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WO2005079113A2 - Systeme de detection de phase de signal - Google Patents

Systeme de detection de phase de signal Download PDF

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Publication number
WO2005079113A2
WO2005079113A2 PCT/IB2005/050423 IB2005050423W WO2005079113A2 WO 2005079113 A2 WO2005079113 A2 WO 2005079113A2 IB 2005050423 W IB2005050423 W IB 2005050423W WO 2005079113 A2 WO2005079113 A2 WO 2005079113A2
Authority
WO
WIPO (PCT)
Prior art keywords
electro
detection
acoustic transducer
phase
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.)
Ceased
Application number
PCT/IB2005/050423
Other languages
English (en)
Other versions
WO2005079113A3 (fr
Inventor
Chin Y. Koo
Hang M. Teo
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2005079113A2 publication Critical patent/WO2005079113A2/fr
Publication of WO2005079113A3 publication Critical patent/WO2005079113A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/05—Detection of connection of loudspeakers or headphones to amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/008—Visual indication of individual signal levels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments

Definitions

  • the present invention relates to a detection apparatus and method for detecting a phase difference between a first signal supplied to a first electro-acoustic transducer means, such as a first loudspeaker, and a second signal applied to a second electro-acoustic transducer means, such as a second loudspeaker. It is desired to maintain a predetermined phase relationship between stereophonically related signals to obtain full benefit of stereophonic reproduction. Thus, if stereophonically related signals of incorrect phase are added together for transmission by a monophonic broadcasting station or if one side of a pair of stereo loudspeakers is connected out-of-phase with respect to the other by mistake, the center sounds reproduced at a receiving side will be attenuated and distorted. Such errors in phasing cause incorrect stereophonic reproduction and low frequencies are attenuated, leading to a loss of bass. In conventional systems, phase connections of loudspeakers therefore had to be manually checked.
  • Document US 3,148,287 discloses a signal phase sensing and maintaining system for continuously maintaining a predetermined phase between related signals such as stereophonic sound signals.
  • left and right signals from corresponding left and right transmission channels are combined both additively and subtractively to produce a monophonic or centered component and a stereophonic component.
  • the two components are continuously compared in magnitude and whenever the magnitude of the difference component is found to be greater than the sum component, the signal in one of the channels is immediately reversed to restore the proper phase relation. In this fashion, the proper phase relation between the two stereophonic signals is always maintained, regardless of erroneous system connections.
  • movable switch contacts normally are maintained in engagement with fixed contacts so long as the sum of the signals in the two channels is greater in magnitude than the difference.
  • the switch is operated, reversing the signal in its channel so that the proper phase relation between the two signals is maintained.
  • this prior art requires a quite complex and sophisticated mechanical construction and thus involves high production costs.
  • This object is achieved by a detection apparatus as claimed in claim 1 and by a detection method as claimed in claim 10.
  • the above object is achieved by an electro-acoustic transducer apparatus as claimed in claim 11 and a processing apparatus as claimed in claim 12.
  • two magnetic field or current detectors are provided for the respect first and second electro-acoustic transducer means to measure the respective directions of magnetic field or current in order to derive detection outputs which can be used to detect a phase difference and to provide a corresponding control output.
  • the system is able to fully detect and correct for out-of-phase connections at the electro-acoustic transducer means or for other phase differences caused during the supply of the first and second signals to the electro-acoustic transducer means.
  • the first and second detection means each may comprise respective non- invasive sensing means for sensing the induced magnetic field or current.
  • the use of non- invasive sensing means provides the advantage that little modifications are required at the electro-acoustic transducer means, e.g. loudspeakers, such that the detection system can be easily implemented without major changes.
  • the respective non-invasive sensing means may comprise Hall sensing means for magnetic field sensing.
  • Such Hall sensing means provide the advantage of small size and can thus be easily mounted at the electro- acoustic transducer means.
  • the respective non-invasive sensing means may be mounted onto respective housings of the first and second electro-acoustic transducer means at a location arranged on a central axis of respective coil means of the first and second electro- acoustic transducer means. This mounting location of the non-invasive sensing means assures maximum detection of the magnetic field induced by the current of the coil means.
  • the control means may be arranged to supply a predetermined test signal to the first and second electro-acoustic transducer means, and to generate the control output based on the detection outputs corresponding to the predetermined test signal.
  • the predetermined test signal may have a pulse shape.
  • the current induced in the electro-acoustic transducer means will thus either generate a magnetic north or south pole depending on the phase of the supplied first and second signals, due to the fact that the pulse shaped test signal only comprises two discrete values. This enables easy detection of an out- of-phase relationship.
  • other predetermined shapes of the test signal can be used as well.
  • the control output of the control means may be generated so as to invert the phase of one of the first and second signals, if the detection outputs indicate an out- of-phase relationship between the first and second signals. Thereby, automatic correction of out-of-phase connections and supplies can be assured.
  • control means may be arranged to generate an audible or visible output if the detection outputs indicate an out-of-phase relationship between the first and second signals.
  • a user of the apparatus may then manually initiate the phase change or actually carry out a change of the connections at the electro -acoustic transducers when the audible or visible output has been noticed.
  • Fig. 1 shows a schematic block diagram of a phase detection apparatus according to the preferred embodiment
  • Fig. 2 shows a schematic diagram of a cross section of a loudspeaker modification according to the preferred embodiment.
  • Fig. 1 shows a schematic diagram of a stereophonic sound reproduction system which comprises a processor 10, which may be a digital signal processor or microprocessor for sound processing having control inputs for inputting phase detection signals obtained from respective loudspeakers 32, 34, and stereophonic signal outputs L and R for outputting stereophonic signals to be supplied via a power amplifier 20 to a left loudspeaker 32 and a right loudspeaker 34, respectively.
