Transmission system and transmitter
According to one embodiment, a transmission system includes a transmitter, and a receiver. The transmitter includes one or a plurality of light sources, a modulator, a first driver, a display, and a second driver. The one or a plurality of light sources is configured to emit a visible light whose light amount corresponds to a first drive signal. The modulator is configured to, according to transmission data to be transmitted from the transmitter to the receiver, modulate a first luminance signal indicative of an amount of the light the light source is configured to emit, to generate a second luminance signal. The first driver is configured to generate the first drive signal based on the second luminance signal. A mean of the second luminance signal during one frame in the input video signal is substantially equal to a value of the first luminance signal in the frame.
1. A transmission system comprising:
a transmitter: and
a receiver configured to receive a signal transmitted by the transmitter;
wherein the transmitter comprises:
one or a plurality of light sources configured to emit a visible light whose light amount corresponds to a first drive signal;
a modulator configured to, according to transmission data to be transmitted from the transmitter to the receiver, modulate a first luminance signal indicative of an amount of the light the light source is configured to emit, to generate a second luminance signal;
a first driver configured to generate the first drive signal based on the second luminance signal;
a display on which a video depending on a second drive signal using the visible light emitted by the light source; and
a second driver configured to generate the second drive signal based on an input video signal,
wherein a mean of the second luminance signal during one frame in the input video signal is substantially equal to a value of the first luminance signal in the frame, and
wherein the receiver comprises:
a light receiver configured to receive the video displayed on the display; and
a demodulator configured to demodulate the received video to reproduce the transmission data.
2. The system of claim 1 , wherein the modulator is configured to modulate the first luminance signal such that the transmission data is not recognized by human.
3. The system of claim 1 , wherein the modulator is configured to modulate the first luminance signal with a frequency which is not recognized by human.
4. The system of claim 1 , wherein the modulator is configured to modulate the first luminance signal with a frequency equal to or higher than 100 Hz.
5. The system of claim 1 , wherein the modulator is configured to:
according to first transmission data to be transmitted from the transmitter to the receiver, modulate the first luminance signal indicative of an amount of the light a first light source among the plurality of light sources is configured to emit, to generate the second luminance signal for the first light source; and
according to second transmission data to be transmitted from the transmitter to the receiver, modulate the first luminance signal indicative of an amount of the light a second light source among the plurality of light sources is configured to emit, to generate the second luminance signal for the second light source.
6. The system of claim 1 , wherein the demodulator is configured to demodulate the received video to reproduce the first luminance signal.
7. The system of claim 6 , wherein the demodulator is configured to reproduce the first luminance signal based on a mean of luminance of each frame of the received video.
8. A transmitter comprising:
one or a plurality of light sources configured to emit a visible light whose light amount corresponds to a first drive signal;
a modulator configured to, according to transmission data to be transmitted to a receiver, modulate a first luminance signal indicative of an amount of the light the light source is configured to emit, to generate a second luminance signal;
a first driver configured to generate the first drive signal based on the second luminance signal;
a display on which a video depending on a second drive signal using the visible light emitted by the light source; and
a second driver configured to generate the second drive signal based on an input video signal,
wherein a mean of the second luminance signal during one frame in the input video signal is substantially equal to a value of the first luminance signal in the frame.
9. The transmitter of claim 8 , wherein the modulator is configured to modulate the first luminance signal such that the transmission data is not recognized by human.
10. The transmitter of claim 8 , wherein the modulator is configured to modulate the first luminance signal with a frequency which is not recognized by human.
11. The transmitter of claim 8 , wherein the modulator is configured to:
according to first transmission data to be transmitted to the receiver, modulate the first luminance signal indicative of an amount of the light a first light source among the plurality of light sources is configured to emit, to generate the second luminance signal for the first light source; and
according to second transmission data to be transmitted to the receiver, modulate the first luminance signal indicative of an amount of the light a second light source among the plurality of light sources is configured to emit, to generate the second luminance signal for the second light source.
12. A transmission system comprising:
a transmitter: and
a receiver configured to receive a signal transmitted by the transmitter;
wherein the transmitter comprises:
one or a plurality of light sources configured to emit a visible light whose light amount corresponds to a first drive signal;
a first driver configured to generate the first drive signal based on a luminance signal indicative of an amount of the light the light source is configured to emit;
a display on which a video depending on a second drive signal using the visible light emitted by the light source;
a modulator configured to, according to transmission data to be transmitted from the transmitter to the receiver, modulate a first video signal indicative of a video configured to be displayed on the display, to generate a second video signal; and
a second driver configured to generate the second drive signal based on the second video signal,
wherein a mean of each pixel signal value in the second video signal during one frame in the first video signal is substantially equal to a corresponding pixel signal value in the frame in the first video signal;
wherein the receiver comprises:
a light receiver configured to receive the video displayed on the display; and
a demodulator configured to demodulate the received video to reproduce the transmission data.
13. The system of claim 12 , wherein the modulator is configured to modulate the first video signal such that the transmission data is not recognized by human.
14. The system of claim 12 , wherein the modulator is configured to modulate the first video signal with a frequency which is not recognized by human.
15. The system of claim 12 , wherein the modulator is configured to modulate the first video signal with a frequency equal to or higher than 100 Hz.
16. The system of claim 12 , wherein the demodulator is configured to demodulate the received video to reproduce the first video signal.
17. The system of claim 16 , wherein the demodulator is configured to reproduce the first video signal based on a mean of luminance of each frame of the received video.
18. A transmitter comprising:
one or a plurality of light sources configured to emit a visible light whose amount corresponds to a first drive signal;
a first driver configured to generate the first drive signal based on a luminance signal indicative of an amount of the light the light source is configured to emit;
a display on which a video depending on a second drive signal using the visible light emitted by the light source; and
a modulator configured to, according to transmission data to be transmitted to a receiver, modulate a first video signal indicative of a video configured to be displayed on the display, to generate a second video signal, to generate a second video signal; and
a second driver configured to generate the second drive signal based on the second video signal,
wherein a mean of each pixel signal value in the second video signal during one frame in the first video signal is substantially equal to a corresponding pixel signal value in the frame in the first video signal.
19. The transmitter of claim 18 , wherein the modulator is configured to modulate the first video signal such that the transmission data is not recognized by human.
20. The transmitter of claim 18 , wherein the modulator is configured to modulate the first video signal with a frequency which is not recognized by human.