In Vehicle Patents (Class 455/297)
  • Patent number: 4777659
    Abstract: 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: Grant
    Filed: January 28, 1987
    Date of Patent: October 11, 1988
    Assignees: U.S. Philips Corporation, Hans Kolbe & Co.
    Inventors: Heinz Lindenmeier, Ernst Manner, Gerhard Flachenecker
  • Patent number: 4766580
    Abstract: 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: Grant
    Filed: September 30, 1985
    Date of Patent: August 23, 1988
    Assignee: Pioneer Electronic Corporation
    Inventors: Yasunao Go, Yoshiharu Ueki, Minoru Motohashi, Kouzou Nozawa, Norihisa Urayama
  • Patent number: 4703501
    Abstract: 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: Grant
    Filed: May 19, 1986
    Date of Patent: October 27, 1987
    Assignee: Pioneer Electronic Corporation
    Inventors: Yoshiro Sugai, Hiroyuki Kimura
  • Patent number: 4694500
    Abstract: 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: Grant
    Filed: February 28, 1986
    Date of Patent: September 15, 1987
    Assignee: Clarion Co., Ltd.
    Inventors: Satoru Tazaki, Yasuhiro Yoshioka, Kiyoshi Amazawa
  • Patent number: 4673832
    Abstract: 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: Grant
    Filed: March 13, 1986
    Date of Patent: June 16, 1987
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Yuichi Murakami, Tomohiro Yamamoto
  • Patent number: 4584714
    Abstract: 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: Grant
    Filed: June 18, 1984
    Date of Patent: April 22, 1986
    Assignee: Nissan Motor Company, Limited
    Inventor: Hiroshige Fukuhara
  • Patent number: 4525870
    Abstract: 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: Grant
    Filed: July 19, 1982
    Date of Patent: June 25, 1985
    Assignee: Nissan Motor Company, Limited
    Inventors: Hiroshige Fukuhara, Norio Fujiki
  • Patent number: 4499606
    Abstract: 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: Grant
    Filed: December 27, 1982
    Date of Patent: February 12, 1985
    Assignee: SRI International
    Inventor: William R. Rambo
  • Patent number: 4473755
    Abstract: 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 steps
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: September 25, 1984
    Assignee: Nissan Motor Company, Limited
    Inventors: Iwao Imai, Hiroshi Endo, Masazumi Sone, Hideo Kasuya
  • Patent number: 4449090
    Abstract: 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: Grant
    Filed: September 16, 1982
    Date of Patent: May 15, 1984
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hitoshi Gotoh
  • Patent number: 4441086
    Abstract: 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: Grant
    Filed: May 13, 1982
    Date of Patent: April 3, 1984
    Assignee: General Motors Corporation
    Inventors: James P. Karlow, Gary A. Hunt
  • Patent number: 4403350
    Abstract: 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: Grant
    Filed: April 20, 1981
    Date of Patent: September 6, 1983
    Assignee: Nissan Motor Company Limited
    Inventors: Iwao Imai, Masazumi Sone
  • Patent number: 4394779
    Abstract: 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: Grant
    Filed: February 6, 1981
    Date of Patent: July 19, 1983
    Assignee: Robert Bosch GmbH
    Inventor: Jens Hansen
  • Patent number: 4390749
    Abstract: 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: Grant
    Filed: April 13, 1981
    Date of Patent: June 28, 1983
    Assignee: Superscope, Inc.
    Inventor: Erik W. Pearson
  • Patent number: 4380824
    Abstract: 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: Grant
    Filed: February 12, 1981
    Date of Patent: April 19, 1983
    Assignee: Hitachi, Ltd.
    Inventor: Takao Inoue