KR200205563Y1 - Hands-free apparatus for mobile phone - Google Patents

Abstract

The present invention relates to a wireless hands-free device for a mobile phone, which is easy to design and uses a low-cost FM frequency to simultaneously transmit a voice signal and a hook signal to remotely control the hook switch of the mobile phone when using a wireless earphone. Its purpose is to. The present invention for this purpose comprises a first and a second transceiver. The first transceiver includes a first antenna, a mobile telephone connection jack, and a first signal processor. The mobile phone connection jack is for connecting with the mobile phone through the earphone connection jack of the mobile phone. The first signal processing unit modulates and transmits and receives a radio communication signal, separates and detects an audible frequency band and an audible frequency band from a received signal, and generates an on-hook signal of a mobile phone when the frequency of the received signal is a band above the audible frequency. . The second transceiver includes a second antenna, a second signal processor, a controller, and an earphone. The second signal processor generates an oscillation signal of an audible frequency or higher, modulates and transmits a radio communication signal, and amplifies and outputs the demodulated signal. The control unit is composed of a hook switch for activating the mobile phone when the call is generated and a microphone for collecting a voice signal. The earphone is for converting a signal amplified by the second signal processor into an audible sound and outputting the audible sound.

Description

Wireless handsfree device for mobile phone {Hands-free apparatus for mobile phone}

The present invention relates to a handsfree device for a mobile phone, and more particularly to a wireless handsfree device for a mobile phone.

A device that allows a driver driving a car to make a call using a mobile phone while driving is a hands free device. This hands-free device allows the driver to talk using wired or wireless earphones without lifting the mobile phone, which is a very useful device that reduces the risk of using the mobile phone while driving.

There are two types of conventional hands-free devices, wired and wireless. First of all, wired hands-free devices are inconvenient in installation, and when using a car cigar jack, howling occurs. The wireless hands-free device solves the problem of the wired hands-free device described above, but it is inconvenient to tune the frequency of the audio installed in the car during a call, and when the call comes in, the mobile phone should be hooked directly. there is a problem.

The wireless hands-free device for a mobile phone according to the present invention is easy to design and uses a low-cost FM frequency to simultaneously transmit a voice signal and a hook signal to remotely control the hook switch of the mobile phone when using a wireless earphone. There is a purpose.

The present invention for this purpose comprises a first and a second transceiver. The first transceiver includes a first antenna, a mobile telephone connection jack, and a first signal processor. The mobile phone connection jack is for connecting with the mobile phone through the earphone connection jack of the mobile phone. The first signal processing unit modulates and transmits and receives a radio communication signal, separates and detects an audible frequency band and an audible frequency band from a received signal, and generates an on-hook signal of a mobile phone when the frequency of the received signal is a band above the audible frequency. .

The second transceiver includes a second antenna, a second signal processor, a controller, and an earphone. The second signal processor generates an oscillation signal of an audible frequency or higher, modulates and transmits a radio communication signal, and amplifies and outputs the demodulated signal. The control unit is made of a microphone for collecting a voice signal and a hook switch for activating the mobile phone to make a call when a call occurs. The earphone is for converting a signal amplified by the second signal processor into an audible sound and outputting the audible sound.

1 is a view showing a wireless handsfree device for a mobile phone according to the present invention.

Figure 2 is a circuit diagram showing a first signal processing unit of the wireless handsfree device for a mobile telephone according to the present invention.

3 is a circuit diagram showing a second signal processor of the wireless hands-free device for a mobile phone according to the present invention.

Explanation of symbols on the main parts of the drawings

102 and 104: first and second signal processing unit 106: control unit

108: hook switch 110: microphone

112: earphone 114: mobile phone connection jack

116: first transceiver 118: second transceiver

202: oscillation circuit 204, 318: first and second switching circuit

206, 306: first and second transmitters 208, 308: first and second receivers

210: audio amplifier 212, 312: signal detector

214, 314: power supply circuit 302: low pass filter

304: high pass filter 310: comparator

A preferred embodiment of the wireless handsfree device for a mobile phone according to the present invention is described with reference to FIGS. 1 to 3 as follows.

