KR200225115Y1 - Wireless hands-free apparatus for portable telephone set - Google Patents

Abstract

The present invention relates to a wireless hands-free device for a mobile phone, including a base terminal connected to a mobile phone and a wireless terminal wirelessly connected to the base terminal so as to wirelessly communicate a call signal arriving at the mobile phone by applying a dedicated frequency. will be.

According to the present invention, the base terminal is connected to the cellular phone by a signal signal plug, and the wireless terminal has a call ON / OFF switch and a call state for turning on / off a call signal communication with the base terminal. LED to indicate is installed; The wireless terminal and the base terminal communicate with each other a signal signal transmission module and a call signal receiving module for wireless transmission of a call signal, a voltage level of the call signal transmission module and the call signal receiving module, a battery power saving function, and a call signal. It consists of a control module for controlling the; The signal processor includes a function of applying an operating voltage (1.5 V) to the call signal transmitting module and the call signal receiving module; The control module includes a voltage converting unit for converting a voltage from a battery into the operating voltage level, the communication ON / OFF switch for communicating the communication signal, and a voltage (3V) from the battery (a reference value is approximately 2.5V). The LED for the alarm in the case of falling below is comprised including the connected MPU.

Description

Wireless hands-free device for mobile phone {WIRELESS HANDS-FREE APPARATUS FOR PORTABLE TELEPHONE SET}

The present invention relates to a wireless hands-free device for a mobile phone, and more particularly, a mobile phone configured to wirelessly exchange a call signal between a base terminal connected to a main body of a mobile phone and a wireless terminal wirelessly connected to the base terminal. The present invention relates to a wireless handsfree device.

In recent years, as mobile phones based on personal mobile communication services are widely spread, there is a situation in which an environment capable of communicating without restriction of place and time is provided.

Such cellular phones, for example, when communicating while driving, are less likely to cause a safety accident due to a decrease in the driver's attention to safety driving, and a quiet call may be required in some places.

Moreover, although designs for miniaturization and light weight are gradually made for a mobile phone, the demand for light weight of a mobile phone including a battery providing an operating power is still continuing.

In view of this, it is now possible to mount a mobile phone in a vehicle so that a call can be made while the vehicle is being driven, and play a call signal coming to the mobile phone or transmit a call signal of the mobile phone user to the mobile phone to be transmitted to the other party. The hands-free device, which has a microphone and a speaker (or earphone) installed integrally, has been proposed and applied to practical use.

On the other hand, a wired hands-free called "Earphone Mic", which is equipped with a microphone function for inputting a call voice connected to a mobile phone and an earphone function for reproducing a call voice received on a corresponding mobile phone. The device is also in a proposed state.

In addition, a wireless hands-free device has also been proposed in order to eliminate inconvenience in use caused by signal lines caused by the earphone-type hands-free device.

The wireless hands-free device includes a base terminal that is wired to a mobile phone and a wireless terminal that is wirelessly connected to the base terminal to exchange call signals.

The operating frequency for exchanging call signals between the base terminal and the wireless terminal is set to approximately 46 to 49 MHz, and its operating power is designed to be 3V or 4V. You can set call channel by channel scanning method by selecting) method.

Therefore, in the wireless hands-free device according to the conventional example, a call signal arriving at a mobile phone is transferred from a base terminal to a wireless terminal while a call path is set between the base terminal and the wireless terminal, while the call signal from the wireless terminal is transferred to the base. As it is delivered to the mobile phone through the terminal to the other party, the wireless hands-free function is performed.

By the way, in the wireless hands-free device according to the conventional example, the communication between adjacent channels is established by supporting the use frequency of the call signal in the 46 to 49 MHz band and supporting the multi-channel (that is, 15-channel) scheme. Not only is it more likely to be triggered, but also the current consumption is increased due to the circuit configuration, and the operating voltage is also designed to be 3V or 4V, which significantly increases the consumption of the battery's battery charge capacity. It will result in a shortening.

Accordingly, the present invention has been made in view of the above-described circumstances of the prior art, and enables communication of a call signal by a dedicated frequency band while reducing the operating voltage level, employing a dedicated channel relay method, and multiple noises. It is an object of the present invention to provide a wireless hands-free device for a mobile phone designed to achieve optimal call signal transmission and to achieve compact weight by applying a filtering configuration.

