JP3053424U - Call system for mobile phone terminals - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To turn on the power of a remote receiving device by a power button provided on a remote receiving device attached to an ear, and to turn on the power of the remote receiving device after a call is over. , A call system for a mobile phone terminal, which is automatically turned off. A relay device includes a voice input unit.
And an incoming call is detected using the control signal as a trigger.
A first main body power control section 112 for controlling power supply to the entire circuit of the relay apparatus 100 in accordance with the detection result; and a remote receiving apparatus for comparing a noise component voltage value with a specified voltage value. Comparing means, a time measuring section for outputting a reset signal when the output of the noise comparing means continues for a predetermined time, a reset section for inverting a logic state in response to the input of the reset signal, and a signal from the reset section And a second main body power control unit for controlling power supply to the entire circuit of the remote receiving apparatus in accordance with the input.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a communication system for a mobile phone terminal that enables a user to safely communicate with a mobile phone terminal while driving a car without using both hands, and in particular, a remote receiving device attached to an ear when answering a call. By pressing the power button provided on the (earphone) only once, the power of the remote receiving device can be easily turned on, and after the end of the call, the remote receiving device can be operated without operating the power button. The present invention relates to a communication system for a mobile phone terminal in which a device is automatically turned off.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a communication system for a mobile phone terminal has been developed to assist a driving driver in making a call with a mobile phone in a car. In general, the communication system for a portable telephone terminal is connected to a relay device (main body) connected to the portable telephone terminal, and is cordlessly connected to the main body by infrared rays or the like, and is attached to the ear of a speaker (driver). Type remote receiving device (earphone). This communication system for a mobile phone terminal may be referred to as a “hand-free communication device”, a “hands-free communication device”, a “cordless communication device”, or the like.

[0003] For example, Japanese Patent Application No. 09-274855 discloses an off-hook control at the time of answering an incoming call or at the time of making a call and operating a switch by operating a switch provided on a communication means (earphone) attachable to a speaker's ear. It discloses a hands-free type call device that can be operated on-hook at the end. In particular, the main unit of the communication device is of a type that constantly supplies power from a vehicle battery by a cigar plug or the like, and the above-mentioned earphone is of a type that always supplies power from a battery such as a built-in dry battery. Therefore, both require manual power-off operation to turn off the power. Further, it is disclosed that the hook switch provided in the earphone only performs control such that when the switch is pressed once, the hook is turned off, and when it is pressed again, the hook is turned on. From the above, when ending a call, it is necessary to operate the hook switch provided on the earphone, and in order to withstand long-term use, turn off the power switch of the earphone in detail. Operation is also necessary, and the speaker (driver) must always care about the operation of these hook switch and power switch.

[0004] For example, Japanese Patent Application Laid-Open No. 9-162961 discloses a cordless telephone communication system using infrared rays. This call system discloses an operation of simply transmitting and receiving by infrared rays during a call, in addition to an operation for controlling start and end of a call and specific technical means thereof. In addition, in this telephone system, transmission and reception are one-way communication, and transmission and reception are switched by PTT. Therefore, simultaneous two-way communication like telephone is impossible, and only a transceiver is used. It can be used for Therefore, in order to switch between transmission and reception, it is necessary to manually switch the PTT switch. Although there is no description about the power supply of the transmitter / receiver circuit unit attached to the speaker used in this communication system, it is always supplied by a battery such as a battery, and when the power is turned off, the power switch of the speaker is turned off. Operation is considered necessary. Therefore, the speaker must always care about the operation of the PTT switch and the power switch.

[0005] For example, Japanese Patent Application Laid-Open No. 4-249433 discloses an invention relating to an extension device for setting a mobile phone and a headset capable of performing a hands-free call using infrared rays from the extension device. . According to the invention, hands-free communication using infrared communication by FM modulation is enabled. The power supply of the expansion device provided by the present invention is supplied from the battery of the automobile, and it is necessary to perform an operation to turn on the power supply during use or to keep the power supply on at all times. It can be of any type. Further, although the power supply of the headset according to the present invention is not disclosed, it is considered that the power supply is always supplied by a battery such as a battery, and the power switch must be turned off by a speaker when the power is turned off. Further, it only discloses that the hands-free call function according to the present invention is provided by simply performing infrared communication by the FM modulation. Therefore, in the present invention, it is considered that it is necessary to always operate the power switch of the expansion device, or it is necessary to keep the power on at all times without providing the power switch, and it is substantially impossible to save power. Similarly, it is considered that the headset also needs to operate the power switch every time a call ends or each time a call is made, so the speaker (driver) must always care about the operation of the power switch. . Further, with the adoption of the FM modulation method, a large level of output noise is generated when there is no signal. However, since no measures are taken against the noise, the speaker is forced to listen to the noise. Therefore, the speaker is forced to turn off the headset immediately after the end of the call in any situation.

For example, Japanese Patent Laid-Open Publication No. 56-152343 discloses a cordless loudspeaker device. Such a loudspeaker apparatus is said to be capable of remotely controlling a call by using a transmitter in which a dial, a hook switch, and a microphone are connected. Since it is disclosed that dialing in the telephone device requires dialing while pressing the hook switch of the transmitter, a complicated operation with one hand or an operation with both hands is necessarily required. As a result, since it is considered that the operation is easier without the cordless, it is considered that it is very difficult to implement the present invention in a car. In addition, dial signals, hook signals, audio signals, etc., which should always be applied to the transmitter when transmitting, etc., are simply referred to as "signals that are added to the transmitter to generate signals, such as electromagnetic waves, sound, or light. Is transmitted "is only disclosed.

