JPH11331064A - Hand-free telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the radio 'hand-free telephone system' where power consumption is saved, even a single portable telephone set is in use and the portable telephone set can be reset. SOLUTION: The hand-free telephone system consists of a portable telephone set 2, a hand-free set 1, and a radio module 3. The hand-free set 1 is provided with a vibration signal sum means 17 that sums selectively a 1st vibration signal f1 and a 2nd vibration signal f2 to a voice signal on a transmission voice line placed from the hand-free set toward the portable telephone set, the radio module 3 is provided with a vibration signal extract means 34 that extracts the 1st vibration signal f1 and the 2nd vibration signal f2 from the voice signal and with a switching means 35 that switches on/off of a voltage level and/or a power supply B at control signal input output terminals 361, 362 of the portable telephone set based on the combination of the extracted 1st vibration signal f1 and 2nd vibration signal f2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free set-type telephone system for use in vehicles, homes, and the like, which uses a general-purpose mobile phone. The present invention relates to a hands-free telephone system that can reset a telephone.

[0002]

2. Description of the Related Art In recent years, automobile telephones have become extremely popular, and in addition to the conventional handset telephone system, a hands-free telephone system has been developed so that a driver can talk without releasing his / her hand from a steering wheel. .

[0003] Since this kind of car-dedicated telephone cannot be used once leaving the car, a general-purpose portable telephone is constructed so as to be connectable to a hands-free telephone set. Has been proposed that can be used as a mobile phone.

In applying a general-purpose mobile phone to a hands-free set type mobile phone system, the present applicant has previously proposed a wireless communication system between the mobile phone and the hands-free set.

[0005]

However, in a wireless hands-free telephone system in which a wireless module is mounted on a portable telephone, when a call is received on the portable telephone, the hands-free set picks up the telephone and outputs the received voice. Therefore, there is a problem that the power supply of the wireless module must be always turned on, and the battery life is short (so-called total standby time is short).

[0006] Also, in order to enter the hands-free mode,
By mounting the wireless module on the mobile phone, both of the two control signal input / output terminals provided on the mobile phone are set to the Lo level. In this case, the built-in speaker and the built-in microphone of the mobile phone can be used. When the wireless module is mounted, the mobile phone cannot be used alone, which is inconvenient.

Further, when the mobile phone malfunctions, the mobile phone is reset by setting one of the two control signal input / output terminals to Hi level.
When the wireless module is mounted on the mobile phone, as described above, both of the two control signal input / output terminals are at the Lo level, so that the mobile phone cannot be reset.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is a wireless hands-free telephone system that can save power, can be used alone by a mobile phone, and can reset a mobile phone. The purpose is to provide.

[0009]

In order to achieve the above object, a hands-free telephone system according to the present invention comprises a portable telephone (2), a hands-free set having an external speaker (12) and an external microphone (11). 1) and a wireless module (3) for performing wireless communication between the mobile phone and the hands-free set. In the hands-free telephone system, an audio signal of a transmission voice line from the hands-free set to the mobile phone is provided. A vibration signal adding means (17) for selectively adding a first vibration signal (f1) having a first waveform and a second vibration signal (f2) having a second waveform to the hands-free set; The first vibration signal (f1) and the second vibration signal (f2) are converted from a sound signal propagating through a transmission sound line from Vibration signal extracting means for exiting (34)
And a voltage level of a control signal input / output terminal (361, 362) of the mobile phone and / or the hands-free based on a combination of the first and second vibration signals extracted by the vibration signal extracting means. Switching means (3) for switching on and off the power (B) of a control signal line from the set to the mobile phone and a transmission audio line from the mobile phone to the hands-free set;
5).

In this case, the vibration signal adding means (17)
Is a control signal propagating through a control signal line from the mobile phone to the hands-free set and / or an operation switch (1) provided on the hands-free set.
4) The first and second vibration signals are selectively added based on the input signal from 4).

