KR200229962Y1 - Wireless hands free system - Google Patents

Abstract

The present invention relates to a wireless hands-free system for facilitating the user's use of a mobile communication terminal by adaptively performing an automatic response function according to the use state of the mobile communication terminal. The present invention has a mobile communication terminal having an audio jack, a wireless hands-free mother device electrically connected through an audio jack of the mobile communication terminal, and a wireless hands-free mother side capable of wireless two-way communication with the mother device. A wireless hands-free system composed of devices, which facilitates a user's use of a mobile communication terminal and can warn a user of leaving the vehicle while leaving the mobile communication terminal in a vehicle.

Description

Wireless hands free system {WIRELESS HANDS FREE SYSTEM}

The present invention relates to a wireless hands-free system, and more particularly, to a wireless hands-free system for facilitating use of a mobile communication terminal by adaptively performing an autoresponding function according to a use state of the mobile communication terminal.

Recently, as mobile communication terminals such as mobile communication terminals are widely used, the use of mobile communication terminals while driving a vehicle has emerged as a major cause of traffic accidents. For this reason, a hands-free system has been developed and commercialized so that calls can be made using speakers and microphones installed in a vehicle without using a hand.

Normally, the hands-free system is equipped with an automatic answering function that automatically enters a call state by answering an incoming call even if the user does not touch it. This automatic answering function causes a difficulty in using the hands-free system because it automatically responds to incoming calls irrespective of the state of use of the mobile communication terminal. That is, if an incoming call occurs while the user is dialing through the mobile communication terminal, the conventional hands-free system automatically responds regardless of the user's dialing, thereby impairing the user's dialing.

In addition, since a hands free system is usually provided in a vehicle, a mobile communication terminal is frequently left in a vehicle due to user's carelessness. Accordingly, in the related art, when the user moves in the vehicle while the mobile communication terminal is left in the vehicle, there is no way of knowing this.

Accordingly, an object of the present invention is to provide a wireless hands-free system that facilitates the user's use of a mobile communication terminal by automatically performing an automatic response function according to the use state of the mobile communication terminal.

Another object of the present invention is to provide a wireless hands-free system which can warn the user of leaving the vehicle while leaving the mobile communication terminal in the vehicle.

1 is a block diagram of a wireless hands-free system according to an embodiment of the present invention.

2 is a block diagram of a mother device of a wireless hands-free system according to a preferred embodiment of the present invention.

3 is a block diagram of a magnetic measuring device of a wireless hands-free system according to a preferred embodiment of the present invention.

4 is a control flow diagram of a mother device according to a preferred embodiment of the present invention.

5 is a control flow diagram of the magnetic measuring device according to an embodiment of the present invention.

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

100: mother antenna 102: mother receiving signal processing unit

104: mother-side receiver 106: mother-side demodulator

108: mother amplifier 110: reception state selection unit

112: mother power switch 114: audio monitoring unit

116: DTMF monitoring unit 118: mobile communication terminal connection unit

120: mother transmission signal processing unit 122: mother transmission amplifier

124: mother-side modulator 126: mother-side transmitter

128: mother display unit 130: mother power saving control unit

132: mother microprocessor 134: mobile communication terminal connection / alarm unit

136: mother speaker 138: mother channel selector

140: voltage stabilizer 142: charging circuit

144: spare battery 146: charge state display unit

148: power supply unit 200: magnetic antenna

202: Self-received signal processor 204: Self-received receiver

206: self demodulation 208: volume control

210: audio amplifier 212: earphone connection

214: speaker output unit 216: output amplifier

218: magnetic speaker 220: gain control unit

222: receiving switch 224: output selection switch

226: magnetic channel microprocessor 227: magnetic channel selector

228: magnetic measurement display 230: magnetic sleep control unit

234: microphone input

236: microphone 238: microphone amplifier

240: self-transmission signal processing unit 242: self-modulating unit

244: magnetic side transmitter 246: magnetic side battery

248: magnetic power switch 250: DC-DC converter

252: battery detection unit 254: battery status display unit

HF: Hands free system A: Maternity unit

B: Self-measuring device T: Mobile communication terminal

The present invention for achieving the above object is a mobile communication terminal having an audio jack, a wireless hands-free mother device electrically connected through the audio jack of the mobile communication terminal, and can perform two-way communication wirelessly with the mother device In the wireless hands-free system composed of the wireless hands-free device of the present invention,

