GB2386304A - A radio receiver - Google Patents

A radio receiver

Info

Publication number
GB2386304A
GB2386304A GB0312723A GB0312723A GB2386304A GB 2386304 A GB2386304 A GB 2386304A GB 0312723 A GB0312723 A GB 0312723A GB 0312723 A GB0312723 A GB 0312723A GB 2386304 A GB2386304 A GB 2386304A
Authority
GB
United Kingdom
Prior art keywords
signal
circuit
outputs
attenuating
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0312723A
Other versions
GB0312723D0 (en
Inventor
Patrick John Lyons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hi Key Ltd
Original Assignee
Hi Key Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hi Key Ltd filed Critical Hi Key Ltd
Publication of GB0312723D0 publication Critical patent/GB0312723D0/en
Publication of GB2386304A publication Critical patent/GB2386304A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Lock And Its Accessories (AREA)

Abstract

A variable frequency radio receiver (1) for a remote keyless entry system for a motor vehicle outputs a valid type data signal through a gate circuit (16) to a signal analysing circuit (3) for further analysing to determine if the data signal insludes a unique code specific to an electronic control unit (2) which controls an alarm circuit, a vehicle immobiliser and a central locking system of the motor vehicle. The radio receiver (1) comprises a micro-controller (4) which operates a variable frequency voltage controlled oscillator (8) for outputting a staircase variable frenquency signal to a mixer (9) where it is mixed with a received signal, and the mixer (9) outputs the received signal at an intermediate frequency which is filtered by an intermadiate frequency filter (10). The signal is then passed on a line (11) through an attenuating circuit (12) comprising five resistors (R1 to R5) which are selectively connectable by switches (SW1 to SW5) between the line (11) and ground, for selectively attenuating the signal for removing noise therefrom. The attenuated signal is fed to an intermediate frequency amplifier (14) and in turn to a demodulating circuit (15) outputs the data signal to the gate circuit (16). The micro.controller (4) analyses the data signal from the demodulating circuit (15) and selects the appropriate value of resistance from the resistors R1 to R5 to be connected between the line (11) and ground to provide the appropriate level of attenuation for attenuating the signal so that the noise level in the signal has little or no effect on the data.
GB0312723A 2000-12-28 2001-12-19 A radio receiver Withdrawn GB2386304A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE20001082 2000-12-28
PCT/IE2001/000158 WO2002054608A1 (en) 2000-12-28 2001-12-19 A radio receiver

Publications (2)

Publication Number Publication Date
GB0312723D0 GB0312723D0 (en) 2003-07-09
GB2386304A true GB2386304A (en) 2003-09-10

Family

ID=11042705

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0312723A Withdrawn GB2386304A (en) 2000-12-28 2001-12-19 A radio receiver

Country Status (3)

Country Link
GB (1) GB2386304A (en)
IE (1) IES20011088A2 (en)
WO (1) WO2002054608A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449199A2 (en) * 1990-03-28 1991-10-02 Pioneer Electronic Corporation Noise reducing circuit
US6031870A (en) * 1994-11-29 2000-02-29 Gallagher Group Limited Method of electronic control
WO2000038320A1 (en) * 1998-12-22 2000-06-29 Hi-Key Limited A receiver and a variable frequency signal generating circuit for the receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449199A2 (en) * 1990-03-28 1991-10-02 Pioneer Electronic Corporation Noise reducing circuit
US6031870A (en) * 1994-11-29 2000-02-29 Gallagher Group Limited Method of electronic control
WO2000038320A1 (en) * 1998-12-22 2000-06-29 Hi-Key Limited A receiver and a variable frequency signal generating circuit for the receiver

Also Published As

Publication number Publication date
GB0312723D0 (en) 2003-07-09
WO2002054608A1 (en) 2002-07-11
IES20011088A2 (en) 2002-07-10

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)