[0007] For example, Japanese Utility Model Laid-Open Publication No. Hei 7-28749 discloses an adapter for a mobile phone that enables hands-free communication. In the adapter, when a mobile phone is set, a microphone and a speaker provided in advance in the adapter are connected to input / output terminals of the mobile phone, thereby realizing a hands-free call function. Since the microphone is disclosed as being a condenser microphone, this adapter cannot immediately respond to an incoming call unless the adapter is always energized. Also, when installing this adapter inside the vehicle, it is necessary to provide at least wiring for the microphone and speaker inside the vehicle. If the length of this wiring is long, or if it coincides with or approximates the length by which a radio wave or radio station can easily pick up the transmitted radio wave, the radio wave or radio wave of the radio wave or radio communication A voltage corresponding to the broadcast content or communication content of the station may be induced, causing so-called interference. It also discloses that when a call is received, a call can be answered by turning on a call switch provided on the mobile phone itself. Therefore, the speaker (driver) must always operate the call switch visually or by groping. Further, it is described that the microphone provided in the adapter may be a wireless microphone, but the description merely discloses that “the microphone may be a wireless microphone”.

[0008]

[Problems to be solved by the invention]

 With the spread of mobile phones, the use of mobile phones while driving is increasing, but at the same time, the sudden increase in traffic accidents due to the use of mobile phones while driving is attracting public interest. In particular, the National Police Agency on March 19, 1998, told the National Public Safety Commission that the one-handed driving would make the steering wheel unstable and prevent safe driving, which would easily lead to an accident. Report (Asahi Shimbun, evening edition).

[0009] The above-described various communication systems for mobile phone terminals (as described in the section of the prior art, all of which can be used for cordless communication and include a main body (relay device) and an earphone (remote receiving device)) "Hands-free communication devices of the type" are generally referred to as "callers", although "a certain degree of effectiveness is recognized in preventing side-by-side driving." In this report, it is assumed that the driver who is talking while driving is distracted by the operation of the communication system for the mobile phone terminal in 1.66 seconds. It is included. This means that if the car is traveling at 40 km / h, the vehicle will travel about 18.4 m in side-by-side driving, and it will travel about 20 m by looking aside for one second without looking ahead. Danger is warned.

[0010] According to the report, the accident at the time of incoming call accounts for 41% of all traffic accidents related to mobile phones, and is the leading cause of the accident. Calls can be made after stopping driving and stopping the car on the roadside to prevent accidents before they occur.However, when answering an incoming call, it is strongly recommended to respond with a loud ringing tone of a mobile phone. In general, the driver often performs a response operation even after a moment of driving aside.

At this time, if the driver is conscious of power saving, the power supply of the earphone should be normally turned off. Therefore, first, fumblingly search for the power switch, and perform an operation of further turning on the power switch. After that, it is necessary to press the call button of the mobile phone to respond. However, with the conventional power switch, the switch that switches on and off is a toggle switch, and the position of the power switch can be visually checked (since it is located near the driver's ear). Failure to do so and forgetting whether the driver turned off the power switch after the call was over, etc. resulted in erroneous operations such as pressing the power switch twice and erroneously disconnecting the call. Or it was difficult to answer the call. For this reason, it has become a social problem that the driver's attention during driving is strongly attracted to the operation of the power switch, and that it is easy to induce a traffic accident.

Further, when the power switch provided on the earphone is a switch that is turned on by a single pressing operation, the power of the earphone keeps the on state as it is once turned on. Therefore, after the call, some manual operation to turn off the power was always required. On the other hand, even for drivers who are not conscious of power saving, the battery of the earphone is usually consumed in a short time, so the internal battery is wasted because the user forgets to turn off the power and the battery needs to be replaced frequently. There was also a disadvantage that it was complicated.

Further, when the communication between the main body and the earphone is performed by infrared communication of FM modulation or the like, since there is annoyed by a large volume of output noise when there is no signal, the power is immediately turned off after the end of the call or the volume is reduced. Requires an adjustment operation. As a result, it has been pointed out that the speaker is more likely to be distracted by the operation, which contributes to the above-mentioned increase in traffic accidents.

Further, the power of the main body (particularly, the type in which a mobile phone terminal is mounted and fixed in a car) is usually supplied from a car battery through a cigar plug or the like at all times. Therefore, if the car engine is turned off, the freehand calling device cannot be used. On the other hand, if the power supply is a battery or nickel rechargeable battery of the type built into the main body, turning on the power supply of the main body at all times wastes power. The disadvantage is that maintenance work is increased.

[0015] If the user does not like this, the speaker must cut off the power supply while the telephone call is not in progress. However, doing so may increase the risk of driving aside, and may also cause an incoming call. Even if there is, there is also a problem that the attention of the speaker is further deviated from the driving operation of the vehicle because the response cannot be made immediately.

[0016]

[Means for Solving the Problems]

 Therefore, as a result of intensive research, the inventor relays the invented voice signal output from the mobile phone terminal, converts it into an infrared signal by FM modulation, and transmits it. And a remote receiving device for FM-demodulating the infrared signal and outputting a voice signal as a voice, wherein the relay device includes voice input means for picking up a voice uttered by a speaker; A first main power supply that detects that there is an incoming call to the mobile phone terminal by using a control signal from the mobile phone terminal as a trigger, and controls power supply to the entire circuit of the relay device in accordance with the detection result. A noise comparing means for comparing a voltage value of a noise component outside a voice band generated when the infrared signal is not received with a specified voltage value; A time measuring section for outputting a reset signal when the output of the comparing means continues for a predetermined time; a reset section for inverting a logic state in response to the reset signal output from the time measuring section; And a second main body power control section for controlling power supply to the entire circuit of the remote receiving apparatus in response to a signal input of the mobile phone terminal. By simply pressing the power switch provided on the earphone only once, after the end of the call, the power of the earphone is automatically turned off. As a result, the speaker turns off the power to save power. Since there is no need to consider such things, it is no longer necessary to drive aside, and it becomes possible to safely drive the car. That.

