US20040047475A1 - Audio noise cancellation system for a sensor in an automotive vehicle - Google Patents
Audio noise cancellation system for a sensor in an automotive vehicle Download PDFInfo
- Publication number
- US20040047475A1 US20040047475A1 US10/065,006 US6500602A US2004047475A1 US 20040047475 A1 US20040047475 A1 US 20040047475A1 US 6500602 A US6500602 A US 6500602A US 2004047475 A1 US2004047475 A1 US 2004047475A1
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- United States
- Prior art keywords
- sensor
- output
- electrical
- recited
- speaker
- 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.)
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- 238000000034 method Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
Definitions
- the present invention relates generally to a compensation circuit for automotive sensors, and more particularly, to a circuit to compensate the output of a sensor for noise generated by an audio system.
- Sensors are used for various applications in automotive vehicles. Sensors may be located in various locations such as the passenger compartment.
- Audio systems include various speakers including a subwoofer.
- the subwoofer is large and difficult to package.
- the subwoofer may be positioned in a close proximity to a sensor.
- the output of the speaker and, in particular, the output of a subwoofer is a low frequency, high-power signal that generates acoustic energy that may affect the output of the sensor.
- the output of the sensor may vibrate or move in response to the output of the subwoofer.
- One proposed solution to compensation is to use a microphone that receives signals from the speaker and converts the signals to electrical signals.
- interference from the subwoofer body may be present due to the location of the microphone.
- the circuit may be very accurate.
- flexibility of packaging a microphone near the subwoofer presents difficulties particularly in the limited automotive vehicle package spaces.
- a compensation circuit for a sensor generating electrical sensor output is positioned near a speaker of an audio system and comprises an inverting circuit electrically coupled to the electrical output of the audio system.
- the inverting circuit generates an inverted electrical signal corresponding to a speaker audio output.
- a sensor controller is coupled to the inverting circuit and the sensor. The controller generates a compensated electrical output in response to the electrical sensor output and the inverted electrical signal.
- a method for compensating for an electrical output of a sensor comprises generating an electrical signal at an audio system output and electrical input to a speaker; inverting the electrical signal to form an inverted electrical signal; generating an electrical sensor output signal altered by the acoustics of the speaker; and combining the inverted electrical signal and sensor output signal to form a compensated electrical output.
- One advantage of the invention is that the various sensors may be packaged without regard to the location of the speakers of the audio system. Such a system will therefore increase package flexibility in the limiting packaging space of the automotive vehicle.
- FIG. 1 is a schematic view of a compensation circuit according to the present invention.
- FIG. 2 is a plot of a normal sensor output.
- FIG. 3 is a plot of the output of the subwoofer.
- FIG. 4 is a plot of sensor output that has been affected by the output of a subwoofer.
- the present invention is described with respect to a sensor and subwoofer positioned in a passenger compartment of an automotive vehicle.
- the present invention may also be used for sensors positioned within the trunk compartment, engine compartment, or various other locations within the automotive vehicle.
- a passenger compartment 10 of an automotive vehicle is illustrated having a compensation circuit 12 according to the present invention.
- the compensation circuit is electrically coupled to an audio system 14 .
- Compensation circuit 12 is preferably coupled to an electrical output 16 of the audio system 14 .
- the electrical output 16 is used to electrically power a speaker 18 .
- Speaker 18 may, for example, be a subwoofer or other type of speaker.
- the electrical signal from the audio system generated by electrical output 16 is used to drive a transducer coil within speaker 18 .
- the speaker 18 generates audible sound signals 20 which may be received and influence a sensor 22 .
- Sensor 22 may be one of a variety of types of sensors including a pressure sensor.
- Controller 24 is preferably microprocessor-based. However, analog and or digital circuitry may also act as a controller.
- Compensation circuit 12 includes an inverting circuit 26 that has an input 28 coupled to the electrical output 16 of audio system 14 and therefore to the input of speaker 16 .
- capacitor C 1 may be employed.
- Capacitor C is coupled to input 28 and to a resistor R 1 .
- Resistor R 1 is coupled between capacitor C 1 and the inverting terminal 30 of an operational amplifier 32 .
