KR200249758Y1 - Wireless hand-free device for hand-phone - Google Patents

Abstract

The present invention relates to a wireless handfree device for a mobile phone,

In particular, a PLL frequency synthesizer for generating a plurality of frequencies in accordance with an input code to a wireless ear microphone means having a wireless transceiver and an interface means connected to a mobile phone for transmitting and receiving voice signals between the wireless ear microphone means and the mobile phone. By applying a circuit, the frequency of the signals transmitted and received to each other is always set to a predetermined value constantly, and by receiving a radio broadcast according to the input of the function changeover switch, the transmission and reception frequencies of the produced wireless hand-free device are mutually different. Due to the different settings, it is possible to further improve the call quality of the wireless hand-free device, and relates to a wireless hand-free device for a mobile phone that can be used as a radio in case of emergency.

Description

Wireless handfree device for mobile phones {WIRELESS HAND-FREE DEVICE FOR HAND-PHONE}

The present invention relates to a wireless hand-free device for a mobile phone, and more particularly, to a wireless ear microphone means having a wireless transceiver and an interface means connected to a mobile phone so as to transmit and receive voice signals between the wireless ear microphone means and a mobile phone. By applying a PLL frequency synthesizer circuit that generates a plurality of frequencies according to the input code, the frequency of the signals transmitted and received between each other is always provided at a predetermined value, and the radio broadcasting can be received according to the input of the function changeover switch. Since the transmission and reception frequencies of the wireless hand-free device to be produced can be set differently, it is possible to further improve the call quality of the wireless hand-free device.

At present, the mobile phone provides general users with convenience in that they can talk without restriction of the location, but when the driver wants to talk with the mobile phone, the mobile phone must be held with one hand to cause a crash.

Therefore, a hand-free device is provided that allows a user to talk on a mobile phone without using his hand while driving or doing other work. The hand-free device has a separate speaker and a high-performance microphone installed inside a vehicle, and then the speaker and the microphone Is connected to the inside of the mobile phone through the connection jack formed in the mobile phone, so that the user can talk to the other party without holding the mobile phone while driving.

However, such a hands-free device requires an expensive device, which imposes an economic burden on the user who wants to use it, and also because the contents of the call with the other party are output through a speaker installed in the car, There was a problem that you can not talk secretly with the other party while on board.

In order to solve this problem, an ear microphone composed of an earphone and a microphone is provided, and by using the connection jack 11 of the ear microphone connected to the connection jack 11 formed on the mobile phone, such an ear microphone is not only inexpensive but also inexpensive. Since the other party's training is output through the earphone plugged into the ear, even if there is another person in the car, the contents of the call do not leak.

However, since the ear microphone is connected to the mobile phone by a certain length of wire, the mobile phone should always be located near the user. During operation, the wire connecting the ear microphone and the mobile phone is very inconvenient for handle operation or other operations. There was a problem at work.

Accordingly, the present applicant has submitted a wireless hand-free device (Patent Application No. 98-) to solve the above problems.

Applicant's prior application is connected to the connection jack of the mobile phone, the relay operation to enable the transmission and reception of the voice signal between the wireless ear microphone means and the mobile phone, when the ring signal is detected from the mobile phone is automatically powered on the ring signal by the wireless ear microphone means Interface means for transmitting;

It is equipped with a microphone and a speaker to talk with the other party, and when a ring signal is received from the interface means, a carrier for converting the mobile phone into a call state is generated so that the user can operate the speaker and the microphone without manipulating the mobile phone. Wireless ear microphone means for enabling a call to the caller; It consists of

The user can talk to the other party by using the mobile phone without holding the mobile phone, as well as the interface means connected to the mobile phone and the ear microphone which provides the user to hear the other party's voice wirelessly. To provide convenience.

However, the prior application filed by the present applicant is that the first transmission frequency transmitted from the interface means to the ear microphone means and the second transmission frequency transmitted from the ear microphone means to the interface means are set differently, so as to minimize mutual signal interference. However, if several users having the interface means and the ear microphone means in the vicinity use the wireless hand free device simultaneously, the risk of crosstalk and eavesdropping occurs because the first and second transmission frequencies are the same. There was a problem.