[0017]

[Embodiment of the invention]

 Hereinafter, the “mobile phone terminal” means any portable telephone terminal such as a so-called cellular mobile phone terminal, mobile phone terminal, car phone terminal, PHS (personal handy phone system) terminal, and the like. In particular, the “cellular system” includes any system such as the so-called NTT system, TACS system, TDMA system, and CDMA system, and the “mobile telephone terminal” includes a so-called MCA system (Multi Channel System). Access), public business wireless systems, general business wireless systems, personal wireless systems, and other telephone systems that may be used in any wireless system. Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an example of a use mode of the communication system for a mobile phone terminal according to the present invention. The mobile phone terminal communication system includes a relay device 100 that can be fixed on a dashboard in a car, a back mirror, a sun visor, a control panel, and the like, and a remote device for receiving an infrared signal transmitted by the relay device 100. And a receiving device 200. The relay device 100 is a device that is connected to the mobile phone terminal 300 by a cable C ₁ , relays an audio output signal of the mobile phone terminal 300, and transmits the signal as an infrared signal. On the other hand, the remote receiving device 200 is a device that is attached to a driver's ear and that demodulates an infrared signal received from the relay device 100, converts the signal into an audio signal, and listens. In particular, the mode shown in the frame A of FIG. 1 shows a case where the relay device 100 is fixed on a car cabinet and connected to the mobile phone terminal 300. The mode shown in the frame B indicates a case where the relay device 100 is fixed below the rearview mirror and connected to the mobile phone terminal 300 fixed to the driver's seat side window. The inside of the C frame indicates a mode in which the speaker (driver) wears the remote receiving device 200 while wearing it on his ear.

The relay device 100 has a built-in voice input means (microphone) 100 h. Speech input means 100h converts an audio signal according to the voice of the driver into an electrical signal, via the cable C _1, by transmitting to the mobile phone terminal 300, the transmission of the driver call destination party This is for listening to such voice.

The power supply of the relay device 100 can be supplied by a first built-in battery 111 (dry battery, rechargeable battery, etc.), but preferably, for use in a vehicle, the battery of the vehicle is connected by a cigar plug cable C ₂ . However, it can be supplied from a commercial power source using an AC adapter. The power of the remote receiving device 200 is also supplied from the second internal battery 213. Also, at least the remote receiving device 200 is provided with a switch for turning on the power of the entire device.

FIG. 2 shows an overview of the hardware configuration of the communication system for a mobile phone terminal according to the present invention. First, the relay device 100 includes a main body 100a and a pedestal 100b. The main body 100a has an audio signal terminal 100c on a side surface (a right side surface, a left side surface, a back surface, or the like). The voice signal terminal 100c is an interface for connecting to the voice signal input / output terminal 300a of the mobile phone terminal 300 via the cable C _1, and relates to a voice signal of a communication partner of the mobile phone terminal 300. A jack or a connector for inputting an output voltage and outputting an audio signal related to a voice emitted by a speaker to the mobile phone terminal 300. The cable C ₁ is as long as it has a standardized jack at each end, but such commercially available headset cable or communication cable can be used, can be used even those that are not standardized. An infrared transmission window 100d is provided on the front of the main body 100a. The relay device 100 transmits an infrared signal obtained by converting the audio signal output voltage input from the mobile phone terminal 300 via the infrared transmission window 100d. The material of the housing of the relay device 100 may be any material such as plastic and synthetic resin, but preferably uses a material having excellent heat resistance.

The pedestal 100b is supported by a shaft 100e. The shaft 100e is provided with a spherical rotating body 100f at one end, and the rotating body 100e is held by a rotating body support leg 100g. Since the rotating body supporting leg 100g holds the rotating body 100f therein with a certain degree of friction or pressure, the main body a is normally stably fixed to the pedestal 100b. However, the main body 100a can be directed or inclined in any direction or angle within the rotatable range by the rotation of the rotating body 100f.

Since the remote receiving device 200 is used by being worn on the driver's ear, the remote receiving device 200 preferably has a shape as shown in FIG. That is, the main body 200a has a mounting device 200b for hanging on a human ear on a side portion thereof, and an infrared receiving window 200d is provided at a tip of the main body 200a. The attachment 200b is made of an elastic material such as rubber, a shape memory alloy covered with a film, or the like, which can easily change its shape by hand while maintaining a certain hardness. Can be. Further, the infrared receiving window 200d may have the same structure as the infrared transmitting window 100d of the relay device 100.

In the remote receiving apparatus 200, a second internal battery 213 of the same type as the first built-in battery can be accommodated in the battery insertion section 200e. The power supplied from the second built-in battery 213 spreads over the entire circuit of the remote receiving apparatus 200 when the power button 200c is pressed, and the remote receiving apparatus 200 The device is ready to receive an infrared signal to be transmitted. However, if the infrared signal is not received from the relay device 100 for a certain period of time, the power of the remote receiving device 200 is automatically turned off by technical means described later.

First, the relay device 100 will be described in detail. FIG. 3 is a block diagram thereof. First, the configuration of the power supply section will be described. Power of the relay apparatus 100 can supply from an external power source 110 cigar plug of automobiles through the cigarette plug cable C _2, and the like. Here, generally, the mobile phone terminal 300 currently on the market has a specification in which an output voltage (for example, about 2.6 volts) is generated at the audio signal input / output terminal 300a when an incoming call is received. ing. Part of the audio signal output by the cable C ₁ and the like from the audio signal input and output terminals 300a, is input through the audio signal pin 100c to the first main power supply control unit 112 of the relay device 100. In this specification, a part of the audio signal output voltage input to the first main body power supply control unit 112 may be particularly referred to as a “control signal”.

Then, the first main body power controller 112 compares the voltage value of the control signal with a reference voltage value (for example, 2.6 volts) set as a reference in advance. As a result, when the control signal voltage value exceeds the reference voltage value, the first main body power supply control unit 112 detects that the mobile phone terminal 300 has been operated (received a call). Using the detection result as a trigger signal, the power supplied from the external power supply 110 is provided to the entire circuit of the relay apparatus 100. As a result, the power of the relay apparatus 100 can be turned on automatically upon receipt of a call.

