JPH0779493A - Infrared ray signal receiver - Google Patents

Abstract

PURPOSE:To make a mount part light, to enhance a sense of wearing and to stably receive an infrared ray signal by forming the mount part and a demodulation unit separately, mounting an infrared ray receiving section and a speaker section to the mount section and mounting a battery, a power supply circuit section, a demodulation circuit section and a circuit system including a speaker drive to the demodulation unit. CONSTITUTION:An infrared ray receiving section 42 and a speaker section 41 are mounted to a mount section 40, a battery 54, a power supply circuit section 55, a demodulation circuit section 52, and a circuit system including an amplifier circuit 53 including a speaker drive are mounted to the demodulation unit 50. An ear receiver of the mount section 40 has only to be provided with the speaker section and the infrared ray receiving section and a sense of wearing is attained through small size and light weight configuration. When the ear receiver is mounted, the stable reception is attained without being exposed on a head and disturbed by hair.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared signal receiving device in a system for wirelessly transmitting an audio signal by infrared rays.

[0002]

2. Description of the Related Art Headphones having an infrared receiving section or headphone connected to a demodulating unit having an infrared receiving section are mounted by infrared modulation of a voice signal from an audio device and a voice signal from a microphone to transmit the result in space. A system has been put into practical use in which a user who is listening to the wirelessly transmitted audio signal can hear it.

5 and 6 show an external view and a circuit block diagram as an example of the system. Reference numeral 1 denotes an audio device such as a CD player or an audio amplifier. The audio signals (AU _L , AU _R ) output from the audio device 1 are supplied to an infrared transmitter 2. The infrared transmitter 2 is provided with a modulator 4 for FM-modulating a voice signal (AU _L , AU _R ) by a predetermined carrier frequency, and outputs a modulation signal RF of the voice signal (AU _L , AU _R ). This modulated signal RF is supplied to the infrared output unit 3,
The light emitting diode is turned on / off (luminance modulation) according to the modulation signal RF, so that the audio signal is spatially transmitted as a modulated infrared signal.

On the other hand, a headphone 10 is provided as a receiving device for receiving this. The headphone 10 is provided with an infrared receiver 11 at a position, for example, the top of the head, so that the transmitted infrared signal can be received. The infrared receiver 11 amplifies the received infrared light as an electric signal and outputs the electric signal, which is supplied to the demodulation circuit 13. The demodulation circuit 13 performs audio signal (A
U _L, demodulates the AU _R), supplied to the amplifier circuit 14. The amplifier circuit 14 serves as a speaker drive circuit, supplies a drive signal to the speaker 12, and causes the speaker 12 to output L and R sounds.

Reference numeral 15 denotes a battery section composed of, for example, two AA dry cells, and 16 denotes a power supply circuit section for supplying a driving power supply voltage to each circuit section. The circuit configuration including the battery unit 15 is configured to be arranged inside the headphone 10, for example, in the housing of the speaker unit or in the vicinity thereof. In this system, the user can listen to the voice wirelessly by wearing the headphone 10.

7 and 8 are an external view and a circuit block diagram as another system example. 5 is a microphone, 6
Is a microphone amplifier, and 7 is an infrared transmitter.
The audio signal AU from the microphone 5 is the microphone amplifier 6
Is supplied to the infrared transmitter 7 via.

The infrared transmitter 7 has a voice signal A.
Modulator 9 for FM-modulating U with a predetermined carrier frequency
Is provided and outputs the modulation signal RF of the audio signal AU.
Then, a voice signal is spatially transmitted as an infrared signal in which the light emitting diode of the infrared output unit 3 is brightness-modulated based on the modulation signal RF.

On the other hand, an ear receiver 20 and a demodulation unit 30 are separately provided as a receiving device for receiving this. The ear receiver 20 is provided with a cord 22, and the plug 23 at the tip of the cord 22 is connected to the demodulation unit 30.
Connected to the output jack of. 21 is a speaker.
Reference numeral 24 denotes an ear hanging hanger, and the ear receiver 20 is worn by the user so that the ear hanging hanger 24 is rotated around the ear so that the speaker 24 contacts the ear.

The demodulation unit 30 is, for example, a device having a size and shape that fits in a user's chest pocket, and an infrared receiver 31 is provided on the upper surface of the demodulator unit 30 so that it can receive transmitted infrared signals. .