The mother apparatus includes a signal discrimination unit for determining a signal received from the audio jack, a reception state selection unit for selecting the mobile communication terminal as a reception state or a signal transmission state according to the type of the determined signal; A mother modulator that modulates an input signal to transmit the input signal to the mother apparatus, a mother channel selector that selects an available channel of the mother side to transmit the modulated signal to the mother apparatus, and the modulation A mother transmitter for transmitting the input signal to the mother apparatus through a selected channel, a mother receiver for receiving a signal from the mother apparatus, a mother demodulator for demodulating the signal received through the mother receiver, and the signal discrimination unit. And a central processing unit for controlling a reception state selection unit and the like, and a signal input / output signal to a mobile communication terminal in combination with the audio jack. Audio plugs to enable

The self-measurement apparatus may include: a self-determining unit receiving a signal from the mother unit, a self-demodulating unit demodulating the signal received through the self-receiving unit, an output unit converting the demodulated signal into an audio signal and outputting the audio signal; A microphone for receiving voice and converting the voice signal into a voice signal, a self modulator for modulating the voice signal from the microphone to the mother device, and a usable channel for transmitting the modulated signal to the mother device It is characterized in that it comprises a self-channel selection unit for selecting a, a self-transmitting unit for transmitting the modulated signal to the mother device through the selected channel, and a magnetic central processing unit for controlling the overall control.

The wireless hands-free system HF as described above will be schematically described with reference to FIGS. The wireless hands-free system HF according to the preferred embodiment of the present invention is largely composed of a mother device A and a mother device B as shown in FIG. 1. The mother device (A) is provided with a cradle for mounting the mobile communication terminal (T), after the user has mounted the mobile communication terminal (T) after the mobile terminal connection portion that can be a microphone jack and plug, etc. ( 118 through the mother device (A) and the mobile communication terminal (T) can be connected.

The mother device (A) converts a signal output from the mobile communication terminal (T) into a wireless signal and transmits the signal to the own device (B), and wirelessly receives a signal received from the mobile device (B) by the mobile communication terminal (T). To provide. The magnetic measuring device (B) is provided with a magnetic speaker 218 and a microphone 236 to restore the radio signal provided by the mother device (A) to a voice signal to output to the magnetic speaker 218, the user inputs The voice is converted into a radio signal and transmitted to the mother device (A).

The mother device (A) and the mother device (B) is provided with a plurality of radio channels for wireless connection. The mother device (A) and the mother device (B) automatically switches the channel when the quality of the transmitted / received signal is degraded or interference is generated, so that the user can always be provided with a high quality call service.

That is, the wireless hands-free system (HF) is a mobile communication terminal (T) having an audio jack, a wireless hands-free mother device (A) electrically connected via an audio jack of the mobile communication terminal (T), and the mother side And a wireless hands-free self-measurement device (B) capable of two-way communication with the device (A), wherein the mother-side device (A) comprises signal discriminating units (114, 116) for discriminating a signal received from the audio jack; Receiving state selection unit 110 to put the mobile communication terminal (T) in the receiving state or to select the signal transmission state according to the type of the determined signal, and to transmit the input signal to the own device (B) A mother modulator 124 for modulating an input signal, a mother channel selector 138 for selecting a usable channel of the mother to transmit the modulated signal to the own apparatus B, and the modulated input Signal to the selected channel. A mother transmitter (126) for transmitting to the mother device (B), a mother receiver (104) for receiving a signal from the mother device (B), and a demodulated signal received through the mother receiver (104) A mother demodulation unit 106, a mother central processing unit 132 for controlling the signal discriminating units 114 and 116, a reception state selecting unit 110, and the like, and a signal with a mobile communication terminal T in combination with the audio jack. And a mobile communication terminal connecting portion 118 made of an audio plug or the like which enables input / output.

In addition, the self-measurement apparatus B includes a self-determining receiver 204 for receiving a signal from the mother-side apparatus A, an autonomous demodulator 206 for demodulating a signal received through the autonomous receiver 204, and the demodulation. Output units 212 and 214 for converting and outputting the converted signals into audio signals, a microphone 236 for receiving the voice and converting the voice signal into a voice signal, and transmitting the voice signal from the microphone 236 to the mother device A. FIG. The self-modulating unit 242 for modulating, the self-channel selecting unit 227 for selecting an available channel of the mother-side to transmit the modulated signal to the mother-device A, and A self-transmitting unit 244 for transmitting to the mother unit (A) through the selected channel, and a self-centering processing unit 226 for controlling the overall parts.

