JP2000022808A - On-vehicle telephone system and portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle telephone system by which a portable telephone set can be placed at arbitrary place and appearance on the interior of a vehicle and the portable telephone set are not damaged, and to provide the portable telephone set suitable for the on-vehicle telephone system. SOLUTION: A reception signal is demodulated into a sound signal by a CODEC (code modulation coder/decoder) 42. It is amplified in an AMP 44, is outputted to an infrared modulation part 46 through a switching part 45 and is modulated into a light emitting signal. Then, a transmission lamp 320 emits a light signal based on the light emitting signal. When the light signal is received by the light reception part 50 of the sound output device 5, it is converted into a light reception signal, is demodulated into a sound signal in an infrared demodulation part 62 and sound is outputted from a speaker 68 in accordance with the sound signal. Namely, an on-vehicle telephone system transmits/receives the light signal between the transmission lamp 320 and the light reception part 50 and therefore sound obtained by demodulating the reception signal can be outputted from the speaker 68 even if a portable telephone set 3 is placed at any place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle telephone device using a portable telephone.

[0002]

2. Description of the Related Art Conventionally, a portable telephone has a function of receiving a reception signal from a base station and a function of transmitting a transmission signal to the base station, and outputs a sound obtained by demodulating the reception signal from a speaker installed in the vehicle. On the other hand, an on-vehicle telephone device that collects a voice of a speaker to be modulated into a transmission signal by a microphone having high sound collecting properties installed in a vehicle has become widespread.

FIG. 4 is a schematic diagram of a typical example of the above-mentioned on-vehicle telephone device. First, as shown in FIG.
00 and a fixing box 101 for fixing the mobile phone 200. The fixed box 101 has a built-in speaker 102 for converting a voice signal into a voice and outputting the voice signal, and a microphone 103 for collecting a voice of the speaker and converting the voice signal into a voice signal is attached via a cable 110. ing.

Further, an audio signal from the microphone 103 is input to the fixed box 101 to the portable telephone 200,
A connector 112 for inputting an audio signal output from the mobile phone 200 to the speaker 102 is attached via a communication cable 111.

[0005] The vehicle-mounted telephone device 100 configured as described above.
Is installed by fixing the fixed box 101 to the console box A and fixing the microphone 103 to the sun visor. The transmission cable 110 extending from the fixed box 101 to the microphone 103 is installed inside a structure constituting the vehicle.

[0006] The vehicle-mounted telephone device 100 is mounted on the fixed box 101 installed in this manner.
Is used with the communication cable 111 connected to the connector 104 of the mobile phone 200. FIG.
As shown in (b), instead of the communication cable 111, the portable telephone 200a and the fixed box 101a are connected to each other by a joint 10 capable of transmitting and receiving a voice signal.
There is also an in-vehicle telephone 100a provided with a 5a. Note that the other configuration is the same as that of the above-described in-vehicle telephone device 100, and thus the description is omitted.

In such a vehicle-mounted telephone 100a, when the portable telephone 200a is fixed to the fixing box 101a, the joint 105a is fitted to the portable telephone 200a.
The portable telephone 200a and the fixed box 101a (specifically, the speaker 102a and the microphone 1)
03a).

[0008]

However, in the above-mentioned in-vehicle telephone devices 100, 100a, the portable telephones 200, 200
Since a is not always installed in the fixed boxes 101 and 101a, there is a problem that the portable telephones 200 and 200a and the fixed boxes 101 and 101a have to be attached and detached each time, which is troublesome. Especially communication cable 1
11 is attached to the connector 104, the portable telephone 200 is fixed to the fixed box 101.
In addition to the work of fixing the connector 112,
I had to do the work of attaching it to 04.

Further, the above-mentioned on-board telephone devices 100, 10
In the case of 0a, the transmission cables 110, 110a have to pass through the inside of the structure constituting the vehicle from the fixed boxes 101, 101a to the microphones 103, 103a, and there is a problem that the mounting work to the vehicle is troublesome. In particular, the transmission cables 110, 110a
Transmission cables 110 and 11
Since it is necessary to mount the Oa barely inside the vehicle, this has been a cause of impairing the aesthetics of the vehicle.

