JPH0419875Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a hands-free telephone for a car equipped with an air conditioner.

(Conventional technology) Conventionally, the handset (transceiver) of a car phone
is stored, for example, in a console box in the center of the front seat, and passengers take it out to communicate with other stations. However, when a driver uses a handset to communicate with a partner station while driving a car, driving the car and operating the telephone at the same time poses a safety problem, and it is difficult for the driver to operate the telephone without picking up the handset. is desirable. Therefore, instead of a handset, I installed a speaker and microphone on the instrument panel in front of the driver's seat.
It has been proposed that the selection of the other party's station, calling, and ending the call can be done by operating a group of switches on a remote control panel located near the driver's seat.

(Problem that the invention aims to solve) In a car equipped with an air conditioner, if the microphone of a hands-free telephone is installed near the blower outlet of the air conditioner, the noise and air discharged from the blower will directly hit the microphone during a call. There is a problem in that noise gets mixed in and the quality of the call deteriorates.

The present invention has been developed to solve this problem, and improves the S/N ratio during calls by eliminating the need to operate a switch to adjust the blower air volume of the air conditioner every time a hands-free telephone call is made. The purpose is to provide a hands-free telephone for automobiles.

(Means for solving the problem) According to the present invention, in order to achieve the above-mentioned purpose,
Switch to handset or hands-free calls by facing the driver and picking up the microphone placed near the air outlet of the air conditioner and the transmitter/receiver of the handset telephone, or by operating a designated switch on the control panel. a telephone control circuit electrically connected to a blower motor control circuit of the air conditioner;
The air volume control means outputs a blower control signal, and the air volume control means outputs the blower control signal when the blower is operating and the hands-free call switching control is executed by the telephone control circuit. is output to reduce the air volume of the blower to a predetermined low air volume value, and when the hands-free call is switched to a handset call, the air volume of the blower is returned to the air volume value before the start of the hands-free call. A hands-free automotive telephone set is provided.

(Function) The air volume control means of the telephone control circuit of the hands-free telephone for automobiles of the present invention outputs a blower control signal to the blower motor control circuit only during hands-free calls to switch the air volume of the blower to a low air volume value.
Reduce noise caused by blower operation.

(Example) An example of the present invention will be described below with reference to the drawings.

First, the configuration of a car telephone will be explained with reference to FIGS. 1 to 5. Reference numeral 10 denotes a conventionally known handset telephone for transmitting and receiving calls using a handset (H/S) 11. This telephone 10 is mounted, for example, on an armrest 13 provided in the center of the rear seat 12.
It is stored inside (Figure 4). This phone 10
is connected to a radio device 18 stored in a trunk room or the like via a changeover switch 16 of a hands-free adapter (hereinafter simply referred to as "adapter") 15 as a telephone control circuit. Telephone 10 communicates with a land-based subscriber station or other mobile phone subscriber station via antenna 18a of radio 18.

As will be described in detail later, the adapter 15 has functions such as switching control from the handset telephone 10 to a hands-free telephone consisting of a speaker 20 and a microphone 22, and has a central processing unit (CPU) 24,
It is composed of an H/F board 26, a steering wheel remote control IC 28, and a voice synthesis IC 30. The speaker 2
0 is console box 4 installed in the center of the front seat
The H/
It is electrically connected to the output terminal 26a of the F board 26. Two microphones 22 are provided on the instrument panel 41 in front of the driver's seat, with two microphones 22 protruding from both sides of the steering wheel 32 toward the driver's seat. ) are open (Fig. 2). and,
The microphone 22 is electrically connected to the input terminal 26b of the H/F board 26, and is connected to the input terminal 26b of the H/F board 26.
The terminal 26c of No. 6 is connected to the changeover switch 16.

