JPH098735A - Infrared transmitter, infrared receiver and infrared transmission system - Google Patents

Abstract

PURPOSE: To facilitate alignment in the case of infrared radiation and the level recognition of an inputted infrared signal in an infrared transmission system. CONSTITUTION: At a transmission adapter 3 for transmitting the infrared signal, AV signals supplied from terminals 10, 14a and 14b are frequency modulated, converted to the infrared signal by an infrared light emitting element 18 and spatially transmitted as a signal 4. A visible light emitting element 21 is arranged so that the almost same position as the position irradiated with infrared rays from a terminal 18 can be irradiated with emitted visible light 7. When a switch 20 is depressed, the almost same position as the position irradiated with the signal 4 from the element 18 is irradiated with the element 21 while being driven by a drive control circuit 19 at the same position as the signal 4 so that the position matching to a receiving element can be facilitated. Besides, since a reception adapter, to which the receiving element is fitted, is provided with an indicator for displaying the power of incident infrared rays, the check of an over input, etc., is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and system for converting a signal into an infrared signal and transmitting the signal spatially,
The present invention relates to an apparatus and system having a structure that facilitates alignment during infrared irradiation.

[0002]

2. Description of the Related Art A technique for spatially transmitting so-called AV signals such as video signals and audio signals by using infrared rays has been proposed. The AV signal is FM-modulated, frequency-multiplexed, and emitted by a light-emitting element such as a light-emitting diode. This optical signal is received by a light receiving element such as a PIN photodiode, converted into an electric signal, and demodulated.

For example, when this technique is applied to a camera-integrated video tape recorder, a signal in which a video signal and left and right audio signals are FM-modulated is directed from the camera-integrated video tape recorder to a television receiver. It is converted into an infrared signal and transmitted in space.

FIG. 6 shows an example of a system in which an AV signal is transmitted between devices using infrared rays as described above. The transmission unit 201 is attached to the camera-integrated video tape recorder 200. Also, the television receiver 2
A reception adapter 203 is attached to 02. The transmission unit 201 is a camera-integrated video tape recorder 2
The AV signal from 00 is FM-modulated, converted into an infrared signal, and transmitted to the reception adapter 203 attached to the television receiver 202. The received infrared signal is converted into an electric signal in the reception adapter 203,
FM demodulated and sent to the television receiver 202.

FIG. 7 shows the subcarrier frequency band of the infrared signal transmitted from the transmission unit 201 at this time.
The frequency of the video signal is 11.5M at the sync tip level.
Hz, and the white peak level is 13.5 MHz. The carrier frequencies of the left and right audio signals are 2.3 MHz and 2.8 MHz, respectively.

[0006]

In such an optical space transmission device, when an attempt is made to extend the transmission distance of an optical signal, the number of light emitting diodes, which are light emitting elements, is increased, or a large-sized light emitting device capable of obtaining a larger amount of light is obtained. A method such as using a diode can be considered. However, these methods have a problem that they are disadvantageous in terms of manufacturing cost of the device and power consumption of the device. This is particularly remarkable in a portable device such as the above-mentioned camera-integrated video tape recorder.

Further, in order to extend the transmission distance of the optical signal without adopting the above method, there is a method of narrowing the radiation directivity angle of the infrared rays emitted from the light emitting diode and sharpening the directivity. However, if the directivity is sharpened, there is a problem in that the reception side of the infrared signal, that is, a so-called service area is narrowed on the reception side, and it becomes difficult to perform positioning for good reception.

Further, on the receiving side, it is difficult to judge whether or not infrared rays for obtaining good characteristics are input, and therefore it is difficult for the user to judge whether or not the usage condition is appropriate. is there. That is,
Not only when the input infrared signal is too weak, but depending on the environment in which the device is used, an infrared signal of an excessive level that deteriorates the characteristics may be input. It was difficult to do.

Therefore, an object of the present invention is to provide an infrared transmitter capable of facilitating the alignment during irradiation of infrared rays.

