KR20040015563A - Apparatus for preventing noise of hands-free device for mobile phone in automobile and control method for preventing noise of said device - Google Patents

Abstract

PURPOSE: An apparatus for preventing the noise of a vehicle hands-free device and a method for controlling noise prevention are provided to prevent noise, generated in starting or driving, from flowing into a hands-free device. CONSTITUTION: A vehicle hands-free device consists of a portable terminal(10), a speaker(20), a microphone(30), an amplification part(40), a voice adjustment part(50), a filter part(60), a signal transfer part(70), and a control part(80). The portable terminal(10) outputs a voice signal, inputted from the other side when a call is connected, to the signal transfer part(70), and transmits a user's voice signal, inputted from the signal transfer part(70), to the other side. The speaker(20) outputs the other side's voice signal, outputted from the signal transfer part(70), as an audible-frequency voice signal. The microphone(30) converts the user's voice into an electrical voice signal and inputs it to the signal transfer part(70). The amplification part(40) amplifies the voice signals transmitted and received between the portable terminal(10), the speaker(20), and the microphone(30). The voice adjustment part(50) suitably adjusts the level of a voice signal amplified through the amplification part(40). The filter part(60) filters a noise component from the level-adjusted voice signal and supplies it to the signal transfer part(70). The control part(80) controls the functions of the vehicle hands-free device.

Description

Apparatus for preventing noise of hands-free device for mobile phone in automobile and control method for preventing noise of said device}

The present invention relates to a noise prevention device and a noise prevention control method of a vehicle hands free, and more particularly, a noise prevention device and noise of a vehicle hands free which can minimize the noise generated during startup or driving into the hands free during a call. It relates to a prevention control method.

In recent years, the rapid spread of personal mobile phones has resulted in an increase in the use rate of mobile phones in vehicles. Therefore, a large number of vehicle drivers exchange phone calls with the other party while the vehicle is in operation. At this time, the vehicle driver tries to talk with the other party while holding the steering wheel with one hand and the mobile phone terminal with the other hand. This distracts the driver's attention and threatens safe driving.

As a countermeasure against this, hands-free devices are provided that allow the driver to make a call without holding the body of the mobile terminal when using the mobile phone in the vehicle, thereby minimizing the possibility of a car accident on the road. It is getting popular and rapidly spreading, and is being released as a standard option in recently manufactured vehicles.

Such a vehicle hands-free device generally has a configuration as shown in FIG. 1.

As shown in Fig. 1, a conventional general vehicle hands-free device includes a mobile phone terminal 1, a speaker 2 and a microphone 3 installed in a vehicle interior, these mobile phone terminals 1 and a speaker ( 2) and an amplifier unit 4 for amplifying a voice signal transmitted and received between the microphone 3, a voice controller 5 for appropriately adjusting the level of the voice signal amplified by the amplifier unit 4, and a portable device. Control unit for controlling each function of the hands-free device and the signal switching unit 6 for switching voice signals between the telephone terminal 1, the speaker 2, the microphone 3, the amplifier unit 4, and the voice control unit 5 It consists of (7).

However, the vehicle hands-free device described above has a considerable amount of noise generated by the engine while the vehicle is running or the vehicle is running due to its spatial characteristics installed in the vehicle, and the noise is introduced into the hands-free device to generate noise in the call voice. There was a problem of degrading the call quality. For reference, FIGS. 2 and 3 illustrate waveforms of noise generated when the vehicle starts up and introduced into the hands-free device.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, a vehicle-free hands-free noise prevention device and noise prevention that can be prevented from flowing into the voice voice to the hands-free device generated during start-up or driving The purpose is to provide a control method.

1 is a schematic block diagram of a conventional general hands-free device for a vehicle;

2 is a waveform diagram of noise generated from an engine at startup and introduced into a hands-free device;

3 is a noise waveform diagram of an audible frequency band generated from an engine at startup and introduced into a hands-free device;

4 is a schematic block diagram of a vehicle hands-free device according to a preferred embodiment of the present invention;

FIG. 5 is a flowchart for describing an operation of the controller illustrated in FIG. 4;

6 is a waveform diagram of noise generated from an engine at start-up and introduced into a hands-free device according to the present invention;

7 is a noise waveform diagram of an audible frequency band generated from an engine at start-up and introduced into a hands-free device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: mobile phone terminal 20: speaker

30: microphone 40: amplifier

50: voice control unit 60: filter unit

70: signal switching unit 80: control unit

An apparatus for preventing noise of a vehicle hands-free according to the present invention for achieving the above object is a filter for removing noise components from a speech signal in a vehicle hands-free device for switching a voice signal between a mobile phone terminal and a speaker and a microphone in a vehicle. A control unit for generating a control signal for connecting or disconnecting a voice signal during a call through the filter unit according to a signal output from an electronic control unit for controlling a dynamometer of the vehicle and a signal applied from an ignition key; And a signal switching unit for switching input and output of a voice signal between the mobile phone terminal, the speaker, the microphone, and the filter unit according to a control signal applied from the control unit.