A steering wheel remote controller 33 is attached to the support part (spoke) of the steering wheel 32, and the steering wheel remote controller 33 is connected to an electrical/optical converter attached near the upper end of the steering column (not shown) and the steering wheel remote controller IC 28.
An optical-to-electrical converter (photosensor) 34 is electrically connected to the input side of the handlebar remote control IC 28 through an optical connection using a known method. Various command signals generated by operating the switch group (FIG. 6) to be described later on the steering wheel remote controller 33 are transmitted to the steering wheel remote controller via the optical sensor 34, etc.
Supplied to IC28. Handle remote control IC28
An electronic tuning radio 36 mounted on the center console 42 is connected to the output side of the . Two speakers 36a of this radio 36 are attached to both ends of the dart board in front of the front seat. The steering wheel remote control IC 28 includes a code conversion circuit for the various command signals described above, a switching circuit for directly connecting the steering wheel remote controller 33 and the radio 36, and the like.

Reference numeral 38 denotes a display device attached to the overhead console 43, including a dial lock lamp 38a that displays a dial lock, and an out-of-range indicator that lights up when the mobile station, a car, moves out of the radio range where communication with the ground station is impossible. The display device 38 is composed of a lamp 38b and a 7-segment liquid crystal display panel 38c for identifying the dialed partner station, and is connected to the CPU 24 via a bus cable 19a. Furthermore, the CPU 24 includes the aforementioned steering wheel remote control IC 28, voice synthesis IC 30, and H/F board 26.
and radio device 18 and bus cables 19b, 19, respectively.
c, 19d, and 19e. Note that the display device 38 may be attached to the upper center of the front window or the instrument panel 41 instead of the overhead console.

Reference numeral 60 drives an air conditioner blower (not shown). For example, the blower motor 60 is a shunt-wound motor, and the blower motor 60 is connected to a power supply +V via a blower resistor 62, a switching relay 64, a blower switch 66, a fuse 68, and an ignition switch 69. Below the steering wheel 32 and on the side of the steering wheel 32 from the instrument panel 41, a so-called wing column 31 that extends horizontally in the radial direction on both sides of the steering column protrudes from the steering column, and the blower switch 66 is connected to this wing. Column 3
1, and consists of a common contact member 66a on the power supply side, three fixed contacts 66b, 66c, 66d on the blower motor 60 side, and a sliding contact member 66e.
can be turned off (OFF), low (Lo),
It can be switched to the middle (M) and high (Hi) positions by sliding, and when switched to the low (Lo), middle (M), and high (Hi) positions, the common contact member 66a and the fixed contacts 66b, 66c, and 66d are electrically connected to each other. The fixed contact 66b in the low (Lo) position is connected to the blower motor 60 via the connection point J1 and resistors R1 and R2 connected in series of the blower resistor 62.
The fixed contact 66c at the middle (M) position is connected to the movable contact 64a of the switching relay 64, and the fixed contact 66d at the high (Hi) position is connected to the movable contact 64b. Movable contacts 64a and 64b are CPU
The movable contact 64a operates in conjunction with the energization (on) and deenergization (off) of the relay coil 64g connected to the terminal 24. When the relay coil 64g is turned off, the movable contact 64a
is switched to the normal position where it is connected to the contact 64c, and the movable contact 64b is connected to the contact 64f.
4c are the resistors R1 and R2 of the blower resistor 62;
The contact 64f is connected to the connection point J2 between the resistor R2 and the blower motor 60, and the contact 64f is connected to the connection point _J3 between the resistor R2 and the blower motor 60, respectively.
On the other hand, when the relay coil 64g is turned on, the movable contact 64a is connected to the contact 64d, the movable contact 64b is connected to the contact 64e, and the contacts 64d and 64e are connected to each other.
are both connected to the connection point J1.

