EP1468586A2 - Diagnostic circuit for a tweeter in a loudspeaker combination - Google Patents
Diagnostic circuit for a tweeter in a loudspeaker combinationInfo
- Publication number
- EP1468586A2 EP1468586A2 EP03729411A EP03729411A EP1468586A2 EP 1468586 A2 EP1468586 A2 EP 1468586A2 EP 03729411 A EP03729411 A EP 03729411A EP 03729411 A EP03729411 A EP 03729411A EP 1468586 A2 EP1468586 A2 EP 1468586A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- voltage
- loudspeaker
- tweeter
- ual
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
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
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
Definitions
- the invention relates to a diagnostic circuit for a tweeter speaker of a speaker combination and a method for checking a tweeter speaker of a speaker combination.
- a woofer and a mid-range speaker or a mid-range speaker is connected directly to the amplifiers of the low-frequency power amplifiers and a tweeter is capacitively coupled.
- the functionality of this speaker combination is checked in particular when installed in a vehicle and, if necessary, in maintenance intervals or in the event of malfunctions. In particular, interruptions or short circuits in the supply lines or in the loudspeakers can occur.
- the check of the low-range, mid-range or mid-range speakers can be carried out directly resistively via an applied DC voltage.
- a corresponding check of the capacitively connected tweeters is however, this is not possible. Accordingly, this check is usually carried out by inputting a high tone signal and acoustic perception. However, such a check is time-consuming and inaccurate in the case of automated production.
- circuit arrangements are known in which the current consumption of an output stage IC is measured when it is exposed to a high LF frequency and a high output level.
- a measuring device must be provided in the power supply of the power output stages.
- the diagnostic circuit according to the invention as claimed in claim 1 and the method according to the invention as claimed in claim 13, in particular, have the advantage that an accurate measurement of the functionality of a high-frequency loudspeaker of a loudspeaker combination is possible with relatively little effort.
- the sub-claims describe preferred further developments.
- a check of the high-frequency loudspeaker is thus made possible in that a voltage divider circuit is formed from a preferably purely ohmic resistor and the loudspeaker combination and one
- Voltage drop within this voltage divider circuit is measured and evaluated.
- the voltage drop across the speaker combination can be measured as a complex measurement voltage; in principle, however, it is also possible to measure the voltage drop across the measuring resistor.
- the woofer, mid-range or mid-range speaker is connected in parallel with the coupling capacitor and the tweeter speaker.
- the functionality or state of the tweeter affects the complex overall resistance of the speaker combination at the RF frequency. An interruption on the tweeter or its leads leads to an increase in the total resistance, a short circuit correspondingly to a decrease in the total resistance compared to the total resistance with a functional tweeter. Since the loudspeakers designed for lower frequencies have a higher inductance than the high-frequency loudspeaker, they influence the measurement signal only slightly.
- the evaluation of the measured complex measuring voltage can e.g. by measuring the peak value out of phase with the output signal or by means of a rectifier circuit.
- FIG. 1 shows a block diagram of a power output stage with a diagnostic circuit according to a first embodiment of the invention
- FIG. 2 shows a block diagram of a power output stage with a diagnostic circuit according to a second embodiment of the invention.
- a first output amplifier VI of a low-frequency output stage is connected via a first connection AI to the positive pole on the loudspeaker combination 4 and a second output amplifier V2 of the low-frequency output stage is connected to the negative pole of the loudspeaker combination 4 via a second connection A2.
- the loudspeaker combination 4 has a mid-range speaker LSI, which is connected to the connections AI, A2, and a tweeter LS2 connected in parallel with LSI via a capacitor C7.
- a processor 10 outputs an RF input signal sl, which is output via an impedance converter 3 as an RF voltage signal s2.
- the processor 10 thus forms an RF voltage generating device 2 with the impedance converter 3.
- the RF input signal sl is given via a resistor R2 and a capacitor C4 to the first connection AI, ie the positive pole of the loudspeaker combination 4.
- the second connection A2 is connected to ground via a connecting device 6.
- the voltage dropping across the loudspeaker combination 4 and the connecting device 6 is tapped off at AI as a complex measuring voltage UAl.
- the processor 10 In the RF voltage generating device 2, the processor 10 outputs the RF input signal sl with a frequency of 20 KHz or greater and a diagnostic signal d as a DC voltage signal. A diagnostic mode is set by the diagnostic signal d. In this case, the processor 10 switches the output amplifiers VI, V2 to high impedance in a manner not shown by the diagnostic signal d.
- the RF voltage signal s is via a capacitor C2 together with the diagnostic signal d an emitter follower transistor V3 of the impedance converter 3, the operating point of the base of the emitter follower transistor V3 being set via resistors R4, R ⁇ .
- Another transistor V4 and a resistor R3 form a constant current source connected to the emitter of V3, V4 being turned on when the diagnostic signal d an_ is applied to its base.
- the impedance converter 3 outputs an RF voltage signal S2, which drops to ground via the measuring resistor R2, the capacitor C4, the loudspeaker combination 4 and the connecting device 6.
- the connecting device 6 has a transistor V5, which is driven by the diagnostic signal d and applies an AC voltage present at the second connection A2 to ground with low resistance. With suitable dimensioning of the capacitors C4, C7, the RF voltage signal S2 essentially drops across a series connection of R2 and the loudspeakers LSI and LS2 connected in parallel.
- the measuring voltage UAl applied to AI is received by a measuring device 11, which is formed by a resistor R1, a capacitor C8 and the processor 10 serving as an evaluation device.
- the measuring voltage UAl is phase-shifted in relation to S1, in particular because of the impedances of LSI and LS2.
- the phase-shifted peak value is determined by the measuring device 11 and the impedance of the loudspeaker combination 4 is determined therefrom if R2 is known. Since LSI has a high inductance, the voltage drop between AI and A2 is largely determined by LS2.
