WO1999057808A9 - Control device for a radio receiver - Google Patents
Control device for a radio receiverInfo
- Publication number
- WO1999057808A9 WO1999057808A9 PCT/GB1999/001352 GB9901352W WO9957808A9 WO 1999057808 A9 WO1999057808 A9 WO 1999057808A9 GB 9901352 W GB9901352 W GB 9901352W WO 9957808 A9 WO9957808 A9 WO 9957808A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- control device
- signal
- target receiver
- noise
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0058—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
Definitions
- This invention relates to a control device for providing signals at a RF target reception frequency.
- Radio Data System RDS
- the radio has to be specially adapted for this purpose.
- An object of the present invention is to provide a control device which can automatically tune an external or auxiliary input signal to the frequency currently being received by a target receiver.
- the invention consists in a control device for using noise from a target receiver to tune an auxiliary signal to the frequency being received by the target receiver.
- the noise may be mixed with a modulated signal bearing the auxiliary signal in order to provide an output signal which contains a component at the target reception frequency.
- invention provides a control device for deducing at least one possible reception frequency of a target receiver, the reception frequency being the frequency to which the target receiver is tuned, and providing signals at said at least one deduced frequency.
- the present invention may be used in combination with many kinds of communication system, and may automatically tune an external or auxiliary input signal to the frequency currently being received by an RF receiver within the communication system. It may interrupt the currently selected RF signal, and allow the RF receiver to receive the incoming signal of interest by converting it to the frequency to which the RF receiver is currently tuned i.e. the target reception frequency. This provides the automatic reception of information without the need to alert the user to the fact that a signal of interest has been sent, and without the need for the user to manually alter any of the tuning states of the receiver to receive the incoming signal.
- the device allows the original RF signal transmission reception to resume. This is particularly useful in the case of a radio receiver in a car.
- the incoming signal such as a telephone call, or information announcement, can be transmitted through the speaker system of the existing car radio.
- the control device operates in combination with a superheterodyne RF receiver in a communication system.
- the control device tunes its transmission frequency to a RF target reception frequency by extrapolation from the currently defined local oscillator frequency of the target superheterodyne RF receiver, as determined by the detection of oscillator noise propagated at the target superheterodyne receiver's antenna input.
- the control device uses the local oscillator frequency to extrapolate the current target RF reception frequency and then tunes the frequency of its transmission signal to the same frequency as that to which the target RF receiver is currently tuned so that the control device's transmission frequency signal can be received by the target RF receiver.
- the control device may be switched between a standby mode and a function mode.
- control device When in a standby mode, the control device may allow the free uninterrupted passage of normal signals from the antenna to the receiver.
- This standby mode may also include continuous or intermittent scanning of the noise on the receiver antenna input, including that from the local oscillator, using the data obtained to deduce the station frequency to which the receiver is currently tuned.
- the control device may detect a transmitted signal at the external or auxiliary signal input, and once detected, mute the antenna signal automatically, and replace the antenna signal with a signal generated by an internal RF modulator at the same frequency as that to which the receiver is tuned, but avoiding transmitting any interference on the antenna.
- the external or auxiliary input signal may be generated by a number of different sources, for example, a PA microphone, an in-vehicle mobile phone, a CB-radio, an in-vehicle intercom, a pager or mobile phone messaging system, a portable computer, a home-security or a child-minding system, an internet e-mail link, or any combination of the foregoing.
- a PA microphone for example, a PA microphone, an in-vehicle mobile phone, a CB-radio, an in-vehicle intercom, a pager or mobile phone messaging system, a portable computer, a home-security or a child-minding system, an internet e-mail link, or any combination of the foregoing.
- the oscillator frequency of the target receiver may be determined by the detection of local oscillator noise propagated at the target receiver's antenna input.
- control device may alternatively or additionally detect a broader range of the noise propagated at the target receiver's antenna input and provide signals at deduced frequencies extrapolated from each noise frequency at which there is a noise signal above a predetermined level.
- the control device arrives at the deduced frequencies by processing each of the deduced frequencies as if it were a noise signal from the local oscillator of the target receiver. In this manner, the control device provides a spectrum of signals, at least one of which is at a frequency to which the receiver is tuned.
- control device may perform a frequency scan to determine what frequencies are being used for broadcast purposes in the locality and provide signals for the target receiver at these deduced frequencies.
