JPH1056426A - Infrared signal transmitter - Google Patents
Infrared signal transmitterInfo
- Publication number
- JPH1056426A JPH1056426A JP8208327A JP20832796A JPH1056426A JP H1056426 A JPH1056426 A JP H1056426A JP 8208327 A JP8208327 A JP 8208327A JP 20832796 A JP20832796 A JP 20832796A JP H1056426 A JPH1056426 A JP H1056426A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- angle
- angle modulation
- infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は赤外線信号伝送装
置に関し、特に、発光ダイオードの光強度および赤外線
の伝送距離を大きくする赤外線信号伝送装置に係わる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared signal transmission device, and more particularly to an infrared signal transmission device for increasing the light intensity of a light emitting diode and the transmission distance of infrared light.
【０００２】[0002]
【従来の技術】従来より、図３に示すような親機M2およ
び子機T2で構成された赤外線信号伝送装置が知られてい
る。このような赤外線伝送装置において親機M2は、ＣＬ
Ｋ生成回路M21と、角度変調回路M22と、Ｅ／Ｏ変換回路
M23とを有し、子機T2は、Ｏ／Ｅ変換回路T21と、コンパ
レータT22と、復調器T23と、スピーカSP2とを有する。2. Description of the Related Art Conventionally, an infrared signal transmission device including a master unit M2 and a slave unit T2 as shown in FIG. 3 has been known. In such an infrared transmission device, the master unit M2 is
K generation circuit M21, angle modulation circuit M22, E / O conversion circuit
The slave unit T2 includes an O / E conversion circuit T21, a comparator T22, a demodulator T23, and a speaker SP2.
【０００３】親機M2のＥ／Ｏ変換回路M23はＬＥＤ駆動
回路M231、発光ダイオードLED21、LED22、LED23で構成
され、子機T2のＯ／Ｅ変換回路T21はフォトダイオードP
D2、増幅器T211で構成されている。音声信号S21が入力
される角度変調回路M22はＣＬＫ生成回路M21およびＥ／
Ｏ変換回路M23のＬＥＤ駆動回路M231に接続されてい
る。Ｅ／Ｏ変換回路M23の発光ダイオードLED21、LED2
2、LED23は直列に接続され、ＬＥＤ駆動回路M231に接続
されている。Ｏ／Ｅ変換回路T21は増幅器T211がフォト
ダイオードPD2に接続され、増幅器T211がコンパレータT
22、復調器T23を介してスピーカSP2に接続されている。The E / O conversion circuit M23 of the master unit M2 comprises an LED driving circuit M231, light emitting diodes LED21, LED22, and LED23, and the O / E conversion circuit T21 of the slave unit T2 has a photodiode P.
D2 and an amplifier T211. The angle modulation circuit M22 to which the audio signal S21 is input is connected to the CLK generation circuits M21 and E /
It is connected to the LED drive circuit M231 of the O conversion circuit M23. Light-emitting diodes LED21 and LED2 of E / O conversion circuit M23
2. The LEDs 23 are connected in series and connected to the LED drive circuit M231. In the O / E conversion circuit T21, the amplifier T211 is connected to the photodiode PD2, and the amplifier T211 is connected to the comparator T2.
22, connected to the speaker SP2 via the demodulator T23.
【０００４】このように構成された赤外線信号伝送装置
において、親機M2では音声信号S21がＣＬＫ生成回路M21
から送出される角度変調クロックφ21をキャリアとして
角度変調回路M22で角度変調（PWM変調）される。角度変
調回路M22からの角度変調信号φ22はＥ／Ｏ変換回路M23
に送出され、Ｅ／Ｏ変換回路M23のＬＥＤ駆動回路M231
および発光ダイオードLED21、LED22、LED23で電気信号
から赤外線φ23に変換し、放出される。[0004] In the infrared signal transmission device configured as described above, the master device M2 outputs the audio signal S21 to the CLK generation circuit M21.