When the power of the relay device 100 is turned on as described above, the relay device converts the voice of the communication partner into an infrared signal by the following mechanism, and Send to A part of the audio signal output voltage appearing at the audio output terminal 300a due to the incoming call is attenuated to an appropriate level by an input attenuator (attenuator) 101 of the repeater 100. Is input to The automatic gain control unit 102 is provided to equalize the difference in the audio output voltage value caused by the difference in the manufacturer of the mobile phone terminal 300. Specifically, the automatic gain control unit 102 includes a gain control and an audio signal. A so-called automatic gain control circuit (Automatic Level Control: ALC circuit) including a rectifier diode and an amplifier can be applied.

The peak level of the audio signal that has passed through the automatic gain control unit 102 is limited by the amplitude limiting unit 103. This is an amplitude limiting circuit that does not unnecessarily expand the modulation band in the subsequent frequency modulation (FM modulation). Specifically, a limiter amplifier or the like can be applied, but it is not limited to this. Absent.

Then, this voice signal is input to FM modulation section 104, and changes the equivalent reactance of FM modulation section 104 according to the voice level of the other party of the call. As a result, the FM signal is directly applied to the high-frequency transmission amplifying section 105 in the subsequent stage, and the audio signal is power-amplified by the high-frequency transmission amplifying section 105 to control the optical transmission section 106 and to generate an infrared signal Sent out. Here, the high-frequency transmission amplifier 105 includes a high-frequency transmission circuit having a transmission frequency of, for example, 0.5 MHz, and a power amplifier circuit such as a power transistor or an FET. The optical transmission unit 106 transmits infrared light switched by an FM-modulated high-frequency signal to the outside. Specifically, a light-emitting element such as an infrared-emitting LED or a photodiode is used. Applicable, but not limited to these elements.

The voice input means 107 to which a condenser microphone or the like can be applied picks up the voice of the speaker involved in the call and converts it into an electric signal. The electrical signal, after being electrically amplified by the audio signal amplifier 108, is input to the audio signal input and output terminal 300a of the mobile phone terminal 300 via the cable C ₁ and the like. The audio signal input / output terminal 300a is a place where a commercially available wired headset, an earphone microphone, or the like is connected, and specifically, an interface such as a jack or a connector for inputting / outputting an audio signal corresponds to the audio signal input / output terminal 300a. .

The first built-in battery 111 is a battery or a storage battery such as a dry battery, a storage battery, a nickel-metal hydride battery, or a solar battery, and operates when the power supply from the external power supply 110 is cut off or stopped. , A spare battery for maintaining or compensating the operation of the relay apparatus 100, and may or may not be provided in the relay apparatus 100. Here, the vicinity of the power supply of the relay apparatus 100 will be described in detail. FIG. 4B illustrates a specific configuration of the first main body power supply control unit 112, the first internal battery 111, and the external power supply 110. For the sake of explanation, it is assumed that the power of the relay apparatus 100 is supplied from the first internal battery 111 and is not physically connected to the external power supply 110. The first main body power control section 112 has a power jack such as a DC jack, and the power jack has at least a first contact 112a, a second contact 112b, and a third contact 112c.

It is assumed that the initial state of the relay apparatus 100 is a power-off state. That is, in FIG. 4 (B), the third contact 112c is a state which is in contact with the second contact 112b, the voltage by the internal battery 111, the transistor Tr ₂ is turned off, still supplied to the entire device It is assumed that the state has not been performed. As described above, when an incoming call arrives at the mobile phone terminal 300, the mobile phone terminal 300 first sounds to urge the speaker (driver) to respond. At this time, generally, an output voltage is generated at the audio signal input / output terminal 300a of the mobile phone terminal 300 (the voltage value is not constant or varies depending on the model). The input of the output voltage (the control signal) to the first main body power supply control unit 112 means that the mobile phone terminal 300 receives an incoming call. Some of the output voltage is input to the transistor Tr _1, the transistor Tr ₁ is turned on. Then, since the next stage Trang register Tr ₂ is also turned on, the voltage supplied by the first built-in battery 111 is allowed to be transmitted to the entire circuit of each unit, the power supply of the relay device 100 is turned on .

On the other hand, when the initial state of the relay device 100 is a state in which the cigar plug cable C ₂ or the like is connected (inserted) to the external power supply 110, the first contact 112 a corresponds to the positive electrode (positive electrode). and, second contact 112b corresponds to the negative electrode (negative electrode), that is the second contacts 112b are dropped to the ground (earth), so that the power from the Shigapuraguke Buru C _2, etc. is supplied. At this time, since the third contact 112c is mechanically pushed by the insertion of the DC plug or the like, the third contact 112c is opened with the second contact 112b. As a result, the current discharge of the first built-in battery 111 stops (excluding spontaneous discharge). .

In particular, when power is supplied from a cigar plug of an automobile, the output voltage of the cigar plug is normally a 12 volt direct current (DC), and the 12 volt voltage is applied to the cigar plug cable. through C _2, stabilized by the voltage stabilization unit 112d to 6 volts, for example. When the initial state is turned off (when the transistors Tr ₁ and Tr ₂ are turned off), the voltage of 6 volts is not supplied to the entire circuit. At this time, since the voltage stabilizing unit 112d is a circuit that only outputs current, no current flows from the first internal battery 111. However, when the control signal from the mobile phone terminal 300 is input to the transistor Tr ₁ of the first main body power supply control unit 112 due to an incoming call, the control signal becomes a trigger signal and the transistor Tr ₂ Is turned on. As a result, the 6-volt voltage is supplied to the entire circuit, and the power of the relay apparatus 100 is turned on. As the voltage stabilizing unit 112d, specifically, a so-called power supply regulator element or the like can be used, but it is not limited thereto.

