EP0012021A1 - Radio receiver - Google Patents

Radio receiver Download PDF

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Publication number
EP0012021A1
EP0012021A1 EP79302731A EP79302731A EP0012021A1 EP 0012021 A1 EP0012021 A1 EP 0012021A1 EP 79302731 A EP79302731 A EP 79302731A EP 79302731 A EP79302731 A EP 79302731A EP 0012021 A1 EP0012021 A1 EP 0012021A1
Authority
EP
European Patent Office
Prior art keywords
frequency
radio
signal
amplifier
signals
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Withdrawn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
EP79302731A
Other languages
German (de)
French (fr)
Inventor
Stephen Charles Taylor
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.)
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
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 Ford Werke GmbH, Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Werke GmbH
Publication of EP0012021A1 publication Critical patent/EP0012021A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • G08G1/094—Hardware aspects; Signal processing or signal properties, e.g. frequency bands

Definitions

  • This invention relates to radio receivers.
  • a conventional radio receiver comprises a radio frequency amplifier which is arranged to amplify transmitted radio frequency signals of a selected frequency detected by an aerial; an oscillator for producing an oscillator signal of a frequency differing from the frequency of the selected radio frequency signal by a predetermined amount; a mixer for mixing the oscillator signal with the radio frequency signal to produce an intermediate frequency signal derived from the radio frequency amplifier; an intermediate frequency amplifier for amplifying the said intermediate frequency signal; and a detector for producing an audio frequency signal from the amplified intermediate frequency signal.
  • the radio receiver In order to avoid interference between transmitted radio frequency signals and the intermediate frequency signals, the radio receiver must be tuned to produce an intermediate frequency signal different from any transmitted radio signals. Under international agreements, broadcasting authorities refrain from broadcasting on selected radio frequencies so that these frequencies can be used by radio manufacturers as the intermediate frequency of the radio receiver. Thus, for example, in the United Kingdom, all radio receivers operate on an intermediate frequency signal of 465 kHZ.
  • the radio frequency amplifier In such radio receivers, the radio frequency amplifier must be re tuned to a different frequency when it is desired to receive a transmission by a different broadcasting station.
  • a driver In a motor vehicle, a driver may be compelled to re-tune the receiver several times during a long journey, particularly if he wishes to obtain such information as local weather or traffic conditions which would be broadcast only on ehort-range radio transmitters.
  • An object of the prsaant invention is therefore to provide a radio receiver which becomes automatically switched to receive a transmission on a desired radio fre- quancy in response to a predetermined radio frequency signal on that fre- quancy
  • a radio receiver comprising a radio-frequency amplifier for amplifying transmitted radio-frequency signals of a selected frequency detected by an aerial; an oscillator for producing an oscillator signal of a frequency differing from the frequency of the selected radio-frequency signals by a predetermined amount; a mixer for mixing the oscillator signal with the radio-frequency signal to produce an intermediate-frequency signal derived from the radio frequency amplifier; an intermediate-frequency amplifier for amplifying the signal from the mixer; and a detector for producing audio-frequency signals from the amplified signal from the mixer; characterised in that the intermediate-frequency amplifier is arranged to amplify transmitted radio-frequency signals at the intermediate frequency which have not been amplified by the radio frequency amplifier, and in that means is provided for stopping and starting the supply of intermediate frequency signals derived from the radio-frequency amplifier to the intermediate-frequency amplifier in response to a predetermined radio frequency signal transmitted at the intermediate frequency.
  • the radio receiver By arranging for the intermediate frequency amplifier to be tuned to the frequency on which the predetermined radio frequency signal is broadcast, rather than the frequency conventionally used in the intermediate stage of a radio receiver, the radio receiver will become automatically tuned to receive the broadcast on that frequency when the predetermined signal is broadcast.
  • the detector is operable in response to the predetermined radio frequency signal to generate a signal pulse which stops or starts the oscillator.
  • the oscillator may be associated with a bi-stable switch which receives the signal pulse from the detector and operates to switch the oscillator on and off in response to successive signal pulses.
  • the intermediate frequency amplifier is arranged to receive signals detected by the aerial at the intermediate frequency by means of a circuit which by-passes the radio frequency amplifier. Desirably, the signals passed along the by-pass circuit are fed to the intermediate frequency amplifier.