Is angle-modulated (PWM-modulated) by an angle modulation circuit M22 using the angle modulation clock φ21 sent from the controller as a carrier. The angle modulation signal φ22 from the angle modulation circuit M22 is supplied to an E / O conversion circuit M23.
And the LED drive circuit M231 of the E / O conversion circuit M23
In addition, the light emitting diodes LED21, LED22, and LED23 convert the electric signal into infrared light φ23, which is emitted.
【０００５】子機T2では親機M2からの赤外線φ23をＯ／
Ｅ変換回路T21のフォトダイオードPD2および増幅器T211
で赤外線から電気信号に変換した後、コンパレータT22
で出力レベルを調節され、電気信号φ24となる。復調器
T23ではコンパレータT22からの電気信号φ24を角度変調
信号φ22に復元し、復元された角度変調信号φ25として
スピーカSP2に送出される。スピーカSP2では、復元され
た角度変調信号φ25を音声信号S22に復調（PWM復調）
し、出力する。[0005] In the slave unit T2, the infrared ray φ23 from the master unit M2 is changed to O /.
Photodiode PD2 and amplifier T211 of E conversion circuit T21
After converting from infrared light to electric signal with comparator T22
And the output level is adjusted to become an electric signal φ24. Demodulator
At T23, the electric signal φ24 from the comparator T22 is restored to the angle modulation signal φ22, and is transmitted to the speaker SP2 as the restored angle modulation signal φ25. In the speaker SP2, the restored angle modulated signal φ25 is demodulated into the audio signal S22 (PWM demodulation).
And output.
【０００６】[0006]
【発明が解決しようとする課題】このような赤外線信号
伝送装置では、角度変調信号をそのままＥ／Ｏ変換して
いるため、発光ダイオードの仕様上、光の強度を大きく
することができず、発光ダイオードを複数個用いて光の
強度を補わなければならず、また、赤外線の伝送距離が
小さいという難点があった。In such an infrared signal transmission device, since the angle modulated signal is directly E / O converted, the light intensity cannot be increased due to the specifications of the light emitting diode, and the light emission is not possible. There is a problem that the intensity of light must be compensated for by using a plurality of diodes, and the transmission distance of infrared rays is short.
【０００７】本発明はこのような難点を解決するため
に、角度変調信号の立ち上がりおよび立ち下がりを検出
してデューティの小さいパルスに変換した後、それぞれ
別の発光ダイオードから赤外線として伝送するため、発
光ダイオードの光強度を大きくすることができ、また、
少ない発光ダイオードで赤外線の伝送距離を大きくする
ことができる赤外線信号伝送装置を提供することを目的
としている。In order to solve such a problem, the present invention detects rising and falling edges of an angle modulation signal, converts them into pulses having a small duty, and transmits the pulses as infrared rays from different light emitting diodes. The light intensity of the diode can be increased,
It is an object of the present invention to provide an infrared signal transmission device that can increase the transmission distance of infrared light with a small number of light emitting diodes.
【０００８】[0008]
【課題を解決するための手段】前述した目的を達成する
ため、本発明による赤外線信号伝送装置は、ベースバン
ドの音声信号を角度変調信号に変調する角度変調回路
と、角度変調信号の立ち上がりを検出する立り上がり微
分回路と、角度変調信号の立ち下がりを検出する立ち下
がり微分回路と、立ち上がり微分回路および立ち下がり
微分回路からの電気信号を赤外線に変換するＥ／Ｏ変換
回路と、Ｅ／Ｏ変換された赤外線を電気信号に変換する
Ｏ／Ｅ変換回路と、Ｏ／Ｅ変換された電気信号の出力レ
ベルを調整するコンパレータと、コンパレータからの電
気信号を角度変調信号に復元する復調器とを有する。In order to achieve the above object, an infrared signal transmission device according to the present invention comprises: an angle modulation circuit for modulating a baseband audio signal into an angle modulation signal; A rising differential circuit, a falling differential circuit for detecting the falling of the angle modulation signal, an E / O conversion circuit for converting an electric signal from the rising differential circuit and the falling differential circuit into infrared light, and an E / O. An O / E conversion circuit for converting the converted infrared light into an electric signal, a comparator for adjusting the output level of the O / E converted electric signal, and a demodulator for restoring the electric signal from the comparator into an angle-modulated signal. Have.