- Figure 1 is a diagram illustrating an automatic RF control device
- Figure 2 is a diagram illustrating an automatic RF control device embedded in a telephone and the use thereof with receiver equipment;
- Figure 3 is a diagram illustrating an automatic RF control device adapted for incorporation into a vehicle
- Figure 4 is a diagram illustrating an automatic RF control device which is in wireless communication with an antenna line
- Figure 5 is a diagram illustrating an automatic RF control device incorporating a mixer.
- FIG. 1 shows an automatic RF control device 10 according to the present invention positioned in the antenna signal path 12a, 12b between an RF antenna 14 and a radio or television superheterodyne receiver 16.
- the control device 10 has an auxiliary input 18 for an audio, data and/or video signal for voice, text and/or video insertions, and operates as follows:
- the device of the present invention can, using detector 20, continuously or intermittently scan the RF noise on the receiver antenna input 12b, and deduce the station frequency to which the receiver is tuned at any given time from the frequency being generated by the local oscillator (LO) circuitry of the receiver 16 which is propagated to the receiver antenna input 12b, as a non-utilised, but detectable noise signal.
- LO local oscillator
- the device When an input signal of interest is received at the device auxiliary input 18, the device is switched to an operation mode in which the existing antenna signal is automatically muted, and replaced with a signal generated by an internal RF modulator 22 at the same frequency as the channel to which the receiver 16 is currently tuned, but without transmitting undesirable or illegal interference on the antenna 14. Once the input signal stops, the device switches back to standby mode and, either immediately, or following a pre-defined pause, the original channel frequency reception continues.
- An alternative embodiment of the automatic control device is better adapted to cope with systems in which local oscillator noise propagation is supressed.
- the automatic control device of this embodiment scans the RF noise on the receiver antenna input and determines the frequencies of all noise signals having at least a predetermined amplitude.
- the automatic control device then deduces a possible reception frequency for each noise frequency by treating each noise frequency in turn as if it were the actual local oscillator noise signal.
- auxiliary input 18 of the automatic control device When an input signal of interest is received at the auxiliary input 18 of the automatic control device, it mutes the existing antenna signal and replaces it with signals generated by RF modulator 22 at the spectrum of possible reception frequencies which were deduced from the noise frequencies. It will be appreciated that at least one of the signals in the spectrum will likely be at the frequency to which the target receiver is tuned.
- the control device 60 comprises a modulator 62 which receives the auxiliary signal and which produces a signal onto which the auxiliary signals are modulated.
- the automatic control device 60 further comprises a mixer 64 to which are supplied the modulated signal from modulator 62 and the noise detected from the target receiver.
- the mixer 64 produces, for each component of the target receiver noise, two new modulated frequencies, one of which corresponds to the sum of the two mixed frequencies, and the other corresponding to the difference between them.
- the system is arranged (by preselection of the carrier frequency of modulator 62) such that the signal produced by mixer 64 at the differential frequency of the mixture of the target receiver local oscillator noise frequency and the output of modulator 62 will match the actual reception frequency of the target receiver.
- a spectrum of signals are produced by the control device, one of which is the auxiliary signal modulated at the reception frequency of the target receiver.
- the automatic control device according to this embodiment is simple to implement and avoids intelligent target signal deduction and transmission signal synthesis by simply mixing all the noise signals from the target receiver with a predefined frequency produced by modulator 62.
- a radio one of a particular genre, has an internal reception frequency of 10.7MH_.
- the radio is a superheterodyne receiver and has a local oscillator which produces a signal of adjustable frequency, F L o, which is mixed into incoming radio signals to mix them down to the 10.7MH Z reception "window" of the radio.
- the control device modulates the auxiliary signal (with which it is desired to replace the existing signal received by the radio) on to a 10.7MH Z carrier.
- the modulated signal is then mixed into the noise from the antenna line of the radio and is supplied as an input to the radio (in place of the existing reception signal).
- this new input signal contains a component whose frequency is FL O -10.7 MH Z , i.e. the difference between the radio's local oscillator frequency and the frequency of the auxiliary signal carrier.
- any of the above described embodiments can be supplemented by providing the automatic control device with a memory 24 containing a list of the frequencies of radio stations in the locality.
- the list can be used to test the likelihood of detected noise signals corresponding to the actual frequency to which the target receiver is tuned.
- the list may even be prioritised in accordance with known preferences of the target receiver.