  • the power amplifier 20 supplies the respective stereophonic signals via respective left connection lines L+ and L- connected to the left loudspeaker 32, and right connection lines R+ and R- connected to the right loudspeaker 34.
  • the left and right loudspeakers 32, 34 have mounted thereon respective non-invasive magnetic field or current detectors 42, 44 having respective detection outputs connected to corresponding control inputs of the processor 10.
  • the detectors 42, 44 may be any suitable detector which allows detection or measurement of a direction and/or amount of drive current or magnetic field strength generated in or supplied to the left and right loudspeakers 32, 34.
  • the non-invasive detectors may be Hall effect transducers or Hall sensors 42, 44 mounted e.g. onto dust caps or any other suitable detection position of the respective left and right loudspeakers 32, 34.
  • the mounting position may be on-axis with or on the central axis of a voice coil of the loudspeakers 32, 34.
  • Hall sensors 42, 44 The function of the Hall sensors 42, 44 is based on the physical principal of the Hall effect named after its discoverer E.H. Hall. According to this Hall effect, a voltage is generated transversely to the current flow direction in an electric conductor, if a magnetic field is applied perpendicularly to the conductor. As the Hall effect is most pronounced in semiconductors, the most suitable Hall element is a small platelet made of semiconductor material. Particularly, Hall sensors are provided having the Hall element with its entire evaluation circuitry integrated on a single silicon chip. This chip may be produced using' CMOS (Complementary Metal Oxide Semiconductor) technology. They may be provided in leaded or SMD (Surface Mounted Device) package.
  • CMOS Complementary Metal Oxide Semiconductor
  • the processor 10 may be arranged to output a predetermined test pulse, such that the pulse current to the voice coil of the left and right loudspeakers 32, 34 will generate either a magnetic north or south pole on-axis to the coil, depending on a phase connection of ⁇ the speaker connections L+, L-, R+, R-.
  • This magnetic polarity is detected by the respective Hall sensors 42, 44 and is fed back via the control input of the processor 10 for analysis.
  • the respective Hall sensors 42, 44 will detect the same polarity, either both magnetic north poles or both magnetic south poles. Otherwise, if opposite magnetic polarity is detected by the two Hall sensors 42, 44, this means that one of the channel is connected with the wrong polarity.
  • the audio output for one of the channels L and R will be inverted by the processor 10 so that both outputs will be in-phase with each other.
  • the processor 10 may generate an audible output, e.g. via at least one of the loudspeakers 32, 34, or a visible output, e.g.
  • connection lines R+ and L+ are connected to the respective positive terminals of the respective loudspeakers 32, 34, the processor 10 will judge correct connection of the speakers 32, 34. Otherwise, if one of the connection lines R+ and L- is connected to the negative terminal, the processor 10 will determine an out-of-phase relationship and will correspondingly correct the phase of one of the signals L and R.
  • LED light emitting diode
  • connection lines R+ and L+ are connected to the respective negative terminals, the loudspeakers 32, 34 are deemed in phase, but the absolute phase is wrong. This can be corrected if an ability for absolute phase correction is implemented in the processor 10. It is noted that the above correction also enables phase correction of the signals if the loudspeakers 32, 34 are connected in the right manner, but one of the signals L and R is supplied to the processor 10 at a wrong phase relationship.
  • Fig. 2 shows a schematic diagram of a cross section, which might correspond to each one of the loudspeakers 32, 34, to indicate a possible location of the Hall sensors 42, 44.
  • the bold arrows indicate magnetic flux directions generated by a voice coil 302 provided on a magnetic south pole region 304 of a permanent magnet of the loudspeaker.
  • the voice coil 302 is movably arranged in a gap portion, which may be a circular gap portion, between the magnetic south pole region 304 and opposing north pole regions 308 of the permanent magnet.
  • the voice coil 302 is fixed to a movable conical portion 306 of the loudspeaker. Based on the direction of current flowing through the voice coil 302, the movable conical portion 306 is either pushed in the upper direction or in the lower direction of Fig. 2.
  • the current in the voice coil 302 is generated based on the respective signal supplied via the connection lines L+, L- or R+, R-, respectively.
  • the dotted bold arrow in Fig. 2 indicates a first voice coil flux direction and the continuous bold arrow indicates a second voice coil flux direction, e.g. N (north) or S (south) direction, respectively, which depend on the polarity connection of the loudspeakers 32, 34.
  • This magnetic flux direction is detected by the Hall sensors 42, 44 which are mounted e.g. on the dust cap on-axis to the voice coil 302.
  • any other suitable position can be selected for mounting the Hall sensors 42, 44 or any other non-invasive current or magnetic field sensor adapted to detect the magnetic field generated by the voice coil 302 or the current flowing through the voice coil 302.
  • the present invention is applicable for use in all systems with loudspeakers or other electro-acoustic transducers driven by conventional drivers, including cone speakers, flat panel speakers and the like.
  • the present invention facilitates the implementation of automatic power-up diagnostics for speaker phase connection in audio systems.
  • the present invention relates to a detection system and method for detecting a phase difference between a first signal supplied to a first electro-acoustic transducer means and a second signal supplied to a second electro-acoustic transducer means, wherein first and second detection means are provided for detecting magnetic fields or currents induced by said first and second signals into the first and second electro-acoustic transducer means.
  • a control output is generated based on a comparison of detection outputs of the first and second detection means.
  • This control output can then be used for correcting the phase relationship between the first and second signals or for providing a corresponding audible or visible indication to a user.
  • detection and correction of out-of-phase connections of loudspeakers or other electro-acoustic transducers can be provided at moderate system configurations.
  • This automatic detection and correction configuration leads to a user- friendly phase detection system. It is noted that the present invention is not restricted to the above-preferred embodiment, and various modifications with respect to the location and kind of current or magnetic field sensors are intended to be covered by the invention. The preferred embodiments may thus vary within the scope of the attached claims.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Phase Differences (AREA)