Detailed configuration and operation of the mother device A of the wireless hands-free system HF will be described in detail with reference to FIG. 2. The mother reception signal processing unit 102 includes a mother reception unit 104, a mother modulation unit 106, and a reception amplifier 108. The mother receiver 104 receives, amplifies and demodulates an RF (Radio Frequence) signal transmitted from the own apparatus B through the antenna 100 and provides it to the mother modulator 106. The mother demodulator 106 demodulates the received signal and provides it to the mother amplifier amplification unit 108. The mother amplifier 108 amplifies the demodulated signal and provides it to the audio monitoring unit 114, the mobile communication terminal connection unit 118, and the like. The mobile communication terminal connection unit 118 connects the mobile communication terminal (T) and the mother device (A), and the mobile communication terminal connection unit 118 is a plug that can be coupled to the ear microphone connection jack that is usually provided in a mobile phone, etc. Can be In addition, when a signal received during a call is output to a speaker, a part of the voice is input back to the microphone and echoed back to the other party's ear, so that a normal call is difficult. In order to minimize such a phenomenon, the reception gain control unit 151, the transmission gain control unit 152, and the reception gain control unit receive the amplified signal input from the mother amplifier 102 and the mother transmitter amplifier 122 ( 151 and a voice level detection unit 150 for detecting a voice level from the transmission gain control unit 152 and transmitting a gain control signal to the reception gain control unit 151 and the transmission gain control unit 152 according to the detected signal size. By adjusting the gain by adding a ringing prevention circuit consisting of) to prevent howling (when the volume of the loudspeaker is loudly beeped). In order to prevent this, it is possible to reduce the speaker volume or reduce the input sensitivity of the microphone to prevent this from happening. In order to minimize the echo and increase the sensitivity of transmission and reception by automatically adjusting the sound volume, it is possible to increase the gain on the receiver side and reduce the gain on the receiver side when speaking, and to increase the gain on the receiver side when listening. As a way to reduce the gain, this is already the circuit used in speakerphones or handsfree for landline phones.

The various signals provided from the mobile communication terminal T through the mobile terminal connection unit 118 include an audio monitoring unit 114 and a DDT (hereinafter referred to as DTMF) monitoring unit 116. ), And is provided to the mother transmission signal processing unit 120. The audio monitoring unit 114 detects a ring signal, a voice signal, and the like from an audio signal provided from the mobile communication terminal T and provides the same to the mother microprocessor 132. The DTMF monitoring unit 116 detects the presence of DTMF in the signal provided from the mobile communication terminal T and provides the detection result to the mother microprocessor 132. The mother transmission signal processor 120 includes a mother transmission amplifier 122, a mother modulator 124, and a mother transmission unit 126. The mother transmission amplifier 122 amplifies the signal provided from the mobile communication terminal (T) and provides it to the mother modulation unit 124, and the mother modulation unit 124 modulates the amplified signal to mother transmission unit 126. To provide. The mother transmitter 126 transmits the modulated signal to the mother apparatus B through the mother antenna 100. The reception state selection unit 110 is composed of a reception mode selection switch 110-2 and a reception response switch 110-2. The reception mode selection switch is selected as an automatic reception mode and a manual reception mode by a user's operation. The reception response switch 110-1 determines the signal detected by the mother microprocessor 132 from the DTMF detection unit and the audio detection unit 114 so that the mobile communication terminal can receive the number dial tone for the call. It is a switch controlled by the mother microprocessor 132 for determining whether the mobile communication terminal is to be in a reception state or an outgoing state by judging whether the ring signal is a ring signal (call signal or ring tone). That is, in case of a dial tone for making a call, the dial tone itself is transmitted to the receiver through the mother transmitter without receiving a switch, and in the case of a telephone ring signal for receiving a call, the receiver responds by operating the receiver answer switch. A switch having a function of switching so that the mobile communication terminal is switched to a reception state. At this time, the reception state switching function of the mobile communication terminal is obvious that the conventional technique of the present invention using an external switch to switch the mobile communication terminal to the reception state when receiving through the earphone jack of the mobile communication terminal in this field is obvious. It is true. Mother power switch 112 controls the power supply of the mother device (A) in accordance with the user's operation. The mother display unit 128 guides the automatic reception mode setting state and the use state according to the operation of the reception mode selection switch 110-2 of the user and the control of the mother microprocessor 132. The mother power saving control unit 130 is controlled by the mother micro processor 132 according to the signals of the audio sensing unit 114 and the DTMF sensing unit input to the mother micro processor 132 and in the power saving mode, the transmission signal processing unit 120 The power supply is cut off and power is supplied to the transmission signal processing unit 120 in the normal mode.