According to an aspect of the present invention, there is provided a method for controlling noise of a vehicle hands-free according to an embodiment of the present invention, in a method of controlling a vehicle hands-free device for switching a voice signal between a mobile phone terminal and a speaker and a microphone in a vehicle. Detecting whether a voice signal is output from the mobile phone terminal; and detecting whether the vehicle is in a driving state by a signal output from an electronic control unit controlling a dynamometer of the vehicle when the voice signal is output from the mobile phone terminal; And switching a signal such that a voice signal transmitted and received between the cellular phone terminal, the speaker, and the microphone passes through a filter when it is detected that the vehicle is in a driving state.

In accordance with another aspect of the present invention, there is provided a noise preventing control method for a vehicle hands-free device, the method for controlling a vehicle hands-free device for switching voice signals between a mobile phone terminal and a speaker and a microphone in a vehicle. Detecting whether a voice signal is output from the mobile phone terminal; and detecting whether a voice signal is being started by a signal output from an ignition key used to start the vehicle when the voice signal is output from the mobile phone terminal. And switching a signal such that a voice signal transmitted and received between the cellular phone terminal, the speaker, and the microphone passes through a filter when it is detected that the vehicle is starting up.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic block diagram of a vehicle hands-free device according to a preferred embodiment of the present invention. As can be seen from the same drawing, the vehicle hands-free device according to the present invention includes a mobile phone terminal 10 and a speaker 20. ), A microphone 30, an amplifier unit 40, a voice control unit 50, a filter unit 60, a signal switching unit 70, and a control unit 80.

The mobile phone terminal 10 outputs a voice signal from the call counterpart to the signal switching unit 70 when the call is connected, and transmits a voice signal of the user input from the signal switching unit 70 to the counterpart, and the speaker 20 outputs an audio signal of the call partner, output from the signal switching unit 70, as an audio signal of an audible frequency. For example, the speaker 20 may be a speaker for vehicle audio provided in a vehicle interior.

The microphone 30 is provided in the interior of the vehicle to convert the user's voice into an electrical voice signal to be input to the signal switching unit 30, the amplifier unit 40 is a mobile phone terminal 10 and the speaker 20 Amplifies a voice signal transmitted and received between the microphone 30 and the microphone 30.

The voice controller 50 properly adjusts the level of the voice signal amplified by the amplifier unit 40, and the filter unit 60 controls the noise component of the voice signal whose level is adjusted by the voice controller 50. Is filtered and applied to the signal switching unit 70.

The control unit 80 controls each function of the hands-free device, and in accordance with a signal output from an electronic control unit (“ECU”) that controls the dynamometer of the vehicle and a signal applied from an ignition key. The control signal for controlling the connection or disconnection of the voice signal during the call through the filter unit 60 is applied to the signal switching unit 70.

For reference, the above-described electronic control unit (ECU) is a device that is essentially installed in a general vehicle, and in addition to an engine dynamometer (engine, power train, etc.), each of the brake and suspension devices and various electric and electronic devices in the vehicle may be used. The ignition key is a switch operated by the driver to start the engine and outputs different signals in the standby state, the driving state, and the starting state. ECU) and ignition key are well known techniques known in the art, so a separate description thereof will be omitted.

An operation example of the present invention configured as described above will now be described in detail with reference to the accompanying drawings.

First, the controller 80 checks whether an on signal is output from the ignition key (S10). For reference, in a typical vehicle, when the user inserts the car key into the key holder and then rotates the car key one step clockwise or counterclockwise, an on signal is output from the ignition key, and each electric power is output from the battery of the vehicle. And a standby state in which power is supplied to the electronic equipment.

When the ON signal is output from the ignition key as a result of the check in step S10, the controller 80 controls the mobile phone terminal 10, the speaker 20, the microphone 30, the amplifier unit 40, and the voice control. A control signal for controlling the signal path between the unit 50 and the filter unit 60 to be reset to an initial state is applied to the signal switching unit 70 (S20).

According to a control signal applied from the control unit 80, the signal switching unit 70 is a mobile phone terminal 10, a speaker 20, a microphone 30, an amplifier unit 40, a voice control unit 50 and a filter The signal path between the units 60 is reset to an initial state.

For reference, in the initial state, a signal path is formed so that the voice signal during the call does not pass through the filter unit 60.

Next, the controller 80 checks whether the voice signal output from the mobile phone terminal 10 is input to the signal switching unit 70 (S30), and when it is detected that the voice signal is output from the mobile phone terminal 10. It is determined that the cellular phone terminal 10 is on.

If it is determined in step S30 that the cellular phone terminal 10 is turned on, the controller 80 checks whether a start signal is output from the ignition key (S40).

For reference, in a typical vehicle, when a user inserts a car key into a key holder and then rotates the car key one step clockwise or counterclockwise, it is in a standby state where power is supplied from the battery of the vehicle to each electric and electronic device. In this standby state, when the car key is rotated one more time clockwise or counterclockwise, it is in a start state in which power is applied from the battery of the vehicle to the starter of the engine.