Another object of the present invention is to provide an infrared receiver capable of easily recognizing the level of an input infrared signal.

Still another object of the present invention is to easily align the position when irradiating infrared rays and to easily recognize the level of the input infrared signal, so that the infrared signal is always in a good condition. Another object of the present invention is to provide an infrared transmission system capable of performing space transmission of.

[0012]

In order to solve the above-mentioned problems, the present invention is directed to transmitting means for modulating a supplied video and / or audio signal, converting it into an infrared signal and transmitting the same, and an irradiation position of the infrared signal. And an irradiating unit that irradiates a light beam for alignment to substantially the same position as the above.

In order to solve the above-mentioned problems, the present invention comprises a receiving means for receiving an infrared signal, and a display device for displaying according to the level of the signal received by the receiving means. An infrared signal receiving device characterized by:

Further, in order to solve the above-mentioned problems, the present invention modulates a supplied video and / or audio signal, converts it into an infrared signal, and transmits the infrared signal.
An infrared transmitter comprising an irradiation means for irradiating a light beam for alignment to a position substantially the same as the irradiation position of the infrared signal,
An infrared receiving device comprising a receiving means for receiving an infrared signal and a display device for displaying according to the level of the signal received by the receiving means, and transmitted from the transmitting means based on the light beam for alignment. The infrared transmission system is characterized in that the irradiation position of the infrared signal is adjusted and the level of the signal received by the receiving means is confirmed by the display means.

[0015]

According to the present invention, since the infrared transmitting device is equipped with the irradiation means for irradiating the position adjusting light beam to the position substantially the same as the irradiation position of the infrared signal, the user can confirm the irradiation position of the infrared signal. It is possible to align while doing.

Further, according to the present invention, since the infrared receiving device is provided with the display device for displaying according to the level of the signal received by the receiving means, the user confirms the level of the received signal. be able to.

Further, according to the present invention, there is provided an infrared transmitter having an irradiating means for irradiating a light beam for alignment at a position substantially the same as the irradiation position of the infrared signal, and the level of the signal received by the receiving means. Since an infrared transmission system is configured with an infrared receiving device including a display device that performs display according to, the user can perform alignment while checking the irradiation position of the infrared signal, In addition, the level of the received signal can be confirmed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an infrared transmission system using an infrared transmitter and an infrared receiver according to the present invention. In this example, a signal converted into an infrared signal is a video signal and an audio signal reproduced by a camera-integrated video tape recorder (hereinafter, both are collectively referred to as an AV signal).

The AV signal reproduced by the camera-integrated video tape recorder 1 is sent to the transmission adapter 3 via the AV cable 2. The transmitted AV signal is FM-modulated in the transmission adapter 3 and spatially transmitted as an infrared signal 4 by a light emitting element capable of emitting infrared light. The transmitted infrared signal 4 is received by the reception adapter 6 attached to the television receiver 5. The received infrared signal is converted into an electric signal in the reception adapter 6, FM demodulated, converted into an AV signal, and sent to the television receiver 5.

The transmitting adapter 3 has a light emitting element capable of emitting visible light, in addition to the infrared light emitting element for AV signal transmission. Then, the visible light emitting element is arranged so that the visible light from the light emitting element is irradiated to substantially the same position as the infrared ray from the infrared light emitting element. For example, these light emitting elements are arranged close to each other so that their light emitting surfaces are parallel to each other.

The visible light beam 7 is emitted from the visible light emitting element provided in the transmitting adapter 3. And
The visible light beam 7 illuminates a light receiving area (service area) of the receiving adapter 6 if the transmitting adapter 3 is installed at a correct position. Therefore, the transmitting adapter 3
The alignment with respect to the receiving adapter 6 may be performed so that the visible light beam 7 illuminates the service area of the receiving adapter 6.