- the automatic control device could also be augmented by a feed-back detection process.
- a test signal could be emitted by the automatic control device and the noise emitted by the target receiver could be analysed by detector 20 for feed back corresponding to the test signal which would indicate that the automatic control device has correctly targeted the receiver.
- the device enables the presentation of an external audio, video and/or data signal over the receiver in, for example, a radio or television, exactly as if the audio, data and/or video message was coming from the selected radio or television station.
- This device also has the advantage that the user can receive transmitted signals without any manual tuning or the need to manually operate any switches or use any hand-held receivers.
- the output from the radio or television channel currently in use is interrupted and replaced with the transmitted signal in audio, video and/or data form.
- the input signal may originate as part of a PA microphone system forming part of an institutional entertainment system, or a commercial information bulletin system. This would allow messages to be delivered over an institutional PA system without the inconvenience of having to switch off an existing broadcast, and manually tune into the PA broadcasting frequency or switching between audio inputs.
- the existing broadcast would merely be interrupted until the PA message was completed, then the original broadcast would resume.
- the automatic RF control device 30 may form part of a 'hands free' module in an in-vehicle mobile telephone 26.
- the control device 30, embedded in the telephone receives signals on its auxiliary input (18, Figure 1) from the sound producing circuit 28 of the telephone 26.
- the automatic control device 30 communicates with the antenna line 32 of the in-vehicle radio 34 by way of line 36, and its is thus capable of replacing the channel presently broadcast by the radio 34 with signals from the telephone 26.
- the driver of the vehicle is able to safely and audibly receive incoming calls without having to stop the vehicle to operate the receiver or to turn off the radio.
- the automatic RF control device When installed in a vehicle, the automatic RF control device can provide the core of an in-vehicle intercom system.
- the audio input from, for example, the front of a vehicle may be output through the radio speakers in the rear of the vehicle by interruption of the radio station currently being broadcast.
- an existing in-vehicle intercom system can be used to form the basis of an embodiment of the invention.
- the automatic RF control device could be used to allow pager or e-mail messages to be audibly presented by interruption of a currently active radio or television channel.
- Another use of the automatic RF control device is as a replacement to traditional car navigation systems employing graphic displays. These systems, since they represent a dangerous distraction to drivers, may well be restricted in their use or made illegal to drivers.
- the automatic RF control device of the present invention makes it possible to adapt any standard PC or PDA with GPS and software to provide requested navigational data for a fraction of the cost of a dedicated system.
- the PC or PDA since the PC or PDA is not a dedicated system, it can also be used for navigating other vehicles and transportation means, such as boats.
- PCs or PDAs typically have sub-standard sound systems with speakers which are inadequate and provide sound that is too quiet or of too poor a quality to be heard in a vehicle over engine and road noise.
- the automatic RF control device not only allows the navigational information to be of improved quality by feeding the sound through the in-vehicle hi-fi speakers, but also allows the user to listen to the radio during a journey and obtain the navigational information at appropriate times without having to adjust the radio, since the system will automatically interrupt the current radio programme during delivery of the navigational information.
- FM RDS-TMC Radio Data System - Traffic Message Channel
- the automatic RF control device can be used in combination with any existing radio anywhere in the world to provide the same programme interruption and message delivery system. In addition, this device is simpler and therefore also cheaper than existing RDS-compatible radios.
- Figure 3 illustrates the provision of the automatic control device 40 in the antenna line built into a vehicle.
- the antenna line 42 leading from the automatic control device 40 may be connected to a radio 44 installed in the facia 46 of a vehicle at production, or later.
- Home-security or child-minding systems could be augmented by the automatic RF control device of the present invention, which would allow any detected audio signal to be displayed remotely as a video, teletext or voice output to alert an operator to potential problems.
- Internet e-mail links could use the automatic RF control device of the present invention to display e-mail messages - or even internet pages - on a TV set as video, teletext or voice.
- the device would have to incorporate video and/or teletext modulator and synthesiser circuitry. It will be appreciated that the automatic control device need not be incorporated in the apparatus providing the auxiliary signals (for example, as shown in Figure 2).
- the automatic control device and the apparatus providing the auxiliary signals for the control device could be arranged to communicate wirelessly to transfer the auxiliary signals to the automatic control device.
- the wireless communication could be effected using a low cost, short range, low power, relatively high frequency link such as the "Bluetooth" system.