In order to achieve the above object, according to a preferred embodiment of the present invention in the wireless hands-free device for a mobile phone consisting of a base terminal and a wireless terminal so that the mobile phone communicates the call signal wirelessly, the base terminal is a call signal plug to the mobile phone Connection is made by a signal, and the wireless terminal is provided with a call ON / OFF switch for turning on / off a call signal communication with the base terminal and an LED indicating a call state; The wireless terminal and the base terminal communicate with each other through a call signal transmission module and a call signal receiving module for wireless transmission of a call signal, a voltage level of the call signal transmission module and the call signal receiving module, a battery power saving control function, and a call signal communication. Provided is a wireless hands-free device for a mobile phone, which consists of a control module for the control function of the mobile phone.

Preferably, according to the present invention, the wireless terminal is provided with an earphone part protruding upwardly upward from the upper side thereof and a microphone for inputting a call signal formed at the lower side of the wireless terminal.

The call signal transmission module may include a modulator for modulating a call signal input from the microphone by a first oscillation signal, and a signal transmitter for amplifying and outputting the modulated call signal component through a loop antenna. The call signal receiving module comprises a signal mixing unit for mixing the call signal received through the loop antenna with the second oscillation signal, a filter for filtering the mixed signal, and an intermediate frequency conversion of the signal filtered by the filter. And a signal processing unit for low pass filtering to be delivered to the subscriber through the earphone unit through the signal output unit.

The signal processor may also include a function of applying an operating voltage (1.5 V) to the call signal transmitting module and the call signal receiving module.

The control module includes a voltage converting unit for converting a voltage (3V) from a battery into the operating voltage level, and controlling a communication ON / OFF switch for communicating the call signal and a communication state of the call signal. An LED indicating a deterioration state of the LED is connected to the MPU, and the MPU also includes a function of detecting a drop in the operating voltage (3V) of the MPU and controlling the display of the LED.

In the wireless hands-free device for a mobile phone according to the present invention of the above configuration, when a call signal arrives while the base terminal is connected to the mobile phone, communication of the call signal is made based on a dedicated frequency between the base terminal and the wireless terminal. do.

In addition, in order to execute the battery save function, the MPU of the control module monitors the communication state of the call signal at a predetermined time interval while applying an intermittent battery save control signal to the signal processor.

The signal processing unit smoothes the level of the voltage (1.5 V) applied to the operating power from the corresponding wireless hands-free device and provides it as the operating voltage.

1 is a view for explaining the outline of the wireless hands-free device for a mobile phone according to an embodiment of the present invention,

2a and 2b is a view for explaining the external structure of the wireless terminal of the wireless handsfree device for a mobile phone according to an embodiment of the present invention,

3 is a view showing the circuit configuration of a wireless hands-free device for a mobile phone according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: mobile phone, 20: base terminal,

30: wireless terminal, 34: LED,

36: call on / off switch, 40: microphone,

50: call signal transmission module, 70: call signal receiving module,

82: signal processor, 90: control module,

92: MPU.

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

1 is a view for explaining the outline of the wireless hands-free device for a mobile phone according to an embodiment of the present invention.

Referring to the drawings, the call signal jack (ie, earphone microphone jack) of the mobile phone indicated by the reference numeral 10 is connected to the call signal plug 22 of the base terminal 20 constituting the wireless hands free device according to the present invention in a detachable manner. The base terminal 20 is wirelessly coupled to the wireless terminal 30 for communication of the call signal.

The base terminal 20 can be detachably coupled to the back of the mobile phone 10 by, for example, Velcro tape (not shown), and the call signal plug 22 is provided on the upper side of the main body 20a. It is provided integrally, and the lower part of the upper surface is provided with a removable cover 26 for replacing the mercury battery, for example.