The mobile communication terminal connection monitoring / alarm unit 134 detects a connection state of the mobile communication terminal T through the voltage detection of the mobile communication terminal connection unit connected to the mobile communication terminal, and does not input power from the power supply unit 148. In other words, if the mobile communication terminal T is connected while the start key of the vehicle is turned off and the power supply unit is not supplied, the mobile communication terminal connection alarm unit 134 supplies power from the spare battery 144 described later. Receives a supply of alarm sound through the mother speaker 136. The speaker used herein may be used as long as a warning sound can be generated by converting an electrical signal such as a piezo buzzer or a normal voice reproduction speaker into a voice signal. Of course, it is well known in the art that a charging power source such as a capacitor may be used instead of a spare battery.

The voltage stabilizer 140 receives a power supply from the power supply unit 148 (such as a jack of a vehicle), transforms the power to the mother device A, and incorporates a stabilization circuit to supply a constant voltage. The charging state is connected to the power supply unit 148 in parallel with the charging circuit 142 for charging the spare battery utilized as the operating power of B) to charge the spare battery 144 and to display a full charge, a charge state, and the like. The display unit 146 is controlled. And the mother microprocessor 132 controls the mother device (A) as a whole according to a preferred embodiment of the present invention, this control process will be described later in detail with reference to the flowchart shown in FIG. In particular, the mother microprocessor 132 has a mother channel selector 130 for searching and selecting the available channel B and the available channel. Here, the function of the mother channel selector utilizes a known method of selecting a channel to prevent crosstalk used in wired / wireless telephones.

And the detailed configuration and operation of the magnetic measuring device (B) according to a preferred embodiment of the present invention will be described in detail with reference to FIG. The self-received signal processing unit 202 is composed of a self-receiving unit 204, a self- demodulating unit 206, a volume control unit 208, and an audio amplifier 210. The magnetic receiver 204 receives, amplifies, and demodulates an RF signal from the mother apparatus A through the magnetic antenna 200 and provides the magnetic demodulator 206. The magnetic demodulator 206 provides the volume control unit 208 after the FM demodulates the received signal. The volume controller 208 adjusts the size of the voice signal under the control of the own microprocessor 226. The magnetic microprocessor 226 controls the volume adjusting unit 208 according to the operation of the gain adjusting unit 220 by the user so that the reception signal can be output at a desired volume. The received signal output by the volume controller 208 is amplified by the audio amplifier 210 and input to the earphone connection unit 212 and the speaker output unit 214. An earphone is connected to the earphone connection 212, which enables a secret call. The speaker output unit 214 is composed of an output amplifier 216 and the speaker 218, the output amplifier 216 amplifies the received signal and outputs through the speaker 218. The magnetic speaker 218 and the microphone 236 are integrally installed at a position close to the user's location, thereby minimizing the input level of the microphone 236 to minimize the inflow of ambient noise and allowing the voice to be heard clearly. The microphone input unit 234 composed of the microphone 236 and the microphone amplifier 238 amplifies a voice input through the microphone 236 and is input to the own transmission signal processor 240. The self-transmitted signal processor 240 is composed of a self-modulator 242, a self-transmitter 244, the self-modulator 242 is FM-modulated the signal input from the microphone input unit 234, the self-transmitter ( 244). The mother transmitter 244 transmits the FM modulated signal to the mother apparatus A through the mother antenna 200. The receiving switch 222 activates by receiving power from the mother microprocessor 226 by applying power to the audio amplifier 210 by the mother microprocessor 226.