The infrared receiver 31 amplifies the received infrared light as an electric signal and outputs the electric signal, which is supplied to the demodulation circuit 32. The demodulation circuit 32 performs a predetermined demodulation process on the audio signal A.
U is demodulated and output, and supplied to the amplifier circuit 33. The amplifier circuit 33 serves as a speaker drive circuit, supplies a drive signal to the speaker 21 of the ear receiver 20 via the cord 22, and causes the speaker 21 to output sound.

Reference numeral 34 indicates a battery section made of, for example, a rechargeable battery, and 35 indicates a power supply circuit section for supplying a driving power supply voltage to each circuit section. As described above, the circuit configuration including the battery section 34 other than the speaker 21 is mounted on the demodulation unit 30 side. In this system as well, the user can wear the ear receiver 20 and connect the demodulation unit 30 to listen to the voice from the microphone or the like wirelessly.

[0012]

However, these infrared transmission systems have the following problems. First, in the case of the example of FIGS. 5 and 6, since the entire circuit configuration including the battery unit 15 is mounted inside the headphone 10, the weight of the headphone 10 becomes considerably heavy and the wearing feeling is very bad. Also, due to its weight, the user is very tired if worn for a certain time. In addition, there is a problem that it is difficult to use the battery for a long time because the number of batteries to be loaded cannot be increased or increased in order to prevent the weight and the size from increasing.

In the case of the examples of FIGS. 7 and 8, the demodulation unit 30 is usually used on a chest pocket or table, and the battery unit and the circuit system are mounted on the demodulation unit 30. Therefore, the ear receiver 20 side is considerably lightweight. Therefore, the feeling of wearing is good. Of course, this ear receiver 20
Considering a type that uses headphones instead of, it is possible to construct a lightweight and comfortable wearing headphone.

However, since the demodulation unit 30 is placed in a relatively low position such as a chest pocket or a table, the infrared receiver 31 of the demodulation unit 30 is easily blocked by clothes, books, desks, people, etc. There is a problem that it is difficult for the receiving unit 31 to always receive an infrared signal stably.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and reduces the weight of the headphone, ear receiver, etc., to improve the wearing feeling and stabilize the infrared signal. It is an object of the present invention to provide an infrared signal receiving device capable of receiving.

For this reason, in the infrared signal receiving apparatus for receiving the infrared light modulated and output by the audio signal and outputting the audio, the mounting portion (headphone, ear receiver, etc.) and the demodulation unit are formed separately. An infrared light receiving portion and a speaker portion are mounted on the mounting portion, and the demodulation unit includes a battery, a power supply circuit portion, a demodulation circuit portion for signals from the infrared light receiving portion, and a signal demodulated by the demodulation circuit portion. A circuit system including a speaker drive circuit section that supplies audio to the section to output audio is configured.

[0017]

[Function] If only the speaker part and the infrared receiving part (light receiving element and amplifying circuit) are mounted on the mounting part to be mounted on the head or around the ear, the weight does not become heavy, and good mounting is possible. It is possible to set the infrared reception position at a high position and to receive a stable signal.

[0018]

1 and 2 are an external view and a circuit block diagram of an infrared signal receiving apparatus having a headphone as a mounting portion according to a first embodiment of the present invention.

Reference numeral 40 denotes a headphone, and 41 denotes a speaker section. Further, an infrared receiver 42 is formed on the top of the headphone 40. Headphones 40
A code 43 is derived from the multipolar connector 44. Reference numeral 50 is a demodulation unit having a shape and size that fits in a breast pocket, for example, and a connector jack 51 is provided as an input / output terminal so that the multipolar connector 44 can be connected.

As can be seen in FIG. 2, the multi-pole connector 44
The signal line of the code 43 by the headphone 40
The infrared reception signal and the speaker drive signal are input / output between the demodulation unit 50 and the demodulation unit 50.

As shown in FIG. 2, the demodulation unit 50 is provided with a demodulation circuit 52 and an amplification circuit 53, and also has a battery section 54 such as a dry battery or a rechargeable battery, and a power supply circuit 55. And the power supply circuit 5
From 5, the multi-polar connector 44 connected to the connector jack 51 and one signal line of the cord 43 are used to supply the reverse bias voltage V _BIAS to the photodiode functioning as a photoelectric conversion circuit in the infrared receiver 42. ing.