【０００９】このような赤外線信号伝送装置では、角度
変調信号の立ち上がりおよび立ち下がりを検出してデュ
ーティの小さいパルスに変換した後、それぞれ別の発光
ダイオードから赤外線として伝送するため、発光ダイオ
ードの光強度および赤外線の伝送距離を大きくすること
ができる。In such an infrared signal transmission device, the rising and falling edges of the angle-modulated signal are detected and converted into pulses having a small duty, and then transmitted as infrared rays from different light-emitting diodes. And the transmission distance of infrared rays can be increased.
【００１０】[0010]
【発明の実施の形態】以下、本発明による赤外線信号伝
送装置の好ましい一実施例を示す図面を参照して詳述す
る。図１に示すような本発明による赤外線信号伝送装置
は、親機M1および子機T1で構成され、親機M1は、ＣＬＫ
生成回路M11と、ベースバンドの音声信号S11を矩形波の
角度変調信号φ12に変調する角度変調回路M12と、イン
バータM13と、角度変調信号φ12の立ち上がりを検出す
る立ち上がり微分回路M14と、角度変調信号φ12の立ち
下がりを検出する立ち下がり微分回路M15と、立ち上が
り微分回路M14および立ち下がり微分回路M15からの電気
信号を赤外線φ13、φ14に変換するＥ／Ｏ変換回路M16
とを有し、子機T1は、Ｅ／Ｏ変換された赤外線φ13、φ
14を電気信号に変換するＯ／Ｅ変換回路T11と、Ｏ／Ｅ
変換された電気信号の出力レベルを調節するコンパレー
タT12と、コンパレータT12からの電気信号φ15を角度変
調信号φ12に復元する復調器T13と、スピーカSP1とを有
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of an infrared signal transmission device according to the present invention will be described in detail with reference to the drawings. The infrared signal transmission device according to the present invention as shown in FIG. 1 includes a master unit M1 and a slave unit T1, and
A generation circuit M11, an angle modulation circuit M12 that modulates the baseband audio signal S11 into a rectangular wave angle modulation signal φ12, an inverter M13, a rising differentiation circuit M14 that detects a rise of the angle modulation signal φ12, and an angle modulation signal. A falling differentiating circuit M15 for detecting the falling of φ12, and an E / O converting circuit M16 for converting electric signals from the rising differentiating circuit M14 and the falling differentiating circuit M15 to infrared rays φ13 and φ14.
And the slave unit T1 is provided with infrared rays φ13, φ
An O / E conversion circuit T11 for converting 14 into an electric signal;
It has a comparator T12 for adjusting the output level of the converted electric signal, a demodulator T13 for restoring the electric signal φ15 from the comparator T12 to an angle modulation signal φ12, and a speaker SP1.
