EP0082347A1 - Circuit pour le transfert de signaux infrarouges modulés d'impulsions à intervalles pour des dispositifs à commande à distance - Google Patents

Circuit pour le transfert de signaux infrarouges modulés d'impulsions à intervalles pour des dispositifs à commande à distance Download PDF

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Publication number
EP0082347A1
EP0082347A1 EP19820110920 EP82110920A EP0082347A1 EP 0082347 A1 EP0082347 A1 EP 0082347A1 EP 19820110920 EP19820110920 EP 19820110920 EP 82110920 A EP82110920 A EP 82110920A EP 0082347 A1 EP0082347 A1 EP 0082347A1
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EP
European Patent Office
Prior art keywords
signals
phase
pulse
locked loop
pll
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Withdrawn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
EP19820110920
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German (de)
English (en)
Inventor
Herbert Dipl.-Ing. Hafner
Hans Pollinger
Dieter Tank
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.)
Wilhelm Ruf KG
Original Assignee
Wilhelm Ruf KG
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 Wilhelm Ruf KG filed Critical Wilhelm Ruf KG
Publication of EP0082347A1 publication Critical patent/EP0082347A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/28—Electric signal transmission systems in which transmission is by pulses using pulse code
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared

Definitions

  • the invention relates to a circuit arrangement for the transmission of pulse-distance-modulated infrared signals for remote control devices, with a transmitter that emits the infrared signals and with a receiver that has an infrared-sensitive element, a preamplifier connected to it and a decoder for pulse Has distance-modulated signals.
  • Such a circuit arrangement can be found in data sheets from Plessey Semiconductors, where with a remote control transmitter of the type SL 490, an infrared receiver preamplifier of the type SL 480 and a remote control receiver of types NL 928/9 or NL 920 the circuit arrangement described at the beginning is buildable.
  • a circuit arrangement Vietnamese is also known from an article by Rüdiger Karnatzki, "Infrared remote control with 1024 commands", Funkschau 1978, Issue 8, pages 323 to 326.
  • the transmitter only broadcasts bit changes within the same word. Successive equivalent bits are suppressed by the transmitter and automatically added in the receiver.
  • the basic principle of coding is frequency shift keying. However, since successive equivalent bits are suppressed, precisely defined "time windows" must be provided in order to be able to mask out interference pulses. In other words, only signals of frequencies F 1 or F 2 received within these time windows are evaluated. To detect the two frequencies F 1 and F 2 , PLL circuits are available which act as very narrow-band filters.
  • the digital information is contained in pauses of different lengths between two marking pulses. For example, a long pause corresponds to 0, while a short pause corresponds to l.
  • the digital information is contained in the phase position of the pulses relative to a start pulse.
  • frequency-hopping coding also generally referred to as fsk; frequency shift keying
  • the digital information is contained in the hops between two discrete frequencies. For example, a frequency jump from a frequency f to a frequency f l corresponds to the binary value 0, while a return, ie a jump from the frequency f 1 to the frequency f 0 corresponds to the digital value 1.
  • the other general class of infrared remote control systems relates to frequency modulated systems in which the information is contained in the selection of a specific frequency from a number of possible frequencies.
  • the systems using pulse modulation have the advantage of an almost unlimited number of characters, ie almost unlimited coding possibilities.
  • the character or command set is in principle only limited by the transmission duration.
  • a disadvantage of these systems is that that during the entire transmission time of a "command word", which consists, for example, of a start bit and 6 information bits, the signal must be transmitted correctly, ie with a sufficient signal / signal-to-noise ratio.
  • the FSK system provides an improvement, where the signal / signal-to-noise ratio can be improved using narrow-band filters.
  • So-called phase-locked loops or phase-locked loops (generally also referred to as PLL) have also been used as narrow-band filters.
  • An excellent signal-to-noise ratio is obtained by using two PLLs, each of which is tuned to one of the two frequencies f and f 1 .
  • a disadvantage of this, however, is that the transmitter must remain switched on continuously during the transmission of a command word, since it must continuously transmit one of the two frequencies. In this way, in the case of a remote control, current is drawn from the battery for the entire duration of the command word transmission, so that it must be replaced after a short time.
  • the transmission power for infrared light emitting diodes cannot be very high due to the thermal load, which again increases the range is bordered.
  • Another disadvantage of this system is that the two operating frequencies must be relatively far apart, since the PLLs have to "lock" onto the respective signal relatively quickly, which can only take place if the bandwidth of the individual PLLs is relatively large. As a result, the entire bandwidth of a transmission channel is again relatively large, so that only a few “channels” with different frequencies are available within the infrared range.
  • the frequency-modulated systems have the main advantage that they only require a small signal / signal-to-noise ratio.
  • the structural complexity of these systems is relatively large, since a separate channel is required for each “command”.
  • the present invention aims to overcome the disadvantages of the systems described above.
  • the object of the present invention is therefore to improve the circuit arrangement of the type mentioned at the outset in such a way that digital information with a large number of characters can be transmitted over long infrared distances and faulty transmissions are effectively suppressed by interference signals.