- the Measuring device 11 detects a low measuring voltage (or measuring voltage with a small amount), a high measuring voltage in the event of an interruption in LS2 and a medium measuring voltage when LS2 is in a functional state.
- a measuring device 12 in which a resistor Rl, the capacitor C7, a Schottky diode Dl and a capacitor C1 connected to ground serve to rectify the ac voltage signal picked up, so that the Processor 10 can receive a rectified voltage.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10201517 | 2002-01-17 | ||
DE10201517A DE10201517A1 (en) | 2002-01-17 | 2002-01-17 | Diagnostic circuit for a tweeter speaker of a speaker combination |
PCT/DE2003/000105 WO2003061333A2 (en) | 2002-01-17 | 2003-01-16 | Diagnostic circuit for a tweeter in a loudspeaker combination |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1468586A2 true EP1468586A2 (en) | 2004-10-20 |
EP1468586B1 EP1468586B1 (en) | 2016-06-01 |
Family
ID=7712311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03729411.3A Expired - Lifetime EP1468586B1 (en) | 2002-01-17 | 2003-01-16 | Diagnostic circuit for a tweeter in a loudspeaker combination |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050163326A1 (en) |
EP (1) | EP1468586B1 (en) |
DE (1) | DE10201517A1 (en) |
WO (1) | WO2003061333A2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101434302B1 (en) * | 2007-07-25 | 2014-08-27 | 삼성전자주식회사 | Method for detecting badness speaker and the sound apparatus using the same |
EP2048896B1 (en) * | 2007-10-12 | 2011-12-21 | STMicroelectronics Srl | Method and circuit for testing an audio high-frequency loudspeaker being part of a loudspeaker system |
EP2094030B1 (en) | 2008-02-21 | 2012-06-20 | STMicroelectronics Srl | Method for testing the operating conditions of an electric network and apparatus using said method |
FR2950146B1 (en) * | 2009-09-15 | 2011-12-09 | Sierra Wireless Inc | DIAGNOSTIC DEVICE FOR A CORRESPONDING OHIM DEVICE, EQUIPMENT AND ELECTRONIC CIRCUIT |
DE102010005746A1 (en) * | 2010-01-26 | 2011-07-28 | Fresenius Medical Care Deutschland GmbH, 61352 | Medical device |
CN104717595B (en) * | 2015-03-16 | 2018-01-26 | 高创(苏州)电子有限公司 | A kind of detection method, the detection means of loudspeaker module function |
FR3104115B1 (en) * | 2019-12-10 | 2021-11-26 | Psa Automobiles Sa | Device for monitoring, on board a motor vehicle, the operation of a vehicle speaker and vehicle fitted with such a device |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA956576A (en) * | 1972-09-06 | 1974-10-22 | General Signal Corporation | Circuit integrity checking means for audio signal circuit |
US3912883A (en) * | 1974-03-26 | 1975-10-14 | Gen Signal Corp | Direct current supervisory system |
US3989908A (en) * | 1975-06-26 | 1976-11-02 | General Signal Corporation | Speaker supervision in a public address system |
US4330686A (en) * | 1978-12-21 | 1982-05-18 | Stephen Roe | Loudspeaker systems |
US4583245A (en) * | 1984-06-14 | 1986-04-15 | Renkus-Heinz, Inc. | Speaker system protection circuit |
DE3627960C1 (en) * | 1986-08-18 | 1987-09-03 | Philips Patentverwaltung | Monitoring device for loudspeaker installations |
US4887298A (en) * | 1988-06-15 | 1989-12-12 | Renkus-Heinz | Electronic circuit for sensing disconnect or failure of a power output sense line in an audio power system |
US5255324A (en) * | 1990-12-26 | 1993-10-19 | Ford Motor Company | Digitally controlled audio amplifier with voltage limiting |
US5345510A (en) * | 1992-07-13 | 1994-09-06 | Rauland-Borg Corporation | Integrated speaker supervision and alarm system |
US5548650A (en) * | 1994-10-18 | 1996-08-20 | Prince Corporation | Speaker excursion control system |
DE19513066A1 (en) * | 1995-04-07 | 1996-10-10 | Philips Patentverwaltung | Circuit arrangement for checking the connection of a sound reproduction device to a sound signal source |
JP3127813B2 (en) * | 1995-12-05 | 2001-01-29 | ヤマハ株式会社 | Audio amplifier protection circuit |
DE19628014C2 (en) * | 1996-07-02 | 1998-10-08 | Johannes Von Reusner | Crossover for loudspeakers and loudspeaker with such a crossover |
DE19629781C1 (en) * | 1996-07-24 | 1997-08-21 | Bosch Gmbh Robert | Bridge terminating stage impedance testing method |
JPH10136493A (en) * | 1996-10-28 | 1998-05-22 | Toa Corp | Inspection device for speaker line |
JP3908434B2 (en) * | 2000-03-06 | 2007-04-25 | パイオニア株式会社 | Information equipment with speakers |
-
2002
- 2002-01-17 DE DE10201517A patent/DE10201517A1/en not_active Withdrawn
-
2003
- 2003-01-16 EP EP03729411.3A patent/EP1468586B1/en not_active Expired - Lifetime
- 2003-01-16 WO PCT/DE2003/000105 patent/WO2003061333A2/en active Application Filing
- 2003-01-16 US US10/501,288 patent/US20050163326A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO03061333A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003061333A3 (en) | 2004-04-15 |
US20050163326A1 (en) | 2005-07-28 |
WO2003061333A2 (en) | 2003-07-24 |
EP1468586B1 (en) | 2016-06-01 |
DE10201517A1 (en) | 2003-08-07 |
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