Therefore, the present invention for solving the above problems is a wireless ear microphone means having a wireless transceiver, and the interface means connected to the mobile phone means for transmitting and receiving voice signals between the wireless ear microphone means and the mobile phone to the input code According to the PLL frequency synthesizer circuit that generates a plurality of frequencies according to the frequency of the signals transmitted and received to each other at a predetermined value always at a constant, and to receive radio broadcasting in accordance with the input of the function switch, the radio produced The purpose of the present invention is to provide a wireless handfree device for a mobile phone, which can further improve the call quality of the wireless handfree device because the transmission and reception frequencies of the handfree device can be set differently.

1 is a block diagram showing an interface means applied to the present invention.

Figure 2 is a block diagram showing a wireless ear microphone means applied to the present invention.

※ Explanation of symbols for main parts of drawing

20: first transmitting unit, 21: first power supply unit,

23: connecting jack, 25: ring signal detector,

26 is a signal generator, 30 is a first receiver,

31: first detector, 34: carrier detector,

40: second receiver, 41: second power supply,

44: second detector, 47: ring signal detector,

50: second transmitter, 53: gain limiter,

54: carrier generator, 55: second frequency modulator,

1OO: first PLL frequency synthesizer circuit, 10O1: first input unit,

102: first DC / DC converter,

200: second PLL frequency synthesizer circuit 201: second input unit,

202: function changeover switch, 203: second DC / DC converter

The present invention for achieving the object is configured as shown in Figure 1 and 2,

A first transmitter 20 which is connected to the connection jack 8 of the cellular phone and automatically turns on when a ring signal is detected from the cellular phone and modulates and transmits the ring signal at a first transmission frequency to a wireless ear microphone unit, and a wireless ear microphone. An interface means composed of a first receiver 30 which receives a signal modulated by a second transmission frequency from the means and transmits the transmitted signal to a cellular phone;

A second receiver 40 for detecting a ring signal from a signal received from the interface means and outputting a voice signal received from the interface means through the speaker 49 in the state of being switched to the call mode; Wireless ear microphone means configured to generate a carrier for converting the cellular phone into a call state and to modulate the generated voice or voice signal into a second preset transmission frequency and transmit the same to the interface means; In the wireless hand-free device consisting of,

The interface means,

A first PLL frequency synthesizer that generates and provides different first and second transmission frequencies necessary for transmitting and receiving operations of the first transmitter 20 and the first receiver 30 according to a code input. A circuit 100 and a first input unit 101 which enables various code inputs so that a user can set an output frequency of the first PLL frequency synthesizer circuit 100,

The wireless ear microphone means,

The output frequency is variably set according to the code input, generates and supplies different first and second transmission frequencies necessary for the transmission / reception operation of the second transmitter 50 and the second receiver 40, and the function changeover switch 202 The second PLL frequency synthesizer circuit 200 is switched to the radio receiving mode to receive the radio broadcast and outputs to the speaker 49 according to an operation of the user, and the user sets the output frequency of the second PLL frequency synthesizer circuit 200. The second input unit 201, which is capable of inputting various codes, becomes an input means for setting a radio reception channel when the second PLL frequency synthesizer circuit 200 is switched to a radio reception mode, and the second input unit 201. It is characterized in that it further comprises a function switching switch 202 for mode conversion of the PLL frequency synthesizer circuit 200.

The interface means and the wireless ear microphone means first and second DC / DC converters 102 and 203 for boosting the DC voltage output from the power supply unit to a driving voltage of the interface means and the wireless ear microphone means. Characterized in that it comprises a.

The specific configuration of the interface means and the wireless ear microphone means will be described briefly as follows.

The first transmitter 20 is switched by a first power supply 21 for power supply and a control signal input to supply the power of the first power supply 21 to the first DC / DC converter 102. A ring signal detector which detects a ring signal among signals input through the first switch 22, the first jack 22 to be connected to the connection jack 8 of the cellular phone, and the signal input through the first jack 23 to turn on the first switch. 25, a signal generator 26 for generating a predetermined transmission signal when a ring signal is detected, and a voice signal input through the connection jack 23 and a transmission signal output from the signal generator 26 are first transmitted. A first frequency modulator 24 for modulating at a frequency, and a first amplifier 28 for amplifying a signal modulated at a first transmission frequency and wirelessly transmitting it through an antenna,

The first receiver 30 includes a first detector 31 for detecting signals having a second transmission frequency among the signals received through the antenna ANT2, a second amplifier 32 for amplifying the detected signals, Filter 33 to remove the noise by filtering the signal output from the second amplifier (32) and to supply the cell phone through the connection jack 23, and converting the cell phone from the signal output from the filter 33 into a call state It consists of a carrier detector 34 for detecting the carrier for supplying the mobile phone through the connection jack (23).