Further, the above-mentioned on-board telephone device 100, 1
00a, the mobile phone 200, 200a must be provided with the connector 104 and the joint 105a.
There is a problem that the aesthetic appearance of the portable telephones 200 and 200a is impaired. In view of the above, the present invention provides an in-vehicle telephone device in which a portable telephone can be placed at an arbitrary place and which does not impair the aesthetics of the vehicle and the portable telephone, and a portable telephone suitable for the in-vehicle telephone device. The purpose is to do.

[0011]

According to a first aspect of the present invention, there is provided an on-vehicle telephone having a portable telephone and a voice output device. In the vehicle-mounted telephone device according to the first aspect, first, in the portable telephone, the received signal received from the base station is demodulated into a voice signal by the received signal demodulation means, and the voice signal is further converted by the optical signal conversion transmission means. The signal is converted into an optical signal, and the optical signal is output to the audio output unit corresponding to the peripheral device described above. Then, the optical signal received by the audio output means is demodulated again into an audio signal, and the audio is output according to the audio signal.

That is, in the vehicle-mounted telephone device according to the first aspect, since the portable telephone and the audio output device communicate with each other by an optical signal and output the audio from the audio output device, the audio output means is provided. As long as the optical signal can reach the portable telephone, the portable telephone can output sound based on the received signal from the sound output means everywhere. Therefore, since it is not necessary to fix the mobile phone at a specific position as in the case of the conventional vehicle-mounted telephone device, the user can place the mobile phone in any convenient place (for example, a juice holder, a shirt pocket, etc.). Can be. In particular, the in-vehicle telephone device according to claim 1 is most suitable for a one-box car or the like that does not have a console box, which is often selected as a place where a portable telephone is fixed.

Further, unlike the conventional vehicle-mounted telephone device, there is no need to provide a device for fixing the portable telephone (for example, the above-mentioned fixed box or a detachable device for fixing the portable telephone to the fixed box). Therefore, the overall cost of the vehicle telephone device can be reduced.

Further, since communication between the portable telephone and the audio output device is performed by using an optical signal, a communication cable is stretched in the vehicle as in a conventional vehicle-mounted telephone device. It does not impair the aesthetics in the car. The portable telephone may be not only a so-called portable telephone but also a PHS or a handy type wireless device.

[0015] Further, in the above-mentioned invention of claim 1,
Sound is collected directly by the mobile phone, but if you can attach a microphone to the mobile phone,
It does not prevent the transmission signal sound from being collected from the sound collection microphone. Next, according to a second aspect of the present invention, in the vehicle-mounted telephone device according to the first aspect, the portable telephone is formed of a material that transmits light, and covers a call-indicating lamp for notifying the reception of the reception signal. The optical signal conversion transmitting unit transmits the optical signal through the display window.

If the optical signal is transmitted using the display window as in the vehicle telephone apparatus according to the second aspect, the aesthetic appearance of the portable telephone is not impaired. By the way, a microphone built into a mobile phone is usually set so that an audio signal of an appropriate size is output when the voice of the mouth is picked up. However, when the mobile phone is used as an in-vehicle phone device, However, since it is necessary to collect sound from a place away from the portable telephone, a sufficiently large sound signal may not be output in some cases.

Therefore, in the vehicle telephone device according to the third aspect, the vehicle telephone device according to any one of the first and second aspects,
The transmitting signal converting means includes an audio signal amplifying means for variably amplifying an audio signal obtained by converting the collected voice, and an amplification factor of the audio signal amplified by the audio signal amplifying means, which is set to a use state of the portable telephone. Switching means for switching according to
The audio signal amplified by the audio signal amplifier is converted into the transmission signal.

According to the third aspect of the present invention, the audio signal is amplified by the audio signal amplifying means at an amplification factor according to the use state of the portable telephone. That is, by using the vehicle-mounted telephone device according to the third aspect, it is possible to output an audio signal of an appropriate size by adjusting the amplification factor,
It is possible to reliably collect necessary voices away from the portable telephone.

Therefore, when the portable telephone is used as the vehicle-mounted telephone device by using the vehicle-mounted telephone device according to the third aspect, if the amplification factor is set to be increased and used, the switching means simply switches the amplification ratio. The portable telephone can be used as an in-vehicle telephone device with a simple operation.