  • the radio receiver shown in the drawing is intended for use in receiving short-range radio transmissions of short duration, e.g. local weather and traffic resports and which are broadcast on a single radio channel. These broadcasts will be preceded by a signal code which is used to effect automatic tuning of the radio receiver to that channel at the start of each transmission. Each transmission is also followed by a further signal code which is used to effect automatic re-tuning of the radio receiver to the original radio channel, when the transmission terminates.
  • the signal codes are in the form of multiplexed radio frequency signals capable of separation from the main broadcast signal in a decoding circuit.
  • the radio receiver comprises a radio-frequency amplifier 1 which is connected to a socket connection 2, which is in turn connected to an aerial 3.
  • the radio frequency amplifier 1 which is of conventional construction, is capable of being tuned by a manual control (not shown) to amplify transmitted radio frequency signals detected by the aerial 3.
  • the amplified signals are fed to a mixer circuit 4, also of conventional construction, which mixes the amplified signals with a signal from an oscillator circuit 4.
  • the oscillator circuit 5 is coupled with the radio frequency amplifier 1 to generate signals which always differ in frequency by a predetermined amount from the signals to which the amplifier 1 but which has a frequency equal to the difference between the frequencies to which the amplifier 1 and the oscillator 5 are tuned.
  • Signals from the mixer 4 are fed to an intermediate frequency amplifier 10 which is tuned to the frequency difference to the radio frequency amplifier 1 and the oscillator 5.
  • the amplified signals are then fed to a detector circuit 11 which demodulates the intermediate frequency signals and produces an audio frequency signal which is fed to an audio frequency amplifier 12.
  • the amplified audio frequency signal is then reproduced audibly in a loudspeaker 14.
  • a by-pass circuit 8 couples the socket 2 with the intermediate frequency amplifier 10 via a switch 9. When the switch 9 is closed, signals from the aerial 3 ar ⁇ passed directly to the intermediate amplifier 4 without amplification by the radio frequency amplifier 1 .
  • the detector circuit 11 is also arranged to generate signal pulses in response to a predetermined radio frequency signal.
  • the signal pulses are used to operate a switch circuit 15 which alternately stops and starts the oscillator 5.
  • the detector 11 may include a conventional decoding circuit which directs signals of a predetermined characteristic to the switch circuit 15 rather than to the audio frequency amplifier 12, and the switch circuit 15 may be in the form of a conventional bi-stable circuit or flip-flop which operates in response to successive signals from the detector 11.
  • the radio receiver In use, when the switch 9 is open and the oscillator 5 is on, the radio receiver operates in the same way as a conventional superheterodyne receiver.
  • the amplifier 1 is tuned to a frequency corresponding to a desired radio broadcasting channel. Transmitted signals at that frequency are detected by the aerial, amplified in the radio frequency amplifier and the amplified signals mixed with the signals generated by the oscillator 5.
  • the signals produced in the mixer 4 will have a frequency equal to the difference in the frequencies to which the oscillator 5 and amplifier 1 are tuned. Unlike conventional radio re- 1976, this frequency difference is set to the frequency of local radio transmissions (e.g. 526.5 kHZ) rather than the conventional intermediate frequency setting (e.g. 465 k HZ).
  • the intermediate frequency signal is then amplified in the amplifier 10, and demodulated in the detector 11 and the resulting audio frequency signal is amplified and reproduced in the amplifier 12 and loudspeaker 14.
  • the receiver With the switch 9 closed, the receiver continues to operate in the manner described above until a signal code is detected by the aerial 3, this signal code being transmitted at the frequency to which the intermediate amplifier is tuned.
  • the signal code which will normally be at a different frequency from that to which the amplifier 1 is tuned, by-passes the amplifier 1 and is amplified directly by the intermediate frequency amplifier 10.
  • the detector 11 then generates a signal pulse which is derived from the amplified radio signal code and this pulse is used to stop the oscillator 5. Thereafter, the radio signals at the frequency which the amplifier 1 is tuned are no longer converted to the intermediate frequency by the mixer 4 so that the signals produced by the amplifier are derived solely from those transmitted at the intermediate frequency.
  • a further signal pulse is derived from this signal code by the detector 11, and is passed to the switch 15 circuit which reactivates the oscillator 5 thereby permitting the receiver to continue reproduction of the signals broadcast at the frequency to which the amplifier 1 is tuned.
  • the precise construction of the switch circuit 15 will depend upon the nature of the signal pulses broadcast before and after each transmission.
  • a suitable switch circuit is described for broadcasts in which the substance of the broadcast is transmitted in amplitude- modulated signals, and the signal pulses are in the form of frequency- modulated signals of two different frequencies.
  • the signal pulses are detected by a frequency modulation discriminator, the output of which is fed to two filters each tuned respectively to the frequency of the signal used at the beginning and end of the broadcast.
  • the filters are in turn connected to opposite inputs of a bistable latch which can then be used to operate a switch, as indicated above.