Further, the receiving adapter 6 is provided with a detection circuit for detecting the level of the received infrared signal and an indicator (indicator) for displaying the detected level. As a result, the user can set the receiving adapter 6 to
It is possible to know whether or not the infrared signal is incident just enough.

In the infrared transmission system using the transmitting adapter 3 and the receiving adapter 6, visible light for alignment of the transmitting adapter 3 and the indicator of the receiving adapter 6 can be used together. As a result, it becomes possible to perform more accurate positioning and to obtain a good reception state with no excess or deficiency of received signals.

FIG. 2 shows an example of the structure of the transmission adapter 3. An AV cable 2 is connected to the input terminals 10, 14a, 14b, and an AV signal is supplied from the camera-integrated video tape recorder 1. A video signal is supplied to the input terminal 10. The supplied video signal is FM-modulated in the FM modulator circuit 11, and the high-pass filter 1
The low frequency band is cut so as not to affect the modulated left and right audio signals.

As shown in FIG. 7, the video signal is 6 to 2
The left and right audio signals, which will be described later, are modulated in a band of 0 MHz, and are modulated with 2.3 MHz and 2.8 MHz as carrier frequencies, respectively. Therefore, the cutoff frequency of the high pass filter 12 is, for example, 6
MHz. The modulated video signal with the low frequency band cut is supplied to the first input terminal of the adder 13.

Left channel audio signals (hereinafter referred to as L-ch signals) and right channel audio signals (hereinafter referred to as R-ch signals) are input to the input terminals 14a and 14b.
Are supplied respectively. These supplied signals are F
The signals are supplied to the M modulation circuits 15a and 15b and are FM-modulated. At this time, the L-ch signal is modulated at a carrier frequency of 2.3 MHz, and the R-ch signal is modulated at a carrier frequency of 2.8 MHz. The modulated L-ch signal and R-ch signal are supplied to the low-pass filters 16a and 16b as a modulated L-ch signal and a modulated R-ch signal, respectively.

In the low-pass filters 16a and 16b, the supplied modulated L-ch signal and modulated R-ch signal are cut in the high frequency range so that harmonics do not affect the above-mentioned modulated video signal. In this case, the cutoff frequencies of the low pass filters 16a and 16b are, for example,
It is set to 3 MHz. The outputs from the low-pass filters 16a and 16b are supplied to the second input terminal and the third input terminal of the adder 13, respectively.

In the adder 13, the modulated video signal supplied to the first input terminal and the modulated L-ch signal and the modulated R-ch signal supplied to the second and third input terminals, respectively, are synthesized, and the driver 17 is supplied. The supplied signal is output by the driver 17 as a signal for causing the infrared light emitting element 18 connected in the subsequent stage to emit light. This output from the driver 17 is the infrared light emitting element 1
8 and is converted into an infrared signal 4 for spatial transmission. As the infrared light emitting element 18, for example, a light emitting diode having a light emitting frequency in the infrared region is used.

The transmitting adapter 3 is also provided with a visible light emitting element 21 capable of emitting visible light for alignment with the receiving adapter 6. The visible light emitting element 21 is, for example, a combination of a small light bulb and a lens and has a strong directivity for the light emitted from the visible light emitting element 21.

As described above, this visible light emitting device 21
Is arranged so that the visible light to be emitted is emitted to substantially the same position as the infrared rays emitted from the infrared light emitting element 18.
For example, these light emitting elements are arranged adjacent to each other and are adjusted so that their light emitting surfaces are parallel to each other.

The visible light emitting element 21 may be any other one as long as the user can visually confirm the position irradiated with the light emitted from the visible light emitting element 21.

For example, a light emitting diode that emits light with a certain intensity may be used instead of a small light bulb. Alternatively, a small laser light source that emits light in the visible light region may be used. Further, the surface to be irradiated may be fluorescent and the light source may be ultraviolet.