The amplification factor of the audio signal amplifying means may be switched by providing a switch on the portable telephone and operating the switch or by any other method. Further, the vehicle includes a notification signal transmitting device for transmitting a notification signal for notifying that the mobile phone is in the vehicle, and when the audio signal switching unit receives the notification signal, the amplification factor is set to The amplification factor may be switched by using automatic switching means for automatically increasing the gain. When such an automatic switching means is used, the amplification rate of the portable telephone is always large in the vehicle, and a required sound at a remote place can be reliably collected. If the mobile phone always functions as an in-vehicle phone device when entering the vehicle in this way, it is not necessary to go directly to the mobile phone while driving the vehicle. Unsafe acts can be prevented beforehand.

A portable telephone suitable for the above-mentioned on-vehicle telephone device is a receiving signal demodulating means for demodulating a received signal from a base station into a voice signal, In the portable telephone comprising a transmission signal conversion means for converting the audio signal into a transmission signal, modulating the audio signal into a transmission signal, and converting the audio signal demodulated by the reception signal demodulation means into an optical signal, It is preferable to provide an optical signal conversion / transmission means for transmitting the optical signal to the outside.

In the portable telephone according to the fourth aspect of the present invention, as in the portable telephone according to the fifth aspect, an incoming call indicator lamp formed of a material that transmits light and notifying the reception of the reception signal is provided. Preferably, a display window is provided, and the optical signal conversion / transmission unit transmits the optical signal through the display window.

Further, in the portable telephone according to any one of the fourth and fifth aspects, as in the portable telephone according to the sixth aspect, the transmission signal converting means converts an audio signal obtained by converting the collected sound. An audio signal amplifying means for variably amplifying, and a switching means for switching an amplification factor of the audio signal amplified by the audio signal amplifying means in accordance with a use state of the portable telephone, wherein the audio signal output from the audio signal amplifying means is provided. It is preferable to convert an audio signal into the transmission signal.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the invention described above will be described below. [First Embodiment] Here, FIG. 1 is a schematic configuration diagram of an in-vehicle telephone device using a portable telephone, and FIG. 2 is a circuit diagram thereof.

First, the vehicle-mounted telephone device 1 of the first embodiment is
As shown in FIG. 1, a portable telephone 3 and an audio output device 5
It is composed of The portable telephone 3 includes an antenna 30 for transmitting and receiving radio waves to and from the base station, an incoming call display lamp for displaying an incoming call from the base station by emitting light, and a transmitting lamp for transmitting an optical signal described later. A display window 32 that covers (not shown) and a microphone 34 that converts collected sound into an audio signal are provided.

On the other hand, the sound output device 5 receives a light signal of the transmission lamp and converts the light signal into a light reception signal which is an electric signal, and converts the light reception signal converted by the light reception unit 50 into a sound signal. And an audio output unit 60 for outputting audio based on the audio signal.

Here, FIG. 2A is a block diagram showing the internal configuration of the portable telephone 3, and FIG.
FIG. 3 is a block diagram illustrating an internal configuration of the device. In addition, the block diagram of the portable telephone 3 of FIG. 2A shows only a configuration necessary for the vehicle-mounted telephone device 1 of the present embodiment.

First, as shown in FIG. 2, the portable telephone 3 has a changeover switch 4 operable by an operator.
The audio signal amplification unit 40 is configured to be capable of switching the amplification factor of the audio signal in accordance with the operation 1, and amplifies the audio signal output from the microphone 34. The audio signal amplified by the audio signal amplification unit 40 is modulated. A CODEC (code modulation coder decode) that generates a transmission signal to be transmitted to the base station via the antenna 30 and demodulates a reception signal received from the base station via the antenna 30 to generate an audio signal.
r) 42 and D which functions as a so-called echo canceller for transmission / reception signals input / output to / from this CODEC 42.
An SP (Digital Signal Processor) 43 is provided.

Further, the portable telephone 3 is provided with the CODEC
An amplifier (hereinafter, referred to as "AMP") 44 for amplifying the audio signal demodulated in 42, and an infrared modulation for modulating the audio signal amplified by the AMP 44 into a light emission signal for converting into an optical signal composed of infrared light. Unit 46, a transmission lamp 320 that emits an optical signal based on the emission signal, and an audio signal output from the AMP 44 in accordance with an operation of the changeover switch 41, which is output to either the speaker 47 of the portable telephone 3 or the infrared modulation unit 46. On one side, a switching unit 45 capable of outputting is provided.

