KR20130084794A - Hands free apparatus for vehicle and control method thereof - Google Patents

Hands free apparatus for vehicle and control method thereof Download PDF

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Publication number
KR20130084794A
KR20130084794A KR1020120005640A KR20120005640A KR20130084794A KR 20130084794 A KR20130084794 A KR 20130084794A KR 1020120005640 A KR1020120005640 A KR 1020120005640A KR 20120005640 A KR20120005640 A KR 20120005640A KR 20130084794 A KR20130084794 A KR 20130084794A
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KR
South Korea
Prior art keywords
signal
driver
seat
gain
microphone
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KR1020120005640A
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Korean (ko)
Inventor
권민호
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현대모비스 주식회사
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Priority to KR1020120005640A priority Critical patent/KR20130084794A/en
Publication of KR20130084794A publication Critical patent/KR20130084794A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H04M1/6075—Portable telephones adapted for handsfree use adapted for handsfree use in a vehicle
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)

Abstract

PURPOSE: A hands-free system for vehicles and a controlling method thereof are provided to control a signal level in an audio signal inputted to a microphone according to changes of a position of a driver's seat without installing a separate microphone moving unit in case the position of the driver's seat is changed. CONSTITUTION: An electronic control unit (ECU) (120) receives a signal. The ECU outputs position information of a driver's seat corresponding to the signal. A head unit (130) receives the position information of the driver's seat. The head unit controls a signal level in an audio signal inputted through a microphone based on the position information of the driver's seat. The head unit converts the audio signal to an audio signal with a predetermined signal level. The head unit transmits the converted audio signal to a mobile communication terminal in which is connected. [Reference numerals] (110) Sensor for sensing a position of a driver's seat; (133) Bluetooth module; (200) Mobile communication terminal; (AA) Input advantage controller; (BB) Transmitting signal processor; (CC) Receiving signal processor

Description

HANDS FREE APPARATUS FOR VEHICLE AND CONTROL METHOD THEREOF}

The present invention relates to a vehicle hands-free system. More particularly, the present invention relates to a vehicle hands-free system and a control method thereof, which can adaptively adjust the size of a driver's voice signal input through a microphone during a hands-free call according to a change in a driver's seat. will be.

In general, the microphone included in the vehicle hands-free system is fixedly mounted at a specific position inside the vehicle to receive the driver's voice.

By the way, while the microphone of the hands-free system is fixed at a specific position, the position of the driver's seat of the vehicle is changed to the front or rear of the vehicle by manipulation according to the driver's height and driving tendency.

When the position of the driver's seat is changed by the driver's operation, the distance between the driver's seat and the microphone is also changed. As a result, the signal level of the voice signal of the driver input into the microphone during hands-free communication also changes according to the change in the position of the driver's seat.

That is, when the driver's seat is close to the microphone, the signal level of the driver's voice signal input to the microphone becomes relatively large and is transmitted to the call partner, and when the driver's seat is too far from the microphone, the signal level of the driver's voice signal is input to the microphone. Becomes relatively small and is communicated to the other party.

As a method for solving such a problem, a technique of changing the position of the microphone according to the position of the driver's seat has been studied in the related art by mounting the hands-free microphone on the ceiling inside the vehicle as illustrated in FIG. 1.

The hands-free system including the conventional microphone moving device shown in FIG. 1 senses the position of the driver's seat using the sensor 1 installed in the driver's seat and transmits it to the control unit of the head unit 2, and controls the head unit 2. The distance between the driver's seat and the microphone was kept constant by driving the microphone moving unit 3 on the basis of changing the position of the microphone 4.

However, the hands-free system shown in FIG. 1 has a difficulty in installing inside the vehicle due to the limitation of the position for installing the microphone 4 when the microphone moving unit 3 is used. In addition, since a separate mechanical mobile unit 3 has to be manufactured in order to move the microphone 4, there is a problem that a lot of costs are required.

Therefore, the problem to be solved by the present invention is hands-free communication by adaptively adjusting the signal level of the audio signal input to the microphone according to the change of the driver's seat even when the driver's seat position of the vehicle is changed, without having a separate microphone moving unit. The present invention provides a hands-free system for a vehicle and a method of controlling the same, which can maintain a constant signal level of a voice transmitted to a call partner.