The sliding contact member 66e of the blower switch 66 is switched to the high (Hi) position, and the switching relay 64 is switched to the high (Hi) position.
When the relay coil 64g of the ignition switch 6 is in the off state, the power supply +v is closed.
9, the blower motor 60 rotates at a rotation speed substantially corresponding to the power supply voltage +v, and at this time, the blower discharges the maximum air volume from the air outlets 23, 23'. .
The sliding contact member 66e is in the middle (M) position and low (Lo)
When switched to the respective positions, the power supply +v is supplied through the resistor R2 and the resistor R1+R2 of the blower resistor 62, respectively, and therefore the voltage applied to the blower motor 60 is high in the middle (M) position. Since the low (Lo) position is lower than that at the (Hi) position, the rotation speed of the blower motor 60, that is, the blower air volume also decreases to the medium and low air volumes accordingly. become.

Next, the sliding contact member 66 of the blower switch 66
When e is switched to either the high (Hi) position or the middle (M) position and the blower is discharging the maximum or medium air volume, the relay coil 64g is activated by the blower control signal from the CPU 24, which will be described later. When energized (turned on), the movable contacts 64a and 64b are switched to contacts 64d and 64e, respectively, so that in either case, the power +v is applied to the blower motor 60 via the resistors R1+R2 of the blower resistor 62. This has the same effect as switching the sliding contact member 66e to the low (Lo) position,
The rotational speed of the blower motor 60, ie, the blower air volume, is forcibly reduced to a low air volume value.

FIG. 6 shows a group of switches of the handle remote control 33, these switches are push button type switches, hereinafter referred to as "keys".

First, the "AUDIO/PHONE" key 50 is used to select whether the switches on the handle remote controller 33 are used to control the operation of the radio 36 or the telephone, and each time the key 50 is pressed, the operation control mode is switched alternately. Change. When the telephone control mode (PHONE mode) is switched, the liquid crystal display board 38c of the display device 38 lights up, so that the selected mode can be confirmed by whether or not the liquid crystal display board 38c is lit. Furthermore, when the key 50 is switched to the radio control mode (AUDIO mode), the CPU 24 is activated by the handle remote controller 3.
The switching circuit of the steering wheel remote controller IC 28 is switched so that the command signal from the controller 3 is directly supplied to the radio 36, thereby executing radio control (AUDIO control).

The "POWER" key 51 is the "AUDIO/
When the PHONE key 50 is switched to AUDIO mode, it functions as a power on/off switch for the radio 36. Note that the power supply on the telephone side is turned on and off by an on/off switch (not shown) provided on the handset 11, but is normally kept in the on state at all times.

Each time the "VOL+/UP" key 52 is pressed
In the AUDIO mode, it functions as a switch that increases the radio volume by a predetermined amount, and in the PHONE mode, it functions as a switch that increments the speed dial of the called station by one. The speed dial of the called party station is displayed on the liquid crystal display board 38c of the display device 38.

The "VOL-/DOWN" key 53 is the opposite of the key 52, in the AUDIO mode it is a switch that reduces the volume by a predetermined amount, and in the PHONE mode it is a switch that decrements the speed dial of the called party by 1. function as respectively. Note that when the display board 38c is displaying the number 9, when this display is incremented by 1, the display is returned to 0. Further, when the number 0 is displayed, if this display is decremented by 1, the display becomes the number 9.

The "CHANGE/CALL" key 54 functions as a channel changeover switch for the radio 36 in the AUDIO mode, and switches to another station each time it is pressed. In the case of PHONE mode, press the above-mentioned "VOL+/UP" key 52 and "VOL-/
It has a function of generating a command signal to call the called party station using the abbreviated dial number of the called party station selected with the "DOWN" key 53, and when this command signal is supplied to the CPU 24, the CPU 24 sends a predetermined signal to the radio 18. The other party is called through the exchange.