Conversely, when the audio signal output voltage of the mobile phone terminal 300 returns to the original state (zero) due to disconnection of the line of the called party or the like, the first main body power supply control unit of the relay apparatus 100 112 detects that the voltage has disappeared. That is, the first main body power control unit 112 detects that the control signal is no longer input. This becomes a trigger, resulting in the transistor Tr ₁ is turned off. Hence, followed by transistor T r ₂ is also turned off result, power of the relay apparatus 100 as a whole is turned off. Therefore, the relay apparatus 100 automatically turns on the power of the main body when there is an incoming call, and automatically turns off the power of the main body when the call ends.

The input attenuator 101 of the relay apparatus 100 may use a variable resistor (variable attenuator). In this case, by changing the resistance value of the variable resistor, the relay apparatus 100 can be suitably adapted to the audio signal output voltage that varies depending on the model of the portable telephone terminal 300.

Next, the remote receiving device 200 according to the present invention will be described in detail. FIG. 5 is a block diagram thereof. The power button 200c is not a toggle switch, but a switch having a structure that only opens and closes contacts while the button is simply pressed. Assume that the initial state of the remote receiving apparatus 200 is a state in which the second built-in battery 213 is built in and the power is off. The speaker presses the power button 200c only once. The reset unit 211 is turned on by inverting the previous off state. As a result, when the applicable second main body power control unit 212 such as a switching transistor is turned on, power is supplied to the entire remote receiving apparatus 200.

As a more specific configuration, a negative logic flip-flop circuit or a bistable multivibrator circuit as shown in FIG. However, it is not limited to these circuits. Here, it is assumed that a flip-flop circuit (hereinafter, referred to as an “FF circuit”) using a C-MOS type NAND gate, and a set (SET) and a reset (RESET) are inverted by inputting a negative logic LOW level signal. I do.

It is assumed that the initial state of remote receiving apparatus 200 is a state in which second internal battery 213 is not provided (that is, a state in which no battery is provided). Here, assuming that the speaker has mounted the second internal battery 213 such as a dry battery, a voltage is applied to the FF circuit. The skilled the FF circuit, the capacitor F ₃ as shown in FIG. 4 (A) is inserted into the ground. Therefore, since the reset signal input to the logic element L1 rises later than the set signal input to the logic element L2, a LOW level signal is input to the logic element L1. As a result, in the FF circuit, the output of the logic element L2 becomes LOW level. Therefore, since the circuit does not operate as a whole, no current flows and the circuit is still off.

That is, Q in FIG.₁The point is the resistance R₉LOW, Q_TwoPoints are HIGH. Q _Two The resistance R at the point voltage₇And capacitor F_ThreeThe reset input of the logic element L1 changes to HIGH after a certain time has elapsed after the power is turned on, due to the time constant represented by the product of: FIG. 8 shows a time chart of the voltage at this time.

Here, it is assumed that there is an incoming call to the mobile phone terminal 300. Then, the infrared signal related to the audio signal is transmitted from the relay device 100. In this state, if the intensity of the infrared signal is sufficient, when the power button 200c is momentarily pressed, the remote receiving apparatus 200 starts a receiving operation. At this time, Q ₁ A LOW level output is output at the point. When the received infrared signal falls below a certain level, Q₁The point becomes HIGH, but if it is above a certain level, Q₁Points are LOW, Q_TwoThe point becomes HIGH, and the reset input of the FF circuit is kept HIGH, so that the power supply of the whole circuit is kept ON.

Specifically, when the power button 200c is momentarily pressed, a LOW level signal is input as a “set signal” to the logic element (NAND element) L2 of the FF circuit. Since the FF circuit is used, once the set signal is input, even if the power button 200c is pressed again, the reset signal is input to the logic element (NAND element) L1 and the holding state of the FF circuit is inverted. Until the press is not valid. Here, the voltage of the second internal battery 213 is constantly applied to the FF circuit. However, since the logic elements (NAND elements) L1 and L2 of the FF circuit are of the C-MOS type, the present FF circuit is not used. Even when the remote receiver 200 is off, its power consumption can be almost ignored. Each of the logic elements (NAND elements) L1 and L2 may be a combination of a plurality of C-MOS type FETs (field effect transistors), or may be an IC (integrated circuit) or the like.

Even if the power button 200c is pressed in this state, only the set signal is accepted, so that the logic state of the FF circuit is not inverted. In this state, if the infrared signal for reception is momentarily interrupted, Q₁Since the voltage at the point changes from LOW to HIGH, Q_TwoAt that point it reverses and changes from HIGH to LOW. However, (R₇+ R ₈ ) F_ThreeTime constant is Q_ThreeQ to be in point_ThreeSince the descent time constant of the point becomes longer, the Q₁A HIGH level output at the point (a momentary interruption of the received signal) is not considered to be a reset signal input. The diode D_FiveDue to the presence of, there is no accumulation of the reduction level of the received signal strength.

On the other hand, when the infrared signal related to reception is completely cut off, at the point Q ₃ , when the time falls below the reset threshold voltage due to the time constant of (R ₇ + R ₈ ) F ₃ , After a certain period of time, it is assumed that the reset signal (LOW) has been input. As a result, the FF circuit is reset, and the power of the entire circuit is turned off.

Further, in a state not receiving an infrared signal from the first, when the user presses the power button 200c, the voltage of the point that is described as "receiving the infrared signal off" of Q ₃ points in FIG. 9, " since the same voltage as the power button 200c presses "point, after pressing, after approximately (R ₇ + R ₈₎ a timer time determined by F _3, a power supply is turned off. However, the timer time is not necessarily a value determined from the time constant of (R ₇ + R ₈ ) F ₃ , but may be a value proportional to the time constant.

Next, the optical receiving section 201 of the remote receiving apparatus 200 is for receiving an infrared signal related to the voice signal of the communication partner transmitted by the optical transmitting section 106 of the relay apparatus 100, and includes a photodiode Devices (infrared photodiodes, pin photodiodes) and the like are used with a reverse bias, but are not limited to these devices. When the infrared signal is input to the optical receiving unit 201, the received signal is amplified by the high frequency amplifying unit 202 having a sufficient gain. As the high-frequency amplifier 202, a so-called RF amplifier or the like can be applied, but the present invention is not limited to this. The tuning unit 203 is a filter circuit that passes only a high-frequency signal of a predetermined frequency. In this embodiment, the “predetermined frequency” is 0.5 MHz, but is not limited to this frequency in any case.

