US3568144A - Sound viewer apparatus - Google Patents

Sound viewer apparatus Download PDF

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Publication number
US3568144A
US3568144A US3568144DA US3568144A US 3568144 A US3568144 A US 3568144A US 3568144D A US3568144D A US 3568144DA US 3568144 A US3568144 A US 3568144A
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Prior art keywords
means
signal
corresponding
invention
filters
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Maria L M Streb
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DEWAR PRODUCTS CORP
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DEWAR PRODUCTS CORP
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    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61LGUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L29/00Safety means for rail/road crossing traffic
    • B61L29/24Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
    • B61L29/246Signals or brake- or lighting devices mounted on the road vehicle and controlled from the vehicle train
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B1/00Systems for signalling characterised solely by the form of transmission of the signal
    • G08B1/08Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/06Transformation of speech into a non-audible representation, e.g. speech visualisation or speech processing for tactile aids

Abstract

A sound viewer apparatus is described, including means for receiving an audio signal and converting it into an electrical signal, at least one amplifier for adjusting the intensity level of the electrical signal; a plurality of filters, each having a band-pass corresponding to the major frequency components of the audio signal produced by a particular device (viz a car engine, train whistle, horn or emergency vehicle siren); indicator means, such as lamps, connected to the output of the filters; and automatic gain control means responsive to the output of each filter for adjusting the electrical signal input to the amplifier for maintaining the input to the indicators at a level whereby the indicator means (lamps) can clearly show, by relative brightness, which type of device produced the audio sound and its relative intensity.

Description

United States Patent Inventor Maria L. M. Streb 3,412,378 11/1968 Thomas 340/34 pp No ga ls? Primary Examiner-Thomas B. Habecker Filed Mar- 1968 Attorney-Samuel R. Genca Patented Mar. 2, 1971 Assignee Dewar Products Corp.

Rochester ABSTRACT: A sound viewer apparatus is described, including means for receiving an audio signal and converting it into SOUND VIEWER APPARATUS an electrical signal, at least one amplifier for adjusting the in- 8 Claims, 2 Drawing pigs tens ty level of the electrical s1gnal; a plurality of filters, each havmg a bandpass corresponding to the ma or frequency US. Cl 340/34, Components f the audio signal produced by a particular 340/372340/171 device (viz a car engine, train whistle, horn or emergency Int. Cl G08g 1/09 vehicle siren); indicator means, such as lamps, connected to Fleld ofSearch u the output of the filters; and automatic gain control means R f d responsive to the output of each filter for adjusting the electrie erences I e cal signal input to the amplifier for maintaining the input to UNITED STATES PATENTS the indicators at a level whereby the indicator means (lamps) 3,014,199 12/1961 Dill 340/34 can clearly show, by relative brightness, which type of device 2/ 1966 Best 340/33 produced the audio sound and its relative intensity.

CONTROLLED GAIN DRIVERS TRANsougER AMPLIFIERS 22 GATES IND'CATORS u CHANNEL 200 I71: CHANNEL |6b 22b 20b b i f l l l |7n CHAIQINEL 22" 24H -65? 35 1 25 260 26b 26o I 32 a y l 28 I 341: I lATTENUATION I SUMMING l l I M A I sounn vmwnn APPARATUS The present invention relates to a sound discriminating apparatus and more particularly to a sound viewer apparatus by which is meant apparatus for monitoring audio signals such as a car engine, train whistle, horn or emergency vehicle siren, and visually indicating which of the signals is being received by the apparatus.

BACKGROUND OF THE INVENTION The automotive industry has made great strides in improving driver and passenger comfort'by insulating the driver and passengers from the effects of weather and outside noise. This is particularly notedin the case of air conditioned vehicles where, from a practical point of view, the car is generally sealed airtight. Although these improvements are laudable, from a comfort point of view, they create a safety hazard in that the driver and passengers may not be able to hear an oncoming train or other vehicles. Obviously, this problem is compounded in the case of hard-of-hearing people, and in fact, may have disastrous consequences at train crossings.