[0011] In the hands-free telephone system of the present invention,
The first vibration signal (f1) having the first waveform and the second vibration signal (f2) having the second waveform are added to the audio signal of the transmission audio line from the hands-free set to the mobile phone by the vibration signal adding means. Are selectively added, and the first vibration signal (f1) and the second vibration signal (f2) are extracted by the vibration signal extracting means. Then, based on the combination of the first and second vibration signals extracted as described above, the switching of the voltage level of the control signal input / output terminal of the mobile phone and / or the power supply provided to the wireless module is switched. As a result, up to four combined signals are realized, and power saving during standby can be achieved.
The mobile phone alone can be used, and the mobile phone can be reset.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a hands-free telephone system of the present invention, FIG. 2 is a front view showing a mobile phone and an adapter according to the embodiment, and FIG. 3 is an electric circuit diagram showing an electric configuration of the embodiment. FIG. 4 is a diagram for explaining a combination of signals to the control signal input / output terminal of the mobile phone 2.

First, the overall configuration of the car telephone system according to the present embodiment will be described. As shown in FIG. 1A, the system includes a hands-free set 1 mounted on a vehicle and a mobile phone carried by a user. It comprises a telephone 2 and a wireless module 3 for wirelessly communicating voice signals and data signals (control signals) between the hands-free set 1 and the mobile telephone 2.

The hands-free set 1 has a housing 10 in which an electric circuit board described later is built.
0 is installed, for example, in a place that does not interfere with the vehicle interior. Further, in place of the general housing 10, for example, a general-purpose can having a diameter of about 60 mm and a height of about 120 mm or a can having substantially the same shape as the general-purpose can can be used. In this case, the upper lid of the general-purpose can used for beverages can be appropriately removed and used, or a dedicated can formed in substantially the same shape as the general-purpose can can be used. This selection may be made according to the user's preference.

The housing 10 of the hands-free set 1 is provided with an external microphone 11 and an external speaker 12. The external microphone 11 is provided in a vehicle compartment, such as a sun visor, into which a driver's voice can be input.

The external microphone 11 is for inputting a voice of a driver or the like in place of the built-in microphone 22 of the mobile phone 2, and is input from the external microphone 11 by the wireless module 3 attached to the mobile phone 2. The driver's voice signal is transmitted to the mobile phone 2 via the control circuit of the hands-free set 1 and the wireless module 3, and a built-in control circuit (not shown) of the mobile phone 2
After the signal is processed by the built-in antenna 2
1 is sent to the other party.

On the other hand, the external speaker 12 is mounted in the vehicle interior or the like so that its sound output propagates into the vehicle interior. The external speaker 12 is a mobile phone 2
And outputs the voice from the other party in place of the built-in speaker 23. The radio wave signal from the other party received by the built-in antenna 21 is subjected to signal processing by the control circuit of the mobile phone 2 and then to the wireless module 3 The signal is output from the external speaker 12 to the vehicle interior via the control circuit of the hands-free set 1.

In this system, the hands-free set 1 and the mobile phone 2 are connected by a wireless module 3 using a long-wave to short-wave frequency band radio wave on the order of kHz to MHz. For this reason, Hands Free Set 1 includes
An antenna 13 (specifically, 13a to 13d) for transmitting and receiving to and from the mobile phone 2 and a control circuit for processing these transmitting and receiving signals are provided.

That is, as shown in FIG. 3, the voice signal of the driver input from the external microphone 11 of the hands-free set 1 is modulated and amplified by the voice modulator 151 and the high-frequency amplifier 152 into a radio signal on the order of MHz. After that, the signal is transmitted from the antenna 13a to the antenna 31a of the wireless module 3. This series of circuits constitutes a circuit for transmitting an audio signal from the hands-free set 1 to the wireless module 3.

On the other hand, the voice signal of the other party received by the mobile phone 2 is transmitted as an audio radio signal on the order of MHz from the antenna 31c of the wireless module 3 and received by the antenna 13c of the hands-free set 1. This audio radio signal is demodulated and amplified into an audio signal by the high-frequency amplifier 153 and the audio demodulator 154, and then output from the external speaker 12 to the room. This series of circuits constitutes a receiving circuit for audio signals from the wireless module 3 to the hands-free set 1.