Abstract

A radio receiver comprising a radio-frequency amplifier (1) for amplifying transmitted radio-frequency signals of a selected frequency detected by an aerial (3); an oscillator (5) for producing an oscillator signal of a frequency differing from the frequency of the selected radio-frequency signals; a mixer (4) for mixing the oxcillator signal with the radio-frequency signal to produce an intermediate-frequency signal; an intermediate-frequency amplifier (10) for amplifying the signal from the mixer (4); and a detector (11) for producing audio-frequency signals from the amplified signal from the mixer (4); the intermediate-frequency amplifier (10) Is arranged to amplify transmitted radio-frequency signals at the intermediate frequency which have not been amplified by the radio frequency amplifier (1), and in that means is provided for stopping and starting the supply of intermediate-frequency signals derived form the radio-frequency amplifier (1) to the intermediate-frequency amplifier (10) in response to a predetermined radio-frequency signal transmitted at the intermediate frequency.

Description

  • This invention relates to radio receivers.
  • A conventional radio receiver comprises a radio frequency amplifier which is arranged to amplify transmitted radio frequency signals of a selected frequency detected by an aerial; an oscillator for producing an oscillator signal of a frequency differing from the frequency of the selected radio frequency signal by a predetermined amount; a mixer for mixing the oscillator signal with the radio frequency signal to produce an intermediate frequency signal derived from the radio frequency amplifier; an intermediate frequency amplifier for amplifying the said intermediate frequency signal; and a detector for producing an audio frequency signal from the amplified intermediate frequency signal.
  • In order to avoid interference between transmitted radio frequency signals and the intermediate frequency signals, the radio receiver must be tuned to produce an intermediate frequency signal different from any transmitted radio signals. Under international agreements, broadcasting authorities refrain from broadcasting on selected radio frequencies so that these frequencies can be used by radio manufacturers as the intermediate frequency of the radio receiver. Thus, for example, in the United Kingdom, all radio receivers operate on an intermediate frequency signal of 465 kHZ.
  • In such radio receivers, the radio frequency amplifier must be re tuned to a different frequency when it is desired to receive a transmission by a different broadcasting station. In a motor vehicle, a driver may be compelled to re-tune the receiver several times during a long journey, particularly if he wishes to obtain such information as local weather or traffic conditions which would be broadcast only on ehort-range radio transmitters.
  • In a broadcasting system described in "Wireless World", January 1971 pp 78, transmissions from short-range transmitters relating to purely local information would all be broadcast on a single radio frequency, e.g. 526.5 kHZ, so that the driver of a vehicle could receive local information without re-tuning the radio receiver during his journey. Each broadcast would commence and terminate with a signal which could be used to trigger a suitable switching circuit within a receiver so that the receiver would automatically switch itself to the frequency on which the local information as being broadcast. An object of the prsaant invention is therefore to provide a radio receiver which becomes automatically switched to receive a transmission on a desired radio fre- quancy in response to a predetermined radio frequency signal on that fre- quancy
  • According to the present invention, we provide a radio receiver comprising a radio-frequency amplifier for amplifying transmitted radio-frequency signals of a selected frequency detected by an aerial; an oscillator for producing an oscillator signal of a frequency differing from the frequency of the selected radio-frequency signals by a predetermined amount; a mixer for mixing the oscillator signal with the radio-frequency signal to produce an intermediate-frequency signal derived from the radio frequency amplifier; an intermediate-frequency amplifier for amplifying the signal from the mixer; and a detector for producing audio-frequency signals from the amplified signal from the mixer; characterised in that the intermediate-frequency amplifier is arranged to amplify transmitted radio-frequency signals at the intermediate frequency which have not been amplified by the radio frequency amplifier, and in that means is provided for stopping and starting the supply of intermediate frequency signals derived from the radio-frequency amplifier to the intermediate-frequency amplifier in response to a predetermined radio frequency signal transmitted at the intermediate frequency.
  • By arranging for the intermediate frequency amplifier to be tuned to the frequency on which the predetermined radio frequency signal is broadcast, rather than the frequency conventionally used in the intermediate stage of a radio receiver, the radio receiver will become automatically tuned to receive the broadcast on that frequency when the predetermined signal is broadcast.
  • Preferably, the detector is operable in response to the predetermined radio frequency signal to generate a signal pulse which stops or starts the oscillator. For example, the oscillator may be associated with a bi-stable switch which receives the signal pulse from the detector and operates to switch the oscillator on and off in response to successive signal pulses.
  • In the preferred embodiment of the invention, the intermediate frequency amplifier is arranged to receive signals detected by the aerial at the intermediate frequency by means of a circuit which by-passes the radio frequency amplifier. Desirably, the signals passed along the by-pass circuit are fed to the intermediate frequency amplifier.
  • A preferred embodiment of the invention will now be described, by way of example only, with reference to the drawing which is a block diagram of a radio receiver in accordance with the invention.
