JPH0631258U - Handsfree adapter for telephone - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a hands-free adapter for telephones with a simple configuration that enables hands-free calling. [Structure] By electromagnetically coupling a plug connected to an earphone / microphone connection terminal of a telephone, an external microphone connected to the microphone terminal of the plug, and a head portion of a cassette deck connected to the earphone terminal of the plug Hands-free adapter for telephones that consists of a cassette adapter that transmits signals.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hands-free adapter for a telephone, and more particularly to a hands-free adapter for a telephone that can be connected to a mobile phone or a car phone and a cassette deck such as a car stereo so that the voice of the other party can be heard from a stereo speaker. It is a thing.

[0002]

[Prior art]

 Conventionally, an earphone / microphone set has been used for a so-called hands-free call in which a telephone call, particularly a mobile phone or a car phone, is performed with a radio body or a handset left. This is the one in which the earphone and the microphone are connected to the connection plug.The user plugs this earphone / microphone set into the earphone / microphone jack of the telephone, puts the earphone in the ear, and fixes the external microphone to the collar etc. Was there.

[0003]

[Problems to be solved by the device]

 Since the earphone / microphone set as described above is configured to listen to the voice of the other party through the earphone, there is a problem that the earphone needs to be packed into the ear when receiving a call, or the earphone must always be worn. .

There is also a problem that a plurality of people cannot hear the voice of the other party at the same time.

An object of the present invention is to improve the above-mentioned problems of the prior art and to provide a handsfree adapter for a telephone which has a simple structure and enables handsfree communication.

[0006]

[Means for Solving the Problems]

 The telephone hands-free adapter of the present invention is connected to an earphone / microphone connection terminal of a mobile phone or a car phone, an external microphone connected to the microphone terminal of the plug, and an earphone terminal of the plug, It is composed of a cassette deck head unit and a cassette adapter that transmits signals by electromagnetically coupling.

[0007]

[Action]

 By such means, the voice of the other party can be heard from the speaker of the car stereo, so that if only the external microphone is attached, hands-free communication becomes possible, and more than one person can hear the other party's voice at the same time.

[0008]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external view showing the structure of a handsfree adapter for a telephone according to the present invention. The plug 1 is for connecting to an earphone / microphone jack equipped in a handset of a mobile phone or a car phone, and for inputting / outputting an audio signal from the outside. The cord 2 connects the plug 1, the cassette adapter 3, and the external microphone 4. The cassette adapter 3 is used to input signals from the outside to the car stereo 5 by inserting it into the cassette deck of the car stereo 5 like a normal cassette and electromagnetically coupling with the head of the cassette deck. Is.

The external microphone 4 is small and lightweight, and is used by being fixed to a collar or the like with a clip or the like. Also, use a unidirectional device as much as possible so as to prevent howling and surrounding noises and pick up only the user's voice. Reference numeral 5 is a car stereo, and 6 is an automobile telephone handset as an example of a telephone.

Next, the circuit configuration of the entire system of the present invention will be described. FIG. 2 is a block diagram showing a circuit configuration of the entire system including a hands-free adapter for a telephone, a car stereo, and a portable telephone as an example of a telephone. First, the mobile phone will be described. The duplexer 10 is for preventing the signal from the transmitter 18 from sneaking into the receiver 11. The receiver 11 receives a signal of a channel designated by a controller (not shown). The detector 12 converts the received signal into a baseband signal. The voice amplifier 13 amplifies the detected voice signal. 14 is a speaker and 15 is a microphone.

The low frequency amplifier 16 amplifies a voice signal input from the microphone 15 or the jack 19. The modulator 17 modulates a voice or a control signal by a predetermined modulation method such as FM. The transmission unit 18 frequency-converts the modulated signal into a signal of a channel designated by a control unit (not shown) and amplifies the signal. The jack 19 is a connector terminal for using an external microphone and an earphone. When the plug 1 is inserted into the jack 19, the audio amplifier 13 and the internal speaker 14, and the microphone 15 and the low-frequency amplifier 16 are disconnected and are connected to the terminals of the plug 1, respectively. These configurations are generally known.

Next, the configuration of the telephone hands-free adapter will be described. The plug 1 has three contacts on a cylindrical terminal portion, which are used as contacts for connecting an external microphone, connecting an external earphone, and a common ground. The signal line from the external microphone 4 is connected to the contact for external microphone connection and common ground connection, and the signal line of the cassette adapter 3 is connected to the contact for external earphone connection and common ground connection. .

Inside the cassette adapter 3, a coil 20 is arranged at a position facing the head when the cassette adapter 3 is inserted into the cassette deck portion. The sound signal is input to the car stereo by electromagnetically coupling. It is also possible to use a commercially available cassette adapter.

The car stereo head 21 is for reading out signals recorded on a cassette tape. The equalizer amplifiers 22 and 23 are for restoring the frequency characteristics of the reproduced signal, and the power amplifiers 24 and 25 amplify the power of the signal. Reference numerals 26 and 27 are speakers.

Next, the operation of the above embodiment will be described. The user attaches the external microphone 4 to the collar, inserts the plug 1 of the handsfree adapter for telephone into the earphone / microphone jack 19 of the mobile phone, and inserts the cassette adapter 3 into the cassette deck of the car stereo 5. Alternatively, perform the above operations when starting a call or during a call.

By doing so, the voice of the other party can be heard from the speaker of the car stereo, and a hands-free call can be performed. Furthermore, the volume can be adjusted freely, so that multiple people can listen to the other party's voice at the same time.

Although one embodiment has been described above, according to the present invention, an existing car stereo can be used without any modification, and a hands-free telephone call can be performed by simply adding a telephone hands-free adapter having a simple structure. Is possible. It can also be used at home if the phone has an earphone / microphone jack.

[0018]

[Effect of device]

 As described above, according to the present invention, by using a telephone handsfree adapter having a simple structure, it is possible to perform a handsfree call with good operability.

[Brief description of drawings]

FIG. 1 is an external view showing the structure of a handsfree adapter for a telephone according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the entire system.

[Explanation of symbols]

1 ... Plug, 2 ... Cord, 3 ... Cassette adapter, 4 ...
External microphone, 5 ... Car stereo, 6 ... Handset

Claims (1)

[Scope of utility model registration request] 1. A plug connected to an earphone / microphone connecting terminal of a telephone, an external microphone connected to the microphone terminal of the plug, and an earphone terminal of the plug, which are electromagnetically coupled to a head portion of a cassette deck. Hands-free adapter for telephones, which consists of a cassette adapter that transmits signals.