Also, control signals other than audio signals are transmitted and received by similar radio signals. For example, hands-free set 1
Is provided with various operation switches 14, and an on-hook switch is input when making a call in a hands-free state or when a call is received. The switch input signal is modulated and amplified to a radio signal on the order of MHz by the modulator 155 and the high-frequency amplifier 156 via the control CPU 16, and then transmitted to the antenna 31b of the wireless module 3 via the antenna 13b. This series of circuits constitutes a control signal transmission circuit (uplink serial circuit) from the hands-free set 1 to the wireless module 3.

On the other hand, a control signal such as an incoming signal is also transmitted from the wireless module 3. Such a control signal is transmitted from the antenna 31 d of the wireless module 3 as a radio signal on the order of MHz, and is transmitted to the antenna 13 d of the hands-free set 1. Received at. The radio signal of the control signal is demodulated into a control signal by a high frequency amplifier 157 and a demodulator 158 and amplified, and then input to the control CPU 16. This series of circuits is a control signal receiving circuit (downstream serial circuit) from the wireless module 3 to the hands-free set 1.
Is configured.

On the other hand, the wireless module 3 for communicating the voice signal and the control signal from the mobile phone 2 and the voice signal and the control signal to the mobile phone 2 has an antenna 31.
In addition, a transmission circuit and a reception circuit are provided.

That is, as shown in FIG. 3, a radio signal on the order of MHz relating to sound transmitted from the antenna 13a of the hands-free set 1 is received by the antenna 31a of the wireless module 3, and is transmitted by the high-frequency amplifier 321 and the demodulator 322. After being demodulated and amplified, it is transmitted to the mobile phone 2. In the mobile phone 2, after being modulated to the frequency of the mobile phone 2, the signal is transmitted from the antenna 21 as a radio wave on the order of GHz. This series of circuits constitutes a receiving circuit for audio signals from the wireless module 3 to the mobile phone 2.

The antenna 1 of the hands-free set 1
The radio signal on the order of MHz relating to the control signal transmitted from the high-frequency amplifier 3b is received by the antenna 31b.
The signal is demodulated and amplified by the demodulator 23 and the demodulator 324 and then transmitted to the mobile phone 2. This series of circuits constitutes a control signal receiving circuit (uplink serial circuit) from the wireless module 3 to the mobile phone 2.

The voice signal of the other party received by the built-in antenna 21 of the mobile phone 2 is modulated and amplified into a radio signal on the order of MHz by the modulator 325 and the high-frequency amplifier 326 of the wireless module 3, and then the hand is transmitted from the antenna 31 c. The signal is transmitted to the antenna 13c of the free set 1. This series of circuits constitutes a circuit for transmitting an audio signal from the mobile phone 2 to the wireless module 3.

The control signal received by the antenna 21 of the portable telephone 2 is modulated and amplified into a radio signal on the order of MHz by the modulator 327 and the high-frequency amplifier 328 of the wireless module 3, and then the hands-free set is transmitted from the antenna 31d. 1 is transmitted to the antenna 13d. This series of circuits constitutes a control signal transmission circuit (downstream serial circuit) from the mobile phone 2 to the wireless module 3.

On the other hand, a conventionally known mobile phone 2 can be used. The mobile phone 2 has a built-in antenna 21, a built-in microphone 22, and a built-in speaker 23, and functions as a normal mobile phone when not set in the hands-free set 1.

In the hands-free telephone system according to the present embodiment, first, in order to control the mobile phone 2 itself, and second, to extend the life of the battery power source B of the wireless module 3,
The control signal is added to the audio signal from the hands-free set 1 to the wireless module 3.

That is, an oscillator 171 for generating a sine wave having a frequency of f1 and an oscillator 172 for generating a sine wave having a frequency of f2 are provided by an on / off switch 173,1.
The adder 175 is connected to the control CPU 16 via the control circuit 74, and is further provided in the audio transmission circuit. And
On / off switch 17 according to a command signal from control CPU 16
3 and 174 are connected, the connected oscillator 17
Sine waves of the above-mentioned frequencies f1 and f2 are added to the transmission audio signal from 1,172. These oscillators 171,
172, on / off switches 173, 174 and adder 17
5 constitutes the vibration signal adding means 17 of the present invention.