The second receiver 40 is switched by the second power supply 41 for power supply and the input control signal to convert the output voltage of the power supply 41 to the second DC / DC converter 203. A second switch 42 to be supplied, a third switch 43 for switching the operation voltage by a user's operation to supply the output voltage of the power supply 41 to the second receiver 40, and an antenna ANT3 A second detector 44 for detecting signals having a first transmission frequency among the signals, a third amplifier 45 for amplifying the detected signals, and a filter for filtering the amplified signals to remove noise and supply the same to the speaker ( 46 and a ring signal detector 47 for detecting a ring signal from the signal output from the third amplifier 45 to turn on the second switch 42,

The second transmitter 50 includes a filter 51 for filtering out a voice signal input through the microphone 58 to remove noise, a fourth amplifier 52 for amplifying the filtered signal, and the fourth amplifier. A gain limiter 53 for limiting the gain of the audio signal amplified at 52; a carrier generator 54 for generating a carrier for switching the cellular phone to a call state after a predetermined time when power is supplied; And a second frequency modulator 55 for modulating the voice signal and the carrier at a second transmission frequency, and an amplifier 56 for amplifying and transmitting the frequency modulated signal through an antenna.

Referring to the operation of the present invention configured as described above is as follows.

First, the user turns on the third switch 43 of the wireless ear microphone means so that the power is supplied to the second receiver 40 to exist in the reception standby state, and at the same time, the user operates the function switching switch 202 to operate the second switch 43. The PLL frequency synthesizer circuit 200 is set to the hand free mode, with the interface means in the off state.

In this state, when a ring signal is detected on the cellular phone and output to the first transmitter 20 through the connection jack 23, the ring signal detector 25 of the first transmitter 20 is input through the connection jack 23. The signal is detected and the first switch 22 is turned on so that the power of the first power supply 21 is boosted by the first DC / DC converter 102 to be supplied to each component of the interface means, and at the same time, the ring signal. Is output to the signal generator 25.

The signal generator 25 generates a predetermined transmission signal as a ring signal is input to the first frequency modulator 24, and the first frequency modulator 24 in the first PLL frequency synthesizer circuit 100. The transmission signal is modulated according to the output first transmission frequency and transmitted to the second reception unit 40 of the wireless ear microphone unit, which is in the reception standby state, through the first amplifier 28 and the antenna ANT2.

On the other hand, the second detector 44 of the second receiver 40 is a signal corresponding to the first transmission frequency output from the second PLL frequency synthesizer circuit 200 of the signals received through the antenna ANT3, that is, The transmission signal transmitted from the first transmission unit 20 is detected and output, and the third amplifier 45 amplifies and outputs the detected transmission signal.

At this time, the ring signal detector 47 of the second receiver 40 detects the ring signal output from the amplifier 45, and turns on the second switch 42 to operate the second power supply 41 by the operation. Since the output voltage of the voltage is boosted by the second DC / DC converter 203 and supplied to the second transmitter 50, power is supplied to each of the components constituting the second transmitter 50.

When power is supplied to the second transmitter 50, the carrier generator 54 generates a carrier for converting the cellular phone into a call state at the same time that the power is supplied, and outputs the carrier to the second frequency modulator 55. The frequency modulator 55 modulates the input carrier according to the second transmission frequency output from the second PLL frequency synthesizer circuit 200 and transmits the modulated carrier to the first receiver 30 through the amplifier 56 and the antenna ANT3. .

The detector 31 of the first receiver 30 is a signal corresponding to a second transmission frequency output from the first PLL frequency synthesizer circuit 100 among the signals received through the antenna ANT2, that is, the second transmitter ( The carrier output from 50 is detected and output to the amplifier 32. The second amplifier 32 amplifies the detected signal, and the filter 33 filters and outputs the amplified signal.

The carrier detector 34 of the first receiver 30 detects the carrier output from the filter 33 and supplies it to the mobile phone through the connection jack 23. The carrier opens a flip of the mobile phone or sets a call key. Since the signal is configured to have the same function as that of the input, the cellular phone receiving the carrier is switched to the call state.

As the cellular phone is switched to the call state, the other party's voice is transmitted to the first transmitter 20 through the connection jack 23, the first transmission frequency by the first frequency modulator 24 of the first transmitter 20 The signal of the transmitted caller is detected by the detector 44 of the second receiver 40 and then passed through the amplifier 45 and the filter 46 through the antenna ANT2. While being amplified and filtered and supplied to the speaker 49, the voice of the other party is output through the speaker 49 inserted into the user's ear.