The "AUTO M/CHECK" key 55 functions as an auto memory switch in AUDIO mode, and "VOL+/UP" in PHONE mode.
It has a function of generating a command signal to notify by voice the telephone number stored in correspondence with the speed dial number of the partner station selected by the key 52 and the "VOL-/DOWN" key 53, and this command number is supplied to the CPU 24, the CPU 24 reads out the telephone number of the calling party stored in correspondence with the selected speed dial number from the storage device of the CPU 24, and synthesizes a speech synthesis signal corresponding to the read number. Read from IC30 and send it to H/
When supplied to the F board 26, the speaker 20 outputs the stored telephone number corresponding to the selected speed dial number as a synthesized voice. This makes it possible to confirm whether the selected speed dial number corresponds to the correct telephone number of the destination station to which the user wishes to call.

The "FM/AM/END" key 56 functions as a radio AM/FM station selection switch in AUDIO mode, and as a call end switch in PHONE mode, and pressing this key 56 during a call turns off the phone. It is possible to put the end of the story (END) state.

Note that during a call using the handset (H/S) 11 (handset call), the handsfree (H/F)
If you want to switch to a telephone call (hands-free call), switch to PHONE mode using the "AUDIO/PHONE" key 50, press (turn on) the CALL key 54, and then the handset 11 switches to the telephone 10.
Press down on the switch to switch to hands-free calling. That is, the CPU 24 energizes the relay coil of the changeover switch 16 via the line 17, and connects the radio device 18 to the speaker 20 and microphone 22 via the H/F board 26. Conversely, if the handset 11 is picked up during a hands-free call, the call is switched to a handset call.

Next, refer to the flowcharts in FIGS. 7 to 11 for the procedure for controlling the blower air volume of the hands-free telephone and the air conditioner during a call according to the present invention, which is executed in the CPU 24 in response to a command signal from the handle remote controller 33. and explain.

First, to explain the case of making a call from a hands-free telephone, in step 101, the sixth
It is determined whether the PHONE mode has been switched to the PHONE mode using the PHONE key 50 shown in the figure. If the result of this determination is negative (No), the process advances to step 102, and control of the radio 38 (AUDIO control) is executed. Since the method of controlling the volume, channel selection, etc. of an electronically tuned radio is well known, a detailed explanation of the AUDIO control will be omitted.
When the AUDIO control is executed, step 101 is executed again. Therefore, by PHONE key 50
Step 102 until switching to PHONE mode
will be executed repeatedly. PHONE key 5
When switched to PHONE mode by 0,
A PHONE mode signal is supplied to the CPU 24,
The CPU 24 identifies that the mode has been switched to PHONE mode and stores this (step 105).

Next, proceed to step 120 in FIG. 8 via entry point B and press the AUDIO key 50.
Determine whether the mode has been switched to AUDIO mode. If the UP key 52 or DOWN key 53 is pressed (turned on) before switching to the AUDIO mode, the process advances to step 121. In step 121, the UP key 52 and SDOWN key 53 are used to select the speed dial number of the called party. Then, it is determined whether or not the AUDIO mode has been switched again by the AUDIO key 50, and if the CHECK key 55 is pressed (turned on) before switching to the AUDIO mode, the process proceeds to step 124. In step 124, the dialed number is confirmed using the method described above. That is, the phone number stored corresponding to the speed dial number selected in step 121 is transmitted to the speaker 2.
The notification is made using a voice synthesized from 0. still,
It is up to the telephone user to decide whether or not to turn on the CHECK key 55 to confirm the telephone number, so if confirmation of the telephone number is not necessary, skip steps 122 and 124 and proceed to step 125, and repeat the process at this step. It is determined whether or not the AUDIO mode has been switched by the AUDIO key 50. and,
CALL key 5 before switching to AUDIO mode
4 is turned on, the process proceeds to step 126, in which a selection (calling) signal based on the speed dial number selected in step 121 is transmitted to the other station via the exchange, and a blower control signal is supplied to the switching relay 64. Then, turn on relay coil 64g and switch the blower air volume to low Lo (step 127). Since the air volume of the blower is automatically reduced in this way, the driver does not have to manually reduce the air volume of the blower each time the telephone is used to make a call, and the S/N ratio of the call is improved.