When the start signal is outputted from the ignition key as a result of the check in step S40, the control unit 80 proceeds to step S60 below, whereas if the start signal is not output from the ignition key, the control unit 80 transmits from the electronic control unit ECU. It is checked whether a signal indicating that the vehicle is running is output (S50).

When a signal indicating that the vehicle is traveling is output from the electronic control unit ECU as a result of the check in step S50, the controller 80 signals a control signal for controlling the voice signal during the call to pass through the filter unit 60. If the signal indicating that the vehicle is driving is not output while the signal is applied to the switching unit 70 (S60), the control unit 80 controls the control signal not to pass through the filter unit 60. (70) (S65).

Next, the controller 80 applies a control signal for controlling the call voice to the signal switching unit 70 (S70).

In the signal switching unit 70 by the control signal applied from the control unit 80, the mobile phone terminal 10, the speaker 20, the microphone 30, the amplifier unit 40, and the voice control unit by the signal switching. By connecting the signal paths between the 50, communication between the user and the call partner is possible.

At this time, the signal switching unit 70 according to the control signal applied from the control unit 80 in the step (S60) or the step (S65), the voice control unit 50, the filter unit 60 and the mobile phone terminal 60 To form different signal paths between In other words, the signal switching unit 70 inputs a signal output from the voice controller 50 and passed through the filter unit 60 to the cellular phone terminal 10 according to a control signal applied from the controller 80, The signal is switched so that the signal output from the voice controller 50 is input directly to the cellular phone terminal 10 without passing through the filter unit 60.

That is, when the engine is started or the vehicle is running, the voice signal is passed through the filter unit 60 to filter the noise generated from the engine and flow into the hands free to improve the call quality.

For reference, FIG. 6 is a waveform diagram of noise generated from an engine at start-up and introduced into the hands-free device according to the present invention, and FIG. 7 is an audio frequency band generated from the engine at start-up and introduced into the hands-free device according to the present invention. As a noise waveform diagram, referring to FIG. 6 and FIG. 7, it can be seen that noise generated from the engine during start-up or driving while flowing into the hands-free abruptly is attenuated by the filtering action of the filter unit 60. .

Next, the controller 80 checks whether or not the output of the voice signal is stopped from the mobile phone terminal 10 to the signal switching unit 70 (S80), and outputs the voice signal from the mobile phone terminal 10 as a result of the check. If so, it is determined that the cellular phone terminal 10 is in an on state, and the flow returns to step S70 to maintain the call state.

If the output of the voice signal is stopped from the mobile phone terminal 10 as a result of the check in step S80, the controller 80 determines that the mobile phone terminal 10 is turned off and the mobile phone terminal ( 10) and a control signal for controlling to block the signal path between the speaker 20 and the microphone 30 is applied to the signal switching unit 70 (S90).

In response to a control signal applied from the controller 80, the signal switching unit 70 interrupts a call connection by cutting off a signal path between the mobile phone terminal 10, the speaker 20, and the microphone 30 by signal switching. do.

The present invention is described above by illustrating specific embodiments, but the present invention is not limited to the above embodiments. Those skilled in the art can easily make various changes and modifications to the present invention, and it should be noted that such variations or modifications are included within the scope of the present invention as long as the features of the present invention are used.

As described above, the present invention filters the noise by passing the audio signal through the filter unit during start-up or driving, thereby reducing the noise generated from the engine of the vehicle during the start-up or driving, and flowing into the hands-free device to improve the call quality. It can be effective.

Claims (3)

In the vehicle hands-free device for switching the voice signal between the mobile phone terminal and the speaker and the microphone in the vehicle, A filter unit for removing noise components from an audio signal, A control unit for generating a control signal for connecting or disconnecting a voice signal during a call through the filter unit according to a signal output from an electronic control unit controlling a vehicle dynamometer and a signal applied from an ignition key; And a signal switching unit for switching an input / output of a voice signal between the mobile phone terminal, the speaker, the microphone, and the filter unit according to a control signal applied from the control unit. In the method for controlling a vehicle hands-free device for switching the voice signal between the mobile phone terminal and the speaker and the microphone in the vehicle, Detecting whether a voice signal is output from the cellular phone terminal; When the voice signal is output from the mobile phone terminal, detecting whether the vehicle is in a driving state by a signal output from the electronic control unit controlling the vehicle dynamometer; And a step of switching a signal so that a voice signal transmitted and received between the cellular phone terminal, the speaker, and the microphone passes through a filter when the vehicle is detected to be driving. In the method of controlling a vehicle hands-free device for switching the voice signal between the mobile phone terminal and the speaker and the microphone in the vehicle, Detecting whether a voice signal is output from the cellular phone terminal; Detecting whether the vehicle is being started by a signal output from an ignition key used to start the vehicle when a voice signal is output from the mobile phone terminal; And a step of switching a signal such that a voice signal transmitted and received between the cellular phone terminal, the speaker, and the microphone passes through a filter when it is detected that the vehicle is starting up.