A hands-free system for a vehicle according to an embodiment of the present invention may include: a sensor for detecting a position of a driver's seat and outputting a detection signal corresponding to a corresponding position; An ECU which receives the detection signal and outputs driver's seat position information corresponding to the received detection signal; And receiving the driver's seat position information, and adaptively adjusting the signal level of the voice signal input through the microphone to a voice signal having a signal level set by adaptively adjusting the driver's seat position information to a connected mobile communication terminal. It includes a head unit.

A vehicle hands-free system control method according to an exemplary embodiment of the present invention includes detecting a position of a driver's seat and outputting a detection signal corresponding to a corresponding position; Receiving the sensing signal and outputting driver's seat position information corresponding to the received sensing signal; Receiving the driver's seat position information and adaptively adjusting a signal level of a voice signal input through the microphone to convert the signal level into a set signal level based on the received driver's seat position information; And converting the converted voice signal into a hands-free protocol and transmitting the same to a connected mobile communication terminal.

A vehicle hands-free system and a control method thereof according to an embodiment of the present invention have an effect of reducing costs by not having a separate microphone moving unit even when a driver's seat position is changed.

In addition, a vehicle hands-free system and a control method thereof according to an embodiment of the present invention, by adaptively adjusting the signal level of the micro-input voice signal according to the change in the position of the driver's seat, the signal level of the voice signal transmitted to the call partner during hands-free communication. It is effective to keep it constant.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more fully understand the drawings recited in the detailed description of the invention, a brief description of each drawing is provided.
1 is a view showing a hands-free system including a conventional microphone moving device.
2 is a diagram illustrating a hands-free system according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a digital signal processor (DSP) shown in FIG. 2.
4 is a view for explaining a change in the output level of the voice signal according to the position of the driver's seat according to an embodiment of the present invention.
5 is a flowchart illustrating a hands-free system control method according to an exemplary embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the embodiments of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

2 is a block diagram illustrating a vehicle hands-free system according to an exemplary embodiment of the present invention, FIG. 3 is a block diagram illustrating a digital signal processor (DSP) illustrated in FIG. 2, and FIG. 4 is a driver's seat according to an exemplary embodiment of the present invention. The figure for explaining the change of the output level of the audio signal according to the position of.

Referring to FIG. 2, the hands free system 100 includes a detection sensor 110, an ECU 120, and a head unit 130.

The sensor 110 detects the movement of the driver's seat and the position of the driver's seat and outputs a detection signal corresponding to the corresponding position to the ECU 120.

The ECU 120 determines the position of the driver's seat based on the detection signal input from the sensor 110 and transmits the position information of the driver's seat to the head unit 130.

The head unit 130 receives the driver's seat position information input from the ECU 120, and adaptively adjusts the gain of the voice signal input through the microphone 140 according to the position information of the driver's seat. The voice signal is converted into a voice signal having a set signal level and transmitted to the connected mobile communication terminal 200.

The head unit 130 includes a CPU 131, a DSP 132, and a Bluetooth module 133.

The CPU 131 receives driver's seat position information input from the ECU 120 and outputs a gain correction value corresponding to the driver's seat position information to the DSP 132.

For example, as shown in FIG. 4, when the driver's seat position information input from the ECU 120 is the position information for the second position, the CPU 131 determines that 3 [db] corresponds to the second position information. When the driver's seat position information input to the DSP 132 or the driver's seat position information input from the ECU 120 is position information for position 3, the CPU 131 corresponds to the position 3 position information. A gain correction value of 6 [db] is output to the DSP 132.

The DSP 132 replaces the preset gain correction value with the gain correction value output from the CPU 131 and resets the gain correction value. When the reset is completed, the DSP 132 outputs completion information to the CPU 131.

For example, when the position of the driver's seat is changed by the driver's operation and the positional information input from the ECU 120 is changed from the first to the second, the DSP 132 is set to a preset gain correction value of 0 [. db] is reset to 3 [db], which is a gain correction value input from the CPU 131, or if the position information input from the ECU 132 is changed from 1 to 3, the DSP 132 The preset gain correction value 0 [db] is reset to 6 [db] which is a gain correction value input from the CPU 131. FIG.

After that, when the reset of the gain correction value is completed, the DSP 132 corrects and outputs the gain of the voice signal input through the microphone 140 by the reset gain correction value.