First, Figure 1 is a view showing a wireless handsfree device for a mobile phone according to the present invention. As shown in FIG. 1, the wireless hands-free device for a mobile phone according to the present invention is composed of a first transceiver 116 and a second transceiver 118.

The first transceiver 116 is composed of a first signal processing unit 104, a mobile telephone connection jack 114, and a first antenna ANT1. The mobile phone connection jack 114 is for connecting to the earphone connection jack of the mobile phone so that communication can be made between the hands-free device and the mobile phone according to the present invention. The first signal processing unit 104 has a circuit built in to enable modulation and demodulation and transmission and reception of the FM signal, and the transmission and reception of the FM signal is performed through the first antenna ANT1.

The second transmission / reception apparatus 118 includes a second signal processing unit 102, a control unit 106, and an earphone 112. The control unit 108 is equipped with a hook switch 108 and the microphone 110. The hook switch 108 causes the call to be made by hooking the mobile phone when a call is generated, and the microphone 110 collects the voice signal of the user and transmits the voice signal to the second signal processor 102. The hook switch 108 functions the same as the hook switch of the mobile telephone. The earphone 112 is for converting the demodulated amplified signal from the second signal processor 102 into an audible sound and outputting the audible sound.

When the driver connects the mobile telephone connection jack 114 of the first transceiver 116 to the earphone jack of the mobile telephone, the driver presses the hook switch 108 of the second transceiver 118 when the mobile telephone is called. The hook signal is transmitted from the second signal processor 102 to the first signal processor 104 so that the mobile phone is hooked on. That is, the driver can hook on the mobile phone without directly manipulating the mobile phone. The position of the control unit 106 in which the microphone 110 and the hook switch 108 are mounted is reached near the driver's mouth when the earphone is inserted into the ear so that the driver's voice signal can be sufficiently transmitted to the microphone 110. do.

2 is a circuit diagram illustrating a first signal processor of the wireless hands-free device for a mobile phone according to the present invention. As shown in FIG. 2, the first signal processor 104 includes a first transmitter 306 and a first receiver 308, a low pass filter 302, a high pass filter 304, a comparator 310, and a first. The switching circuit 318 includes a first signal detector 312 and a first power supply circuit 314.

The first transmitter 306 modulates the call signal transmitted from the mobile phone and transmits it through the first antenna ANT1. The first receiver 308 demodulates a modulated signal input through the first antenna ANT1 to generate a first demodulated signal, which is a voice signal generated from the driver or a hook generated from the hook switch 108. It is a signal. The low pass filter 302 and the high pass filter 304 are for determining whether the signal received by the first receiver 308 is a voice signal or a hook signal. The low pass filter 302 detects only an audible frequency band of the first demodulated signal, and the high pass filter 304 detects a band above the audible frequency of the first demodulated signal. That is, the voice signal is detected by the low pass filter 302 because it is an audible frequency band, and the hook signal is detected by the high pass filter 304 because it is a 40 kHz frequency signal that is more than twice the audible frequency as described below. do. The comparator 310 generates a switching signal when the output signal (hook signal) of the high pass filter 304 is greater than or equal to a predetermined magnitude, and the switching signal turns on the first switching circuit 318. The first switching circuit 318 is turned on by the switching signal to generate a hook signal of sufficient size to turn on the hook switch of the mobile phone and transmit it to the mobile phone through the connection jack 316. The first signal detector 312 detects when a transmission signal of the first transmitter 306 or a reception signal of the first receiver 308 occurs to allow the first power supply circuit 314 to operate. The first power supply circuit 314 is for supplying power of a size necessary for transmitting and receiving a signal.

3 is a circuit diagram illustrating a second signal processor of a wireless hands-free device for a mobile phone according to the present invention. As shown in FIG. 3, the second transceiver 102 includes an oscillator circuit 202, a second switching circuit 204, a second transmitter 206, a second receiver 208, an audio amplifier 210, And a second signal detector 212 and a second power supply circuit 214.