The vibration signal of the present invention generated by the oscillators 171 and 172 is not limited to the sine wave described above, but is a signal higher than the telephone carrier limit frequency (for example, 4 kHz) or lower than the audible frequency (for example, 20 Hz). If it is a signal, it can be used without any problem. In particular, it is desirable to use a sine wave because there is no high frequency.

On the other hand, the wireless module 3 is provided with vibration signal extracting means 34 for extracting sine waves of frequencies f1 and f2 from the audio signal sent from the hands-free set 1. This vibration signal extracting means 34
Is composed of two band-pass filters 341 and 343 connected in parallel to an audio transmission line extending from the antenna 31a to the connection terminal of the mobile phone 2, and RMS / DC converters 342 and 344 respectively connected thereto. ing.

The band pass filter 341 has a frequency f1
Is a circuit for extracting only the signal of the frequency f1.
Is converted to a voltage V1. Further, the band-pass filter 343 is a circuit for extracting only the signal of the frequency f2.
The voltage is converted to a voltage V2 by the MS / DC converter 344.

Two RMS / DC converters 342, 3
The voltage signals converted at 44 are respectively connected to switches 35
1, 352 are applied to control signal input / output terminals 361, 362 for controlling the mobile phone 2 itself. At the same time, two RMS / DC converters 34
The voltage signal converted at 2,344 is input to an AND circuit 353.
When the voltages V1 and V2 become equal, the switch 354 to the battery power supply B is closed (turned on). The switches 351, 352, the AND circuit 353, and the switch 354 constitute the switching means 35 of the present invention.

The oscillator 17 of the hands-free set 1
1 and 172 are transmitted from the control CPU 16.
Depending on whether the switches 173 and 174 are turned on or off based on the command from the CPU, they may or may not be added to the audio signal. FIG. 4 is a diagram showing a control mode based on a combination of the sine waves of the two frequencies f1 and f2.

First, in the case of the mobile phone in the standby mode, no signal is input from the mobile phone 2 to the hands-free set 1 of the downstream serial circuit.
The switches 173 and 174 of the oscillators 171 and 172 are turned on by a command signal from the control CPU 16 which detects this.
N, the frequency f1 is output from the oscillators 171 and 172.
And the sine wave of f2 is added to the transmission audio signal. This is connected to the band-pass filters 341 and 34 of the wireless module 3.
3 and converted into V1 and V2 voltage signals by RMS / DC converters 342 and 344.

As a result, the switches 351 and 352 are closed, and the control signal input / output terminals 361 and 362 of the mobile phone 2 are closed.
Are applied, the built-in microphone 22 and the built-in speaker 23 of the mobile phone 2 can be used, and the mobile phone 2 can be used separately from the hands-free set 1.

Since different voltage signals V1 and V2 are input to the AND circuit 353, the switch 354
Is opened, the power supplied from the battery power supply B to some of the transmission circuits and the reception circuits is cut off, and the energy saving mode is realized.

In the case of the hands-free mode shown in the middle part of FIG. 4, an incoming signal is input from the portable telephone 2 to the downstream serial circuit toward the hands-free set 1. The switches 173 and 174 of the oscillators 171 and 172 are opened (turned off), and the sine waves are not added from the oscillators 171 and 172. Therefore, no vibration signal is extracted by the band-pass filters 341 and 343 of the wireless module 3, so that the RMS / DC converter 342 and
The output voltages V1 and V2 at 344 become zero.

As a result, the switches 351 and 352 are opened, and the control signal input / output terminals 361 and 362 of the portable telephone 2 are opened.
The Lo signal is applied to any of the above, so that the built-in microphone 22 and the built-in speaker 23 of the mobile phone 2 cannot be used, which is a so-called hands-free mode. Since the same voltage signal of V1 and V2 is input to the AND circuit 353, the switch 354 is closed, and power is supplied from the battery power source B to some of the transmission circuits and the reception circuits.