Recently enacted laws make it mandatory for motorcyclists to wear helmets. Thus the cyclist is also faced with the came problem mentioned heretofore. No known devices are available for cyclists to detect warning signals. 7

In view of the foregoing, it is an object of the present invention to provide a new sound viewer apparatus.

It is another object of the presentinvention to provide apparatus which detects and indicates the types of ambient audio signals and their relative intensity. I

It is still another object of the present invention to provide improved apparatus which permits a driver of an insulated vehicle or a driver with a helmet to see by means of an indicator the ambient noise being produced by devices such as a train, horn, siren, etc.

In accordance with one embodiment of the invention, there is provided a microphone which receives an audio signal and converts it into an electrical signal which in turn, is routed to a plurality of channels. Preferably each channel includes an amplifier, a filter, the band-pass of which corresponds to the major frequency band or signature of a particular audio producing device; and an indicator lamp connected to each filter for indicating which type of device produced the sound and its relative intensity or neamess.

One important feature of this invention is the means for adjusting the intensity of .the input signal to the filters so that differences in the relative output, brightness, or intensity of the indicators or lamps may be easily distinguished when several devices simultaneously produce a noise or audio signals.

Other objects and advantages of the present invention will become apparent from the ensuing description of an illustrative embodiment thereof in the course of which reference may be had to the accompanying drawings in which:

FIG. 1 is a perspective view of an indicator means utilized in the sound viewer apparatus of FIG. 2; and

FIG. 2 shows a preferred embodiment of the invention in schematic view receiving an audio signal and visually displaying the signal on the indicator means.

Turning to the drawing, a preferred embodiment of a sound viewer apparatus 10 is shown to include a broad-band transducer 12 such as a microphone, which receives an audio signal and produces an electrical signal having the same or corresponding frequency components found in the audio signal.

The transducer may be mounted on the roof of a vehicle or on the handlebars of a motorcycle. It should be understood that more than one transducer may be placed on the vehicle such as in the front and rear without departing from the invention. The electrical signal is applied as an input signal to a plurality of channels anby way of a lead 13. The lead 13 is shown partly in dotted line to indicate that there are a plurality of channels an, where n is the last channel. Each channel a- -n is similar in construction and includes amplifying means for amplifying the input signal such as corresponding controlled gain amplifiers 16 an.-

It should be understood that the amplifying means may comprise a single amplifier for amplifying the signal instead of n number of amplifiers. This of course may be cheaper to make without departing from the invention. The outputs of the amplifiers 16 an are applied to the input of corresponding filters 17 an which may be of the passive lumped constant variety in the audio range or of the active-type filters having transistors or the like for passing a particular frequency or pitch signature associated within the band-pass of the corresponding filter. The output of each of the filters 17 an is applied to corresponding driver amplifiers 22 an in the channels an respectively. The output of each of the driver amplifiers 22 an is applied to corresponding indicators 20 an through threshold gates 24 an. The threshold gates 24 an may be omitted if desired from each of the channels. However, it may be desirable to include the threshold gates 24 a- -n so that only one of the indicators 20 an is energized when a signal above a given voltage threshold is gated therethrough.

In accordance with the present invention, the band-pass of each filter 17 an is selected for a predetermined frequency or pitch signature. For example, the filter may have a band-pass for a train whistle (a high frequency band-pass) at a frequency fa while the filters 17 b-n may have selected bandpasses for a horn noise and a siren. It should be noted that some audio signals carry other frequencies and therefore may energize one or more lamps 20 an with varying intensity.

The lamps 20 an may be slightly energized due to the fact that some frequency components of a siren fb lie in the car horns frequency signature band fn. In order to prevent any ambiguity, the aforesaid threshold gates 24 an may be coupled between the drivers 22 an and the lamps 20 an so that a given signal above a voltage threshold will energize a corresponding one of the lamps 20 an.

