Nissan Motor Company, LimitedInventor: Hiroshige Fukuhara
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Patent number: 4525870Abstract: An automotive radio receiver with a radio frequency interference elimination includes a noise detector adapted to detect noise in the power source wiring and a circuit for eliminating radio frequency interference noise. The detector is physically connected to the power source wiring so that it can satisfactorily detect noise in the power source wiring such as spark ignition noise and switching noise of the automotive electric equipments. The noise elimination circuit includes a switch normally closed and responsive to the noise signal produced by the noise detector to open, and a capacitor for holding the radio signal level while the switch is opened and discharging the constant-level signal for reproduction of the radio sound.Type: GrantFiled: July 19, 1982Date of Patent: June 25, 1985Assignee: Nissan Motor Company, LimitedInventors: Hiroshige Fukuhara, Norio Fujiki
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Patent number: 4499606Abstract: A system for enhancing the quality of a signal received by a mobile FM transmitter by reducing the adverse effects of multipath transmission to the receiver. A pair of antennas is provided, and each antenna is arranged to receive transmitted signals that traverses a different path. The signal produced in the receiver by one antenna is compared with a reference threshold and when the amplitude of the signal falls below the reference threshold, the receiver switches to the other antenna. The signal amplitude is sensed in a high frequency portion of the receiver, i.e. before detection or demodulation, so that switching between antennas occurs rapidly and is normally not perceived by the user of the receiver.Type: GrantFiled: December 27, 1982Date of Patent: February 12, 1985Assignee: SRI InternationalInventor: William R. Rambo
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Patent number: 4473755Abstract: A device for preventing noise leakage externally from a digital electronic apparatus using a clock pulse generator, comprising: (a) a metal casing; (b) a printed circuit board housed within the metal casing into which the digital electronic apparatus is assembled having a plurality of land patterns formed thereon at the end of various signal lines of the digital electronic apparatus; (c) a connector attached at one end of the printed circuit board having a plurality of connector pins therewithin for connecting said land patterns with external various apparatus; (d) an insulative film positioned on one surface of the printed circuit board closely adjacent to the land patterns; (e) a conductive film coated on one surface of the insulative member and coupled electrically to the metal casing; and (f) a plurality of chip-type capacitors which bridges between the conductive film and plurality of land patterns for effecting noise filtering and a method of manufacturing the device described above comprising the stepsType: GrantFiled: April 8, 1982Date of Patent: September 25, 1984Assignee: Nissan Motor Company, LimitedInventors: Iwao Imai, Hiroshi Endo, Masazumi Sone, Hideo Kasuya
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Patent number: 4449090Abstract: A vehicle generator is provided with a noise reduction apparatus in the form of an inductor coil wound about a plate connecting an output capacitor to an output terminal.Type: GrantFiled: September 16, 1982Date of Patent: May 15, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Hitoshi Gotoh
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Patent number: 4441086Abstract: An audio system including audio processing circuit means interposed between a source of audio signals and a power amplifier. Power control circuitry including time delay means which respond to an on/off power switch for applying and removing power to the components of the audio system in a sequence which prevents audible pops associated with system start-up and shutdown.Type: GrantFiled: May 13, 1982Date of Patent: April 3, 1984Assignee: General Motors CorporationInventors: James P. Karlow, Gary A. Hunt
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Patent number: 4403350Abstract: An electronic system for controlling engine parameters or the like such as the amount of fuel supplied to the internal combustion engine of an automotive vehicle having a radio receiver, the control system having a plurality of digital processing units such as microcomputers, where each unit operates in synchronization with a clock pulse. There is provided a clock pulse generator for each digital processing unit, the frequency of which is selected so that the higher harmonics of one clock pulse has a frequency difference of 10 KHz or more from the higher harmonics of other clock pulses in a broadcast band, whereby interference which can disturb the reception of a broadcast signal is avoided.Type: GrantFiled: April 20, 1981Date of Patent: September 6, 1983Assignee: Nissan Motor Company LimitedInventors: Iwao Imai, Masazumi Sone
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Patent number: 4394779Abstract: Reflected signal distortion in vehicular FM receivers is eliminated or largely suppressed by providing a plurality of antenna elements of the vehicle antenna (13, 100) with different directional characteristics, which are selectively connected to the vehicle receiver (10, 30; 104, 106) if a reflection is sensed in the reflection recognition stage (30, 106). In one embodiment (FIG. 1), the antenna (13) is subdivided into an upper and a lower portion (14, 15), about one-third down its length, the lower portion being surrounded by shielding elements (17-20) positioned about 90.degree. offset from each other, and selectively connectable to, or disconnectable from, ground or vehicle chassis in dependence on sensed distortion or reflection recognition pulses, to reduce the effective antenna length and change the directivity.Type: GrantFiled: February 6, 1981Date of Patent: July 19, 1983Assignee: Robert Bosch GmbHInventor: Jens Hansen
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Patent number: 4390749Abstract: A noise control system for an FM stereo radio receiver is provided for controlling noise in the audio output, particularly in an area where the broadcast signal strength is relatively high. The system is designed for use with an FM stereo radio receiver having circuitry responsive to the strength of the broadcast radio signal for reducing stereo channel separation and/or high frequency response in low signal strength areas to prevent deterioration in the signal/noise ratio. The system includes a detection and control circuit for detecting the presence of relatively high noise levels substantially independent of the broadcast signal strength, such as multipath distortion encountered by a radio receiver in a vehicle moving through a high signal strength area. The detection and control circuit operates, in the presence of detected high noise levels, to control the adjustment circuitry to reduce channel separation and/or frequency response and thereby reduce the noise in the audio output.Type: GrantFiled: April 13, 1981Date of Patent: June 28, 1983Assignee: Superscope, Inc.Inventor: Erik W. Pearson
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Patent number: 4380824Abstract: A receiving reproducing system for an automotive radio detects the surrounding noise level other than the output sound thereof, in the sound field extending in the passenger compartment of an automobile, and the level which is dependent upon the received signal level of an antenna. The receiving reproducing system partly controls its output sound volume proportionally in accordance with the surrounding noise level and partly lowers its output sound volume in dependence upon the reduction in the received signal level. Even under the circumstances where the surrounding noise level is high and where the received signal level is low, the sound volume of the output sound containing many noises can be prevented from being raised.Type: GrantFiled: February 12, 1981Date of Patent: April 19, 1983Assignee: Hitachi, Ltd.Inventor: Takao Inoue