JPH09162961A - Cordless speech system utilizing infrared ray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the cordless speech system with excellent operability by configuring the system with a transducer system consisting of a bone conduction microphone and a speaker and with a transmission/reception circuit unit consisting of an infrared ray emitting and receiving elements. SOLUTION: A voice of a talker is picked up by a bone conduction microphone of a transducer 2 and given to a transmission circuit of a transmission/ reception circuit unit 7. The voice is modulated in the transmission circuit of the transmission/reception circuit unit 7 as an FM wave of, e.g. 2.3MHz, the modulated signal is emitted from a light emitting element and sent to a 2nd light receiving element unit fitted to a sun-visor in a vehicle A voice from a transmission side is sent from a 2nd light emitting element unit as an FM wave of, e.g. 2.8MHz, a light receiving element of a 1st light receiving element unit 4 receives and demodulates the FM wave and sends the resulting signal to the transducer 2. A speaker of the transducer 2 provides vibration to the skull of the talker. Thus, the cordless speech system is realized, which is used with safety and provides excellent operability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless call system using infrared rays, and more particularly to a cordless call system using infrared rays which can be safely used in a vehicle without using both hands. It is a thing.

[0002]

2. Description of the Related Art When a telephone is used in a car, it may be inconvenient for a passenger to hear the contents of the call.
If a headphone or the like with a microphone and a speaker attached to the head is used, the above inconvenience will be eliminated, but the code will hang from the head, which will be an obstacle. Therefore, it can be considered to use a cordless dress.

As a cordless method, a method of using high frequency radio waves is generally used, but interference is likely to occur due to limitations on usable frequency, electric power and the like. That is, the current radio wave usage situation is extremely crowded, and it is easy for external unwanted radio waves to be received or conversely leaked to the outside. There is also a method of using infrared rays instead of radio waves, but this method has a drawback that it is vulnerable to direct sunlight, and if there is an obstacle that blocks light on the way, it will be cut off. Since earphones and headphones block the ears, there is a problem in terms of safe driving,
Since one-handed driving is unavoidable for mobile phones, there are still major problems in terms of safe driving.

[0004]

As described above, since there are problems in each of the conventional communication systems used in various automobiles, the present invention has good operability and infrared rays that can be safely used in automobiles. It is an object of the present invention to provide a cordless call system using the.

[0005]

According to the present invention, there is provided a transducer having a bone conduction microphone and a speaker, which is held in a crimped state near the ear of the head, and an infrared ray receiving element. A first light receiving and emitting element unit, which is provided with a light emitting element and is installed at an arbitrary position on the head, a transceiver circuit unit connected to the transducer and the first light receiving and emitting element unit, and is installed in a vehicle The first connected to a telephone
A cordless communication system using infrared rays, which comprises a second light emitting / receiving element unit corresponding to the light emitting / receiving element unit,
Has solved the above-mentioned problem. A plurality of the first light emitting / receiving element units and / or the second light emitting / receiving element units may be arranged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an example of a usage state of the system according to the present invention in which a mobile phone is being used while being charged in a vehicle. In the figure, reference numeral 1 denotes a substantially C-shaped elastic band made of metal, plastic or the like, which can be worn from both sides of the head to the top of the head. A bone conduction type transducer-2 is attached to the inside of one lower end of the band 1, and the elasticity of the band 1 holds the transducer-2 in a crimped state near the ears of the head.

This transducer-2 has a bone conduction microphone (vibration pickup mechanism) and a speaker for converting a received signal into a voice, and is arranged near the ear 3. As a result, the bone conduction sound signal near the ear is picked up and the sound from the speaker can be heard.

Reference numeral 4 denotes a first infrared light emitting / receiving element unit which is installed near the transducer-2, preferably outside the band 1 and slightly above the eye position, and an LED is usually used as the light emitting element. A photo diode is used as the light receiving element. The transducer-2 and the first light emitting / receiving element unit 4 are connected via the cords 5 and 6, respectively.
It is connected to a transmission / reception circuit unit 7 containing a battery. Microphone elements and speed in Transducer-2
Switching to the car is usually performed by a PTT switch installed in the transmitting / receiving circuit unit 7.