- Inverting terminal 30 of operational amplifier 32 may also be coupled to a feedback resistor R 2 which in turn is coupled to an output 34 of operational amplifier 32 .
- Operational amplifier 32 may also have a non-inverting terminal 36 coupled to a resistor R 3 which in turn is coupled to a reference voltage V cc 2
- R 1 , R 2 and R 3 By properly choosing the resistance values of R 1 , R 2 and R 3 , an inverted electrical signal is generated at output 34 .
- the resistors R 1 R 2 R 3 are, equal to obtain unity gain and was set to R1 ⁇ 2.
- R 1 and R 2 may be 100 k ohms and R 3 may be 50K ohms.
- the capacitor is sized to block DC offset and thus depends on the input to which it is attached.
- Capacitor C 1 may, for example, be 1 uF.
- the resistor values may be chosen to amplify the signals as well.
- Output 34 may be electrically coupled to a delay circuit 40 .
- Delay circuit 40 is an optional feature that is used to align the inverting signal temporally with the output of the sensor.
- Various types of circuits may be used for delay circuit 40 . Such circuits are well known to those skilled in the art.
- the delay circuit generates a delay signal that is added to the inverted electrical signal from the output 34 of operational amplifier 32 .
- the delayed inverted output signal is coupled to controller 24 .
- Controller 24 combines the inverted electrical signal and the sensor output signal to form a compensated output signal at an output 42 of controller 24 .
- controller 24 may also use the compensated signal therein. Controller 24 may merely add the two signals together to form the compensated electrical output. Referring now to FIG. 2, a plot of the normal sensor output versus time is illustrated. In FIG.
- FIG. 3 the subwoofer output versus time is illustrated.
- This signal is the electrical output of the audio system.
- FIG. 4 includes the sensor output that has been affected by the subwoofer output.
- the compensated output signal of the present invention is thus similar to that of FIG. 2.
- the present invention does not rely on the positioning of a microphone or other transducer device directly adjacent to the speaker.
- increased flexibility is achieved in applying the compensation circuit of the present invention. While particular embodiments of the invention have been shown and described, numerous variations and alternate embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention be limited only in terms of the appended claims.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Amplifiers (AREA)
Abstract
Description
- The present invention relates generally to a compensation circuit for automotive sensors, and more particularly, to a circuit to compensate the output of a sensor for noise generated by an audio system.
- Sensors are used for various applications in automotive vehicles. Sensors may be located in various locations such as the passenger compartment.
- Audio systems include various speakers including a subwoofer. The subwoofer is large and difficult to package. As such, the subwoofer may be positioned in a close proximity to a sensor.
- The output of the speaker and, in particular, the output of a subwoofer is a low frequency, high-power signal that generates acoustic energy that may affect the output of the sensor. In particular, the output of the sensor may vibrate or move in response to the output of the subwoofer.
- One proposed solution to compensation is to use a microphone that receives signals from the speaker and converts the signals to electrical signals. However, interference from the subwoofer body may be present due to the location of the microphone. Thus, the circuit may be very accurate. Also, flexibility of packaging a microphone near the subwoofer presents difficulties particularly in the limited automotive vehicle package spaces.
- It would therefore be desirable to remove the influence of the subwoofer on the output of the sensor.
- The present invention reduces the influence of the subwoofer on the output of a sensor from prior known methods. In one aspect of the invention a compensation circuit for a sensor generating electrical sensor output is positioned near a speaker of an audio system and comprises an inverting circuit electrically coupled to the electrical output of the audio system. The inverting circuit generates an inverted electrical signal corresponding to a speaker audio output. A sensor controller is coupled to the inverting circuit and the sensor. The controller generates a compensated electrical output in response to the electrical sensor output and the inverted electrical signal.
- In a further aspect of the invention, a method for compensating for an electrical output of a sensor comprises generating an electrical signal at an audio system output and electrical input to a speaker; inverting the electrical signal to form an inverted electrical signal; generating an electrical sensor output signal altered by the acoustics of the speaker; and combining the inverted electrical signal and sensor output signal to form a compensated electrical output.