【００１１】また、親機M1のＥ／Ｏ変換回路M16はＬＥ
Ｄ駆動回路M161、M162および発光ダイオードLED11、LED
12で構成され、子機T1のＯ／Ｅ変換回路T11はフォトダ
イオードPD1および増幅器T111で構成されている。親機M
1のＣＬＫ生成回路M11は音声信号φ12が入力される角度
変調回路M12に接続され、角度変調回路M12は立ち上がち
微分回路M14、インバータM13を介して立ち下がり微分回
路M15に接続されている。立ち上がり微分回路M14はＥ／
Ｏ変換回路M16のＬＥＤ駆動回路M161を介して発光ダイ
オードLED11に接続され、立ち下がり微分回路M15はＥ／
Ｏ変換回路M16のＬＥＤ駆動回路M162を介して発光ダイ
オードLED12に接続されている。The E / O conversion circuit M16 of the master unit M1 is LE
D drive circuit M161, M162 and light emitting diode LED11, LED
The O / E conversion circuit T11 of the slave unit T1 includes a photodiode PD1 and an amplifier T111. Master unit M
The first CLK generation circuit M11 is connected to an angle modulation circuit M12 to which an audio signal φ12 is input, and the angle modulation circuit M12 is connected to a falling differentiation circuit M15 via a rising differentiation circuit M14 and an inverter M13. The rising differentiation circuit M14 is E /
It is connected to the light emitting diode LED11 via the LED drive circuit M161 of the O conversion circuit M16, and the falling differentiation circuit M15
It is connected to the light emitting diode LED12 via the LED drive circuit M162 of the O conversion circuit M16.
【００１２】子機T1のＯ／Ｅ変換回路T11はフォトダイ
オードPD1が増幅器T111に接続され、増幅器T111はコン
パレータT12、復調器T13を介してスピーカSP1に接続さ
れている。このように構成された赤外線信号伝送装置に
おいて、親機M1ではＣＬＫ生成回路M11から送出される
角度変調クロックφ11をキャリアとして角度変調回路M1
2で音声信号S11が角度変調（PWM変調）され、角度変調
信号φ12となる。角度変調回路M12からの角度変調信号
φ12は、一方を立ち上がり微分回路M14、他方をインバ
ータM13を介して立ち下がり微分回路M15へ入力され、そ
れぞれ立ち上がりおよび立ち下がりを検出し、デューテ
ィの小さいパルスに変換される。角度変調信号φ12の立
ち上がりを検出したパルスは、Ｅ／Ｏ変換回路M16のＬ
ＥＤ駆動回路M161および発光ダイオードLED11で電気信
号から赤外線φ13に変換され、角度変調信号φ12の立ち
下がり検出をしたパルスはＥ／Ｏ変換回路M16のＬＥＤ
駆動回路M162および発光ダイオードLED12で電気信号か
ら赤外線φ14に変換され、それぞれの赤外線φ13、φ14
は放出される。The O / E conversion circuit T11 of the slave unit T1 has a photodiode PD1 connected to an amplifier T111, and the amplifier T111 is connected to a speaker SP1 via a comparator T12 and a demodulator T13. In the infrared signal transmission device configured as described above, the master unit M1 uses the angle modulation clock φ11 sent from the CLK generation circuit M11 as a carrier to control the angle modulation circuit M1.
In step 2, the audio signal S11 is angle-modulated (PWM modulated) to become an angle-modulated signal φ12. One of the angle modulation signals φ12 from the angle modulation circuit M12 is input to the rising differentiation circuit M14 via the inverter M13, and the other is input to the falling differentiation circuit M15 via the inverter M13. Is done. The pulse that detects the rise of the angle modulation signal φ12 is applied to the L / E conversion circuit M16.
An electric signal is converted into an infrared ray φ13 by the ED drive circuit M161 and the light emitting diode LED11, and the pulse which detects the fall of the angle modulation signal φ12 is an LED of the E / O conversion circuit M16.
The driving circuit M162 and the light emitting diode LED12 convert the electric signal into infrared rays φ14, and the infrared rays φ13, φ14
Is released.