In the reset mode of the portable telephone shown in the lower part of FIG. 4, the switch 173 of the oscillator 171 is closed and the switch 174 of the oscillator 172 is closed by a command signal from the control CPU 16 which detects the input signal from the operation switch 14. And open one oscillator 1
A sine wave of frequency f1 from only 71 is added to the transmission audio signal. The sine wave of the frequency f1 is extracted by the band-pass filter 341 of the wireless module 3, and is output from the RMS / D
It is converted into a voltage signal of V1 by the C converter 342. The output voltage V2 of the other RMS / DC converter 344 becomes zero.

As a result, one switch 351 is closed, and only the control signal input / output terminal 361 of the mobile phone 2 is set to H level.
While the i signal is applied, the other switch 352 is opened and the Lo signal is applied to the control signal input / output terminal 362. The reset (or power-off) of the mobile phone 2 can be executed by the combination of the signals.

By the way, the wireless module 3 having the above-mentioned electrical configuration is formed in an adapter shape as shown in FIG. 2, for example, and its connection terminal 33 is used as an input / output port for audio signals and control signals of the portable telephone 2. 24. In other words, the main circuit (the antenna 31, the receiving circuit, the transmitting circuit) and the battery power source B shown in FIG. If the wireless module 3 is configured to be detachable from the mobile phone 2 in the form of an adapter as described above, it is sufficient to mount the wireless module 3 when used as a hands-free system, and to remove the wireless module 3 when not required. it can.

In the hands-free telephone system according to the present embodiment, the portable telephone 2 to which the wireless module 3 is mounted is put in a bag as shown in FIG.
As shown in the figure, the vehicle is put into the hands-free state only by getting in the breast pocket, and when a call is received from outside, the conversation can be performed only by operating the on-hook switch (operation switch 14) of the hands-free set 1. Therefore, operations such as connector connection are not required, and convenience is remarkably improved.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

[0046]

As described above, according to the present invention, by adding two types of vibration signals to a transmission audio signal,
The mobile phone can be used independently of the hands-free set, and the mobile phone can be reset. Further, by adding such vibration signals, power saving in a standby state can be achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a hands-free telephone system according to the present invention.

FIG. 2 is a front view showing the mobile phone and the adapter according to the embodiment.

FIG. 3 is an electric circuit diagram showing an electric configuration of the embodiment.

FIG. 4 is a diagram illustrating a combination of signals to a control signal input / output terminal of the mobile phone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hands-free set 10 ... Housing 11 ... External microphone 12 ... External speaker 13 ... Antenna 14 ... Operation switch 16 ... Control CPU 17 ... Vibration signal addition means 2 ... Cellular phone 21 ... Antenna 22 ... Built-in microphone 23 ... Built-in speaker 3 ... Wireless module 31 ... Antenna 34 ... Vibration signal extraction means 35 ... Switching means B ... Battery power supply

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04B 7/26 109G (72) Inventor Kohei Hashimoto 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Corporation (72) Invention Person Hiroaki Saito Calsonic Corporation 5-72-15 Minamidai, Nakano-ku, Tokyo (72) Inventor Yasuhisa Nakahara 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Corporation

Claims (2)

[Claims] 1. A hands-free telephone system comprising: a mobile phone; a hands-free set having an external speaker and an external microphone; and a wireless module for performing wireless communication between the mobile phone and the hands-free set. Vibration signal adding means for selectively adding a first vibration signal having a first waveform and a second vibration signal having a second waveform to an audio signal of a transmission audio line from the freeset to the mobile phone; A vibration signal extracting unit that extracts the first vibration signal and the second vibration signal from a sound signal that propagates through a transmission sound line from the hands-free set to the mobile phone; The first and second extracted
And / or a control signal line from the hands-free set to the mobile phone and a transmission from the mobile phone to the hands-free set based on the combination of the vibration signals. A hands-free telephone system comprising: switching means for switching on / off the power of the voice line. 2. The vibration signal adding means according to a control signal transmitted through a control signal line from the portable telephone to the hands-free set and / or an input signal from an operation switch provided in the hands-free set. 2. The hands-free telephone system according to claim 1, wherein said first and second vibration signals are selectively added.