The visible light emitting element 21 is driven and controlled by the light emitting element drive control circuit 19. That is, when the power of the transmitting adapter 3 is turned on, the light emitting element drive control circuit 19 drives the light emitting element drive control circuit 19 for a predetermined time, which is set for a predetermined time and is considered to be necessary for the alignment, for example, several seconds, and the visible light emitting element 21. Is emitted, and the visible light ray 7 is emitted.

A switch 20 is directly connected to the light emitting element drive control circuit 19. Then, even when the switch 20 is pressed, the visible light emitting element 21 can emit light for several seconds, for example.

Then, the user confirms the light spot on which the visible light beam 7 irradiates the receiving adapter 6 so that the visible light beam 7 irradiates the range in which the infrared signal 4 in the receiving adapter 6 can be received, The transmission adapter 3 is aligned.

In this example, the transmission adapter 3
Although the visible light emitting element 21 emits light for several seconds after the power is turned on, this is not limited to this example.
For example, the visible light emitting element 21 may emit light when the power of the transmission adapter 3 is turned on, and the emission may be stopped when the switch 20 is pressed.

In this example, the visible light emitting element 21 is driven by the light emitting element drive control circuit 1 so that the light is emitted only for a few seconds required for alignment after the switch 20 is pressed.
It is assumed that the control is performed at 9, but this is not limited to this example. For example, the visible light emitting element 21 may be controlled to emit light only while the switch 20 is continuously pressed.

The visible light emitting element 21 may emit light when the switch 20 is pressed once, and stop emitting light when the switch 20 is pressed again. At this time, even if the user does not press the switch 20 again, it is possible to cope with the user forgetting to press the switch 20 by automatically stopping the light emission after a predetermined time has elapsed.

FIG. 3 shows an example of the configuration of the receiving adapter 6. The infrared signal 4 emitted by the infrared light emitting element 18 of the transmission adapter described above enters the infrared light receiving element 30. For the infrared light receiving element 30, for example, a PIN photodiode capable of receiving infrared light is used. The infrared signal 4 incident on the infrared light receiving element 30 is restored to an electric signal and supplied to the amplifier 31. This signal supplied to the amplifier 31 is amplified and input to the input level detection circuit 32, the high pass filter 34, and the band pass filter 37.
a and 37b are supplied together.

The signal supplied to the high-pass filter 34 has its low frequency band cut off, and the band of the modulated video signal is extracted. The extracted modulated video signal is supplied to the FM demodulation circuit 35, FM-demodulated, and converted into a video signal, which is led to the output terminal 36.

The band-pass filters 37a and 37b have cut-off center frequencies of 2.3 MHz and 2.8 MHz, respectively. Therefore, in the signals supplied to these band pass filters 37a and 37b, unnecessary signal components are cut, and the modulated L-ch signal and the modulated R-ch signal are obtained.
Each signal is extracted. These modulations extracted
The L-ch signal and the modulated R-ch signal are fed to the FM demodulation circuit 38a,
38b, respectively, and FM demodulated into L-ch signals and R-ch signals. The L-ch signal and the R-ch signal are output to output terminals 39a and 39b, respectively.

The video signal derived to the output terminal 36, the L-ch signal derived to the output terminal 39a, and the output terminal 3
The R-ch signal led to 9b is sent to the television receiver 5 via a connection line.

The input level detection circuit 32 detects the level of the signal supplied from the amplifier 31. Then, as will be described later, from this detection result, it is predicted how much characteristics will be obtained by the optical power of the infrared signal 4 incident on the receiving adapter 6. The output from the input level detection circuit 32, that is, the characteristic prediction result is supplied to the indicator 33. Then, based on this prediction result, the optical power intensity of the infrared signal 4 incident on the infrared light receiving element 30 is displayed on the indicator 33.

FIG. 4 shows an example of the structure of the indicator 33 in the receiving adapter 6. This is an example of an indicator using four display light emitting diodes. In this example, the green light emitting diodes 40a, 40 are provided to the receiving adapter 6 so that the user can easily recognize them.
b and 40c are sequentially attached from the left, and the red light emitting diode 41 is attached to the left.