For example, as shown in FIG. 4, when the driver's seat is located at position 2 and the signal level of the audio signal input through the microphone 140 is -32 [db], the gain correction value corresponding to position 2 is 3; Corrected by [db], an audio signal having a signal level of -29 [db] is output. Alternatively, when the driver's seat is located at position 3 and the signal level of the voice signal input through the microphone 140 is -35 [db], the driver's seat is corrected by 6 [db], which is a gain correction value corresponding to position 3,- An audio signal having a signal level of 29 [db] is output.

As a result, the signal level of the voice signal input to the microphone 140 at different signal levels according to the position of the driver's seat is adaptively adjusted according to the distance change caused by the movement of the driver's seat, thereby correcting and outputting the voice signal having a constant signal level. do.

Then, the DSP 132 performs a signal processing of acoustic echo removal and noise attenuation of the voice signal whose gain has been corrected according to the position information of the driver's seat, and then amplifies the gain by the set gain. Will output That is, as illustrated in FIG. 4, the signal level (-29 [db]) of the gain-compensated voice signal according to the distance between the driver's seat and the microphone is amplified by 26 [db], which is a set gain value, and then -6 [db]. A voice signal having a signal level of] is output to the Bluetooth module 133. As a result, even if the position of the driver's seat changes, it is transmitted to the Bluetooth module 133 at a predetermined signal level.

The Bluetooth module 133 converts the voice signal output from the DSP 132 into a hands-free protocol and transmits it to the connected mobile communication terminal 200.

The DSP 132 will be described in more detail with reference to FIG. 3. The DSP 132 includes an input gain control unit 10, a transmission signal processing unit 20, and a reception signal processing unit 30.

The input gain control unit 10 receives the gain correction value input from the CPU 120, replaces the preset gain correction value, and resets the gain correction value, and resets the gain of the voice signal input through the microphone 140. The primary gain is adjusted by the reset gain correction value and output.

The transmission signal processing unit 20 includes an acoustic echo removing unit 21, a transmission noise attenuation unit 22, a transmission automatic gain control unit 23, and a transmission equalizer control unit 24.

The acoustic echo removing unit 21 and the transmission noise canceling unit 22 receive a primary gain-adjusted voice signal input from the input gain control unit 10 to perform signal processing of acoustic echo removing and noise reduction. .

The transmission automatic gain control unit 23 receives the sound signal processed by the acoustic echo cancellation and noise reduction signal, and converts the sound signal having the set signal level by controlling the secondary gain by the set gain value.

The transmission equalizer controller 24 adjusts the equalizer of the second gain-adjusted voice signal and outputs the equalized to the Bluetooth module 133.

The reception signal processing unit 30 includes a reception noise reduction unit 31, a reception equalizer control unit 32, a reception automatic gain control unit 33, and a volume control unit 34, and are input through the Bluetooth module 133. Signal processing of attenuating noise, equalizer adjustment, gain adjustment, and volume control is sequentially performed on the received voice signal of the call partner and output to the speaker 150 of the vehicle.

5 is a view for explaining a gain control method of a hands-free system of a vehicle according to an embodiment of the present invention.

2 to 5, when the hands-free call is started, the detection sensor 110 mounted on the driver's seat detects the position of the driver's seat and outputs a detection signal to the ECU 120 (S110).

When the detection signal of the driver's seat is input from the detection sensor 110, the ECU 120 outputs driver's seat position information corresponding to the received detection signal to the CPU 131 based on the detection signal signal (S120).

When the driver's seat position information is input from the ECU 120, the CPU 131 transmits a gain correction value corresponding to the driver's seat position information to the DSP 132 (S130).

When the gain correction value corresponding to the driver's seat position information is input from the CPU 131, the DSP 132 replaces the preset gain correction value with the gain correction value input from the CPU 131 and resets the gain correction value. In addition, when the reset of the gain correction value is completed, the gain of the voice signal input through the microphone is adjusted by the primary gain as much as the reset gain correction value (S140).

Next, the DSP 132 performs acoustic echo removal and noise reduction signal processing on the primary gain-adjusted voice signal, and then converts the signal to a set signal level by controlling the secondary gain and outputs the converted signal level to the Bluetooth module 133. (S150-S160).

The Bluetooth module 133 converts the received voice signal into a hands-free protocol and transmits it to the mobile communication terminal 200 connected with the call (S170).