【００１３】この赤外線φ13、φ14は伝送空間中で加算
され、子機T1ではＯ／Ｅ変換回路T11のフォトダイオー
ドPD1および増幅器T111により赤外線φ13、φ14を電気
信号に変換する。Ｏ／Ｅ変換された電気信号はコンパレ
ータT12で出力レベルを調節され、電気信号φ15とな
る。復調器T13ではコンパレータT12からの電気信号φ15
を復調して角度変調信号φ12に復元し、復元された角度
変調信号φ16としてスピーカSP1に送出される。スピー
カSP1では、復元された角度変調信号φ16を音声信号S12
に復調し、出力する。The infrared rays φ13 and φ14 are added in the transmission space, and in the slave unit T1, the infrared rays φ13 and φ14 are converted into electric signals by the photodiode PD1 and the amplifier T111 of the O / E conversion circuit T11. The output level of the O / E-converted electric signal is adjusted by the comparator T12 to become an electric signal φ15. In the demodulator T13, the electric signal φ15 from the comparator T12
Is demodulated and restored to an angle modulation signal φ12, and is sent to the speaker SP1 as a restored angle modulation signal φ16. In the speaker SP1, the restored angle modulated signal φ16 is converted to the audio signal S12.
And demodulate to output.
【００１４】上記の一連の動作を図２に示すタイミング
チャートで説明する。図２において、Ｔ1は赤外線φ13
の立上がりパルスの間隔で角度変調信号φ12の周期と一
致し一定である。Ｔ2は赤外線φ13の立下がりパルスの
間隔で、PWM変調される音声信号S11の周波数ｆsがPWM変
調クロックφ11の周波数ｆcより小さければＴ2≒Ｔ1
（一定）となる。また、Ｔpはパルス幅でＴp／Ｔ1、Ｔp
／Ｔ2で与えられるデューティをほぼ一定に保つことが
できる。The above series of operations will be described with reference to a timing chart shown in FIG. In FIG. 2, T1 is an infrared ray φ13.
At the interval of the rising pulse, and coincides with the cycle of the angle modulation signal φ12 and is constant. T2 is the interval between the falling pulses of the infrared ray φ13. If the frequency fs of the PWM-modulated audio signal S11 is smaller than the frequency fc of the PWM modulation clock φ11, T2 ≒ T1
(Constant). Tp is a pulse width of Tp / T1, Tp
The duty given by / T2 can be kept almost constant.
【００１５】なお、上記の実施例では立上がり検出回
路、立ち下がり検出回路として微分回路を用いた場合に
ついて説明したが、他の立上がり検出回路であってもよ
い。また、上記の実施例ではベースバンドの音声信号を
変調信号に変調するのにPWM変調を使用したが、矩形波
のPMのような角度変調を用いることもでき、この場合、
復元された角度変調信号を音声信号に復調するための復
調器がスピーカとは別途に必要になる。In the above embodiment, the case where a differentiating circuit is used as the rise detection circuit and the fall detection circuit has been described. However, another rise detection circuit may be used. Further, in the above embodiment, the PWM modulation is used to modulate the baseband audio signal into the modulation signal. However, an angle modulation such as a rectangular wave PM can be used.
A demodulator for demodulating the restored angle-modulated signal into an audio signal is required separately from the speaker.
【００１６】[0016]
【発明の効果】以上の説明から明らかなように本発明に
よる赤外線信号伝送装置によれば、角度変調信号の立ち
上がりおよび立ち下がりを検出してデューティの小さい
パルスに変換した後、それぞれ別の発光ダイオードから
赤外線として伝送するため、発光ダイオードの光強度を
大きくすることができ、少ない発光ダイオードで赤外線
の伝送距離を大きくすることができる。As is apparent from the above description, according to the infrared signal transmitting apparatus of the present invention, the rising and falling edges of the angle modulation signal are detected and converted into pulses having a small duty, and then each of the light emitting diodes has a different duty ratio. Since the light is transmitted as infrared light, the light intensity of the light emitting diode can be increased, and the transmission distance of infrared light can be increased with a small number of light emitting diodes.
【図１】本発明による赤外線信号伝送装置の一実施例を
示す回路図。FIG. 1 is a circuit diagram showing an embodiment of an infrared signal transmission device according to the present invention.