The oscillation circuit 202 generates an oscillation signal of 40 kHz or more that is more than twice the audible frequency to generate the hook signal. The second switching circuit 204 is organically connected to the hook switch 108 of the control unit 106. When the hook switch 108 of the control unit 106 is turned on, the switch SW1 of the second switching circuit 204 is turned on. Is turned on to cause the oscillation signal of the oscillation circuit 202 to be delivered to the second transmitter 206. The second transmitter 206 modulates the oscillation signal generated by the oscillation circuit 202 and transmits it through the second antenna ANT2. This signal is transmitted to the first signal processing unit 104 through the above-described first antenna ANT1. The second receiver 208 receives and demodulates the first modulated signal generated by the first transmitter 306 to generate a second demodulated signal. The signal demodulated by the second receiver 208 is a call signal received by the mobile telephone. The audio amplifier 210 amplifies and outputs a second demodulation signal, that is, a call signal, and the amplified signal is transmitted to the driver through the earphone 112. The second signal detector 212 detects when a transmission signal of the second transmitter 206 or a reception signal of the second receiver 208 occurs to allow the second power supply circuit 214 to operate. The second power supply circuit 214 is for supplying power of a size necessary for transmitting and receiving a signal.

As described above, the wireless hands-free device for a mobile phone according to the present invention transmits a call signal and a hook signal at the same time using an FM signal, thereby sufficiently solving the problem of frequency selection of the existing wireless hands-free device.

Therefore, the wireless hands-free device for a mobile phone according to the present invention is easy to design and replaces a costly subcarrier or MCA (multi-channel access) method by using an inexpensive FM frequency to wirelessly transmit a voice signal and a hook signal. When using earphones, it is possible to remotely control the hook switch of the mobile phone, thereby maximizing the convenience of use by supplementing the weak points of the existing wireless hands-free device.

Claims (3)

A first antenna, a mobile phone connection jack for connecting to the mobile phone through an earphone connection jack of the mobile phone, and a modulated demodulation and transmission of a radio communication signal, and detecting an audible frequency band and a band above an audible frequency from the received signal; A first transmitting / receiving device comprising a first signal processor configured to generate an on-hook signal of the mobile telephone when the frequency of the received signal is a band equal to or greater than an audible frequency; A second antenna, a second signal processor for generating an oscillation signal of an audible frequency or more, modulating and transmitting a radio communication signal, transmitting and receiving amplified demodulated signal, and a hook for activating the mobile telephone when a call occurs A wireless hands-free device for a mobile phone, comprising: a control unit comprising a switch and a microphone for collecting voice signals; and a second transmitting / receiving device comprising an earphone for converting and outputting an amplified signal from the second signal processing unit to an audible sound. The method of claim 1, wherein the first signal processing unit, A first transmitter for modulating and transmitting a call signal transmitted from the mobile telephone through the first antenna; A first receiver configured to demodulate a modulated signal input through the first antenna to generate a first demodulated signal; A low pass filter for detecting an audible frequency band in said first demodulated signal; A high pass filter for detecting a band above an audible frequency in the first demodulated signal; A comparator for generating a switching signal when the output signal of the high pass filter is greater than or equal to a predetermined magnitude; A first switching circuit switched by the switching signal to turn on a hook switch of the mobile telephone; A first signal detector for detecting when a transmission signal of the first transmitter or a reception signal of the first receiver is generated; A wireless hands-free device for a mobile phone, characterized in that it comprises a first power supply circuit for supplying power of a size required for transmitting and receiving a signal. The method of claim 1, wherein the second signal processing unit, An oscillation circuit for generating an oscillation signal with an audible frequency or higher; A second transmitter for modulating the oscillating signal and transmitting it through the second antenna; A second receiver configured to receive and demodulate the first modulated signal generated by the first transmitter to generate a second demodulated signal; An audio amplifier for amplifying and outputting the second demodulated signal; A second signal detector for detecting when a transmission signal of the second transmitter or a reception signal of the second receiver is generated; And a second power supply circuit for supplying power of a size required for transmitting and receiving a signal.