In the infrared transmission device according to the present invention, since the transmission method of the infrared signal is FM modulation transmission, the S / N of the signal depends on the input power level (C / N) of the infrared signal. Therefore, by detecting the input level of the infrared signal incident on the infrared light receiving element 30, it is possible to predict the S / N to some extent. That is, a predetermined S / N value is associated with a predetermined input level in advance.
This matching is done over several input levels. Then, at each stage, a predetermined light emitting diode in the indicator 33 is set to light up.

For example, the input level of the infrared signal 4 is S /
If the level is associated with N = 40 dB, only the light emitting diode 40a emits light and the input level is S / N = 4.
If equivalent to 5 dB, light emitting diodes 40a and 40b
Both lights up. The input level is S / N = 5
When the input level is equivalent to 0 dB or more and a sufficient S / N is obtained, the light emitting diodes 40a, 40
Adjust so that three of b and 40c are lit. By doing so, the user can easily know whether or not the infrared signal 4 having a sufficient characteristic is incident on the infrared light receiving element 30 of the receiving adapter 6.

Further, in such an infrared transmission device, if the power of the incident infrared light is too strong, the infrared light receiving element 30 will be saturated, or the dynamic range of the amplifier 31 or other circuits will be exceeded. , The characteristics deteriorate. Therefore, when the input level detection circuit 32 detects that the infrared signal 4 having such an excessive power is incident on the infrared light receiving element 30, the red light emitting diode 41 serving as a warning light is turned on to notify the user. It is supposed to do. Therefore, the user can adjust the position of the transmission adapter 3 so that the infrared signal 4 is received by the reception adapter 6 with an appropriate power.

In the above description, the indicator 33
Although the light-emitting diodes 40a, 40b, 40c, and 41 in FIG. 1 are arranged in rows in order from the left, this is not limited to this example. For example, these four light emitting diodes 40a, 40b, 40c, and 41 are
It may be arranged in columns.

Further, in the above description, the colors of the light emitting diodes 40a, 40b, and 40c are green and the light emitting diode 41 is red, but this is the general color arrangement for this purpose. The reason is not limited to this example. For example, it is possible to change the color stepwise by the power of the incident infrared signal 4.

Further, in the above description, in the level display of three levels on the indicator 33, the S / N level corresponding to the input power is 40 dB, 45 d.
B and 50 dB are set, but this is not limited to this example. For example, this S / N stage is
You may adjust so that the difference of S / N may be more remarkable, such as dB, 45 dB, and 55 dB.

Furthermore, in the above description, the display of the indicator 33 is the three-level display and the warning light, but this is not limited to this example. For example, this level display may be performed in more detail, such as in 4 steps or 5 steps. Further, the number may be reduced to a level such that there are practically no problems such as about two stages. This also applies to the warning light. For example, the warning light can be displayed in three stages and the warning lights to be turned on can be switched depending on the degree of the warning.

In the above description, the indicator 33 is displayed by using the light emitting diode.
This is not limited to this example. For example, as the indicator 33, a meter having a pointing plate can be used. Alternatively, the indicator 33 may be configured by a display device capable of displaying the numerical value indicating the stage corresponding to the input power.

Next, a modified example of the present invention will be described with reference to the drawings. This modification is an example of controlling the video playback device in a playback pause state during alignment adjustment in a transmission adapter of an infrared transmission device attached to a video playback device such as a camera-integrated video tape recorder.

FIG. 5 shows a transmission adapter 3 according to this modification.
An example of the configuration will be shown. In this configuration, the AV signal is F
The part that is M-modulated, converted into an infrared signal and spatially transmitted is the same as the corresponding part shown in FIG. 2 in the above-described embodiment. That is, through the input terminal 50, the FM
The video signal supplied to the modulation circuit 51 is 6 to 20 MH.
The signal is FM-modulated in the z band to be a modulated video signal, the low-pass is cut in the high-pass filter 52, and the adder 53
Is supplied to the first input terminal of.