The magnetic sleep mode controller 230 controls the power supply of the magnetic transmitter 234 under the control of the magnetic microprocessor 226 determining whether the magnetic receiver control unit has a signal. The output selection switch 224 is a speaker / earphone switching switch and controls the power supply of the output amplifier 216 according to a user's operation. That is, when the user operates the output selection switch 224 to use the earphone, the power supplied to the output amplifier 216 is cut off so that the signal is not output to the magnetic speaker 218. The magnetic display unit 228 guides the user of the operation state of the output selection switch 224 under the control of the magnetic microprocessor 226. The magnetic power switch 248 controls a connection state between the magnetic battery 246 and the DC-DC converter 250 according to a user operation. The DC-DC converter 250 converts the power provided from the mother battery 246 and outputs the driving power of the mother device. The battery detector 252 detects a battery voltage state, determines a power supply state, a low battery state, and guides the same through the battery state display unit 254. The battery state display unit 254 guides a power supply state, a low battery state, and the like under the control of the battery detector 252. The magnetic microprocessor 226 generally controls the magnetic measuring device B according to a preferred embodiment of the present invention, which will be described later in detail with reference to the flowchart shown in FIG. 5. The magnetic microprocessor 226 also includes a magnetic channel selector 227 for selecting an available channel of the mother device A. FIG.

The operation of the wireless hands-free system HF configured as described above will be described schematically.

When the mobile communication terminal T is received while the user operates the reception mode selection switch 110-2 of the reception state selection unit 110 and sets the auto answering mode, the ring signal according to the reception is received. It is provided to the audio monitoring unit 114 via the terminal connection 118. At this time, the audio monitoring unit 114 detects a ring signal and notifies the mother microprocessor 132. The mother microprocessor 132 confirms the presence or absence of a DTMF signal through the DTMF monitoring unit 116. At this time, if the DTMF signal is not detected, the mother microprocessor 132 operates a response signal for the ring signal, that is, the reception response switch 110-1 of the reception mode selection unit (the reception response switch may trigger). The mobile communication terminal to be in a reception state by the mother microprocessor with the switch). The mobile communication terminal is provided to the mobile communication terminal T, and the mobile communication terminal is received. A transmission / reception path between the devices A is established to allow a call to be made through the wireless hands-free system HF. On the contrary, if the user detects that there is a signal for pressing a phone number for transmitting a mobile phone, that is, a DTMF signal, the mother microprocessor 132 does not provide a response signal for the ring signal and the mobile communication terminal T and Only the transmission / reception path between the mother device B and the mother device A is formed. That is, the dialing according to the user's operation can be continued.

A process of transmitting and receiving a signal through a transmission / reception path between the mobile communication terminal T, the own device B, and the mother device A will be described. The signal from the mobile communication terminal T is amplified by the mother transmitter amplifier 122, and FM-modulated by the mother modulator 124 and then transmitted to the mother apparatus B through the mother transmitter 126. The mother receiver 204 of the mother device B receives the signal and provides the signal to the mother demodulator 206. The mother demodulator 206 FM demodulates the signal. The demodulated signal is volume-controlled and amplified via the volume controller 208 and the audio amplifier 210, and then output to the speaker 218 or the earphone.

The user's voice input through the microphone 234 of the own device B is converted into a voice signal and input to the microphone amplifier 238. The microphone amplifier 238 amplifies the input voice signal and provides it to the mother modulator 242, and the mother modulator 242 provides the mother signal to the mother transmitter 244 after FM modulation. The mother transmitter 244 transmits the received FM modulated signal to the mother apparatus A through the mother antenna 200. The mother receiving unit 104 of the mother device A receives the signal from the mother device B and provides it to the mother demodulator 106. The mother demodulation unit 106 demodulates the received signal to the mother amplification unit 108 after FM demodulation, and the mother amplification unit 108 amplifies the demodulated signal and performs mobile communication through the mobile communication terminal connection unit 118. Provided to the terminal (T).

When the user receives the mobile communication terminal T while the user operates the reception mode selection switch 110-2 of the reception state selection unit 110 and sets the auto answering mode, the ring signal according to the reception is received. It is provided to the audio monitoring unit 114 via the terminal connection 118. At this time, the audio monitoring unit 114 detects a ring signal and notifies the mother microprocessor 132. The mother microprocessor 132 confirms the presence or absence of a DTMF signal through the DTMF monitoring unit 116. At this time, if the DTMF signal is not detected, the mother microprocessor 132 provides a response signal to the ring signal, that is, by operating the reception response switch 110-1 of the reception mode selection unit to the mobile communication terminal T to move. The communication terminal is placed in a reception state, and a communication path is established between the mobile communication terminal T, the own device B, and the mother device A so that a call can be made through the wireless hands-free system HF. On the contrary, if the user detects that there is a signal for pressing a phone number for transmitting a mobile phone, that is, a DTMF signal, the mother microprocessor 132 does not provide a response signal for the ring signal and the mobile communication terminal T and Only the transmission / reception path between the mother device B and the mother device A is formed. That is, the dialing according to the user's operation can be continued.