  • the present invention thus combines the advantages of amplitude-pulse coding with frequency coding without, however, accepting the respective disadvantages.
  • the transmission power can be reduced, which extends the battery life in battery-operated transmitters.
  • the PLL is supplied with a narrowband input signal, which has the advantage that very narrowband preamplifiers can be used. In this way a good "preselection" can already be carried out so that harmonic frequencies of other channels do not result in interference.
  • the individual frequencies can also be integer multiples of a common fundamental frequency.
  • a transmitter 1 which generates pulse-distance-modulated signals with which a carrier frequency f 0 is amplitude-modulated.
  • This electrical signal is converted via a light-emitting component 2, which can be, for example, a light-emitting diode (LED), into an optical signal, which is indicated by the arrow 3 and which is in the infrared range.
  • This signal is transmitted via an “infrared link” and received in a receiver by an infrared-sensitive component 4, such as an infrared detector, and converted into an electrical signal.
  • the output of the infrared-sensitive component 4 leads via a filter circuit comprising a choke 5 and a capacitor 6 to an unregulated, narrow-band preamplifier 7, which can also be designed as a multi-stage, eg 3-stage amplifier.
  • an already narrow-band signal U 7 appears, which is shown in FIG. 2 for a possible pulse sequence. There you can also see that this signal is still with star no malfunctions. In addition, a strong "noise" can also be superimposed on this signal.
  • the output signal of the preamplifier 7 is then fed to the input of a phase-locked loop 8, which is also generally referred to as "PLL".
  • the output of the PLL 8 is connected to a PCM decoder 9, at the outputs 19 of which - depending on the pulse train received - the corresponding "control commands" appear.
  • the catch range or the catch duration of the PLL is set such that it is synchronized with the input signal after about 10 to 50 oscillations of the input signal.
  • a second output of the voltage-controlled oscillator which, after the transient has settled, carries a signal which is synchronous but out of phase with the input signal of the PLL, is connected to an input of a second phase detector 14 via a 90 ° phase shifter 13.
  • the output of the preamplifier 7 is fed to the other input of the phase detector 14.
  • the phase detector 14 thus generates at its output a voltage with a DC voltage component which is superimposed by AC voltage components.
  • Noise signals or noise voltages of the output signal of the preamplifier 7 can be thought of as a composition of stochastically distributed individual frequencies which do not produce a DC voltage component at the output of the phase detector 14 since they are compensated in the linear phase detector 14 because they have no relation to the frequency of the voltage-controlled oscillator 10 stand.
  • the PLL is thus able to filter out useful signals from the noise that are up to 6 dB below the input noise level.
  • the output signals of the phase detector 14 are smoothed in a low-pass filter 15, which has the task of suppressing the AC voltage component mentioned above.
  • the output voltage of the phase detector 14 thus freed from the AC voltage components is now compared in a comparator 16 with a reference voltage U re f that comes from a voltage source 17 (not shown in more detail).
  • the comparator 16 then only outputs an output signal to the line 18 when the DC voltage signal from the low pass 15 is greater than the reference voltage U ref . This only happens if the output signals of the preamplifier 7 are within the PLL's capture range, while interference pulses or interference signals outside the PLL's capture range are suppressed.
  • the output signal of the comparator 18, which represents the output signal of the PLL 8, is shown in FIG. 3 with reference to the pulse pattern shown in FIG. 2.
  • This signal which is freed from noise components and interference peaks, is then decoded in a conventional pulse-distance modulation decoder 9, which converts the pulse-distance-modulated signal into binary parallel signals that appear on the lines 19.
  • the signals on the lines 19 are then - depending on the application - connected to the individual actuators, switches etc. which are to carry out the desired remote-controlled commands.
  • Component SL 490 from Plessey Semiconductor is suitable for transmitter 1.
  • the ML 920 or ML 928/9 from Plessey Semiconductor is suitable for the receiver.
  • the component SL 480 from Plessey Semiconductor is suitable for the infrared preamplifier.
  • the present invention combines the advantages of pulse spacing modulation, i.e. large command set with the interference immunity of frequency-modulated systems, i.e. good interference immunity.
  • a remote control can thus be set up with the circuit arrangement of the present invention, which can transmit infrared signals over long distances in a fail-safe manner with low energy requirements.
  • the PLL in conjunction with the narrow-band preamplifier also makes it possible to create several “channels” that have a relatively small frequency spacing from one another. Since the preamplifier can be designed to be very narrow-band, there is also no danger that the PLL will be harmonic or subharmonic
  • Vibrations of adjacent channels respond. This means that several devices can be remotely controlled in one room.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Communication System (AREA)
EP19820110920 1981-12-18 1982-11-25 Circuit pour le transfert de signaux infrarouges modulés d'impulsions à intervalles pour des dispositifs à commande à distance Withdrawn EP0082347A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3150347 1981-12-18
DE19813150347 DE3150347A1 (de) 1981-12-18 1981-12-18 Schaltungsanordnung zur uebertragung von puls-abstandmodulierten infrarotsignalen fuer fernsteuergeraete