The indicators or lamps 20 an may be fixed in a housing 40 (FIG. 2) which includes transparent panels 41-43 upon which is engraved the particular frequency upon which corresponding lamps 20 an are energized as shown in FIG. I. The transparent panels 41-43 may be colored if desired to provide ready indication of the warning signal, viz, siren, train whistle, car horn and the like. While only three panels 41-43 are shown, it should be understood, of course, that additional panels corresponding to the lamps 20 an may be provided. The frame 40 may be mounted on a dashboard 44 of a vehicle or on the handlebars of a motorcyclejThe housing 40 may also be mounted within the dashboard of a vehicle in a recess provided therein.

The sound viewer apparatus 10 further includes summing means 25 for summing the voltage output of each of the drivers 22 an. The summing means 25 includes a plurality of rectifiers or diodes 26 an which rectifies the output of each of the drivers 22 an and applies the output of the rectifier 26 an to a summing resistor 28. A DC blocking capacitor is provided at 30 between the output of the diodes 26 an and ground. The rectified output from the summing resistor 28 is applied to the base 32 of a transistor 33 in an attenuator means or circuit 35. The transistor 33 provides a low impedance gate between the output of the transducer 12 and ground through the lead 13. A DC blocking capacitor 34 is provided between the base 32 and ground. A variable resistor 36 is connected in parallel with the gating transistor 32 for adjusting the attenuation level of the attenuator circuit 35. A capacitor 37 is connected in series with the resistor 36 and the transistor 33.

Different sound producing devices develop characteristic sounds having most of their high intensity frequency components in different pitch or frequency bands. A siren, for example, will produce most of its higher intensity components at a higher frequency than will the noise produced by a running motor, horn or train whistle. Each type of sound emitting device can be thought of as having a frequency or pitch signature associated with some frequency band.

In the operation of the sound viewer apparatus 10, assuming a siren signal is received by the transducer 12, the siren signal is converted into a corresponding electrical signal having a corresponding frequency. The electrical signal is amplified and applied to each of the channels an. The siren signal passes through the assigned filter 17b while all other filters block the signal. The signal is then amplified and passed to the indicator or lamp 20b. In response to the signal the lamp 20b is energized and panel 42 is illuminated. The signal is also rectified by the diode 26b and the output is applied to the summing resistor 28 and then to the base 32 of the transistor 33 in the attenuator circuit 35. if the rectified signal has a high DC potential or is higher than a reference voltage, the normally closed or back-biased transistor 33 is turned on to provide a low impedance circuit between the transducer 12 and ground to thus decrease the signal output of the transducer. This is particularly important since some received signals may carry frequencies which may be passed by the other filters 17 an and thus energize some of the lamps 20 an to a lesser degree. By summing the DC output of the filters 17 a-n in the means 25 and applying the summed output to the attenuator circuit 35, the relative intensity of the lamps 20 an is maintained even for a very strong signal which may have different frequency components since part of the signal is shunted to ground by the transistor 33. By maintaining the relative strength ofthe signal by the means 25 and attenuator circuit 35, the threshold gates may thus pass only the desired highest strength signals from the filters 17 -11 and thus only those signals above a given voltage level will energize the lamps 20 an. The sound viewer apparatus also operates in the same manner for other received signals viz the train whistle and horn described herein.

While there has been shown and described what is considered at present to be the preferred embodiment of the invention, modifications thereto will readily occur to those skilled in the art. For example, the indicators 20 a--n may be other alarm devices such as horns instead of lamps or may in fact be a combination of both. It is not desired, therefore, that the invention be limited to the embodiment shown and described, and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of the invention.

Iclaim:

l. A sound apparatus for a vehicle for visually warning the presence of n different audio signals each of which have at least a particular frequency characteristic of a sound roducing device comprising:

a. a transducer means for converting said n different audio signals into corresponding electrical signal voltages having the same corresponding frequencies as said audio signals;

b. filter means having n different filters each having a predetermined band-pass for passing only those electrical signal voltages having a frequency lying within said predetermined band-pass therethrough;

. a plurality of corresponding n indicator means coupled to said n different filters for visually indicating the passage of said electrical signal voltages therethrough so that the presence of said audio signals is visually indicated thereby;

d. summing means connected to each of said n different filters for deriving a rectified signal voltage which is a function of the sum of said corresponding electrical signal voltages passed by said n different filters; and

e. attenuation means connected between said transducer means and said summing means for attenuating said corresponding electrical signal voltages when said rectified signal voltage is higher than a given reference voltage.