  • The radio receiver shown in the drawing is intended for use in receiving short-range radio transmissions of short duration, e.g. local weather and traffic resports and which are broadcast on a single radio channel. These broadcasts will be preceded by a signal code which is used to effect automatic tuning of the radio receiver to that channel at the start of each transmission. Each transmission is also followed by a further signal code which is used to effect automatic re-tuning of the radio receiver to the original radio channel, when the transmission terminates. The signal codes are in the form of multiplexed radio frequency signals capable of separation from the main broadcast signal in a decoding circuit.
  • Referring to the drawing, the radio receiver comprises a radio-frequency amplifier 1 which is connected to a socket connection 2, which is in turn connected to an aerial 3. The radio frequency amplifier 1, which is of conventional construction, is capable of being tuned by a manual control (not shown) to amplify transmitted radio frequency signals detected by the aerial 3. The amplified signals are fed to a mixer circuit 4, also of conventional construction, which mixes the amplified signals with a signal from an oscillator circuit 4. As indicated by a broken line in the drawing, the oscillator circuit 5 is coupled with the radio frequency amplifier 1 to generate signals which always differ in frequency by a predetermined amount from the signals to which the amplifier 1 but which has a frequency equal to the difference between the frequencies to which the amplifier 1 and the oscillator 5 are tuned. Signals from the mixer 4 are fed to an intermediate frequency amplifier 10 which is tuned to the frequency difference to the radio frequency amplifier 1 and the oscillator 5. The amplified signals are then fed to a detector circuit 11 which demodulates the intermediate frequency signals and produces an audio frequency signal which is fed to an audio frequency amplifier 12. The amplified audio frequency signal is then reproduced audibly in a loudspeaker 14.
  • A by-pass circuit 8 couples the socket 2 with the intermediate frequency amplifier 10 via a switch 9. When the switch 9 is closed, signals from the aerial 3 ar^ passed directly to the intermediate amplifier 4 without amplification by the radio frequency amplifier 1.
  • The detector circuit 11 is also arranged to generate signal pulses in response to a predetermined radio frequency signal. The signal pulses are used to operate a switch circuit 15 which alternately stops and starts the oscillator 5. Thus, for example, the detector 11 may include a conventional decoding circuit which directs signals of a predetermined characteristic to the switch circuit 15 rather than to the audio frequency amplifier 12, and the switch circuit 15 may be in the form of a conventional bi-stable circuit or flip-flop which operates in response to successive signals from the detector 11.
  • In use, when the switch 9 is open and the oscillator 5 is on, the radio receiver operates in the same way as a conventional superheterodyne receiver. Thus, the amplifier 1 is tuned to a frequency corresponding to a desired radio broadcasting channel. Transmitted signals at that frequency are detected by the aerial, amplified in the radio frequency amplifier and the amplified signals mixed with the signals generated by the oscillator 5. The signals produced in the mixer 4 will have a frequency equal to the difference in the frequencies to which the oscillator 5 and amplifier 1 are tuned. Unlike conventional radio re- ceivershowever, this frequency difference is set to the frequency of local radio transmissions (e.g. 526.5 kHZ) rather than the conventional intermediate frequency setting (e.g. 465 k HZ). The intermediate frequency signal is then amplified in the amplifier 10, and demodulated in the detector 11 and the resulting audio frequency signal is amplified and reproduced in the amplifier 12 and loudspeaker 14.
  • With the switch 9 closed, the receiver continues to operate in the manner described above until a signal code is detected by the aerial 3, this signal code being transmitted at the frequency to which the intermediate amplifier is tuned. The signal code, which will normally be at a different frequency from that to which the amplifier 1 is tuned, by-passes the amplifier 1 and is amplified directly by the intermediate frequency amplifier 10. The detector 11 then generates a signal pulse which is derived from the amplified radio signal code and this pulse is used to stop the oscillator 5. Thereafter, the radio signals at the frequency which the amplifier 1 is tuned are no longer converted to the intermediate frequency by the mixer 4 so that the signals produced by the amplifier are derived solely from those transmitted at the intermediate frequency. These signals are demodulated by the detector 11 and fed to the audo frequency amplifier 12 for reproduction in the loudspeaker 14. As a result, the transmission at the intermediate frequency will be received and reproduced by the radio receiver regardless of the frequency to which the amplifier 1 is tuned.
  • When the transmission at the intermediate frequency ends, a further signal code is broadcast. A further signal pulse is derived from this signal code by the detector 11, and is passed to the switch 15 circuit which reactivates the oscillator 5 thereby permitting the receiver to continue reproduction of the signals broadcast at the frequency to which the amplifier 1 is tuned.
  • It will be appreciated that the precise construction of the switch circuit 15 will depend upon the nature of the signal pulses broadcast before and after each transmission. In the above-mentioned article in "Wireless World", a suitable switch circuit is described for broadcasts in which the substance of the broadcast is transmitted in amplitude- modulated signals, and the signal pulses are in the form of frequency- modulated signals of two different frequencies. The signal pulses are detected by a frequency modulation discriminator, the output of which is fed to two filters each tuned respectively to the frequency of the signal used at the beginning and end of the broadcast. The filters are in turn connected to opposite inputs of a bistable latch which can then be used to operate a switch, as indicated above.