The L-ch signal and the R-ch signal are supplied to the FM modulation circuits 55a and 55b through the input terminals 54a and 54b, respectively. Then, the L-ch signal is modulated with a carrier frequency of 2.3 MHz, and the R-ch signal is modulated with a carrier frequency of 2.8 MHz, to obtain a modulated L-ch signal and a modulated R-ch signal,
The harmonic components are cut by the low-pass filters 56a and 56b and are supplied to the second and third input terminals of the adder 53, respectively.

In the adder 53, the supplied modulated video signal, modulated L-ch signal and modulated R-ch signal are combined,
It is supplied to the infrared light emitting element 58 via the driver 57 and is transmitted as the infrared signal 4 in space.

Similar to the above-described embodiment, the transmitting adapter 3 is provided with a visible light emitting element 61 capable of emitting visible light for alignment with the receiving adapter 6.
The visible light emitting element 61 is a light emitting element drive control circuit 59.
Driven and controlled by. That is, when the switch 60 directly connected to the light emitting element drive control circuit 59 is pressed, the visible light emitting element 61 is driven for several seconds, and the visible light beam 7 is emitted.

Then, the user confirms the light spot on which the visible light beam 7 irradiates the receiving adapter 6 so that the visible light beam 7 irradiates the range where the infrared signal 4 in the receiving adapter 6 can be received, The transmission adapter 3 is aligned.

In this modification, the control signal from the light emitting element drive control circuit 59 is also supplied to the mode control circuit 62. This mode control circuit 62
Is capable of outputting a control signal for controlling the operation of the camera-integrated video tape recorder 1 based on the control signal supplied from the light emitting element drive control circuit 59.

Further, this mode control circuit 62
Is connected to a mechanical control circuit 63 for controlling operations such as running and reproduction of the tape in the camera-integrated video tape recorder 1. This connection
It may be an electric one using a cable or the like, or an infrared transmission device may be provided in each of the transmission adapter 3 and the camera-integrated video tape recorder 1 to perform infrared data communication.

When the switch 60 is pressed, the visible light emitting element 61 is driven and the mode control circuit 6
2 is supplied with a control signal. Then, the mode control circuit 62 sends to the mechanical control circuit 63 of the camera-integrated video tape recorder 1 a control signal for instructing a pause (pause) of reproduction in the camera-integrated video tape recorder 1.

Then, the mechanical control circuit 63 supplies a control signal to the servo circuit 64, and the servo circuit 64 supplies a control signal to the drum driver 65 and the capstan driver 66, respectively. The drum driver 65 supplied with the control signal controls the rotation of the rotary drum provided with the head, and the capstan driver 66 controls the capstan motor for driving the tape running system. With these controls, the camera-integrated video tape recorder 1
Is in a playback pause state.

When the alignment work is completed and the emission of the visible light emitting element 61 is stopped by the control of the light emitting element drive control circuit 59, a control signal is sent from the light emitting element drive control circuit 59 to the mode control circuit 62. Supplied. Then, from the mode control circuit 62 to the mechanical control circuit 6 of the camera-integrated video tape recorder 1.
3, a control signal for instructing cancellation of the reproduction pause in the camera-integrated video tape recorder 1 is sent. Then, based on the sent control signal, the playback pause state of the camera-integrated videotape recorder 1 is released, and the playback state is set.

As described above, by linking the position adjustment of the infrared signal irradiation position in the transmission adapter 3 and the reproduction pause state of the camera-integrated video tape recorder 1, the user can perform reproduction pause and pause cancel operations one by one. Since there is no need to do so, the alignment work becomes easy.

[0065]

As described above, according to the present invention, the user can perform the alignment while confirming the position of the infrared radiation from the transmitting side by the visible light, which has been difficult in the past. There is an effect that the alignment can be easily performed.

