JPS63267086A - Space transmitting method for optically converted video and sound signals - Google Patents

Abstract

PURPOSE:To prevent a noise generated in a transmission through a radio wave or a cable without receiving the regulation of a radio wave rule by transforming a video and sound signal to an optical signal and space transmitting. CONSTITUTION:A composite signal N is separated to a luminance signal and a chrominance signal in a dividing circuit 1, the luminance signal is modulated to an FM modulated luminance signal in a luminance signal modulation processing system 2 and the chrominance signal is transformed to a frequency fc lower than the FM modulated luminance signal in a chrominance signal processing system 3. On the sound signal, the sound signals A1, A2 of two channels are modulated to FM modulated signals in the carriers fA1, fA2 of different frequencies by FM modulation circuits 4, 5 in a frequency band between the FM modulated luminance signal and the low frequency transformed chrominance signal. Then, these four signals are mixed, amplified in a mixing and amplifying circuit 6, inputted to an LED driving circuit 7 to drive an LED 8, transformed to the optical signal and space transmitted. Thereby, the regulation of the radio wave rule is not received in a light transmission output and transmission band but the noise generated in the transmission through the radio wave or the cable is prevented and a labor in wiring at the time of transmitting through the cable can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for transmitting video and audio in an optical space using infrared rays.

2. Description of the Related Art Conventionally, when transmitting video and audio signals, methods such as radio waves and cables have been used.

Hereinafter, the conventional transmission method as described above will be explained with reference to the drawings. FIGS. 2 and 3 show a conventional transmission method. In FIG. 2, space transmission is performed by radio waves from a transmitter 17 through a transmitting antenna 18,
The signal is received by the receiver 20 through the receiving antenna 19, or as shown in FIG. 3, it is transmitted from the transmitter f1!21 to the receiver@23 through the cable 22.

Problems to be Solved by the Invention However, when transmitting radio waves as shown in Figure 2, there are regulations under the Radio Law regarding the transmission output and transmission band.

It is also affected by electromagnetic noise. Furthermore, even the transmission using the cable shown in FIG. 3 requires wiring and has problems such as noise entering the cable.

In order to solve the above-mentioned problems, the present invention provides a video and audio optical spatial transmission method for converting video and audio signals into optical signals and transmitting the optical signals in space.

Means for Solving the Problems The video and audio optical space transmission method of the present invention provides video and audio optical space transmission on the light transmitting side.
The synthesized audio signal is converted into an optical signal, transmitted through space, received on the light receiving side, and converted into an electrical signal to obtain the original video and audio signals.

Function: Since the video and audio optical spatial transmission method of the present invention converts video and audio signals into optical signals and transmits them through space, the transmitted light output and transmission band are not subject to regulations under the Radio Law, and are not subject to radio wave or cable transmission. No noise is generated. It also eliminates the hassle of wiring when transmitting via cable.

Embodiment Hereinafter, a video and audio optical space transmission method according to an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1a is a block diagram of the light transmitting side in the embodiment of the present invention, FIG. , is a block diagram of the light receiving side.

In Fig. 1a, as for the video signal, the composite signal V is separated into a luminance signal and a color signal by a demultiplexing circuit 1, and the luminance signal is processed by a luminance signal demodulation processing system 2 to convert the white level and the carrier frequency in the horizontal synchronization signal to frvt. *fYH is an FM modulated luminance signal. Also, the color signal is processed by color signal processing system 3, F
The M-modulated luminance signal is also converted to a lower frequency fc.

Regarding the audio signal, two channels of audio signal 1. The FM modulation circuit 4.5 converts the FM 2 into an FM modulated signal using a carrier wave FM1+ZA2 of a different frequency in a frequency band between the FM modulated luminance signal and the low frequency conversion color signal.

Then, the above four signals are mixed in a mixing/amplifying circuit 6.

Amplify this composite signal and input it to the LID drive circuit 7.
It drives the IED 8, converts it into an optical signal, and transmits it spatially.

On the light receiving side, as shown in FIG.
FM modulation luminance signal and low-frequency conversion color signal are respectively tuned and amplified by the 1-wavelength division circuit 11.

Separates into FM modulated audio signals. Regarding video signals・F
The M-modulated luminance signal is demodulated by a luminance signal demodulation processing system 12, and the low frequency converted color signal is converted to a color carrier frequency by a color signal processing system 13, and mixed by a mixing circuit 14 to obtain the original composite signal V.

Regarding audio signals, FM modulated audio signals are
Demodulation circuits 15 and 16 demodulate the original audio signal 4. Get 2.

As described above, the video and audio optical space transmission method of this embodiment is as follows.
For example, since the video and audio recording method used in home video tape recorders can be applied, the electrical circuit can be applied as is, and LEDs and photodiodes do not require expensive fast-response devices. It can be transmitted in the band.

Effects of the Invention As described above, the video and audio optical space transmission method of the present invention has the following effects:
In order to convert video and audio signals into optical signals and transmit them spatially,
The optical output and transmission band are not regulated by the Radio Law, and there is no noise that occurs with transmission via radio waves or cables. Furthermore, it is practically advantageous in that it saves the trouble of wiring during cable transmission.

[Brief explanation of the drawing]

Figure 1a is a block diagram of the light transmitting side in a video and audio optical space transmission method according to an embodiment of the present invention;
Figure I is a characteristic diagram showing the spectrum of the video and audio synthesis signals input to the ICD drive circuit, C is a block diagram of the light receiving side, and Figure 2 is a block diagram showing the conventional method of transmitting video and audio signals using radio waves. , FIG. 3 is a block diagram showing a conventional method of transmitting video and audio signals using cables. 1...Bunch circuit, 2...Brightness signal modulation processing system. 3... Color signal processing system, 4... FM modulation circuit, 6... FM modulation, 6... Mixing,
Amplifier circuit, 7... LIED drive circuit, 8...
...LED, 9...Photodiode, 1o
... Tuning, amplification circuit, 11 ... Branching circuit, 12 ... Luminance signal demodulation processing system, 13 ...
...Color signal processing system, 14...Mixing circuit, 16
...FM demodulation circuit, 16...FM demodulation circuit. Figure 1 (Ku) Figure 1 Figure 2 Figure 3 / 7 --- Remaining Sending / δ --- Transmitting Antenna / 9 - 11-Uke 1 Color Antenna 20- 11-Uke Foam Match 21 - - 1 Foaming Iso 22-m-Cable 23-11 Uke and other Iso

Claims (1)

[Claims] On the light transmitting side, the composite signal is separated into a brightness signal and a color signal, the brightness signal is an FM modulated signal, and the color signal is
This FM modulated luminance signal is converted to a lower frequency band than the above-mentioned FM luminance signal, and two channels of audio signals are input as FM modulated signals in the frequency band between these two signals, each using a carrier wave of a different frequency, and these combined signals are converted. A video/audio optical spatial transmission method in which the optical signal is converted into an optical signal and transmitted through space, and on the receiving side, the optical signal is received and converted into an electrical signal, and then the original composite signal and audio signal are obtained through each demodulation system.