Abstract

L'invention concerne un système et un procédé de détection d'une différence de phase entre un premier signal envoyé à un premier moyen transducteur électroacoustique (32) et un second signal envoyé à un second moyen transducteur électroacoustique (34), des premier et second moyens de détection étant prévus pour la détection de champs magnétiques ou de courants induits par lesdits premier et second signaux dans lesdits premier et second moyens transducteurs électroacoustiques. Une sortie de commande est générée en fonction d'une comparaison de sorties de détection des premier et second moyens de détection. Cette sortie de commande peut être utilisée pour corriger la relation de phase entre les premier et second signaux ou pour fournir à un utilisateur une indication visible ou sonore correspondante. Ainsi, la détection et la correction des connexions déphasées de haut-parleurs ou d'autres transducteurs électro-acoustiques peuvent être assurées sur des configurations de système modérées. Cette configuration de correction et de détection automatiques permet de produire un système de détection de phase convivial.
PCT/IB2005/050423 2004-02-10 2005-02-01 Systeme de detection de phase de signal Ceased WO2005079113A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04100483.9 2004-02-10
EP04100483 2004-02-10

Publications (2)

Publication Number Publication Date
WO2005079113A2 true WO2005079113A2 (fr) 2005-08-25
WO2005079113A3 WO2005079113A3 (fr) 2006-02-23

Family

ID=34854672

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/050423 Ceased WO2005079113A2 (fr) 2004-02-10 2005-02-01 Systeme de detection de phase de signal

Country Status (1)

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WO (1) WO2005079113A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148287A (en) * 1961-03-09 1964-09-08 Columbia Broadcasting Syst Inc Signal phase sensing and maintaining system
US4555795A (en) * 1982-07-22 1985-11-26 Tvi Systems, Ltd. Monaural to binaural audio processor
FR2839602A1 (fr) * 2002-05-13 2003-11-14 Claude Bernard Roch Carpentier Dispositif de reproduction sonore stereophonique dans un vehicule et vehicule ainsi equipe

Also Published As

Publication number Publication date
WO2005079113A3 (fr) 2006-02-23

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