A process of transmitting and receiving a signal through a transmission / reception path between the mobile communication terminal T, the own device B, and the mother device A will be described. The signal from the mobile communication terminal T is amplified by the mother transmitter amplifier 122, and FM-modulated by the mother modulator 124 and then transmitted to the mother apparatus B through the mother transmitter 126. The mother receiver 204 of the mother device B receives the signal and provides the signal to the mother demodulator 206. The mother demodulator 206 FM demodulates the signal. The demodulated signal is volume-controlled and amplified through the volume controller 208 and the audio amplifier 210, and then output to the speaker 218 or the earphone.

The user's voice input through the microphone 234 of the own device B is converted into a voice signal and input to the microphone amplifier 238. The microphone amplifier 238 amplifies the input voice signal and provides it to the mother modulator 242, and the mother modulator 242 provides the mother signal to the mother transmitter 244 after FM modulation. The mother transmitter 244 transmits the received FM modulated signal to the mother apparatus A through the mother antenna 200. The mother receiving unit 104 of the mother device A receives the signal from the mother device B and provides it to the mother demodulator 106. The mother demodulation unit 106 demodulates the received signal to the mother amplification unit 108 after FM demodulation, and the mother amplification unit 108 amplifies the demodulated signal and performs mobile communication through the mobile communication terminal connection unit 118. Provided to the terminal (T).

Hereinafter, a process of turning off the power supply of the vehicle, that is, the ignition key, to leave the vehicle while leaving the mobile phone terminal connected to the mother device A will be described in detail with reference to FIG. 4.

When the user receives the mobile communication terminal T while the user operates the reception mode selection switch 110-2 of the reception state selection unit 110 and sets the auto answering mode, the ring signal according to the reception is received. It is provided to the audio monitoring unit 114 via the terminal connection 118. At this time, the audio monitoring unit 114 detects a ring signal and notifies the mother microprocessor 132. The mother microprocessor 132 confirms the presence or absence of a DTMF signal through the DTMF monitoring unit 116. At this time, if the DTMF signal is not detected, the mother microprocessor 132 operates a response signal for the ring signal, that is, the reception response switch 110-1 of the reception mode selection unit (the reception response switch can trigger). The mobile communication terminal is placed in a reception state by the parent microprocessor. The mobile communication terminal is provided to the mobile communication terminal T to receive the mobile communication terminal, and a transmission / reception path is formed between the mobile communication terminal T, the terminal device B, and the mother device A, and then through the wireless hands-free system HF. Allow the call to be made. On the contrary, if the user detects that there is a signal for pressing a telephone number for transmitting a mobile phone, that is, a DTMF signal, the mother-side microprocessor 132 does not trigger the receiving response switch, but the mobile communication terminal T and the own device ( B) Only the transmission / reception path between the mother device A is formed. That is, the dialing according to the user's operation can be continued.

A process of transmitting and receiving a signal through a transmission / reception path between the mobile communication terminal T, the own device B, and the mother device A will be described. The signal from the mobile communication terminal T is amplified by the mother transmitter amplifier 122, and FM-modulated by the mother modulator 124 and then transmitted to the mother apparatus B through the mother transmitter 126. The mother receiver 204 of the mother device B receives the signal and provides the signal to the mother demodulator 206. The mother demodulator 206 FM demodulates the signal. The demodulated signal is volume-controlled and amplified through the volume controller 208 and the audio amplifier 210, and then output to the speaker 218 or the earphone.

The user's voice input through the microphone 234 of the own device B is converted into a voice signal and input to the microphone amplifier 238. The microphone amplifier 238 amplifies the input voice signal and provides it to the mother modulator 242, and the mother modulator 242 provides the mother signal to the mother transmitter 244 after FM modulation. The mother transmitter 244 transmits the received FM modulated signal to the mother apparatus A through the mother antenna 200. The mother receiving unit 104 of the mother device A receives the signal from the mother device B and provides it to the mother demodulator 106. The mother demodulation unit 106 demodulates the received signal to the mother amplification unit 108 after FM demodulation, and the mother amplification unit 108 amplifies the demodulated signal and performs mobile communication through the mobile communication terminal connection unit 118. Provided to the terminal (T).