Then, the amplifying section 204 further amplifies the filtered signal, and limits the amplitude component of the signal to a constant value by a limiter circuit. The FM modulation component of the amplitude-limited signal is returned to the voltage amplitude component by the FM demodulation unit 205 at the subsequent stage. Since this voltage amplitude component is a low-frequency audio signal, it is amplified by the audio amplification unit 207 and output as an audio signal by the audio output unit 208 such as a speaker, so that the other party can talk to the speaker. You can hear audio.

Here, since the present invention performs infrared communication using FM modulation, for example, if an infrared signal is interrupted during a call or an obstacle or the like is placed on the infrared reception path, the reception is performed. , The input level according to. As a result, the output of the FM demodulation unit 205 has a large noise component other than the voice band. In order to suppress the noise component, a noise comparison unit 209 and a noise suppression processing unit 206 are provided to provide a clear voice with the noise component suppressed.

Specifically, the noise signal output from the FM demodulation unit 205 is filtered by the noise detection unit 209 a of the noise comparison unit 209 and is input to the noise amplification unit 209 b. Here, after being amplified and rectified by the noise rectifier 209c, the noise signal becomes a DC voltage (the noise component is detected as being large, and the DC output voltage level of a rectifier (not shown) increases). The comparison unit 209d determines whether the DC voltage is equal to or higher than a predetermined reference voltage value (2.6 volts in the case of the present embodiment). The comparison unit 209d is a so-called comparator (voltage comparator), and can use a Schmitt trigger circuit, an operational amplifier, or the like, but is not limited thereto. Here, when the DC voltage value related to the noise component exceeds the reference voltage value, the inverted output of the comparison unit 209d is applied to the noise suppression processing unit 206. Then, the noise suppression processing unit 206 operates to lower (or cut) the level of the audio signal. The noise suppression processing unit 206 is an attenuator circuit that operates using the output voltage of the noise comparison unit 209 as a trigger. As a result, the speaker can hear a clear voice in which noise during no signal (at the time of a weak signal) characteristic of FM modulation (demodulation) or FM communication is suppressed or cut. Therefore, in the remote receiving apparatus 200, the squelch function in FM demodulation can be realized by the noise comparing unit 209 and the noise suppression processing unit 206.

Next, a function of the remote receiving apparatus 200 for automatically turning off the power when the call is terminated will be described with reference to FIG. As described above, when the reception level is significantly reduced due to the failure of the infrared communication path, or when the reception is ended and the power of the relay device 100 is turned off and the reception level becomes zero, the comparison unit 209d Are output to the time measuring section 210. When the infrared communication path is disconnected, that is, when the noise level becomes high and the output of the comparing unit 209d continues for a certain period of time, the time measuring unit 210 sets the duration of the disconnection in advance. It detects when the set timer value (for example, 10 seconds) has expired, and outputs an output signal to the reset unit 211. Specifically, an output signal is input to the logic element (NAND element) L1 of the reset unit 211 (see FIG. 4A). Since the reset unit 211 is an FF circuit, the input signal becomes a reset signal. As a result, the base potential of the switching transistor of the second main body power control section 212 becomes HIGH level, and the power supply to the entire remote receiving apparatus 200 (circuit) connected to the collector is stopped. It is assumed that the output voltage of the collector is supplied as power for all circuits other than the second main body power controller 212. As described above, the power supply of the remote receiving apparatus 200 is automatically turned off after a certain period of time has elapsed after the call is ended (or disconnected).

Here, the time measuring unit 210 will be described in detail. The time measuring unit 210 is a timer circuit using a MOS inverter gate, and outputs a LOW level signal when a HI GH level signal is input continuously for a fixed time. I do. That is, the output voltage (HIGH level) of the comparison unit 209d increases the gate input voltage of the time measurement unit 210 according to a time constant uniquely determined by CR (the capacitance and resistance value of the used capacitor). When the voltage rises to the threshold voltage (threshold) of the gate, the inverter is inverted and a reset signal is output. If the output voltage of the comparison unit 209d goes to a LOW level at least once within a certain time, the charge of the capacitor is discharged through a diode connected in parallel with the resistor of the input circuit of the time measurement unit 210. The time measurement by this timer circuit is reset.

When the power button 200c of the remote receiving device 200 is pressed while the infrared signal from the relay device 100 is not received, the state of the reset unit 211 (FF circuit) is inverted. The remote receiving apparatus 200 is turned on, but receives no infrared signal at all, so that noise specific to FM modulation or the like is suppressed (or cut) by the noise suppression processing unit 206 or the like, and the same as described above. After the timer expires (for example, after 10 seconds), the power of the remote receiving apparatus 200 is turned off by the reset unit 211 and the second main body power control unit 212. The power button is preferably as large as possible so that the speaker can easily recognize it.

In the remote receiving apparatus 200 according to the present invention, the power is not turned off immediately after the infrared signal is cut off, but is turned off after a certain period of time. Grace time to prevent the power from being turned off and the call being forcibly cut off due to the vibration of the car or the change in the direction of the speaker, resulting in a loss of directional characteristics and obstacles in the infrared receiving path. It is for providing.

Next, as a preferred second embodiment of the present invention, a mobile phone of a type that supplies power to the relay device 100 by detecting and rectifying a transmission radio wave of the mobile phone terminal 300 to obtain a DC voltage. The terminal communication system will be described. The relay device 100 used in the present embodiment is preferably a housing to which the mobile phone terminal 300 can be attached and fixed. Specifically, a vertical housing as shown in FIG. 6 is used. . As shown in FIG. 6B, the housing of the relay device 100 according to the present embodiment includes a loop-shaped detection antenna of the detector 113 at a position just behind the built-in antenna of the mobile phone terminal 300. I do. In general, when a mobile phone terminal receives an incoming call, the mobile phone terminal transmits a radio wave of a certain strength because of establishing a common line signal link for communication control with the base station (when the internal battery is sufficient). Since the radio wave is continuously transmitted during a call, the detecting antenna detects (receives) the transmitted radio wave. Then, the radio wave is further converted into a DC voltage by a rectifier circuit at the subsequent stage, and the DC voltage is applied to the power supply of the relay device 100 according to the present invention.