- One advantage of the invention is that the various sensors may be packaged without regard to the location of the speakers of the audio system. Such a system will therefore increase package flexibility in the limiting packaging space of the automotive vehicle.
- Other advantages and features of the present invention will become apparent when viewed in light of the detailed description of the preferred embodiment when taken in conjunction with the attached drawings and appended claims.
- FIG. 1 is a schematic view of a compensation circuit according to the present invention.
- FIG. 2 is a plot of a normal sensor output.
- FIG. 3 is a plot of the output of the subwoofer.
- FIG. 4 is a plot of sensor output that has been affected by the output of a subwoofer.
- The present invention is described with respect to a sensor and subwoofer positioned in a passenger compartment of an automotive vehicle. The present invention may also be used for sensors positioned within the trunk compartment, engine compartment, or various other locations within the automotive vehicle.
- Referring now to FIG. 1, a
passenger compartment 10 of an automotive vehicle is illustrated having acompensation circuit 12 according to the present invention. The compensation circuit is electrically coupled to anaudio system 14.Compensation circuit 12 is preferably coupled to anelectrical output 16 of theaudio system 14. Theelectrical output 16 is used to electrically power aspeaker 18.Speaker 18 may, for example, be a subwoofer or other type of speaker. The electrical signal from the audio system generated byelectrical output 16 is used to drive a transducer coil withinspeaker 18. Thespeaker 18 generatesaudible sound signals 20 which may be received and influence asensor 22. Thus, the electrical signal corresponds to eventual output of the speaker.Sensor 22 may be one of a variety of types of sensors including a pressure sensor. Thus, the output of thepressure sensor 22 is changed according to theaudible signals 20 generated byspeaker 18.Sensor 22 is coupled to a sensor controller 24. Controller 24 is preferably microprocessor-based. However, analog and or digital circuitry may also act as a controller. -
Compensation circuit 12 includes aninverting circuit 26 that has aninput 28 coupled to theelectrical output 16 ofaudio system 14 and therefore to the input ofspeaker 16. To filter out any DC offset, capacitor C1 may be employed. Capacitor C is coupled to input 28 and to a resistor R1. Resistor R1 is coupled between capacitor C1 and the invertingterminal 30 of anoperational amplifier 32. Invertingterminal 30 ofoperational amplifier 32 may also be coupled to a feedback resistor R2 which in turn is coupled to anoutput 34 ofoperational amplifier 32.Operational amplifier 32 may also have anon-inverting terminal 36 coupled to a resistor R3 which in turn is coupled to a referencevoltage - . By properly choosing the resistance values of R1, R2 and R3, an inverted electrical signal is generated at
output 34. In one constructed embodiment, the resistors R1 R2 R3 are, equal to obtain unity gain and was set to R½. By way of example, R1 and R2 may be 100 k ohms and R3 may be 50K ohms. The capacitor is sized to block DC offset and thus depends on the input to which it is attached. Capacitor C1 may, for example, be 1 uF. Of course, the resistor values may be chosen to amplify the signals as well.Output 34 may be electrically coupled to adelay circuit 40.Delay circuit 40 is an optional feature that is used to align the inverting signal temporally with the output of the sensor. Various types of circuits may be used fordelay circuit 40. Such circuits are well known to those skilled in the art. The delay circuit generates a delay signal that is added to the inverted electrical signal from theoutput 34 ofoperational amplifier 32. The delayed inverted output signal is coupled to controller 24. Controller 24 combines the inverted electrical signal and the sensor output signal to form a compensated output signal at an output 42 of