In addition, the wireless terminal 30 can be worn on the upper side of one side of the subscriber, for example, while the earphone unit 32 having a speaker therein is formed to protrude upwardly upward, and the MPU of the control module described later on one side thereof. LED 34 is installed to indicate the deterioration of the operating voltage (ie, 3V) of the phone, and on the other side, a call ON / OFF switch (36 in Fig. 2A) for starting a call is provided. A cover 38 for the replacement of the mercury battery is designed, and a microphone (40 in FIG. 2B) is provided at the bottom of the back for input of a voice signal.

3 is a diagram illustrating a circuit configuration of a wireless terminal of the wireless hands-free device for a mobile phone according to the present invention, and the circuit configuration is similarly applied to the base terminal 20.

Referring to the drawings, the wireless terminal 30 of the wireless hands-free device for a mobile phone according to the present invention is a call signal transmission module 50 for transmitting a call signal, a call signal receiving module 60 for receiving a call signal and And a control module 90 for controlling the call signal transmission module 70 and the call signal receiving module 60.

Preferably, the call signal transmission module 50 receives a call signal (or data) when a call signal from the microphone 40 or data (for example, call signal data from the base terminal 20) is input. A signal input unit 52 for receiving and amplifying a first signal; a first oscillator 54 for oscillating a frequency signal of a dedicated channel (for example, a frequency selected from a range of 290 to 320 MHz) for a predetermined call signal transmission; The modulator 56 modulates the call signal from the signal input unit 52 by the frequency signal oscillated at 54, and amplifies the call signal modulated by the modulator 56 so that the loop antenna 60 can be amplified. It is configured to include a signal transmission unit 58 to be transmitted through.

In addition, the call signal receiving module 70 receives a call signal from the base terminal 20 through a loop antenna 72 and performs signal filtering and amplification processing on the noise signal and the first oscillator 54. A second oscillator 76 for oscillating a signal having a predetermined frequency difference (i.e., 21.4 MHz) with respect to the frequency of the oscillated signal, and a call signal from the signal receiver 74 and the second oscillator 76 Signal mixing unit 78 for mixing and processing the oscillation signals of the signal and extracting the frequency difference signal, and passing through the filter 80 and the filter 80 for filtering the call signal output from the signal mixing unit 78. After converting the signal into an intermediate frequency signal (ie, 455 kHz) oscillated by the third oscillator 84, low-pass filtering is performed, and the corresponding radio terminal 30 (and also in the case of the base terminal 20) Similarly) smoothing operation voltage (i.e. 1.5V) for low power consumption And a signal output unit 86 for outputting the low pass filtering signal of the signal processor 82 through the earphone unit 32. .

In addition, the control module 90 has a predetermined power supply voltage (preferably 3V) from the MPU 92 and the battery (not shown) made of, for example, a mercury battery. And a voltage converting unit 94 for converting the voltage level (ie, 1.5V) into an operating voltage of the call signal transmitting module 50 and the call signal receiving module 70.

The MPU 92 applies a predetermined frequency signal (e.g., square wave) to the voltage converter 94 to perform voltage level conversion (e.g., by switching switching of the switching transistor of the voltage converter 94). do.

In addition, the MPU 92 applies a battery power saving control (BSC) of the operating voltage (ie, 1.5V) to the signal processing unit 82 to scan the switching to the call state every period of a predetermined time. The MPU 92 also includes a function of lighting or blinking the LED 34 when a state in which the battery voltage applied to the operating voltage (ie, 3 V) falls below a predetermined level (for example, 2.5 V) is detected. do.

On the basis of the above configuration will be described in detail the operation of the wireless hands-free device for a mobile phone according to the present invention.

First, when a call arrives at the mobile phone 10, when the call ON / OFF switch 36 of the wireless terminal 30 is switched in response to a call to the mobile phone 10, The MPU 92 is activated by the 3V voltage applied from the mercury battery to perform the voltage conversion function by the voltage conversion unit 94 so that the 1.5V voltage obtained by the voltage conversion unit 94 is the signal processor 82. After being smoothed at), it is applied to the call signal transmission module 50 and the call signal receiving module 70 as an operating voltage Vreg.

In this state, the call voice input through the microphone 40 of the radio terminal 30 is amplified by the signal input unit 52 and then applied to the modulator 56, and the modulator 56 receives the first voice. The high frequency is modulated by the frequency signal oscillated by the first oscillator 54 and is applied to the signal transmitter 58. Accordingly, the signal transmitter 58 amplifies the call signal of the transmission target and performs the loop antenna 60. Through the base terminal 20 is transmitted through.