Specifically, the transmission radio wave of the mobile phone terminal 300 received by the detection antenna is detected by a rectifier circuit such as Schottky diodes D ₃ and D _{4 of the} detector 113 shown in FIG. Rectified to voltage. The DC voltage, so the control signal described in the first embodiment (trigger signal), the result is input to the first main power supply control unit 112, the transistor Tr ₁ is turned on, followed by the main power supply control unit 112 of the transistor Tr ₂ is also turned on, the entire circuit of the relay device 100, the power being input supplied via the Shigapu lug cable C _2, and the like. For the audio signal, like the first embodiment, transfer the portable telephone terminal 300 of the audio signal output from said terminal 300a cable C ₁ and the like input attenuation unit 101 via, to the automatic gain control section 1 02 ...... Is done.

In the main body 100a of this embodiment, the distance between the horizontal plates 100j can be appropriately adjusted by rotating the knob 100k (see FIG. 6B). When the distance between the horizontal plates 100j is adjusted by attaching the mobile phone terminal 300, a mode as shown in FIG. 6A is obtained. The back plate of the main body 100a can be inclined in the front-rear direction, and a communication connector (RS-232C or a dedicated interface or the like) for a mobile phone terminal can be provided at the bottom.

Here, the reset unit 211 of the remote receiver 200 according to the present invention, which can be commonly used in the first embodiment and the second embodiment, can be realized by a FF circuit of a positive logic NAND. . This is because negative logic only becomes positive logic. Further, the reset unit 211 can be realized by a NOR circuit. This is because a NAND logic element can be realized by a combination of a NOR logic element and other logic elements, and can form logic equivalent to each other.

The communication system for a mobile phone terminal according to the present invention may apply FM radio waves or the like in addition to infrared rays. In addition, the external shape of the main body (or housing) of the relay device 100 and the remote receiving device 200 is not limited to the one disclosed in the present specification and the drawings in any case. Each part of the relay device 100 and the remote receiving device 200 according to the present invention may be provided in one chip by an IC or an LSI (super-integrated circuit). In addition, the present invention is particularly suitable for implementation in a car by supplying power from a cigar plug of the car via the cigar plug cable C ₂ or the like, but by using an AC / DC adapter, It can be implemented in any space, such as inside a building, office, or factory. Etc. cigar plug cable C ₂ and AC / DC adapter with cable is applicable commercially available ones, or a not standard products.

[0059]

[Effect of the invention]

 According to the invention of claim 1, in the remote receiving apparatus 200, not only the FM modulation is simply employed, but also the output noise peculiar to the FM modulation generated when there is no signal after the end of the call is detected and compared, and the power supply is detected. As a result of the control configuration, the power can be turned off automatically and reliably after the call ends, eliminating the need to turn off the power button to save power and dramatically reducing the chance of one-handed operation of the steering wheel. This has the effect of contributing to deterring driving aside. Further, as a result of being able to reliably turn off the power while not in a call, the frequency of replacing the battery of the remote receiving device 200 can be reduced, so that there is an advantage that the trouble of maintenance is not increased.

Further, the configuration is such that the power of the main body can be automatically and reliably turned off by using the audio output signal of the mobile phone terminal as a trigger, so that the main body is driven only by the built-in battery. Even in such a case, there is an advantage that power can be saved because the power is off while the user is not talking. Further, since there is no need to perform an operation of manually turning off the power of the main body, the chance of one-handed operation of the steering wheel can be drastically reduced, and the effect of contributing to suppression of aside driving can be obtained.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, it becomes possible to immediately cut out the specific noise associated with the FM modulation after the end of a call, and as a result, The remote receiver 200 is released from the noise without waiting for the power to be turned off after a certain period of time has elapsed, so that the driver is not bothered by the loud noise of the output noise during driving and continues to drive the vehicle safely. The effect that can be done.

According to the invention of claim 3, in the remote receiving apparatus 200, not only the FM modulation is simply adopted, but also the output noise peculiar to the FM modulation which occurs when a signal is lost after the end of a call. As a result, the power of the remote receiving apparatus 200 is controlled. As a result, the power of the remote receiving apparatus 200 can be automatically and reliably turned off after the call ends. This eliminates the need for off-operation, greatly reducing the chance of one-handed operation of the handle, and can contribute to the suppression of driving aside. Further, since the power of the remote receiving device 200 can be reliably turned off during a call, the frequency of replacing the battery of the remote receiving device 200 can be reduced, so that the maintenance work is not increased. There is also.

Further, the configuration is such that the power of the main body can be turned off automatically and reliably by using the voltage obtained by detecting the transmission radio wave of the mobile phone terminal as a trigger. Even when the mobile phone is driven by a mobile phone, the power is off while the user is not talking, so there is an advantage that power can be saved and an external power source can be completely unnecessary. Further, since it is not necessary to perform an operation of manually turning off the power of the main body, the chance of one-handed operation of the steering wheel can be drastically reduced, so that it is possible to contribute to the suppression of aside driving.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, it is possible to immediately cut out the specific noise associated with the FM modulation after the end of the call. Since the noise is released from the noise without waiting for the power of the remote receiver 200 to be turned off after a certain period of time has passed, the driver is not bothered by the loud noise of the output noise during driving and continues to drive the vehicle safely. The effect that can be done.

[Brief description of the drawings]

FIG. 1 is a diagram showing a use mode of a communication system for a mobile phone terminal according to the present invention.