Note that if the AUDIO key 50 is pressed (turned on) without executing each of the steps 121, 124, and 126, the process proceeds to step 106 in FIG. 7 via entry point C, and the CPU 24 is switched to the AUDIO mode. Remember this and proceed to step 107, which will be explained later.
After executing , the AUDIO control in step 102 is executed.

By executing step 126 in FIG. 8, the caller makes a call to the other station and waits until the other station responds (steps 130 to 133), but when the other station picks up the handset and answers, the call goes through entry point D. The process then proceeds to step 140 in FIG. 9, where a hands-free (H/F) call is started. On the other hand, if the other station does not respond, step 132 and 133
It is determined whether the END key 56 and the AUDIO key 50 are pressed (on), and if the END key 56 is pressed (on) (if the determination result in step 132 is affirmative (Yes)), the CPU 24 turns off the telephone. The call is terminated (turned off), that is, the connection between the telephone and the line is cut off (step 135), and the process returns to the entry point B. If the AUDIO key 50 is turned on without the END key 56 being pressed (the determination result at step 132 is negative (No)), the CPU 24 will It is assumed that the telephone has been hung up, and the process proceeds to step 134 via entry point E. After turning off the telephone in step 134, the process proceeds to step 106 via entry point C. and,
After remembering that the mode has been switched to the AUDIO mode in step 106, the air volume of the air conditioner's blower is restored to the state before the hands-free call (step 107), and then the process proceeds to step 102. That is, when the blower air volume is reduced to a low air volume value during a hands-free call, it is returned to the air volume value before the hands-free call.

Next, when a hands-free call is started in step 140 in FIG.
If both of the determination results are negative (No), and the handset 11 is picked up and the telephone 10
Unless the switch is turned on (the determination result in step 143 is negative), the process will proceed via entry point F and step 138, which will be described later.
Steps 140 to 143 are executed repeatedly.

When the telephone is hung up on the own side (if the determination result in step 141 is affirmative (Yes)), step 146 and
At each step 148, it is determined whether the END key 56 and the AUDIO key 50 are pressed (turned on), and if neither key is pressed, the process returns to step 140 via entry point F and step 138. , when the END key 56 is turned on (if the determination result in step 146 is affirmative (Yes))
Turn off the phone (step 147) and return to step 120 above via entry point B, END
If the key 56 is not turned on (the determination result in step 146 is negative (No)), but the AUDIO key 50 is turned on (the determination result in step 148 is affirmative (Yes)).
), the CPU 24 assumes that the telephone has been terminated and executes step 134 via entry point E, that is, turns off the telephone. Then, step 106 and further step 107 are executed to restore the airflow volume of the air conditioner's blower to the original airflow volume.

If the other party hangs up during a hands-free call (the determination result in step 142 is affirmative (Yes))
), the connection between the telephone and the line is broken and the telephone is placed in a call-end state, but the CPU 24 causes the speaker 20 to play a busy tone via the H/F board 26 (step 150). Then, it is determined whether either the END key 56 or the AUDIO key 50 is pressed (turned on) (steps 151 and 152), and if neither key is turned on, step 150 is executed continuously to turn the speaker 20 on. Play a busy tone. However, when the END key 56 is turned on (step 151
If the determination result is affirmative (Yes), the busy tone is stopped and the process returns to step B via entry point B.
Returning to step 120, if the END key 56 is not turned on (if the determination result in step 151 is negative (No)) and the AUDIO key 50 is turned on (if the determination result in step 152 is positive (Yes)), In this case as well, step 106 in FIG.
Furthermore, the process proceeds to step 107, where the air conditioner blower air volume is restored to the original air volume.

When the handset 11 is picked up during a hands-free call and the switch of the telephone 10 is turned on (the determination result in step 143 is affirmative (Yes))
), the CPU 24 returns the blower air volume of the air conditioner to the state before the hands-free call (step 144), and then proceeds to step 155. In step 145, the CPU 24 switches the changeover switch 16 to the handset side and turns off the handsfree side.
In other words, hands-free calls are prohibited (step
155), the process proceeds to step 160 in FIG. 10 via entry point G and starts a handset (H/S) call.