Hereinafter, the operation of the mother power supply, that is, the case where the starter key is turned off and the mother device to leave the vehicle while leaving the mobile phone terminal connected to the mother device A will be described in detail with reference to FIG. 4. .

If power is not applied to the mother device (A) (S300), that is, when the vehicle is turned off and the power supply unit 148 does not supply power, the mobile communication terminal connection / alarm unit 134 is connected to the mobile communication terminal T. It is determined whether the connection (S301). In this case, when the mobile communication terminal T is connected, the mobile communication terminal connection / alarm unit 134 determines that the user intends to leave the vehicle while leaving the mobile communication terminal T in the vehicle and alerts through the mother speaker 136. Generate sound (S302).

When power is applied to the mother device A (S300), the mother microprocessor 132 enters the standby state (S310). In such a standby state, when a call arrives at the mobile communication terminal T or the user presses the number button of the mobile communication terminal to make a call, a telephone call signal (hereinafter referred to as a 'ring signal') or a number button dial tone is transmitted through the earphone jack. It is converted into an electrical signal and sent out. The microprocessor of the mother device determines the presence or absence of the signal of the earphone jack through the DTMF monitoring unit 116 or the audio monitoring unit 114 (S320). The mother microprocessor 132 determines whether the signal output from the mobile communication terminal T is a DTMF signal or a ring signal (S330), and if the DTMF signal, the mother microprocessor 132 sets a DTMF flag (S331) ( That is, the reception response response switch controlled by the mother microprocessor 132 is kept in the off position), and power is supplied to the mother transmission unit (S332). The mother microprocessor 132 transmits a call signal for calling the own device through the mother transmitter (S333), receives a call reception signal from the own device (S334), and determines a transmission / reception state (S335). If the transmission and reception state is satisfactory, a dialing call sound according to a user's operation, that is, a button operation sound and a user's voice signal is transmitted to the own device (S336) (that is, the mobile communication terminal T, the own device B, and the mother device). (A) Only the transmission and reception path is established so that the button operation sound can be confirmed through the speaker or earphone of the own device and the user's dialing is continued).

If the transmission and reception state is poor, the channel is changed to repeat steps S333, S334, and S335 until the transmission and reception state is good. The mother microprocessor determines whether there is an audio signal from the audio monitoring unit (S337), and if there is a signal, continues the communication with the own side by performing the step S336, and if there is no signal, shuts off the power of the mother transmitter (S338) and waits. Enter

When the mother microprocessor 132 detects an audio signal through the audio monitoring unit 114 in step S330, the mother microprocessor 132 supplies power to the mother transmitter 120 through the power saving controller 130 (S130). S340), and transmits a call signal of a specific band (hereinafter referred to as a 'carrier') of a specific band (hereinafter, referred to as 'carrier') for communication with a transmission signal, that is, the measurement device (S350). By transmitting a carrier and receiving a signal in response to the call signal from the own device (S360), and determines the transmission and reception state (S365), if the transmission and reception state is bad, change the channel (S366), until the transmission and reception state is good Steps S350, S360, S365, and S366 are repeated.

When the transmission and reception state is good, the mother microprocessor turns on the reception response switch 110-1 (S370) (the reception response switch is a switch capable of triggering the mobile communication terminal to be in a reception state by the mother microprocessor). In operation S380, a transmit / receive path is formed to modulate and demodulate the received signal from the own device from which the channel is selected and the transmitted signal from the mobile communication terminal (S380).

The mother microprocessor 132 determines whether the audio signal is continued through the audio monitoring unit 114 (S390). If it does not last for a predetermined time, the mother microprocessor determines that the mobile communication terminal has terminated the call and transmits to the mother transmitter. Power supply is cut off (S391) to prevent unnecessary power consumption and the mother device enters the standby state. If the call is continued, steps S380 and S390 for maintaining transmission and reception with the own device are repeated until no audio signal is detected.

Next, an operation process of the own device will be described with reference to FIG. 5.