As described above, even if the position of the driver's seat is changed by the driver's operation, by adjusting the gain of the voice signal input through the microphone according to the changed position of the driver's seat, the signal level of the hands-free call voice is made constant. Improve call quality

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: Hands free system 110: Driver position sensor
120: ECU 130: head unit
131: CPU 132: DSP
133: Bluetooth module 10: input gain control unit
20: transmission signal processing unit 30: reception signal processing unit

Claims (6)

A sensing sensor for sensing a position of a driver's seat and outputting a sensing signal corresponding to a corresponding position;
An ECU which receives the detection signal and outputs driver's seat position information corresponding to the received detection signal; And
Receiving the driver's seat position information, the signal level of the voice signal input through the microphone is adaptively adjusted based on the driver's seat position information, converted into a voice signal having a set signal level, and transmitted to the connected mobile communication terminal. Vehicles hands-free call system comprising a head unit. The method of claim 1,
The head unit,
A CPU configured to receive the driver's seat position information, calculate a distance between the driver's seat and the microphone, and output a gain correction value corresponding to the distance between the driver's seat and the microphone;
The preset gain correction value is reset to the gain correction value output from the CPU, the gain of the voice signal input through the microphone is corrected by the reset gain correction value, and then converted into a voice signal having a set signal level. A signal processor; And
And a Bluetooth module for converting a voice signal output from the signal processor into a hands-free protocol and transmitting the converted voice signal to a connected mobile communication terminal. The method of claim 2,
The signal processing unit,
An input gain control unit for controlling a primary gain of the voice signal input from the microphone by the reset gain correction value;
A transmission signal processor for converting the gain-adjusted voice signal into a signal level set by performing secondary gain control after acoustic echo removal and noise reduction signal processing; And
And a reception signal processor for amplifying a voice signal of a call counterpart input through the Bluetooth module to a noise level and a predetermined level, and outputting the same to a speaker. Sensing the position of the driver's seat and outputting a detection signal corresponding to the corresponding position;
Receiving the sensing signal and outputting driver's seat position information corresponding to the received sensing signal;
Receiving the driver's seat position information and adaptively adjusting a signal level of a voice signal input through the microphone to convert the signal level into a set signal level based on the received driver's seat position information; And
Converting the converted voice signal into a hands-free protocol and transmitting the converted voice signal to a connected mobile communication terminal. The method of claim 1,
The step of converting and outputting to the set signal level,
Outputting a gain correction value corresponding to the received driver's seat position information; And
And replacing and resetting a preset gain correction value with the output gain correction value, and controlling and outputting the gain of the audio signal input from the microphone by the first gain by the reset gain correction value. . The method of claim 5,
The step of converting and outputting to the set signal level,
Receiving a first gain-adjusted voice signal by the gain correction value to perform acoustic echo cancellation and noise reduction signal processing; And
And converting the signal-processed voice signal into a set signal level by controlling a second gain and outputting the converted signal level.
KR1020120005640A 2012-01-18 2012-01-18 Hands free apparatus for vehicle and control method thereof KR20130084794A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150047981A (en) * 2013-10-25 2015-05-06 현대모비스 주식회사 Apparatus and method for controlling beam forming microphones considering location of driver seat
KR20160080633A (en) * 2014-12-30 2016-07-08 인포뱅크 주식회사 A terminal for noise reduction and method of operating the same
WO2018131938A1 (en) * 2017-01-12 2018-07-19 삼성전자주식회사 Electronic device and method for controlling call function

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150047981A (en) * 2013-10-25 2015-05-06 현대모비스 주식회사 Apparatus and method for controlling beam forming microphones considering location of driver seat
KR20160080633A (en) * 2014-12-30 2016-07-08 인포뱅크 주식회사 A terminal for noise reduction and method of operating the same
WO2018131938A1 (en) * 2017-01-12 2018-07-19 삼성전자주식회사 Electronic device and method for controlling call function
KR20180083161A (en) * 2017-01-12 2018-07-20 삼성전자주식회사 Electronic device and method for controlling call functionality
US20190373094A1 (en) * 2017-01-12 2019-12-05 Samsung Electronics Co., Ltd. Electronic device and method for controlling call function
US10863015B2 (en) 2017-01-12 2020-12-08 Samsung Electronics Co., Ltd. Electronic device and method for controlling call function

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