In addition, the user's training is converted into an electric signal by the microphone 58, filtered and amplified while passing through the filter 51 and the amplifier 52, and then modulated to the second transmission frequency by the second frequency modulator 55. And the voice signal of the user transmitted through the antenna ANT3 is detected by the detector 31 of the first receiver 30 and then the amplifier 32 and the filter 33. After passing through and amplified and filtered through the connection jack 23 is transmitted to the mobile phone, the other party will be able to hear the user's voice.

On the other hand, when the user operates the function switching switch 202 to listen to the radio broadcast using the wireless ear microphone means, the second PLL frequency synthesizer circuit 200 operates the radio receiving mode by the operation of the function switching switch 202. Is switched to.

Subsequently, the channel of the radio broadcast received by the second PLL frequency synthesizer circuit 200 is varied according to a code that a user manipulates an input key provided in the second input unit 201, and the second PLL frequency synthesizer is changed. The radio broadcast received by the circuit 200 is output through the speaker 49 so that the user can listen to the desired broadcast.

As described above, the first and second PLL frequency synthesizer circuits 100 and 200 applied to the present invention have different frequencies according to code changes inputted by manipulation of the first and second input units 101 and 201. Will print

Therefore, if the output frequency of the PLL frequency synthesizer circuit installed in various products is set to different frequencies at the time of product launch, even if several people talk in the public place using the wireless hand free device, You will be able to escape.

When the DC / DC converter is installed in the interface unit and the wireless ear microphone unit, respectively, the output voltages of the first and second power units 21 and 41 are boosted and supplied as the driving voltages. 41) can be replaced by a small battery, with the added benefit of significantly reducing the volume of the product.

As described above, the present invention provides a plurality of wireless ear microphone means including a wireless transceiver and an interface means connected to a mobile phone so as to transmit and receive voice signals between the wireless ear microphone means and the mobile phone according to an input code. Wireless hand-free device produced by applying a PLL frequency synthesizer circuit that generates a frequency to provide a constant frequency of signals transmitted and received to each other at a predetermined value at all times, and to receive radio broadcasting according to the input of a function changeover switch. Because the transmission and reception frequencies can be set differently, the call sound quality of the wireless handfree device can be further improved, and the wireless handfree device for a mobile phone can be used as a radio in case of emergency.

Claims (2)

A first transmitter 20 connected to the connection jack 8 of the cellular phone and automatically turned on when a ring signal is detected from the cellular phone to modulate and transmit the ring signal at a first transmission frequency to the wireless ear microphone means, and a wireless ear microphone means Interface means configured to receive a signal modulated by a second transmission frequency from the first transmission unit and supply the received signal to a mobile phone; The second receiver 40 detects the ring signal from the signal received from the interface means and outputs the voice signal received from the interface means through the speaker 49, and the mobile phone is detected when the ring signal is detected. A wireless ear microphone means composed of a second transmitter 50 for generating a carrier for switching to a call state and modulating a generated voice signal through a microphone or a second preset transmission frequency to an interface means; In a wireless hand-free device, The interface means, A first PLL frequency synthesizer circuit for generating and providing different first and second transmission frequencies required for transmitting and receiving operations of the first transmitter 20 and the first receiver 30 according to a code input. And a first input unit 101 which enables various code inputs so that a user can set an output frequency of the first PLL frequency synthesizer circuit 100. The wireless ear microphone means, The output frequency is variably set according to the code input, and generates and supplies different first and second transmission frequencies required for the transmission / reception operation of the second transmitter 50 and the second receiver 40, and the function changeover switch 202. The second PLL frequency synthesizer circuit 200 is switched to the radio receiving mode to receive the radio broadcast and outputs the speaker 49 according to the operation of the user, and the user can set the output frequency of the second PLL frequency synthesizer circuit 200. The second input unit 201 serves as an input means for setting a radio reception channel when the second PLL frequency synthesizer circuit 200 is switched to a radio reception mode so that various code inputs are possible. Wireless hand-free device, characterized in that further comprises a function switch for switching the mode of the synthesizer circuit (202) (202). The method of claim 1, The interface means and the wireless ear microphone means includes a first and second DC / DC converter (102) (203) for boosting the DC voltage output from the power supply unit by a predetermined value to supply the driving voltage of the interface means and the wireless ear microphone means. Wireless hand-free device, characterized in that.