Further, according to the present invention, since the receiving side is provided with the indicator showing the incident power of the infrared rays, it is possible to easily grasp whether or not the infrared rays having a sufficient characteristic are incident. There is an effect that can be.

Further, for example, infrared rays are transmitted from a shorter distance than is necessary, and therefore, when infrared rays are incident such that the characteristics are deteriorated, the warning light is turned on, so that the situation can be easily judged. There is.

Furthermore, by combining the reception side indicator and the transmission side infrared ray irradiation position by the visible light, there is an effect that the transmission condition of the infrared signal can be easily improved. .

Therefore, the infrared transmission device according to the present invention can reliably transmit the infrared signal to a long distance even if the directivity of the infrared light emitted from the infrared light emitting element on the transmission side is narrowed. . Therefore, the number of light emitting diodes used for infrared light emission can be reduced, and the cost and power consumption of the device can be suppressed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of an infrared transmission system using an infrared transmitter and an infrared receiver according to the present invention.

FIG. 2 is a block diagram showing an example of a configuration of a transmission adapter.

FIG. 3 is a block diagram showing an example of a configuration of a reception adapter.

FIG. 4 is a schematic diagram showing an example of the configuration of an indicator.

FIG. 5 is a schematic diagram showing an example of a configuration of a transmission adapter according to a modification of the present invention.

FIG. 6 is a schematic diagram showing an example of a system in which an AV signal is transmitted between devices using infrared rays.

FIG. 7 is a schematic diagram showing a subcarrier frequency band of an infrared signal when an AV signal is transmitted between devices using infrared rays.

[Explanation of symbols]

 3 Transmitting Adapter 4 Infrared Signal 6 Receiving Adapter 7 Visible Ray 18,58 Infrared Light Emitting Element 19,59 Light Emitting Element Drive Control Circuit 20,60 Switch 21,61 Visible Light Emitting Element

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04B 10/14 10/04 10/06

Claims (7)

[Claims] 1. An infrared transmitter for converting a modulated video and / or audio signal into an infrared signal and transmitting the infrared signal, wherein the supplied video and / or audio signal is modulated and converted into an infrared signal for transmission. An infrared transmitter comprising: a means and an irradiation means for irradiating a light beam for alignment at a position substantially the same as the irradiation position of the infrared signal. 2. The infrared transmitting device according to claim 1, wherein the irradiation means emits light for a predetermined time after the power of the device is turned on. 3. The infrared transmission device according to claim 1, wherein the irradiation means emits light for a predetermined time at an arbitrary timing by a user operation while the device is in use. Infrared transmitter. 4. The infrared transmitter according to claim 1, wherein the reproducing device obtains the video and / or audio signal, and the reproducing device is turned on while the alignment light beam is emitted. An infrared signal transmitting apparatus comprising a control means for temporarily suspending the infrared signal transmitting apparatus. 5. An infrared receiving device for receiving an infrared signal obtained by converting a modulated AV signal, comprising: receiving means for receiving the infrared signal; and display according to the level of the signal received by the receiving means. An infrared signal receiving device, comprising: a display device for performing the operation. 6. The infrared signal receiving device according to claim 5, further comprising warning means for warning that the level of the signal has become excessive enough to cause deterioration of characteristics. 7. An infrared transmission system for converting a modulated video and / or audio signal into an infrared signal for spatial transmission, wherein the supplied video and / or audio signal is modulated, converted into an infrared signal and transmitted. Means, and an infrared transmitter comprising an irradiation means for irradiating a light beam for alignment to a position substantially the same as the irradiation position of the infrared signal, a receiving means for receiving the infrared signal, and a signal received by the receiving means. And an infrared receiving device including a display device that performs display according to the level of, and adjusts the irradiation position of the infrared signal transmitted from the transmitting means based on the light beam for alignment, and the receiving means An infrared transmission system characterized in that the level of the signal received by the device is confirmed by the display means.