FIG. 2 is a diagram showing the connection between the relay device and the remote receiving device according to the present invention and the mobile phone terminal;

FIG. 3 is a block diagram of the relay device according to the present invention;

FIG. 4A is a circuit diagram of a reset unit of the remote receiving device; FIG. 4B is a circuit diagram of a first main body power control unit of the relay device;

FIG. 5 is a block diagram of the remote receiving device of the present invention.

FIG. 6A is a perspective view when a mobile phone terminal is mounted on the relay device according to the second embodiment of the present invention; FIG. 6B is a perspective view of the relay device according to the second embodiment of the present invention; A perspective view when the terminal is detached

FIG. 7 is a circuit diagram illustrating a connection between a detection antenna, a detection unit, and a terminal operation detection unit and the like in the relay device according to the second embodiment of the present invention;

FIG. 8 is a time chart when a second built-in battery such as a battery is inserted into the remote receiver.

FIG. 9 is a time chart from when the power button of the remote receiving apparatus is pressed to when the power is automatically turned off after the end of the call.

[Explanation of symbols]

 Reference Signs List 100 relay device 107 voice input means 112 first power supply control unit 113 detection unit 200 remote receiving device 206 noise suppression processing unit 209 noise comparison unit 210 time measurement unit 211 reset unit 212 second Main unit power supply control unit 300: mobile phone terminal

Claims (4)

[Utility model registration claims] 1. A relay device for relaying an audio signal output from a mobile phone terminal to convert it into an infrared signal by FM modulation and transmitting the same, and receiving the infrared signal and converting the infrared signal into an F signal.
1. A communication system for a mobile phone terminal comprising: a remote receiving device that performs M demodulation and outputs a voice signal as a voice, wherein the relay device includes voice input means for picking up a voice uttered by a speaker, and control from the mobile phone terminal. A first main body power control unit for detecting that there is an incoming call to the mobile phone terminal by using a signal as a trigger, and controlling a power supply to the entire circuit of the relay apparatus in accordance with the detection result; The apparatus comprises: noise comparing means for comparing a voltage value of a noise component outside a voice band generated when the infrared signal is not received with a specified voltage value; A time measuring unit for outputting a reset signal, a reset unit for inverting a logic state in response to the input of the reset signal output from the time measuring unit, and a signal input from the reset unit Correspondingly second call system for mobile telephone terminal, characterized by comprising a main power supply control unit for controlling the power supply to the whole circuit of the remote receiver. 2. A relay device for relaying an audio signal output from a mobile phone terminal to convert it to an infrared signal by FM modulation and transmitting the same, and receiving the infrared signal and converting the infrared signal to F
1. A communication system for a mobile phone terminal comprising: a remote receiving device that performs M demodulation and outputs a voice signal as a voice, wherein the relay device includes voice input means for picking up a voice uttered by a speaker, and control from the mobile phone terminal. A first main body power control unit for detecting that there is an incoming call to the mobile phone terminal by using a signal as a trigger, and controlling a power supply to the entire circuit of the relay apparatus in accordance with the detection result; The apparatus comprises: noise comparing means for comparing a voltage value of a noise component outside a voice band generated when the infrared signal is not received with a specified voltage value; A time measuring unit for outputting a reset signal, a reset unit for inverting a logic state in response to the input of the reset signal output from the time measuring unit, and a signal input from the reset unit And a second main body power control unit for controlling power supply to the entire circuit of the remote receiving apparatus in response to the output voltage of the noise comparison means. A communication system for a mobile phone terminal, comprising: 3. A relay device for relaying an audio signal output from a mobile phone terminal, converting the signal into an infrared signal by FM modulation and transmitting the signal, and receiving the infrared signal and converting the infrared signal into an F signal.
A mobile telephone terminal communication system comprising: a remote receiving device that performs M demodulation and outputs a voice signal as a voice, wherein the relay device includes a voice input unit that picks up a voice uttered by a speaker, and a transmission radio wave of the mobile phone terminal. And a detector for detecting and rectifying the received radio wave to convert it into a DC voltage, and detecting that there is an incoming call to the mobile phone terminal by using the output voltage from the detector as a trigger, and A first main body power control unit for controlling power supply to the entire circuit of the relay apparatus in accordance with the detection result, wherein the remote receiving apparatus includes a noise component outside a voice band generated when the infrared signal is not received. A noise comparing means for comparing the voltage value of the noise with a prescribed voltage value, a time measuring section for outputting a reset signal when the output of the noise comparing means continues for a predetermined time, A reset unit whose logic state is inverted according to the input of the output reset signal, a second main body power control unit that controls power supply to the entire circuit of the remote receiving device according to a signal input from the reset unit; A communication system for mobile phone terminals, comprising: 4. A relay device for relaying an audio signal output from a mobile phone terminal to convert it to an infrared signal by FM modulation and transmitting the same, and receiving the infrared signal and converting the infrared signal to F
A mobile telephone terminal communication system comprising: a remote receiving device that performs M demodulation and outputs a voice signal as a voice, wherein the relay device includes a voice input unit that picks up a voice uttered by a speaker, and a transmission radio wave of the mobile phone terminal. And a detector for detecting and rectifying the received radio wave to convert it into a DC voltage, and detecting that there is an incoming call to the mobile phone terminal by using the output voltage from the detector as a trigger, and A first main body power control unit for controlling power supply to the entire circuit of the relay apparatus in accordance with the detection result, wherein the remote receiving apparatus includes a noise component outside a voice band generated when the infrared signal is not received. A noise comparing means for comparing the voltage value of the noise with a prescribed voltage value, a time measuring section for outputting a reset signal when the output of the noise comparing means continues for a predetermined time, A reset unit whose logic state is inverted according to the input of the output reset signal, a second main body power control unit that controls power supply to the entire circuit of the remote receiving device according to a signal input from the reset unit; A communication system for a mobile phone terminal, wherein the remote receiving device is provided with a noise suppression processing unit that suppresses or cuts noise peculiar to FM by using an output voltage of the noise comparison unit as a trigger.