Publications (1)

Publication Number Publication Date
EP0082347A1 true EP0082347A1 (fr) 1983-06-29

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Application Number Title Priority Date Filing Date
EP19820110920 Withdrawn EP0082347A1 (fr) 1981-12-18 1982-11-25 Circuit pour le transfert de signaux infrarouges modulés d'impulsions à intervalles pour des dispositifs à commande à distance

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EP (1) EP0082347A1 (fr)
DE (1) DE3150347A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186248A1 (fr) * 1984-12-28 1986-07-02 La Radiotechnique Portenseigne Dispositif récepteur de télécommande utilisant une onde porteuse modulée
EP0367333A1 (fr) * 1988-10-31 1990-05-09 Koninklijke Philips Electronics N.V. Récepteur de télécommande à retour d'énergie à la batterie

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3333611A1 (de) * 1983-09-15 1985-04-04 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur uebertragung binaer kodierter daten
DE10220723B4 (de) * 2002-05-10 2005-07-28 Diehl Ako Stiftung & Co. Kg Verfahren zur drahtlosen Datenübertragung
CN112213977A (zh) * 2020-10-10 2021-01-12 东莞永冠电子科技有限公司 一种抗干扰红外感应电路

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2361839B2 (de) * 1972-12-13 1979-09-06 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) Proportional-Fernsteuersystem

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2361839B2 (de) * 1972-12-13 1979-09-06 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) Proportional-Fernsteuersystem

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186248A1 (fr) * 1984-12-28 1986-07-02 La Radiotechnique Portenseigne Dispositif récepteur de télécommande utilisant une onde porteuse modulée
FR2575573A1 (fr) * 1984-12-28 1986-07-04 Radiotechnique Dispositif recepteur de telecommande utilisant une onde porteuse modulee
EP0367333A1 (fr) * 1988-10-31 1990-05-09 Koninklijke Philips Electronics N.V. Récepteur de télécommande à retour d'énergie à la batterie

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DE3150347A1 (de) 1983-07-14

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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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Inventor name: HAFNER, HERBERT, DIPL.-ING.

Inventor name: POLLINGER, HANS

Inventor name: TANK, DIETER