On the other hand, the audio output unit 6 of the audio output device 5
0 is an infrared demodulation unit 62 for demodulating a light reception signal converted by the light reception unit 50 into an audio signal, an AMP 64 for amplifying and outputting the audio signal demodulated by the infrared demodulation unit 62, and an audio signal for amplification by the AMP 64 A volume switch 66 for changing the amplification factor of the AMP 64 and a speaker 68 for outputting sound according to the sound signal output from the AMP 64 are provided.

The changeover switch 41 is operated by the operator in a portable mode when the portable telephone 3 is used alone, and in a vehicle-mounted telephone when the portable telephone 3 is applied to the vehicle-mounted telephone device 1. The mode can be switched freely. When the changeover switch 41 is switched to the portable mode, the portable telephone 3 is switched so that the audio signal amplifying unit 40 amplifies the audio signal output from the microphone 34 with a minimum amplification factor. AMP4
When the switch 41 is switched to the vehicle-mounted telephone mode, the audio signal amplifying section 40 switches the audio signal output from the microphone 34 to the maximum amplification factor. And the switching unit 45 is configured to output the audio signal output from the AMP 44 to the infrared modulation unit 46.

In the on-vehicle telephone device 1 configured as described above, when the changeover switch 41 is set to the on-vehicle telephone mode, a reception signal received from the base station via the antenna 30 is input to the CODEC 42 via the DSP 43. The signal is demodulated by the CODEC 42 into an audio signal. Next, this audio signal is amplified by the AMP 44 and then output to the switching unit 45. Since the changeover switch 41 is in the vehicle-mounted telephone mode, the audio signal is further output from the switching unit 45 to the infrared modulation unit 46 to output infrared light. It is modulated into a light emission signal. The light emission signal is output to the transmission lamp 320, and the transmission lamp 320 emits an optical signal based on the light emission signal.

When the optical signal transmitted from the transmitting lamp 320 is received by the light receiving section 50 of the audio output device 5, the optical signal is converted into a light receiving signal. Then, the received light signal is demodulated into an audio signal by the infrared demodulation unit 62, and based on the amplification factor designated by the volume switch 66,
After being amplified by the MP 64, the signal is output to the speaker 68, and finally, the sound is output from the speaker 68 according to the sound signal.

On the other hand, when the changeover switch 41 is set to the portable mode, the audio signal demodulated by the CODEC 42 is
After being amplified by the AMP 44, the signal is output to the switching unit 45, and is output from the switching unit 45 to the speaker 47 because the changeover switch 41 is in the portable mode. Then, a sound is output from the speaker 47 based on the sound signal.

Next, when the changeover switch 41 is set to the vehicle-mounted telephone mode, the voice signal obtained by converting the voice collected by the microphone 34 is amplified by the voice signal amplifying unit 40 at the optimum amplification factor in the vehicle-mounted telephone mode. After that, CODEC4
In step 2, the signal is modulated into a transmission signal. And the transmission signal is D
A known process for canceling the echo is performed in SP43, and the result is output to the base station via the antenna 30.

On the other hand, when the changeover switch 41 is set to the portable mode, the audio signal obtained by converting the sound collected by the microphone 34 is amplified by the audio signal amplifying unit 40 at an optimum small amplification factor in the portable mode. , CODEC 42 modulates the transmission signal. When the changeover switch 41 is switched to the portable mode, the reason why the amplification factor of the audio signal amplifying unit 40 is small is that the user of the portable telephone 3 normally holds the portable telephone 3 in the portable mode. This is because the sound is emitted in the vicinity of the microphone 34, so that the sound signal collected and converted by the microphone 34 can be set to a size suitable for a call without amplifying the sound signal so much.

On the other hand, when the changeover switch 41 is switched to the vehicle-mounted telephone mode, the amplification factor of the audio signal amplifying unit 40 is large because the audio signal generated by collecting and converting the audio generated at a distance from the microphone 34 is output. This is because, since it is weak, it is necessary to make the size suitable for a call.