On the other hand, the call signal from the base terminal 20 received through the loop antenna 72 is first subjected to noise filtering at the signal receiving unit 74 and then applied to the signal mixing unit 78 so that the The difference signal is extracted by combining with the frequency signal oscillated by the second oscillator 76.

The call signal component extracted by the signal mixer 78 is filtered again by the filter 80 and then applied to the signal processor 82, and the signal processor 82 is applied to the call signal component. The intermediate frequency conversion process is performed based on the frequency signal (i.e., 20.945 MHz) oscillated by the oscillator 84, thereby obtaining an intermediate frequency signal of 455 kHz. The intermediate frequency processed call signal component is low-pass filtered by the signal processor 82 to extract only an audible sound frequency signal, and the call signal component of the audible frequency band is amplified by the signal output unit 86 so that the earphone unit By reproducing and outputting through 32, the wireless terminal 30 is delivered to the subscriber wearing the ear.

During the communication of the call signal, the MPU 92 of the control module 90 continuously monitors the level drop of the operating voltage (i.e., 3V) of the MPU 92 to be below a reference value (for example, 2.5V). When the LED 34 is lowered (or flashes), the battery voltage drop state is alarmed.

In addition, when the MPU 92 switches off the call ON / OFF switch 36 when the call is completed, the MPU 92 controls the voltage converter 94 and the LED 34 to be in an inactive state to enter the battery saving mode. do.

On the other hand, while the description has been made for the wireless terminal 30, the circuit configuration shown in Figure 3 is the same or similarly applied to the case of the base terminal 20 is of course to perform the operation of the above process.

As described above, according to the wireless hands-free device for a mobile phone according to the present invention, the wireless terminal is designed in a form that is convenient to be worn on the subscriber's ear, and can be driven by a low voltage level and low power consumption while setting a dedicated call signal communication channel. Designed to make sure high quality call signal communication is ensured.

In addition, during the call waiting, the wireless terminal activation control is executed at a predetermined time and an alarm is generated when the battery voltage level falls below the reference value, thereby ensuring sufficient battery power saving function and long time call and call waiting time. .

Claims (5)

In the wireless hands-free device for a mobile phone consisting of a base terminal and a wireless terminal to communicate the call signal wirelessly, The base terminal is connected to the mobile phone signally by a call signal plug, and the wireless terminal displays a call ON / OFF switch and a decrease in operating voltage for turning on / off a call signal communication with the base terminal. LED is installed; The wireless terminal and the base terminal communicate with each other a signal signal transmission module and a call signal receiving module for wireless transmission of a call signal, a voltage level of the call signal transmission module and the call signal receiving module, a battery power saving function, and a call signal. Wireless hands-free device for a mobile phone, characterized in that consisting of a control module for controlling the. The wireless hands-free device for a mobile phone according to claim 1, wherein the wireless terminal is provided with an earphone part protruding upwardly upward from the upper side thereof and a microphone for inputting a call signal formed under the wireless terminal. The signal transmission module of claim 1, wherein the call signal transmission module modulates a call signal input from the microphone by a first oscillation signal, and a signal for transmitting the modulated call signal component by a high frequency amplification and transmitting the same through a loop antenna. It is configured to include a transmission unit, The call signal receiving module includes a signal mixing unit for mixing a call signal received through a loop antenna with a second oscillation signal, a filter for filtering the mixed signal, and an intermediate frequency conversion and a low pass of the signal filtered by the filter. A wireless hands-free device for a mobile phone, characterized in that it comprises a signal processing unit having a smoothing function of the operating voltage while being transmitted to the subscriber through the earphone unit through the signal output unit. 4. The wireless hands-free device for a mobile phone according to any one of claims 1 to 3, wherein an operating voltage smoothed and applied by said signal processing unit is 1.5V. 5. The control module according to claim 4, wherein the control module comprises a voltage converter for converting a voltage from a battery to the operating voltage level, and an MPU for controlling a communication state of the call signal. And a control for activating the LED when a drop below 3 V) is detected.