controller 24. Of course, controller 24 may also use the compensated signal therein. Controller 24 may merely add the two signals together to form the compensated electrical output. Referring now to FIG. 2, a plot of the normal sensor output versus time is illustrated. In FIG. 3 the subwoofer output versus time is illustrated. This signal is the electrical output of the audio system. FIG. 4 includes the sensor output that has been affected by the subwoofer output. When the electrical output of the audio system is inverted and added to FIG. 4, the compensated output signal of the present invention is thus similar to that of FIG. 2. Advantageously, the present invention does not rely on the positioning of a microphone or other transducer device directly adjacent to the speaker. Thus, for automotive applications increased flexibility is achieved in applying the compensation circuit of the present invention. While particular embodiments of the invention have been shown and described, numerous variations and alternate embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention be limited only in terms of the appended claims.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/065,006 US20040047475A1 (en) | 2002-09-09 | 2002-09-09 | Audio noise cancellation system for a sensor in an automotive vehicle |
DE10336977A DE10336977B4 (en) | 2002-09-09 | 2003-08-12 | Compensation circuit for eliminating audio noise on an automotive sensor and compensation method |
GB0319155A GB2392796A (en) | 2002-09-09 | 2003-08-15 | An audio noise cancellation apparatus for a sensor in an automative vehicle |
US11/161,096 US7127073B2 (en) | 2002-09-09 | 2005-07-22 | Audio noise cancellation system for a sensor in an automotive vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/065,006 US20040047475A1 (en) | 2002-09-09 | 2002-09-09 | Audio noise cancellation system for a sensor in an automotive vehicle |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/161,096 Continuation-In-Part US7127073B2 (en) | 2002-09-09 | 2005-07-22 | Audio noise cancellation system for a sensor in an automotive vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040047475A1 true US20040047475A1 (en) | 2004-03-11 |
Family
ID=28452221
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/065,006 Abandoned US20040047475A1 (en) | 2002-09-09 | 2002-09-09 | Audio noise cancellation system for a sensor in an automotive vehicle |
US11/161,096 Expired - Fee Related US7127073B2 (en) | 2002-09-09 | 2005-07-22 | Audio noise cancellation system for a sensor in an automotive vehicle |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/161,096 Expired - Fee Related US7127073B2 (en) | 2002-09-09 | 2005-07-22 | Audio noise cancellation system for a sensor in an automotive vehicle |
Country Status (3)
Country | Link |
---|---|
US (2) | US20040047475A1 (en) |
DE (1) | DE10336977B4 (en) |
GB (1) | GB2392796A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4583781B2 (en) * | 2003-06-12 | 2010-11-17 | アルパイン株式会社 | Audio correction device |
JP4375088B2 (en) * | 2004-03-31 | 2009-12-02 | トヨタ紡織株式会社 | Variable silencer controller |
US20120259224A1 (en) * | 2011-04-08 | 2012-10-11 | Mon-Ju Wu | Ultrasound Machine for Improved Longitudinal Tissue Analysis |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5473686A (en) * | 1994-02-01 | 1995-12-05 | Tandy Corporation | Echo cancellation apparatus |
US5619581A (en) * | 1994-05-18 | 1997-04-08 | Lord Corporation | Active noise and vibration cancellation system |
US5633936A (en) * | 1995-01-09 | 1997-05-27 | Texas Instruments Incorporated | Method and apparatus for detecting a near-end speech signal |
US5862234A (en) * | 1992-11-11 | 1999-01-19 | Todter; Chris | Active noise cancellation system |
US5978489A (en) * | 1997-05-05 | 1999-11-02 | Oregon Graduate Institute Of Science And Technology | Multi-actuator system for active sound and vibration cancellation |
US6002761A (en) * | 1994-07-19 | 1999-12-14 | Sremac; Steve | Multi-line programmable telephone call annunciator |