- a further application of the automatic RF control device of the present invention would involve placing the device near the antenna path, rather than in the antenna path, of the target superheterodyne receiver. This would allow remote detection of the local oscillator noise signal, thereby allowing the transmission of a signal, at a frequency to which the target receiver is currently tuned, from a remote transmitter.
- Figure 4 illustrates a control device 50 similar to that described with reference to Figure 1 but inductively coupled 52 to the antenna line 54.
- This system could be used, for example, at night in built-up areas where loud siren noise may be undesirable, by police in cars.
- the police car could drive alongside a target vehicle and transmit an audio signal, interrupting their radio reception, and request them to stop their car.
- this system could be used by emergency services to request motorists, who may not have heard the approaching emergency vehicle if they had their car radio playing at a high volume, to move aside to let them through.
- Another use may be in car parks, where motorists about to park their vehicles could be transmitted a message, for example, warning them of the consequences of unauthorised parking, or reminding them to buy a parking voucher. Talking traffic and road signs of all kinds could employ the system, as well as road-side advertising transmitters.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020007012178A KR20010052294A (en) | 1998-05-01 | 1999-04-30 | Control device for a radio receiver |
AU37214/99A AU3721499A (en) | 1998-05-01 | 1999-04-30 | Control device for a radio receiver |
IL13939599A IL139395A0 (en) | 1998-05-01 | 1999-04-30 | Control device for a radio receiver |
JP2000547696A JP2002514029A (en) | 1998-05-01 | 1999-04-30 | Control device for wireless receiver |
CA002330638A CA2330638A1 (en) | 1998-05-01 | 1999-04-30 | Control device for a radio receiver |
EP99919420A EP1099305A1 (en) | 1998-05-01 | 1999-04-30 | Control device for a radio receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9809437.8 | 1998-05-01 | ||
GBGB9809437.8A GB9809437D0 (en) | 1998-05-01 | 1998-05-01 | Automatic radio frequency control device |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999057808A1 WO1999057808A1 (en) | 1999-11-11 |
WO1999057808A9 true WO1999057808A9 (en) | 2000-02-24 |
Family
ID=10831379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/001352 WO1999057808A1 (en) | 1998-05-01 | 1999-04-30 | Control device for a radio receiver |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1099305A1 (en) |
JP (1) | JP2002514029A (en) |
KR (1) | KR20010052294A (en) |
CN (1) | CN1306695A (en) |
AU (1) | AU3721499A (en) |
CA (1) | CA2330638A1 (en) |
GB (1) | GB9809437D0 (en) |
IL (1) | IL139395A0 (en) |
WO (1) | WO1999057808A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5404161A (en) * | 1993-07-27 | 1995-04-04 | Information Resources, Inc. | Tuned signal detector for use with a radio frequency receiver |
US5689822A (en) * | 1995-02-17 | 1997-11-18 | Zucker; Leo | Wireless coupled adapter for decoding information from a broadcast signal to which a radio is tuned |
-
1998
- 1998-05-01 GB GBGB9809437.8A patent/GB9809437D0/en not_active Ceased
-
1999
- 1999-04-30 JP JP2000547696A patent/JP2002514029A/en active Pending
- 1999-04-30 EP EP99919420A patent/EP1099305A1/en not_active Withdrawn
- 1999-04-30 AU AU37214/99A patent/AU3721499A/en not_active Abandoned
- 1999-04-30 KR KR1020007012178A patent/KR20010052294A/en not_active Application Discontinuation
- 1999-04-30 IL IL13939599A patent/IL139395A0/en unknown
- 1999-04-30 WO PCT/GB1999/001352 patent/WO1999057808A1/en not_active Application Discontinuation
- 1999-04-30 CA CA002330638A patent/CA2330638A1/en not_active Abandoned
- 1999-04-30 CN CN99807562A patent/CN1306695A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP1099305A1 (en) | 2001-05-16 |
WO1999057808A1 (en) | 1999-11-11 |
KR20010052294A (en) | 2001-06-25 |
AU3721499A (en) | 1999-11-23 |
CA2330638A1 (en) | 1999-11-11 |
CN1306695A (en) | 2001-08-01 |
IL139395A0 (en) | 2001-11-25 |
GB9809437D0 (en) | 1998-07-01 |
JP2002514029A (en) | 2002-05-14 |
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