That is, in order to use the portable telephone 3 as the vehicle-mounted telephone device 1, first, the changeover switch 41 is switched to the vehicle-mounted telephone mode, and the optical signal transmitted from the transmission lamp 320 is transmitted as shown in FIG. What is necessary is just to put it in the juice holder 7 etc. which hold the juice etc. in the range which reaches the light-receiving part 50, for example.

Then, the received signal received by the portable telephone 3 is output as a sound from the speaker 68, while the sound collected by the microphone 34 is reliably picked up because it is amplified at the maximum amplification factor. Then, it is converted into a transmission signal and transmitted to the base station. On the other hand, when the portable telephone 3 is used as itself, the changeover switch 41 may be switched to the portable mode. Then, the received signal received by the mobile phone 3 is output as a sound from the speaker 47 and the microphone 3
The voice collected at 4 is amplified with the minimum amplification factor, converted into a transmission signal, and transmitted to the base station.

When the above-described vehicle telephone device 1 is used,
The following effects are obtained. In-vehicle telephone device 1 of the present embodiment
Transmits and receives an optical signal between the transmission lamp 320 and the light receiving unit 50, and causes the portable telephone 3 to output a sound obtained by demodulating the received signal from the speaker 68 anywhere.
In addition, since the audio signal is amplified by the audio signal amplifying unit 40 at an appropriate amplification factor, it is possible to reliably pick up the voice emitted by the speaker.

Therefore, unlike the conventional in-vehicle telephone device 1, the in-vehicle telephone device 1 of the present embodiment does not fix the portable telephone 3 but places the portable telephone 3 in a place where the user of the in-vehicle telephone device 1 wants to place. Can be placed. Further, the in-vehicle telephone device 1 according to the present embodiment is similar to the in-vehicle telephone device according to the related art.
(For example, the above-mentioned fixing box or a detachable device for fixing the mobile phone 3 to the fixing box), there is no need to provide a manufacturing cost.

Next, in the vehicle-mounted telephone device 1 of this embodiment, the transmission lamp 320 for transmitting the optical signal transmits the optical signal through the display window 32 conventionally provided for the incoming call display lamp. Mobile phone 200
There is no need to add a new configuration to the outside of the portable telephone 3, so that an optical signal can be transmitted without impairing the appearance of the portable telephone 3.

The switching of the changeover switch 41 may be performed by the user of the portable telephone 3 as described above, or may be performed in any other manner. For example, a notification signal transmitting device for transmitting a notification signal for notifying that the mobile phone 3 is in the vehicle is provided in the vehicle. When the notification signal is received by the mobile phone 3 instead of the changeover switch 41, the voice signal is output. The audio signal amplifying unit 40 and the switching unit 45 are automatically set so that the amplification factor of the audio signal amplified by the signal amplifying unit 40 is automatically increased and the audio signal output from the switching unit 45 is output to the infrared modulation unit 46. An automatic switching means for switching to.

The automatic switching means is used as the portable telephone 3
In the vehicle, the mobile phone 3 always has a high amplification factor, so that it is possible to pick up sound from a distant place, and the sound converted from the received signal is always output from the speaker 68. Therefore, even if a call is received by the portable telephone 3 while the vehicle is running, the portable telephone 3 placed in the vehicle always functions as the vehicle-mounted telephone device 1, so that the portable telephone 3 is directly held while driving. Can be prevented beforehand.

The portable telephone 3 is provided with a changeover switch 41
And an automatic changeover switch. by the way,
The antenna 30 and the CODEC 42 of this embodiment correspond to the reception signal demodulating means of the present invention, and the microphone 34 and the CODEC 4
2 corresponds to the transmission signal modulation means of the present invention, the infrared modulation section 46 and the transmission lamp 320 correspond to the optical signal conversion and transmission means, and the audio signal amplification section 40 and the changeover switch 41 correspond to the audio signal amplification means of the invention. I do.

In the vehicle-mounted telephone device 1 of this embodiment, the light receiving unit 50 and the sound output unit 60 are separated from each other, and the light receiving unit 50 is attached to the sun visor. If the location can be received, the light receiving unit 5
0 may be provided near the audio output unit 60, or the light receiving unit 50 and the audio output unit 60 may be integrally configured.