US6041126A (en) * | 1995-07-24 | 2000-03-21 | Matsushita Electric Industrial Co., Ltd. | Noise cancellation system |
US20030156723A1 (en) * | 2000-09-01 | 2003-08-21 | Dietmar Ruwisch | Process and apparatus for eliminating loudspeaker interference from microphone signals |
US6671379B2 (en) * | 2001-03-30 | 2003-12-30 | Think-A-Move, Ltd. | Ear microphone apparatus and method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1305359A (en) * | 1970-01-20 | 1973-01-31 | ||
US5243661A (en) * | 1990-04-09 | 1993-09-07 | Sony Corporation | Microphone apparatus |
DE4236155C2 (en) * | 1992-10-20 | 1996-02-08 | Gsp Sprachtechnologie Ges Fuer | Method and arrangement for active interior noise reduction in vehicles |
DE4303921A1 (en) * | 1993-02-10 | 1994-08-11 | Bayerische Motoren Werke Ag | Method for measuring a differential sound by subtracting a sound just emitted via a loudspeaker from a total sound |
DE19733920A1 (en) * | 1997-08-06 | 1999-02-25 | Forschungszentrum Juelich Gmbh | Device for suppressing interference signals with frequency-dependent adaptation |
DE19814971A1 (en) * | 1998-04-03 | 1999-10-07 | Daimlerchrysler Aerospace Ag | Procedure for the elimination of interference from a microphone signal |
JP2000023282A (en) * | 1998-07-01 | 2000-01-21 | Matsushita Electric Ind Co Ltd | Acoustic reproducer |
DE10051699A1 (en) * | 2000-10-18 | 2002-05-02 | Guimet Marie Helene | Microphone for voice acquisition in environment subjected to loudspeaker sound adds electrical audio signals controlling loudspeaker membrane to microphone signal |
-
2002
- 2002-09-09 US US10/065,006 patent/US20040047475A1/en not_active Abandoned
-
2003
- 2003-08-12 DE DE10336977A patent/DE10336977B4/en not_active Expired - Fee Related
- 2003-08-15 GB GB0319155A patent/GB2392796A/en not_active Withdrawn
-
2005
- 2005-07-22 US US11/161,096 patent/US7127073B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5862234A (en) * | 1992-11-11 | 1999-01-19 | Todter; Chris | Active noise cancellation system |
US5473686A (en) * | 1994-02-01 | 1995-12-05 | Tandy Corporation | Echo cancellation apparatus |
US5619581A (en) * | 1994-05-18 | 1997-04-08 | Lord Corporation | Active noise and vibration cancellation system |
US6002761A (en) * | 1994-07-19 | 1999-12-14 | Sremac; Steve | Multi-line programmable telephone call annunciator |
US5633936A (en) * | 1995-01-09 | 1997-05-27 | Texas Instruments Incorporated | Method and apparatus for detecting a near-end speech signal |
US6041126A (en) * | 1995-07-24 | 2000-03-21 | Matsushita Electric Industrial Co., Ltd. | Noise cancellation system |
US5978489A (en) * | 1997-05-05 | 1999-11-02 | Oregon Graduate Institute Of Science And Technology | Multi-actuator system for active sound and vibration cancellation |
US20030156723A1 (en) * | 2000-09-01 | 2003-08-21 | Dietmar Ruwisch | Process and apparatus for eliminating loudspeaker interference from microphone signals |
US6671379B2 (en) * | 2001-03-30 | 2003-12-30 | Think-A-Move, Ltd. | Ear microphone apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
DE10336977A1 (en) | 2004-03-25 |
US20060002568A1 (en) | 2006-01-05 |
DE10336977B4 (en) | 2005-08-04 |
GB2392796A (en) | 2004-03-10 |
US7127073B2 (en) | 2006-10-24 |
GB0319155D0 (en) | 2003-09-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FORD MOTOR COMPANY, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BROWN, JOSEPH ROBERT;CARR, KIRSTEN MARIE;CUDDIHY, MARK A.;REEL/FRAME:013062/0868;SIGNING DATES FROM 20020726 TO 20020729 Owner name: FORD GLOBAL TECHNOLOGIES, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FORD MOTOR COMPANY;REEL/FRAME:013062/0866 Effective date: 20020909 |
|
AS | Assignment |
Owner name: FORD GLOBAL TECHNOLOGIES, LLC, MICHIGAN Free format text: MERGER;ASSIGNOR:FORD GLOBAL TECHNOLOGIES, INC.;REEL/FRAME:013987/0838 Effective date: 20030301 Owner name: FORD GLOBAL TECHNOLOGIES, LLC,MICHIGAN Free format text: MERGER;ASSIGNOR:FORD GLOBAL TECHNOLOGIES, INC.;REEL/FRAME:013987/0838 Effective date: 20030301 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |