JPH1198234A - Adapter for portable telephone and microphone cable for adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter for a hands free portable telephone and a microphone cable for an adapter for which constitution can be made simple and moreover inexpensive, and an equipment space for extension is hardly necessary. SOLUTION: An adapter 300 for a portable telephone is provided with an adapter main body 302 mounted on a tape player 200, a handsfree microphone 304, a first cable 306 for connecting the adapter main body with a portable telephone 100, and a second cable 308 for connecting the handsfree microphone with the portable telephone. The adapter main body is provided with a housing part 300 whose outside shape is the same as that of a cassette tape, and a recording head arranged inside. A plug 310 to be inserted into a jack for inputting and outputting the voice of a portable telephone is provided at the other edge of the first and second cables. A received signal received by the portable telephone is reproduced via the adapter by the tape player and outputted from a loudspeaker. A transmitted signal from the handsfree microphone is inputted through the adapter to the portable telephone, and transmitted through the portable telephone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone adapter and a microphone for using a portable telephone in a hands-free manner by using an audio device having a reproducing device for reproducing audio information of a recording medium. About the cable.

[0002]

2. Description of the Related Art In recent years, traffic accidents caused by a driver of an automobile operating a telephone while driving have occurred frequently. For this reason, proposals have been made to use a telephone in a vehicle hands-free.

A proposal of this kind is disclosed in Japanese Patent Application Laid-Open No. 6-2528.
21, JP-A-7-143051, JP-A-8-4667
8, JP-A-8-125727, JP-A-8-24227
5 and JP-A-9-84131.

[0004] Among these, there are those which output received voice using a speaker connected to an on-vehicle audio device or the like which is usually equipped in an automobile.

In order to realize this, two types of systems have been proposed. One of them is to connect an in-vehicle audio device and a mobile phone by a wired connection via an in-vehicle adapter, as disclosed in Japanese Patent Application Laid-Open No. 8-46678. The other is a hands-free system that, as disclosed in Japanese Patent Application Laid-Open No. 9-84131, wirelessly receives an input voice from a microphone, inputs the voice to a mobile phone, and transmits a reception voice from the mobile phone wirelessly. Modules are provided. This hands-free module transmits received voice to a receiving device and outputs it from a speaker.

[0006] However, both of the above two methods require an in-vehicle adapter or a hands-free module having a complicated structure, so that the cost of the apparatus is increased and a space for additional equipment in the vehicle must be secured.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, to have a simple and inexpensive structure,
In addition, an object of the present invention is to provide a hands-free mobile phone adapter and a microphone cable for the adapter, which require almost no additional equipment space.

[0008]

According to a first aspect of the present invention, there is provided a reproducing apparatus for reproducing a first audio signal received by a portable telephone having an audio output terminal and an audio input terminal through the audio output terminal. And a second audio signal is input to the mobile phone from the audio input terminal,
A mobile phone adapter for transmitting the second audio signal via the mobile phone, wherein the adapter main body mounted on the playback device, a hands-free microphone, and the adapter main body and the mobile phone are connected. A first cable, a second cable having one end connected to the hands-free microphone and connecting the hands-free microphone to the mobile phone, wherein the adapter body is attached to the playback device; A housing portion having substantially the same outer shape as the outer shape of the audio recording medium; and a recording head disposed in the housing portion at a position in contact with a playback head of the playback device and connected to one end of the first cable. And a first terminal connected to the audio output terminal of the mobile phone is provided at the other end of the first cable, and the second cable At the other end, wherein the second terminal connected to the audio input terminal of the mobile phone is provided.

According to the first aspect of the invention, a hands-free call can be made as follows. First, before or after an incoming call to the mobile phone, the power of the playback device is turned on, the adapter body is attached to the playback device, and the recording head of the adapter body and the playback head of the playback device are brought into contact with each other. .
When an automatic incoming call is received by the automatic call receiving function of the mobile phone, the first voice signal, which is the voice of the other party, is recorded on the adapter body via the voice output terminal, the first terminal, and the first cable of the mobile phone. Sent to the head. The recording head is
The first audio signal is recorded in the reproducing head, and the reproducing head reproduces the signal, and the other party's call is output from a speaker connected to the reproducing device via a signal processing system of the reproducing device. On the other hand, the second
Is collected by a hands-free microphone,
, The second terminal, and the voice input terminal. In the mobile phone, the second voice signal is transmitted via the antenna, so that the mutual conversation is realized hands-free.

[0010] According to the first aspect of the present invention, a hands-free call can be made using an existing reproducing apparatus and a speaker, and the portable telephone is connected to the reproducing apparatus to be connected to the reproducing apparatus. Instead of the original recording medium, an adapter body having substantially the same outer shape as that of the recording medium may be inserted into the playback apparatus and mounted. Therefore, only the mobile phone, the hands-free microphone and the first and second cables are arranged outside the playback device to realize the hands-free call,
No additional space is required. Moreover, sound quality can be ensured by utilizing the functions of the existing playback device itself, and by adjusting the sound quality and volume of the playback device itself as necessary, a comfortable conversation can be realized even in a noisy space such as a car.

According to a second aspect of the present invention, in the first aspect, the audio output terminal and the audio input terminal of the mobile phone are configured as an audio input / output jack having a common ground, an audio output terminal, and an audio input terminal. The first and second terminals are formed by plugs inserted into the audio input / output jacks, and the first and second cables are connected to the plugs.

Since many mobile phones have a voice input / output jack, the connection between the adapter and the mobile phone can be realized more simply by inserting a plug into the jack. Moreover, since the first and second cables are commonly connected to one plug, the adapter body and the handsfree microphone can be integrated.

According to a third aspect of the present invention, in the first or second aspect, a band-pass filter that passes an audio frequency band of the first audio signal is disposed in the middle of the first cable. It is characterized by the following.

According to the third aspect of the present invention, when the first audio signal passes through the band-pass filter, for example, 2 to 8
Only the KHz audio frequency band is passed, and low-frequency and high-frequency unnecessary for conversation can be cut off to enable comfortable conversation.

According to a fourth aspect of the present invention, in the first or second aspect, a noise filter for preventing passage of noise radiated from the reproducing device is provided in the middle of the first cable. And

According to the fourth aspect of the present invention, the noise of the first audio signal is particularly likely to be superimposed on the first cable. For example, even if the radiated noise from the reproducing apparatus is superimposed on the first cable, the noise filter is not affected. Blocks its passage. Therefore, comfortable conversation is possible without necessarily requiring the band pass filter described in the third aspect.

According to a fifth aspect of the present invention, in the fourth aspect, the noise filter provided in the middle of the first cable comprises:
The adapter body is disposed inside the housing portion.

According to the fifth aspect of the present invention, since the noise filter is disposed at one end of the first cable and close to the end on the connection side with the adapter body, the noise filter superimposed on the first cable is provided. Can be effectively prevented from being propagated to the signal processing circuit system in the adapter body.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the reproducing head in the reproducing apparatus has a first dual head for reproducing a stereo signal, and is disposed in the housing. The recording head includes the first
The monaural first audio signal is recorded on at least one of the dual heads.

Since the reproducing apparatus is an audio apparatus, it has a dual head for stereo. However, since the first audio signal is monaural, the first audio signal is recorded on at least one of the heads so that the left and right sides are recorded. Alternatively, the conversation can be established by outputting the voice of the other party from both speakers.

According to a seventh aspect of the present invention, in the sixth aspect, the recording head has a second dual head that comes into contact with the first dual head in the reproducing device, and the housing portion and the hands-free device are provided. An operation unit is arranged on one of the microphones, and a switch that selectively connects and connects the first cable to one of the second dual heads in conjunction with an operation on the operation unit. It is characterized by having.

According to the seventh aspect of the present invention, it is possible to switch so that either one of the right and left speakers outputs a sound in conjunction with the operation of the operation unit. Particularly in the case of the inside of a car, in the case of a right-hand drive, the voice of the other party from the right speaker is likely to be collected from a hands-free microphone arranged near the driver's seat, and this may be transmitted to the other party. In such a case, by switching the operation unit to output only from the left speaker, such a situation can be reduced.

According to the invention of claim 8, a first audio signal received by a portable telephone having an audio input / output jack is transmitted from a speaker connected to a reproducing apparatus via the audio input / output jack. A mobile phone adapter for outputting the second audio signal from the audio input / output jack to the mobile phone, and transmitting the second audio signal via the mobile phone. An adapter microphone body for connecting the mobile phone and the adapter body, wherein the adapter body has substantially the same outer shape as an audio recording medium mounted on the playback device. A housing portion having an outer shape, a recording head disposed at a position in the housing portion that contacts a reproduction head of the reproduction device, and a first plug at one end; A relay cable for transmitting an audio signal to the recording head, wherein the microphone cable for the adapter is a hands-free microphone, a first cable for connecting the adapter body to the mobile phone, and one end of the cable. A second cable connected to the hands-free microphone and connecting the hands-free microphone to the mobile phone; the first cable has a relay jack at one end into which the first plug is inserted; The other end of each of the first and second cables is connected to a second plug inserted into the audio input / output jack of the mobile phone.

According to the eighth aspect of the invention, the mobile phone adapter is divided into an adapter body and an adapter microphone cable. The first plug of the adapter body is inserted into a first device to be reproduced by a reproducing device (for example, a cassette tape player).
Audio information from the second recording medium can be connected to a playback device by inserting the device into a signal output jack of a device that reproduces a second recording medium (for example, a compact disk, a mini disk, or the like) other than the recording medium (cassette tape). Output from the speaker. When used as an adapter for a mobile phone, the relay plug of the microphone cable for the adapter may be inserted into the first plug.
As a result, the utility value of the adapter main body as an adapter for a playback device other than a mobile phone adapter can be secured.

In other words, in addition to the adapter main body sold as an adapter for another type of reproducing apparatus, a single microphone cable for the adapter defined in the invention of claim 9 is additionally provided, so that the conventional portable telephone cannot be realized. The value of use as a telephone adapter can be ensured, and there is high commercial value even with a microphone cable for the adapter alone.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

(Overall Configuration of Hands-Free Communication System)
FIG. 1 is a schematic perspective view of a hands-free communication system capable of talking on the telephone without using a hand inside a car.

In FIG. 1, this system is roughly divided into
The mobile phone 100 includes a mobile phone 100, an in-vehicle audio device such as a tape player 200 mounted on an automobile, and a mobile phone adapter 300.

The portable telephone 100 has, for example, a three-terminal audio input / output jack 102 having an audio output terminal, an audio input terminal, and a common ground terminal.

The tape player 200 has a cassette slot 202 covered with a dust cover that can be opened and closed.

The mobile phone adapter 300 includes an adapter body 302 inserted from the cassette slot 102 and mounted on the cassette deck of the tape player 200, a hands-free microphone 304, and a first cable 306 pulled out from the adapter body 302. , A second cable 308 connected to the hands-free microphone 304, and a plug 310 connected to ends of the first and second cables and connected to the audio input / output jack 102 of the mobile phone 100. .

(Electrical Circuit Configuration of Hands-Free Communication System) FIG. 2 is a block diagram schematically showing an electric circuit system of the present system. In FIG. 2, mobile phone 100 receives a reception signal (first audio signal) via antenna 110 and transmits a transmission signal (second audio signal).
The switch 112 is a switch for switching between transmission and reception of the first and second signals. The first audio signal is supplied to the first amplifier 11 via the antenna 110 and the switch 112.
4 and amplified. On the other hand, the second audio signal input from the hands-free microphone 304 is transmitted to the second cable 308, the plug 310, and the audio input / output jack 10.
2 to the mobile phone 100. This second audio signal is transmitted through the switch 112 and the antenna 110 after being amplified by the amplifier 116.

The first audio signal output from the mobile phone 100 via the audio input / output jack 102 is a plug 3
10 and the adapter body 3 via the second cable 306.
02. As shown in FIG. 2, a recording head 320 and a bandpass filter 322 are provided in the adapter main body 302. As the first audio signal passes through the band-pass filter 322, only a signal in the audio frequency band of 2 to 8 KHz is passed, and lower and higher frequency noises are cut off. As a result, low-range wind noises and the like during traveling transmitted from the other party's telephone are cut, and high-frequency sounds that make it difficult to hear conversation are also cut.

FIG. 5A shows a band-pass filter 322.
An example is shown. In FIG. 5A, a first cable 306 includes a first audio signal line 306a and a ground line 306b. The first cable 306 can be formed by a two-core cable in which the ground wire 306b is a net shield surrounding the first audio signal line 306a. In addition, similarly, the second cable 308
It can be formed by a two-core cable having a ground wire and a second audio signal line. Each ground wire in the first and second cables 306 and 308 is connected to a common ground terminal of the plug 310.

The bandpass filter 322 is most simply composed of a resistor R connected in series on the first audio signal line 306a and a capacitor C connected in parallel between the first audio signal cable 306a and the ground line 306b. And coil L
It is composed of

As shown in FIG. 5A, in the present embodiment, stereo-compatible dual heads 320R and 320L are used as the recording head 320. Since the first audio signal is monaural, it is sufficient to supply the first audio signal only to the head of one of the L and R channels. In this embodiment, the same first audio signal is supplied to both the L and R channels. Supplying to the head.

As shown in FIG. 3, the recording head 320 provided in the adapter
When the tape 2 is loaded on the tape deck of the tape player 200, it is arranged at a position where it contacts the reproducing head 210 of the tape deck. Therefore, the recording head 3
20 records the first audio signal to the reproducing head 210 in the tape player 200.

In the tape player 200, the first audio signal is reproduced by the reproducing head 210 and the third amplifier 2 is reproduced.
Amplify by 12. The amplified first audio signal is connected to the tape player 200 and output from left and right speakers 220a and 220b mounted on the automobile. In FIG. 2, only the amplifier 212 is shown as a signal processing system at the subsequent stage of the reproducing head 210.
Actually, the signal is output to the speaker via all the signal processing systems of the in-vehicle audio device.

(Explanation of Hands-Free Talking Method) The hands-free talking method is a talking method in which an incoming call at any time during driving is handled without using a hand. Two methods are known. One of them is a method of setting an automatic incoming call mode. For this, the specified number of telephone calls is set in advance, and when the specified number is exceeded, the mobile phone 100 automatically receives a call. The other one is
It is a method of using the function of "any key answer",
In this method, the mobile phone 100 automatically receives an incoming call simply by touching any key other than the power / disconnect key.

In order to end the communication, most mobile phones 100 have a function to automatically end the communication, for example, 2 to 6 seconds after the other party ends the call, and this function may be used.

According to the present embodiment, after receiving a call and after receiving the call, the user speaks his / her own conversation through hands-free microphone 304 without grasping mobile phone 100 at all, and speaks the other party's conversation with speakers 220a and 220a provided in the vehicle. Since the user can listen to the sound from the terminal 220b, hands-free conversation becomes possible.

(Structure of Adapter Body) The adapter body 302 itself has the same structure as the cassette adapter disclosed in, for example, Japanese Patent Application Laid-Open No. 62-120688. The adapter body 302 is, as shown in FIGS.
It has a housing part 330 made of, for example, plastic having substantially the same outer shape as that of the cassette tape. For this reason, the housing part 330 is more
Through the reel housing opening 332, as shown in FIG.
334, capstan housing openings 336 and 338, and guide pin housing openings 340 and 342, respectively. Also,
On the front face of the recording head 320, as shown in FIG.
Head opening 344 and two pinch roller accommodation openings 3
46 and 348 are formed. FIG. 3 shows a state where one pinch roller 230 is accommodated in one pinch roller housing opening. In the case of the auto-reverse type tape player, the pinch rollers are accommodated in the two pinch roller accommodation openings 346 and 348 at the time of the forward rotation drive and the time of the reverse drive, respectively.

Further, as shown in FIG. 1, the housing portion 330 has a structure different from that of a general cassette tape, and has two side surfaces 330d and 330e from the back surface 330c.
To connect the first cable 306 to the adapter body 302.
It has a slit 350 for drawing out more. When the tape player 200 is a front-loading type as shown in FIG. 1, it is sufficient to form the slit 350 only on the rear surface 330c of the housing portion 330 which is the rear end of the adapter body 302. On the other hand, unlike FIG. 1, when a side loading type tape player is used, it is necessary to pull out the first cable 306 from one of the side surfaces 330d and 330e, which is the trailing end. In the present embodiment, the rear surface 33 of the housing part 330 is used so that it can be used for any loading type.
Slit 3 from 0c to both sides 330d, 330e
50 are provided.

Further, it is preferable that the adapter body 302 be provided with measures for preventing an automatic reversal operation when used in an auto-reverse type tape recorder.
For this purpose, as shown in FIG.
2, two reels 362, 364 having hubs 362a, 364a projecting from the inner periphery thereof are rotatably supported,
A belt 368 is stretched around the outer circumferences of the two reels 362 and 364.

In this case, the two hubs 362a, 364
When the rotational force from the reel shaft is transmitted to one of the two reels a and one of the two reels 362 and 364 is driven to rotate, the other reel continues to rotate via the belt 368. As a result, when the reel on the sending side stops rotating, the automatic reversing device that detects the reversal timing does not operate.

(Description of Modification of Adapter Body) FIG. 5
(B) and FIG. 6 show a modification of the adapter body. FIG.
As shown in (B), the first audio signal after passing through the band-pass filter 322 is divided into dual heads 322R and 322.
A switch 380 for selectively switching and transmitting only one of the L heads can be provided. By switching the recording head between L and R, the speaker from which the conversation from the other party is output can be switched between L and R.

The switch 380 may be electrically switched by a signal based on an input to an operation unit provided in the microphone 304 or the like, but may be mechanically performed as shown in FIG. In FIG. 6, the adapter body 30
A cutout 370 is formed in a part of the second housing 330, and an operation section 372 operable in the direction of the arrow in the drawing is provided within the cutout 370. The switch 380 can be switched in conjunction with the operation unit 372.

As described above, the advantage of switching the speaker from which the conversation from the other party is output between L and R is as follows. That is, the hands-free microphone 304 is arranged on the side close to the driver's seat, and on the right side in the traveling direction in the case of a Japanese car, the conversation of the other party from the right speaker can be easily collected.
Then, the conversation of the other party is transmitted to the other party via the hands-free microphone 304.

Therefore, in the case of a Japanese car, it is preferable to use only the left speaker. Here, the first audio signal line 306a in FIG.
Even when only the 20L is connected, the right speaker is used by turning the adapter body 302 upside down and mounting it on the tape deck. Therefore, in this case, it is necessary to force the user to always insert the adapter body 302 in a fixed direction. For this reason, if the configuration is such that the operating speaker can be switched by the operation unit 372, the user can easily understand the speaker switching operation. This makes it easy to use the right speaker in the case of an outside vehicle with a left handle.

When the first audio signal is input to both channels as shown in FIG. 5A as a countermeasure against the above-described speaker selection, one of the speaker outputs is output to the in-vehicle audio equipment. It is also possible to operate the balance volume provided in the squeezing operation to squeeze.

(Description of Modification of Hands-Free Communication System) FIG. 7 shows a modification of the hands-free communication system. The differences from the embodiment of FIG. 1 are as follows. First, the relay cable 402 is pulled out from the adapter body 400 shown in FIG.
Is connected. Therefore, the adapter body 400 is
With the cable 306 of FIG. In the embodiment shown in FIG.
0 is provided separately. This adapter cable 500
Are the first and second cables 306 and 308 connected to the second plug 310, and the relay jack 50 connected to the other end of the first cable 306 and detachable from the plug 404.
2 and a hands-free microphone 304 connected to the other end of the second cable 308.

Therefore, in the embodiment shown in FIG. 7, the adapter for the portable telephone is divided into the adapter main body 400 and the adapter cable 500. In this case, the adapter body 400
Can be used not only for a mobile phone adapter but also as an adapter for a device that reproduces a recording medium other than a recording medium that can be reproduced by an in-vehicle audio device. For example, when the in-vehicle audio device is a cassette tape player or the like, a CD (compact disk) player, an MD
By inserting the plug of the adapter main body 400 into the output jack of the (mini-disc) player, it becomes possible to reproduce a CD or MD instead of a cassette tape.

Adapter body 40 used in the embodiment of FIG.
0 preferably incorporates the circuit configuration shown in FIG. This configuration is disclosed in Japanese Patent Application Laid-Open No. 62-120688. An RC circuit is provided for each channel as a frequency characteristic balance circuit for the L and R channel signals.

The plug 404 of the adapter body 400
The jack 404 of the microphone cable 500 for the adapter
When hands-free calling is realized by connecting
The first audio signal may be supplied to one or both of the L-side signal line 306a and the R-side signal line 306C of (C). At this time, sounds of frequencies other than the effective band of the conversation are also output from the speaker, but when the in-vehicle audio device has, for example, an equalizer amplifier or the like, low and high frequencies can be cut.

The circuit configuration shown in FIG. 5C can be similarly applied to the hands-free communication system shown in FIG. 5 (A) and the high-cut filter shown in FIG. 5 (C). The audio signal is passed through the band-pass filter shown in FIG. 5 (A), and the audio signal is passed through the band-pass filter. A switch for switching the signal processing system depending on the type of signal may be provided so that the signal passes through the high-cut filter.

(Modification of Electric Circuit Configuration of Hands-Free Communication System) FIG. 8 shows the mobile phone adapter 3 shown in FIG.
FIG. 9 shows a modification of the adapter 300 shown in FIG.
1 shows an electric circuit configuration of a hands-free communication system using the communication system.

8 differs from FIG. 1 in that first cable 306 connecting adapter body 302 and plug 310 has first noise filter 600.

The first cable 306 is a two-core cable in which a signal line 306a is surrounded by an earth line 306b formed by a net shield as shown in FIG. In the present embodiment, a part of the first cable 306 is bent by a plurality of turns, for example, three turns, and a thermoplastic resin tube 602 is attached so that the bent state can be maintained.
Is composed. By doing so, an air-core coil is formed at a part of the first cable 306, thereby securing a filter function.

A second noise filter 610 provided in series with the first noise filter 600 is provided, for example, inside the adapter body 302 as shown in FIG. As shown in FIG. 9, the second noise filter 610 includes, for example, a toroidal core 612 made of ferrite.
In addition, the first cable 306 is wound a plurality of times.

Here, the resistors R1 and R2 and the capacitors C1 and C2 shown in FIG. 9 constitute the frequency characteristic balance circuit of FIG. 5C, and are mounted on a circuit board 620.

According to the circuit configuration shown in FIG. 9, even if noise is superimposed on the first cable functioning as an antenna, the passage is prevented by the presence of the first and second noise filters 600 and 610. The mobile phone 100
Is prevented from being superimposed on the voice of the call using.

In particular, as this kind of noise, the in-vehicle audio device 20 shown in FIG.
The radiation noise from 0 is a problem, but the adapter body 30
The noise superimposed on the first cable 306 is reduced by both the first noise filter 600 provided in the middle of the first cable extracted from the second cable 2 and the second noise filter 610 arranged in the adapter body 302. Can prevent passage. Note that, in order for the first noise filter 600 to operate effectively, the first
It is preferable to provide the filter 600 of FIG. In addition, the present invention is not limited to providing both the first and first noise filters 600 and 610, and may be provided only on one of the inside and outside of the adapter main body 302. Also in this case, the adapter body 30
It is preferable to provide a noise filter close to the circuit board 620 in 2. Further, the configuration example of the noise filter provided in the middle of the first cable is not limited to those shown in FIGS. 8 and 9, and various other forms can be used. This noise filter may be formed on the circuit board 620 shown in FIG.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, when there is no audio input / output jack in the mobile phone 100, an adapter having a jack compatible with the plug of FIG. 1 can be attached to the mobile phone 100, for example. In the case where the audio output terminal and the audio input terminal are separately provided in the mobile phone, the plug 310 in FIG.

Further, in the above-described embodiment, the hands-free communication system is configured by using the on-vehicle audio device, but it goes without saying that the hands-free communication system may be configured by using the home audio device. No.

[0065]

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a hands-free communication system.

FIG. 2 is a block diagram showing an electric circuit system of the system shown in FIG.

FIG. 3 is a schematic plan view schematically showing a state in which the adapter main body shown in FIG. 1 is set in a vehicle-mounted audio device.

FIG. 4 is a front view of the adapter main body shown in FIG. 1;

FIGS. 5A to 5C are circuit diagrams showing a circuit configuration inside the adapter main body.

FIG. 6 is a schematic explanatory view for explaining a modified example in which a speaker switching operation unit is provided on an adapter body.

FIG. 7 is a schematic perspective view showing a modification of the hands-free communication system.

FIG. 8 is a schematic explanatory view showing a modified example of the mobile phone adapter shown in FIG. 1;

FIG. 9 is a circuit diagram showing a modification of the electric circuit of the hands-free communication system configured using the mobile phone adapter shown in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 mobile phone 102 audio input / output jack 110 antenna 112 switch 114, 116 amplifier 200 in-vehicle audio device (cassette player) 202 cassette slot 210 playback head 212 amplifier 220a, 220b speaker 230 pinch roller 300 mobile phone adapter 302 adapter body 304 Hands-free microphone 306 First cable 306a Signal line 306b Ground line 308 Second cable 310 Plug (second plug) 320 Recording head 322 Bandpass filter 330 Housing unit 332, 334 Reel receiving opening 336, 338 Capstan receiving opening 340, 342 Guide pin receiving opening 344 Head opening 346, 348 Pinch roller receiving opening 350 Slit 362, 364 362a, 364a Hub 368 Belt 370 Notch 372 Operation section 380 Switch 400 Adapter body 402 Relay cable 404 First plug 500 Adapter microphone cable 502 Relay jack 600 First noise filter 602 Thermoplastic resin tube 610 Second noise filter 612 Toroidal core 620 Circuit board

Claims (9)

[Claims] A first audio signal received by a mobile phone having an audio output terminal and an audio input terminal is output from a speaker connected to a playback device via the audio output terminal, and A mobile phone adapter for inputting a second audio signal from the input terminal to the mobile phone and transmitting the second audio signal via the mobile phone; and an adapter body attached to the playback device; A hands-free microphone, a first cable connecting the adapter body to the mobile phone, a second cable connected to the hands-free microphone at one end, and connecting the hands-free microphone to the mobile phone, Wherein the adapter body has a housing portion having substantially the same outer shape as an outer shape of an audio recording medium to be mounted on the playback device; A recording head disposed at a position in contact with a reproduction head of the reproduction device, and one end of the first cable connected thereto; and the other end of the first cable includes the audio of the mobile phone. A first terminal connected to an output terminal is provided, and a second terminal connected to the audio input terminal of the mobile phone is provided at the other end of the second cable. Mobile phone adapter. 2. The audio output terminal and the audio input terminal of the mobile phone according to claim 1, wherein the audio output terminal and the audio input terminal are configured as an audio input / output jack having a common ground, an audio output terminal, and an audio input terminal. The second terminal is formed by a plug inserted into the audio input / output jack, and the first and second cables are connected to the plug. 3. The band according to claim 1, wherein a band-pass filter that passes an audio frequency band of the first audio signal is disposed in the middle of the first cable. Adapter for mobile phones. 4. The mobile phone according to claim 1, wherein a noise filter for preventing passage of noise superimposed on the first cable is provided in the middle of the first cable. Adapter. 5. The mobile phone adapter according to claim 4, wherein the noise filter provided in the middle of the first cable is disposed inside the housing portion of the adapter body. 6. The reproducing head according to claim 1, wherein the reproducing head in the reproducing device has a first dual head that reproduces a stereo signal, and the recording head disposed in the housing is: A mobile phone adapter, wherein the monaural first audio signal is recorded on at least one of the first dual heads. 7. The recording head according to claim 6, wherein the recording head has a second dual head in contact with the first dual head in the playback device, and one of the housing unit and the hands-free microphone. An operation unit is disposed, and a switch is provided for selectively switching and connecting the first cable to one of the second dual heads in conjunction with an operation on the operation unit. Mobile phone adapter. 8. A first audio signal received by a mobile phone having an audio input / output jack is output from a speaker connected to a playback device via the audio input / output jack. A mobile phone adapter for inputting a second audio signal from the input / output jack to the mobile phone and transmitting the second audio signal via the mobile phone, the adapter body being attached to the playback device And a microphone cable for an adapter for connecting the mobile phone and the adapter body, wherein the adapter body has a housing part having substantially the same outer shape as an outer shape of an audio recording medium mounted on the playback device. A recording head disposed in the housing portion at a position in contact with a reproduction head of the reproduction device; and a first plug at one end. A relay cable for transmitting to the recording head, wherein the microphone cable for the adapter includes a hands-free microphone, a first cable for connecting the adapter body to the mobile phone, and a hands-free microphone at one end. A second cable connected between the hands-free microphone and the mobile phone, the first cable having a relay jack at one end into which the first plug is inserted, and 1. A mobile phone adapter, wherein a second plug inserted into the audio input / output jack of the mobile phone is connected to the other end of the second cable. 9. A first cable having the relay jack according to claim 8 at one end, and a second cable having the hands-free microphone according to claim 8 at one end. A microphone cable for an adapter, wherein the second plug according to claim 8 is connected to the other end of the second cable.