In the infrared receiver 42 operated by the reverse bias voltage supplied from the demodulation unit 50, for example, as shown in FIG. 5, the FM modulated audio signals (AU _L , AU) output from the infrared transmitter 2 are output. _It will receive infrared rays based on _R ).

The infrared receiver 42 amplifies the received infrared light as an electric signal (FM modulation signal RF) and outputs it.
This FM modulation signal RF is applied to the code 43 and the multi-pole connector 4
It is supplied to the demodulation circuit 52 in the demodulation unit 50 via one signal line of No. 4 of FIG. The demodulation circuit 52 demodulates the audio signal (AU _L , AU _R ) by a predetermined demodulation process and supplies it to the amplification circuit 53. The amplifier circuit 53 serves as a speaker drive circuit and outputs a drive signal to the speaker unit 41. The drive signals of two units of L and R are input from the connector jack 51 to the headphone 40 side through one signal line of the multipolar connector 44 and the cord 43, and are supplied to the speaker units 41, 41. Then, L and R sounds are output from the speaker units 41 and 41.

In addition, 5 in the demodulation unit 50 of FIG.
Reference numeral 6 is a power switch, 57 is a volume switch, and 58 is a frequency selection switch, which are not shown in FIG. That is, the operation of the power switch 56 turns on / off the power supply operation of the power circuit 55.
Turned off. In addition, the variable resistor in the amplifier circuit 53 is changed according to the operation of the volume 57, and the output volume from the speaker unit 41 of the headphone 40 is adjusted.

Further, by the frequency selection switch 58,
The demodulation frequency in the demodulation circuit 52 is selected. For example, when various audio signals are wirelessly transmitted using a plurality of frequencies in the same room, the audio desired to be heard can be selected by switching the frequency selection switch 58 (of course, corresponding to this). FM modulation frequency can be set on the infrared transmitter side as well).

In this embodiment having such a configuration, first of all, the headphone is provided with an infrared receiving section 42, that is, a light receiving element such as a photodiode and a first-stage amplifier circuit element in addition to the minimum required speaker section 41 in the headphone. Only the weight does not increase, and the total weight does not increase. In addition, since it is not necessary to mount a large number of circuits and batteries, the degree of freedom in housing design is increased and the size can be reduced. From these things, it is possible to provide a headphone with a good wearing feeling, and it is possible to eliminate discomfort and fatigue during wearing.

Furthermore, since the infrared receiver 42 is located on the top of the headphone 40, stable reception is possible and the performance of the wireless system can be improved. Further, the battery unit 54 is the demodulation unit 50.
Since it is mounted on the device, and it is not necessary to particularly consider the feeling of wearing, it is possible to cope with a larger battery to some extent. Therefore, it can be easily realized as a receiving device that can be driven for a long time.

Next, FIGS. 3 and 4 are an external view and a circuit block diagram of an infrared signal receiving apparatus as a second embodiment in which the mounting portion is an ear receiver.

Reference numeral 60 denotes an ear receiver, and 61 denotes a speaker section. The ear receiver 60 is mounted on the user by rotating the ear hook hanger 62 around the ear so that the speaker portion 61 comes into contact with the ear. Further, the ear receiver 60 has an antenna-like protrusion on the upper portion of the ear receiver 60. The portion 64 is provided, and the infrared receiver 63 is provided at the tip thereof.
Is attached. Further, a cord 65 with a four-pole plug 66 is led out from the ear receiver 60.

Reference numeral 70 is a demodulation unit having a shape and size that fits in a chest pocket, for example, and a 4-pole jack 71 is provided as an input / output terminal so that the 4-pole plug 66 can be connected. The demodulation unit 70 has substantially the same configuration as the demodulation unit 50 of the first embodiment described above, and 72 is a demodulation circuit, 73 is an amplification circuit, 74 is a battery section, and 75 is a power supply circuit. Reference numeral 76 is a power switch, 77 is a volume switch, and 78 is a frequency selection switch.

As can be seen from FIG. 4, the infrared reception signal and the speaker drive signal are input and output between the ear receiver 60 and the demodulation unit 50 by the four-unit signal line of the code 65 by the four-pole plug 66. Has been done.