2. The invention defined in claim 1 wherein said attenuation means includes variable resistor means for selectively varying said reference voltage.

3. The invention defined in claim 1 wherein said attenuation means includes a transistor having a base electrode connected to said summing means for providing a low impedance switch between said transducer means and round.

4. The invention defined in claim wherein said attenuation means includes a transistor connected between ground and said transducer means for attenuating said corresponding electrical signal voltages to said indicator means in the same ratio as received by said transducer.

5. The invention defined in claim 1 wherein said filters are active band-pass filters.

6. The invention defined in claim 1 wherein said transducer means is a microphone mounted on said vehicle for receiving said audio signals outside of said vehicle.

7. The invention defined in claim 1 further including a plurality of n gating means each connected between a corresponding one of said filters and a corresponding one of said indicating means for passing only said electrical signal voltages above a given voltage level.

8. The invention defined in claim 1 wherein said summing means includes diodes means connected to said filter means and a summing resistor connected to said attenuation means for adjusting the intensity of said output signal voltages from said transducer means.

Claims (8)

1. A sound apparatus for a vehicle for visually warning the presence of n different audio signals each of which have at least a particular frequency characteristic of a sound producing device comprising: a. a transducer means for converting said n different audio signals into corresponding electrical signal voltages having the same corresponding frequencies as said audio signals; b. filter means having n different filters each having a predetermined band-pass for passing only those electrical signal voltages having a frequency lying within said predetermined band-pass therethrough; c. a plurality of corresponding n indicator means coupled to said n different filters for visually indicating the passage of said electrical signal voltages therethrough so that the presence of said audio signals is visually indicated thereby; d. summing means connected to each of said n different filters for deriving a rectified signal voltage which is a function of the sum of said corresponding electrical signal voltages passed by said n different filters; and e. attenuation means connected between said transducer means and said summing means for attenuating said corresponding electrical signal voltages when said rectified signal voltage is higher than a given reference voltage.
2. The invention defined in claim 1 wherein said attenuation means includes variable resistor means for selectively varying said reference voltage.
3. The invention defined in claim 1 wherein said attenuation means includes a transistor having a base electrode connected to said summing means for providing a low impedance switch between said transducer means and ground.
4. The invention defined in claim 1 wherein said attenuation means includes a transistor connected between ground and said transducer means for attenuating said corresponding electrical signal voltages to said indicator means in the same ratio as received by said transducer.
5. The invention defined in claim 1 wherein said filters are active band-pass filters.
6. The invention defined in claim 1 wherein said transducer means is a microphone mounted on said vehicle for receiving said audio signals outside of said vehicle.
7. The invention defined in claim 1 further including a plurality of n gating means each connected between a corresponding one of said filters and a corresponding one of said indicating means for passing only said electrical signal voltages above a given voltage level.
8. The invention defined in claim 1 wherein said summing means includes diodes means connected to said filter means and a summing resistor connected to said attenuation means for adjusting the intensity of said output signal voltages from said transducer means.
US3568144A 1968-03-14 1968-03-14 Sound viewer apparatus Expired - Lifetime US3568144A (en)