First, when the power switch 248 of the own device is turned on (S400), the own device enters a standby state (S410), and the own microprocessor 226 determines whether a call signal from the mother device is in the own receiver ( S420). If there is no received signal, the state goes to the standby state (S410) state, if there is a call signal (S430) to determine the reception state (S430), and if there is a crosstalk, etc., if the reception state is bad, change the channel (S451) and step S430 Repeat If the reception state is good, power is supplied to the own transmission signal processor 240, the microphone input unit 234, the audio amplifier 210 and the volume control unit 208 (S450). It transmits a call response signal (S460) and forms a transmission / reception path with the mother device to make a phone call (S470).

The microprocessor 226 detects the signal amplified by the audio amplifier 210 and determines whether the signal is amplified (S480). If there is a signal, the microprocessor 226 maintains a transmission / reception path with the mother device to continue the call. If there is no signal, the power supply to the own transmission signal processor 240, the microphone input unit 234, the audio amplifier 210, the volume control unit 208, etc. is cut off (S490) to prevent unnecessary power consumption, and the system is standby. Maintain state.

As described above, the wireless hands-free system of the present invention can facilitate the user's use of the mobile communication terminal by automatically performing an automatic response function according to the use state of the mobile communication terminal, and leaving the mobile communication terminal in a vehicle. There is an advantage that the user can be warned of leaving the vehicle.

In addition, the present invention has the advantage that it can appropriately adjust the audio signal output to the speaker or earphone.

Claims (7)

A wireless hands-free device comprising a mobile communication terminal having an audio jack, a wireless hands-free mother device electrically connected through an audio jack of the mobile communication terminal, and a wireless hands-free device that can wirelessly bidirectionally communicate with the mother device. In the system, The mother device includes a signal discrimination unit for determining a signal received from the audio jack, a reception state selection unit for putting the mobile communication terminal into a reception state or selecting a signal transmission state according to the type of the determined signal; A mother modulator that modulates an input signal to transmit the input signal to the mother apparatus, a mother channel selector that selects an available channel of the mother side to transmit the modulated signal to the mother apparatus, and the modulation A mother transmitter for transmitting the input signal to the mother apparatus through a selected channel, a mother receiver for receiving a signal from the mother apparatus, a mother demodulator for demodulating the signal received through the mother receiver, A mother microprocessor which controls to form the communication path or a transmission / reception path with the own device; In combination with the jack consists of an audio plug, which enables the signal input and output of the mobile communication terminal; The self-measurement apparatus may include: a self-determining unit receiving a signal from the mother unit, a self-demodulating unit demodulating the signal received through the self-receiving unit, an output unit converting the demodulated signal into an audio signal and outputting the audio signal; A microphone for receiving voice and converting the voice signal into a voice signal, a self modulator for modulating the voice signal from the microphone to the mother device, and a usable channel for transmitting the modulated signal to the mother device A self-side channel selector for selecting a signal, a self-side transmitter for transmitting the modulated signal to the mother device through the selected channel, and a child-side microprocessor for controlling each unit to form a transmission / reception path with the mother device. Wireless hands-free system, characterized in that. The method of claim 1, wherein the mother device And a mother power saving control unit for supplying power to the mother transmitter and the mother modulator only when a communication path is formed or a transmission path is formed. According to claim 1, wherein the magnetic measuring device Wireless hands-free system, characterized in that it further comprises a magnetic sleep control unit and a receiving switch for supplying power to the magnetic transmitter, magnetic modulator, microphone input unit, volume control unit, audio amplification only when the transmission path is formed. The method of claim 1, wherein the mother device An alarm output unit for outputting a preset alarm sound, And a mobile communication terminal connection / alarm unit for outputting an alarm sound through the alarm output unit when the mobile communication terminal is connected when the power is not applied. The method of claim 1, wherein the mother device It further includes a voltage stabilization unit for receiving power from the power supply unit to stabilize it, a charging circuit for charging the spare battery, a charge state display unit for indicating the state of charge of the spare battery, and a spare battery for supplying power to the mobile communication terminal connection alarm unit. Wireless hands-free system characterized in that. According to claim 1, wherein the magnetic measuring device In the battery that supplies power to the own device and the DC-DC converter which modulates the power of the battery according to the required static pressure of the own device, and the battery monitor that monitors the voltage and charge status of the battery, the battery status display part and the battery And a power switch for controlling the power supply to the own device through the DC-DC converter. The wireless hands-free system according to claim 1, wherein the mother device further comprises an anti-ring circuit.