That is, from the power supply circuit 75, the 4-pole plug 66
The reverse bias voltage V _BIAS for the light receiving element (phytodiode) in the infrared receiver 63 is supplied by using one signal line of the code 65 according to the above-mentioned code. In the infrared receiver 63, for example, as shown in FIG. Infrared light based on the FM-modulated audio signal AU output from the infrared transmitter 7 is received, amplified as an electric signal (FM modulation signal RF), and output.

This FM modulated signal RF is code 65 and 4
Demodulation unit 70 via one signal line of pole plug 66
Is supplied to the demodulation circuit 72 and the audio signal AU is demodulated. Then, a drive signal is output to the speaker section 61 by the amplifier circuit 73 as a speaker drive circuit. This drive signal is input from the jack 71 to the ear receiver 60 side via one signal line of the 4-pole plug 66 and the cord 65, and is supplied to the speaker unit 61. Then, it is output as sound from the speaker unit 61.

Also in this embodiment, the ear receiver 60, which is the mounting portion, only needs to be provided with the speaker portion 61 and the infrared receiving portion 63, and the size and weight can be reduced, and a good wearing feeling can be obtained. Further, the infrared receiver 63 has the protrusion 6
According to 4, the user can wear the ear receiver 60 and expose it on the head, and can receive infrared rays satisfactorily without being disturbed by the hair. Also, the infrared receiver 63 is at the highest position in the receiving device,
The receiving operation is hardly disturbed by a desk or a person. Of course, also in this embodiment, the battery unit 74 is mounted on the demodulation unit 70, and the battery can be upsized to some extent, so that it can be easily realized as a receiving device that can be driven for a long time.

Although the embodiment has been described above, the present invention is not limited to this embodiment and various modifications can be made. In particular, the connection between the mounting portion (headphones, ear receivers, etc.) and the demodulation unit, the number of signal lines, etc. should be variously changed according to the infrared transmission / reception system.

There are various conceivable shapes of the mounting portion, particularly the arrangement of the infrared receiving portion and its shape, which are set according to the arrangement position of the infrared transmitting means (for example, infrared transmitter) used in the system and the output directivity. It should be done. Further, the mounting portion is not limited to the headphone and the ear receiver as in the embodiment.

[0037]

As described above, in the infrared signal receiving apparatus of the present invention, the mounting portion (headphone, ear receiver, etc.) and the demodulation unit are formed separately, and the mounting portion is equipped with the infrared light receiving portion and the speaker portion. Moreover, the demodulation unit is configured to have a circuit system including a battery, a power supply circuit section, a demodulation circuit section, and a speaker drive circuit section. To improve the feeling of wearing, and not to get tired even if you wear it for a long time,
There is an effect that the infrared signal can be stably received and the performance as a wireless transmission system can be improved.

Further, since the power supply system is mounted on the demodulation unit and the battery can be upsized to some extent, there is an advantage that it can be easily realized as a receiving device which can be driven for a long time.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a circuit block diagram of a first embodiment.

FIG. 3 is an explanatory diagram of a second embodiment of the present invention.

FIG. 4 is a circuit block diagram of a second embodiment.

FIG. 5 is an explanatory diagram of a conventional infrared transmission system.

FIG. 6 is a circuit block diagram of a conventional infrared transmission system.

FIG. 7 is an explanatory diagram of a conventional infrared transmission system.

FIG. 8 is a circuit block diagram of a conventional infrared transmission system.

[Explanation of symbols]

 40 Headphones 41, 61 Speaker part 42, 63 Infrared receiving part 43, 65 Code 44 Multipolar connector 50, 70 Demodulation unit 51 Connector jack 52, 72 Demodulation circuit 53, 73 Amplification circuit 54, 74 Battery part 55, 75 Power supply circuit 60 Ear receiver 62 Ear hook hanger 64 Projection 66 4 pole plug

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04R 1/10 101 B

Claims (1)

[Claims] 1. An infrared signal receiving device for receiving infrared sound modulated and output by a sound signal and outputting the sound, wherein a mounting portion and a demodulation unit are formed separately, and the mounting portion includes an infrared light receiving portion and a speaker portion. A battery, a power supply circuit unit, a demodulation circuit unit for signals from the infrared light receiving unit, and a speaker drive circuit for supplying the signal demodulated by the demodulation circuit unit to the speaker unit and outputting the sound are mounted on the demodulation unit. An infrared signal receiving device characterized in that a circuit system including a unit is mounted.