When a handset call is started, neither the local station nor the other party hangs up (the determination results in steps 161 and 162 are both negative (No)).
), and if the switching operation to hands-free communication is not performed (if the determination result in step 163 is negative), steps 160 to 163 are repeatedly executed to maintain the handset communication.

If the telephone is to be hung up at the local station (if the determination result in step 161 is affirmative), or if the telephone is to be hung up at the other party (if the determination result in step 162 is affirmative), the process proceeds to step 168. proceed, place the handset 11 on the telephone 10, turn off the switch, and then switch the CPU 24 to the AUDIO/
It is determined whether the PHONE key 50 has been switched to PHONE mode (step 169). If the answer is affirmative (Yes), proceed to step 120 in FIG. 8 via entry point B; if negative (No), proceed to step 101 in FIG. 7 via entry point A. .

If you want to switch to a hands-free call during a handset call (if the determination result in step 163 is affirmative), proceed to step 164, and the CPU 24
determines whether the AUDIO/PHONE key 50 has been switched to PHONE mode. If the result of this determination is negative (No), the system waits until the PHONE key 50 is turned on (the result of determination in step 165 is negative (No)).
Repeat steps 160 to 165. PHONE key 50
is turned on (if the determination result at step 165 is affirmative), the CPU 24 remembers that the mode has been switched to PHONE mode at step 166, and executes steps 160 to 164 again. step
At step 164, as a result of the PHONE key 50 being switched to the PHONE mode, the determination result becomes affirmative (Yes), and the process proceeds to step 170. In step 170
It is determined whether or not the CALL key 54 has been pressed (turned on), and if the CALL key 54 is not turned on, it waits until it is turned on, and steps 160 to 164 and 170 are performed.
Execute repeatedly. If the CALL key 54 is turned on (if the determination result in step 170 is affirmative), the process advances to step 172 and the handset (H/
S) 11 is placed on the telephone 10 to determine whether the switch is turned off. If the answer is negative (No), the handset call is held (step 173) and the telephone 10 of the handset 11 is
Steps 172 and 173 are repeated until the switch is turned off. When the handset 11 is placed (if the determination result in step 172 is affirmative), the process proceeds to step 138 in FIG. A free call will begin. That is, if you want to switch to a hands-free call during a handset call, press the AUDIO/PHONE key 50 on the handle remote control 33.
Hands-free calling is possible only after switching to the PHONE mode, turning on the CALL key 54, and turning off the switch on the telephone 10 of the handset 11. Since the blower air volume is reduced before starting the hands-free call, the S/N ratio can be improved.

Next, when a calling signal from another station arrives,
The CPU 24 connects to the speaker 2 via the H/F board 26.
0 to play a ringtone (steps in Figure 11)
175). The handset telephone 10 is stored in the armrest 13 in the center of the rear seat 12, and when receiving a call from another station using the telephone 10 of the handset 11, the armrest 13 is raised and placed in the seat back of the rear seat 12. If the ring tone is embedded in the armrest 13, the ring tone will be confined within the armrest 13, making it difficult for passengers to hear the ring tone, so the speaker 2
0 causes the ring tone to sound.

In response to an incoming call from another station, it is determined whether or not the hands-free (H/F) telephone should receive the call (step 176). If you do not receive the call using a hands-free telephone (if the determination result in step 176 is negative),
Proceed to step 184, pick up handset 11 and turn on the switch, proceed via entry point G to step 160 of FIG.
Start the aforementioned handset (H/S) call.