【図２】本発明による赤外線信号伝送装置における動作
説明のタイミングチャート。FIG. 2 is a timing chart illustrating the operation of the infrared signal transmission device according to the present invention.
【図３】従来の赤外線信号伝送装置を示す回路図。FIG. 3 is a circuit diagram showing a conventional infrared signal transmission device.
S11・・・・・・音声信号 φ12・・・・・・角度変調信号 M12・・・・・・角度変調回路 M14・・・・・・立ち上がり微分回路 M15・・・・・・立ち下がり微分回路 φ13、φ14・・・・・・赤外線 M16・・・・・・Ｅ／Ｏ変換回路 T11・・・・・・Ｏ／Ｅ変換回路 T12・・・・・・コンパレータ φ15・・・・・・電気信号 T13・・・・・・復調器 S11: Voice signal φ12: Angle modulation signal M12: Angle modulation circuit M14: Rising differentiation circuit M15: Falling differentiation circuit φ13, φ14 Infrared M16 E / O conversion circuit T11 O / E conversion circuit T12 Comparator φ15 Electric Signal T13 ・ ・ ・ ・ ・ ・ Demodulator
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 10/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location H04B 10/00
Claims (1)
調信号（φ12）に変調する角度変調回路（M12）と、前
記角度変調信号の立ち上がりを検出する立ち上がり微分
回路（M14）と、前記角度変調信号の立ち下がりを検出
する立ち下がり微分回路（M15）と、前記立ち上がり微
分回路および前記立ち下がり微分回路からの電気信号を
赤外線（φ13、φ14）に変換するＥ／Ｏ変換回路（M1
6）と、Ｅ／Ｏ変換された前記赤外線を電気信号に変換
するＯ／Ｅ変換回路（T11）と、Ｏ／Ｅ変換された電気
信号の出力レベルを調節するコンパレータ（T12）と、
前記コンパレータからの電気信号（φ15）を前記角度変
調信号に復元する復調器（T13）とを有することを特徴
とする赤外線信号伝送装置。1. An angle modulation circuit (M12) for modulating a baseband audio signal (S11) into an angle modulation signal (φ12), a rise differentiation circuit (M14) for detecting a rise of the angle modulation signal, and the angle A falling differentiation circuit (M15) for detecting the falling of the modulation signal, and an E / O conversion circuit (M1) for converting electric signals from the rising differentiation circuit and the falling differentiation circuit into infrared rays (φ13, φ14).
6), an O / E conversion circuit (T11) for converting the E / O-converted infrared light into an electric signal, and a comparator (T12) for adjusting the output level of the O / E-converted electric signal.
A demodulator (T13) for restoring the electrical signal (φ15) from the comparator to the angle-modulated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8208327A JPH1056426A (en) | 1996-08-07 | 1996-08-07 | Infrared signal transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8208327A JPH1056426A (en) | 1996-08-07 | 1996-08-07 | Infrared signal transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1056426A true JPH1056426A (en) | 1998-02-24 |
Family
ID=16554437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8208327A Pending JPH1056426A (en) | 1996-08-07 | 1996-08-07 | Infrared signal transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1056426A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011004131A (en) * | 2009-06-18 | 2011-01-06 | Kyosan Electric Mfg Co Ltd | Drive controller, receiver and drive control method |
| US20220166509A1 (en) * | 2019-04-05 | 2022-05-26 | Ozyegin Universitesi | Optical data transmission system for swimmers |
-
1996
- 1996-08-07 JP JP8208327A patent/JPH1056426A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011004131A (en) * | 2009-06-18 | 2011-01-06 | Kyosan Electric Mfg Co Ltd | Drive controller, receiver and drive control method |
| US20220166509A1 (en) * | 2019-04-05 | 2022-05-26 | Ozyegin Universitesi | Optical data transmission system for swimmers |
| US11949451B2 (en) * | 2019-04-05 | 2024-04-02 | Ozyegin Universitesi | Optical data transmission system for swimmers |
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