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735342A (en) * 1971-03-10 1973-05-22 Borge Inc Alerting system responsive to a plural tone signal
US3859623A (en) * 1973-01-10 1975-01-07 Lyle E Koehler Emergency signal warning system
US3867719A (en) * 1972-03-24 1975-02-18 John W Perrin Relative movement responsive siren alert
US3873963A (en) * 1973-01-05 1975-03-25 Joe L Neal Emergency vehicle warning system
US4158190A (en) * 1977-11-04 1979-06-12 Boris Stefanov Wailing siren detecting circuit
US4209769A (en) * 1978-10-16 1980-06-24 Chronerberry Jack E System for producing warning signals perceivable by an automobile driver in response to remote warning sounds
US4380004A (en) * 1981-03-19 1983-04-12 Coats Montgomery R Emergency sound detector device
US4617555A (en) * 1985-04-17 1986-10-14 Data Distribution Devices, Inc. Receiver for audible alarm
US4625206A (en) * 1982-04-05 1986-11-25 Richard W. Clark Sound pattern discrimination system
US5029216A (en) * 1989-06-09 1991-07-02 The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration Visual aid for the hearing impaired
WO1993007603A1 (en) * 1991-10-04 1993-04-15 Cornett Robert H Approaching emergency vehicle warning system
US6011492A (en) * 1998-06-30 2000-01-04 Garesche; Carl E. Vehicle warning system for visual communication of hazardous traffic conditions
US6744353B2 (en) 1999-12-15 2004-06-01 Sjoenell Goeran Blind spot detector
US20040196157A1 (en) * 2003-04-07 2004-10-07 Wen-Chien Lu Electroluminescent dashboard control circuit
US20060125654A1 (en) * 2004-12-01 2006-06-15 Jung-Huang Liao Vehicle accident warning system
US7099830B1 (en) * 2000-03-29 2006-08-29 At&T Corp. Effective deployment of temporal noise shaping (TNS) filters
WO2006107785A1 (en) * 2005-04-01 2006-10-12 Cepia, Llc System and method for extracting and conveying modulated ac signal information
US20060262529A1 (en) * 2005-04-01 2006-11-23 Hornsby James R System and method for extracting and conveying modulated AC signal information
US20070126563A1 (en) * 2004-02-02 2007-06-07 Goran Sjonell Vehicle collision detector
US20070161440A1 (en) * 2006-01-09 2007-07-12 Yen-Li Chang Ball structure
US7499851B1 (en) * 2000-03-29 2009-03-03 At&T Corp. System and method for deploying filters for processing signals
US7520633B2 (en) 2005-04-01 2009-04-21 Cepia, Llc Lighting and display apparatus
CN100556219C (en) 2005-04-01 2009-10-28 西皮亚有限公司 Device and method for extracting and conveying modulated AC signal information
US9224294B1 (en) * 2013-04-09 2015-12-29 Phyllis St. John Automobile emergency vehicle warning display system
GB2527610A (en) * 2014-04-17 2015-12-30 Continental Automotive Systems Method and apparatus to provide surroundings awareness using sound recognition

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Publication number Priority date Publication date Assignee Title
US3014199A (en) * 1960-04-11 1961-12-19 Leslie G Dill Siren actuated warning device for automobiles
US3233217A (en) * 1962-12-18 1966-02-01 William L Crandall Vehicle signal device
US3412378A (en) * 1962-04-27 1968-11-19 James R. Thomas Electronic warning device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014199A (en) * 1960-04-11 1961-12-19 Leslie G Dill Siren actuated warning device for automobiles
US3412378A (en) * 1962-04-27 1968-11-19 James R. Thomas Electronic warning device
US3233217A (en) * 1962-12-18 1966-02-01 William L Crandall Vehicle signal device