Claims (4)

1. A radio receiver comprising a radio-frequency amplifier For amplilying trenmited radio-frequency signals of a selected frequency detected by an serial; an csillator for prodicing an oscillator signal of a frequency differing from the frequency of the selected radio-frequency signals by a predetermined amount; a mixer for mixing the oscillator signal with the radio-frequency signal to produce an intermediate-frequency signal derived from the radio frequency amplifier; an intermediate-frequency amplifier for amplifying the signal from the mixer; and a detector for producing audio-frequency signals from the amplified signal from the mixer; characterised in that the intermediate-frequency amplifier is arrange. to amplify transmitted radio-frequency signals at the intermediate frequency which have not been amplified by the radio frequency amplifier, and in that means is provided for stopping and starting the supply of intermediate-frequency signals derived from the radio-frequency amplifier to the intermediate-frequency amplifier in response to a predetermined radio frequency signal transmitted at the intermediate frequency.
2. A' radio receiver according to Claim 1 wherein the detector is operable in response to the predetermined radio frequency signal to generate a signal pulse which stops or starts the oscillator.
3. A radio receiver according to Claim 1 or Claim 2 wherein the intermediate frequency amplifier is arranged to receive signals detected by the aerial at the intermediate frequency by means of a switched circuit which by-passes the radio frequency amplifier
4. A radio receiver substantially as hereinbefore described with reference to the drawing.
EP79302731A 1978-12-01 1979-11-30 Radio receiver Withdrawn EP0012021A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7846955 1978-12-01
GB7846955 1978-12-01

Publications (1)

Publication Number Publication Date
EP0012021A1 true EP0012021A1 (en) 1980-06-11

Family

ID=10501486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302731A Withdrawn EP0012021A1 (en) 1978-12-01 1979-11-30 Radio receiver

Country Status (1)

Country Link
EP (1) EP0012021A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252764B (en) * 1967-10-26
GB1359356A (en) * 1970-09-14 1974-07-10 Int Standard Electric Corp Broadcast systems and receivers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252764B (en) * 1967-10-26
GB1359356A (en) * 1970-09-14 1974-07-10 Int Standard Electric Corp Broadcast systems and receivers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OTTO LIMANN " Funktechnik ohne Ballast ", 13.,unver{nderte Auflage, 1975, FRANZIS-VERLAG MUNCHEN, pages 214 and 215 * Bild 12. 17 * *

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: FORD-WERKE AKTIENGESELLSCHAFT

Owner name: FORD MOTOR COMPANY LIMITED

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Inventor name: TAYLOR, STEPHEN CHARLES