Reference numeral 8 denotes a second light emitting / receiving element unit corresponding to the first light emitting / receiving element unit 4, which is attached to the sun visor 9 or the like and exchanges signals with the first light receiving / emitting element unit 4 by infrared rays. Similarly to the first light emitting / receiving element unit 4, the second light emitting / receiving element unit 8 also has an LED light emitting element,
It is composed of a photodiode light receiving element, a transmitting / receiving circuit, a battery, and the like. The second light emitting / receiving element unit 8 is a code 10
Is connected to the telephone 11 via.

In the above structure, the voice of the speaker is picked up by the bone conduction microphone of the transducer-2 and input to the transmission circuit of the transmission / reception circuit unit 7. And
For example, an FM wave of 2.3 MHz is emitted from the light emitting element, which is received by the light receiving element of the second light receiving and emitting element unit 8 and, after demodulation, is transmitted to the telephone 11 as an audio signal.

On the contrary, the voice from the telephone 11 is, for example, 2.8.
An FM wave modulated to MHz is transmitted from the light emitting element of the second light emitting / receiving element unit 8. This is received by the light receiving element of the first light emitting and receiving element 4, demodulated, and then transferred to the transducer-2.
The speaker's skull vibrates the speaker's skull. As a result of this acting on the eardrum or the canal of the speaker, it is understood as a voice. As described above, according to the present invention, since transmission and reception are performed by bone conduction, there is an advantage that the received sound is not heard by anyone other than the speaker and that the external auditory canal is not blocked so that safe running is not hindered.

In the example shown in FIGS. 1 and 2, the band 1 is configured to be worn through the top of the head, but it may be configured to be worn by turning it around the back of the head. Further, the first light emitting / receiving element unit 4 is not limited to one place, but may be installed in a plurality of places such as the left and right sides of the band 1 and the central part. The same applies to the second light emitting / receiving element unit 8. Since the light receiving element is saturated when exposed to direct sunlight, in order to avoid this, the light receiving element is arranged above the eye level.

In order to make the above avoidance more reliable, the above arrangement is made, and the direction of the light receiving element is, for example, two directions, ie, upper front and rear upper, and the second light receiving and emitting element unit 8 is also installed correspondingly. do it. In addition, the transducer
2 is used only as a speaker, and a normal microphone can be separately installed as a microphone.

[0014]

INDUSTRIAL APPLICABILITY As described above, the present invention is not only safe because a telephone call can be made without using both hands in an automobile, but the received sound from the speaker is transmitted to the speaker by bone conduction. There is no fear that the passenger will hear the content of the conversation, and since infrared rays are used for transmission / reception with the telephone, the code will not be an obstacle.

[Brief description of the drawings]

FIG. 1 is a diagram showing a usage state of a speaker mounting portion in an embodiment of the present invention.

FIG. 2 is a diagram showing a usage state of the embodiment of the present invention.

[Explanation of symbols]

 1 band 2 transducer 3 ear 4 1st light emitting / receiving element unit 5 code 6 code 7 transceiver circuit unit 8 2nd light receiving / emitting element unit 9 sun visor 10 code 11 telephone

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04R 1/00 327

Claims (2)

[Claims] 1. A transducer that comprises a bone conduction microphone and a speaker and is held in a crimped state near the ears of the head.
A first light receiving and emitting element unit, which is provided at an arbitrary position on the head and includes a laser, an infrared light receiving element and a light emitting element, and is connected to the transducer and the first light receiving and emitting element unit. A cordless communication system using infrared rays, which includes a transmitting / receiving circuit unit and a second light emitting / receiving element unit corresponding to the first light emitting / receiving element unit installed in a vehicle and connected to a telephone. 2. The cordless communication system using infrared rays according to claim 1, wherein a plurality of the first light emitting / receiving element units and / or the second light emitting / receiving element units are arranged.