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735342A (en) * 1971-03-10 1973-05-22 Borge Inc Alerting system responsive to a plural tone signal
US3867719A (en) * 1972-03-24 1975-02-18 John W Perrin Relative movement responsive siren alert
US3873963A (en) * 1973-01-05 1975-03-25 Joe L Neal Emergency vehicle warning system
US3859623A (en) * 1973-01-10 1975-01-07 Lyle E Koehler Emergency signal warning system
US4158190A (en) * 1977-11-04 1979-06-12 Boris Stefanov Wailing siren detecting circuit
US4209769A (en) * 1978-10-16 1980-06-24 Chronerberry Jack E System for producing warning signals perceivable by an automobile driver in response to remote warning sounds
US4380004A (en) * 1981-03-19 1983-04-12 Coats Montgomery R Emergency sound detector device
US4625206A (en) * 1982-04-05 1986-11-25 Richard W. Clark Sound pattern discrimination system
US4617555A (en) * 1985-04-17 1986-10-14 Data Distribution Devices, Inc. Receiver for audible alarm
US5029216A (en) * 1989-06-09 1991-07-02 The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration Visual aid for the hearing impaired
WO1993007603A1 (en) * 1991-10-04 1993-04-15 Cornett Robert H Approaching emergency vehicle warning system
US5278553A (en) * 1991-10-04 1994-01-11 Robert H. Cornett Apparatus for warning of approaching emergency vehicle and method of warning motor vehicle operators of approaching emergency vehicles
US6011492A (en) * 1998-06-30 2000-01-04 Garesche; Carl E. Vehicle warning system for visual communication of hazardous traffic conditions
US6744353B2 (en) 1999-12-15 2004-06-01 Sjoenell Goeran Blind spot detector
US7970604B2 (en) 2000-03-29 2011-06-28 At&T Intellectual Property Ii, L.P. System and method for switching between a first filter and a second filter for a received audio signal
US7548790B1 (en) * 2000-03-29 2009-06-16 At&T Intellectual Property Ii, L.P. Effective deployment of temporal noise shaping (TNS) filters
US20090180645A1 (en) * 2000-03-29 2009-07-16 At&T Corp. System and method for deploying filters for processing signals
US7099830B1 (en) * 2000-03-29 2006-08-29 At&T Corp. Effective deployment of temporal noise shaping (TNS) filters
US7657426B1 (en) 2000-03-29 2010-02-02 At&T Intellectual Property Ii, L.P. System and method for deploying filters for processing signals
US7499851B1 (en) * 2000-03-29 2009-03-03 At&T Corp. System and method for deploying filters for processing signals
US6825772B2 (en) * 2003-04-07 2004-11-30 Wen-Chien Lu Electroluminescent dashboard control circuit
US20040196157A1 (en) * 2003-04-07 2004-10-07 Wen-Chien Lu Electroluminescent dashboard control circuit
USRE44331E1 (en) 2004-02-02 2013-07-02 Livy SRVCS, Limited Liability Company Vehicle collision detector
US7394355B2 (en) 2004-02-02 2008-07-01 Sjoenell Goeran Vehicle collision detector
US20070126563A1 (en) * 2004-02-02 2007-06-07 Goran Sjonell Vehicle collision detector
US20060125654A1 (en) * 2004-12-01 2006-06-15 Jung-Huang Liao Vehicle accident warning system
US7520633B2 (en) 2005-04-01 2009-04-21 Cepia, Llc Lighting and display apparatus
US20060262529A1 (en) * 2005-04-01 2006-11-23 Hornsby James R System and method for extracting and conveying modulated AC signal information
CN100556219C (en) 2005-04-01 2009-10-28 西皮亚有限公司 Device and method for extracting and conveying modulated AC signal information
WO2006107785A1 (en) * 2005-04-01 2006-10-12 Cepia, Llc System and method for extracting and conveying modulated ac signal information
US7825822B2 (en) 2005-04-01 2010-11-02 Cepia, Llc System and method for extracting and conveying modulated AC signal information
US20070161440A1 (en) * 2006-01-09 2007-07-12 Yen-Li Chang Ball structure
EP1841062A1 (en) * 2006-03-27 2007-10-03 Cepia, LLC System and method for extracting and conveying modulated AC signal information
US9224294B1 (en) * 2013-04-09 2015-12-29 Phyllis St. John Automobile emergency vehicle warning display system
GB2527610A (en) * 2014-04-17 2015-12-30 Continental Automotive Systems Method and apparatus to provide surroundings awareness using sound recognition
US9602937B2 (en) 2014-04-17 2017-03-21 Continental Automotive Systems, Inc. Method and apparatus to provide surroundings awareness using sound recognition

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