This eliminates the need for a communication line connecting the light receiving unit 50 and the audio output unit 60. Therefore, by extending the communication line inside the vehicle as in a conventional vehicle-mounted telephone device, the appearance in the vehicle is impaired. Nothing. [Second Embodiment] As in the second embodiment, the portable telephone 3 is mounted in the fixed box 90 as described in the section of the prior art.
May be fixed.

FIG. 3 is a schematic diagram showing the construction of the vehicle telephone system 2 according to the second embodiment. In this case, the fixed box 9
Since the only difference is that the light receiving unit 50 is provided in FIG. However, when the mobile phone 3 is fixed to the fixed box 90 as described above, a concave portion is provided in the mobile phone 3, a changeover switch 41 is provided at a bottom portion of the concave portion, and the mobile phone is fixed to the fixed box 90. At this time, a convex portion that is inserted into the concave portion and that switches the changeover switch 41 to increase the amplification factor may be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an in-vehicle telephone device according to a first embodiment.

FIG. 2 is a circuit diagram of the vehicle telephone device according to the first embodiment.

FIG. 3 is a schematic diagram configuration of an on-vehicle telephone device according to a second embodiment.

FIG. 4 is an external view of a vehicle-mounted telephone device using a conventional portable telephone.

[Explanation of symbols]

Reference numerals 1, 2, on-vehicle telephone device, 3, portable telephone, 5, audio output device, 30, antenna, 32, display window, 34, microphone, 40, audio signal amplifier, 41, changeover switch, 42
... CODEC, 43 ... DEP, 44 ... AMP, 45 ... Switching unit, 46 ... Infrared modulation unit, 47 ... Speaker, 50 ... Light receiving unit, 60 ... Sound output unit, 62 ... Infrared demodulation unit, 64 ...
AMP, 66 ... volume switch, 68 ... speaker,
90: fixed box, 320: transmission lamp

Claims (6)

[Claims] 1. A receiving signal demodulating means for demodulating a received signal from a base station into a voice signal, converting the collected voice into a voice signal, modulating the voice signal into a transmission signal, and transmitting the voice signal to the base station. An on-vehicle telephone device using a portable telephone having signal conversion means, wherein the portable telephone converts the audio signal demodulated by the reception signal demodulation means into an optical signal and transmits the optical signal to the outside. Audio output means for receiving the optical signal from the optical signal conversion and transmission means, demodulating it into the audio signal, and outputting audio in accordance with the audio signal, separately from the portable telephone; An in-vehicle telephone device comprising: 2. The in-vehicle telephone device according to claim 1, wherein the portable telephone includes a display window formed of a material that transmits light, and covering a reception indicator lamp for notifying reception of the reception signal. The on-vehicle telephone device, wherein the optical signal conversion transmitting unit transmits the optical signal through the display window. 3. The on-vehicle telephone device according to claim 1, wherein said transmission signal conversion means variably amplifies an audio signal obtained by converting a collected voice, and said audio signal. Switching means for switching an amplification factor of an audio signal to be amplified by the amplification means according to a use state of the mobile phone, wherein the audio signal amplified by the audio signal amplification means is converted into the transmission signal. On-board telephone device. 4. A receiving signal demodulating means for demodulating a received signal from a base station to a voice signal, converting the collected voice into a voice signal, modulating the voice signal into a transmission signal, and transmitting the signal to the base station. A portable telephone comprising: a signal conversion unit; and an optical signal conversion transmission unit that converts the audio signal demodulated by the reception signal demodulation unit into an optical signal and transmits the optical signal to the outside. Type telephone. 5. The portable telephone according to claim 4, further comprising: a display window formed of a material that transmits light, and covering a reception indicator lamp for notifying the reception of the reception signal, wherein the optical signal conversion / transmission means is provided. A portable telephone, wherein the optical signal is transmitted through the display window. 6. The portable telephone according to claim 4, wherein the transmission signal conversion unit variably amplifies an audio signal obtained by converting a collected voice, and the audio signal. Switching means for switching an amplification factor of an audio signal to be amplified by the amplification means in accordance with a use state of the mobile phone, wherein the audio signal output from the audio signal amplification means is converted into the transmission signal. Mobile phone.