On the other hand, when responding to an incoming call from another station using the hands-free telephone (if the determination result in step 176 is affirmative), the CPU 24
It is determined whether the PHONE key 50 has been switched to PHONE mode (step 177). And, if this discrimination result is negative (No),
Wait until the PHONE key 50 is turned on (if the determination result in step 178 is negative);
Steps 176 to 178 are executed repeatedly. PHONE
When the key 50 is turned on (if the determination result at step 178 is affirmative), the CPU 24 memorizes that the mode has been switched to PHONE mode at step 179, and passes through entry point F to the 9th mode.
After executing step 138 in the figure and reducing the blower air volume of the air conditioner, the above-mentioned hands-free call is started (step 140). If the PHONE key 50 has already been turned on and switched to PHONE mode before receiving the call, proceed to step 182, and press the key again after receiving the call.
It is determined whether the PHONE key 50 has been pressed. If the answer is negative (No), the process waits until the PHONE key 50 is turned on, and steps 176 and
Repeat steps 177 and 182. And PHONE
When key 50 is turned on, step 138 of FIG. 9 is executed via entry point F;
Reduce blower air volume. In addition, PHONE key 50
has already been pressed once before the call arrives, and at this time the CPU
24 remembers that it has been switched to PHONE mode, so there is no need to remember that it has been switched to PHONE mode again. In this manner, when answering an incoming call from another station using a hands-free telephone, pressing the PHONE key 50 after receiving the call will result in an incoming call.

(Effects of the invention) As detailed above, according to the hands-free telephone for automobiles of the present invention, it is electrically connected to the motor control circuit of the blower of the air conditioner, the blower is operating, and the telephone is controlled. When the circuit executes hand-free call switching control, it outputs a blower control signal to reduce the blower air volume to a predetermined low air volume value, and when the hand-free call is switched to a handset call, the blower air volume decreases. Since the device is equipped with an air volume control means that returns the air volume to the air volume value before starting a hands-free phone call, the air conditioner blower air volume is automatically reduced when making a hands-free phone call, and the blower switch can be manually operated each time a call is made or received. Since there is no need to do this, the operability of the telephone is improved accordingly, and the S/N ratio during a call can be improved, which is an excellent effect.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the configuration of a hands-free telephone for automobiles according to the present invention, Fig. 2 is a layout diagram of the vicinity of the front dashboard in the vehicle interior, Fig. 3 is a perspective view of the center console, and Fig. 4 is Perspective view of the rear seat including a partial perspective view of the armrest, No. 5
The figure is an enlarged front view of the display device attached to the overhead console in Figure 2, Figure 6 is a layout diagram of the switch group of the steering wheel remote control installed on the support part of the steering wheel in Figure 2, and Figures 7 to 7. FIG. 11 is a flowchart for explaining the operation control procedure of the hands-free telephone. 10...Handset telephone, 11...Handset, 15...Hand-free adapter (telephone control circuit), 18...Radio device, 20...Speaker,
22... Microphone, 24... Central processing unit (CPU), 26... Hand-free (H/F) board, 28... Handle remote control IC, 30... Voice synthesis IC, 33... Handle remote control, 36...
...electronic tuning radio, 38...display device, 50...
AUDIO/PHONE key, 56...END key, 6
0...Blower motor, 62...Blower register,
64...Switching relay, 66...Blower switch.

Claims (1)

[Scope of utility model registration request] Switch to handset or hands-free calls by facing the driver and picking up the microphone placed near the air outlet of the air conditioner and the transmitter/receiver of the handset telephone, or by operating a designated switch on the control panel. The telephone control circuit is electrically connected to the motor control circuit of the blower of the air conditioner and includes air volume control means for outputting a blower control signal, and the air volume control means is When the blower is operating and the hands-free call switching control is executed by the telephone control circuit, the blower control signal is outputted to reduce the air volume of the blower to a predetermined low air volume value, while the hand-free call switching control is performed by the telephone control circuit. A hands-free telephone for an automobile, characterized in that when switching from a free call to a handset call, the air volume of a blower is returned to the air volume value before the start of a hands-free call.