Video signal transmission
First Claim
1. A video transmission system, comprising:
- a transmitter having;
an input arranged to receive a digital video signal having a frame rate and wherein the digital video signal has a resolution within a range of resolutions;
a detector configured to detect whether the resolution of the received digital video signal is in a lower resolution range or a higher resolution range;
a colour space converter configured to convert RGB video data into luminance video data and chrominance video data;
a compressor configured to compress luminance video data and chrominance video data of the received digital video signal by a constant compression ratio when the detector detects that the resolution of the received digital video signal is in the higher resolution range and wherein no compression is applied to video colour data of the received digital video signal when the detector detects that the resolution of the received digital video signal is in the lower resolution range; and
an output arranged to transmit frames of digital colour samples at the same frame rate as the frame rate of the received digital video signal; and
a receiver having;
an input arranged to receive frames of digital colour samples from the transmitter;
a detector configured to detect whether the received digital colour samples were transmitted in a compressed format or an uncompressed format;
an expander configured to expand the received compressed digital colour samples by a constant expansion ratio when the detector detects that the received digital colour samples were transmitted in a compressed format, and wherein no expansion is applied to the received digital colour samples when the detector determines that the received digital colour samples were transmitted in the uncompressed video format;
a colour space converter configured to convert luminance video data and chrominance video data from the expander into RGB video data; and
an output arranged to output a digital video signal with a resolution the same as the resolution of the digital video signal received at the input of the transmitter.
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0 Petitions
Accused Products
Abstract
A digital video signal has a frame rate and a resolution within a range of resolutions. If the resolution of the received digital video signal is in a lower resolution range then it is not compressed or if in a higher resolution range the video color data is compressed by a constant compression ratio. Frames of digital color samples are transmitted and frames of digital color samples are received at the same frame rate. The received compressed digital color samples are expanded by a constant expansion ratio when transmitted in a compressed format and not expanded if transmitted in the uncompressed video format. A digital video signal is output with a resolution the same as the resolution of the original digital video signal.
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Citations
30 Claims
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1. A video transmission system, comprising:
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a transmitter having; an input arranged to receive a digital video signal having a frame rate and wherein the digital video signal has a resolution within a range of resolutions; a detector configured to detect whether the resolution of the received digital video signal is in a lower resolution range or a higher resolution range; a colour space converter configured to convert RGB video data into luminance video data and chrominance video data; a compressor configured to compress luminance video data and chrominance video data of the received digital video signal by a constant compression ratio when the detector detects that the resolution of the received digital video signal is in the higher resolution range and wherein no compression is applied to video colour data of the received digital video signal when the detector detects that the resolution of the received digital video signal is in the lower resolution range; and an output arranged to transmit frames of digital colour samples at the same frame rate as the frame rate of the received digital video signal; and a receiver having; an input arranged to receive frames of digital colour samples from the transmitter; a detector configured to detect whether the received digital colour samples were transmitted in a compressed format or an uncompressed format; an expander configured to expand the received compressed digital colour samples by a constant expansion ratio when the detector detects that the received digital colour samples were transmitted in a compressed format, and wherein no expansion is applied to the received digital colour samples when the detector determines that the received digital colour samples were transmitted in the uncompressed video format; a colour space converter configured to convert luminance video data and chrominance video data from the expander into RGB video data; and an output arranged to output a digital video signal with a resolution the same as the resolution of the digital video signal received at the input of the transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A video transmission method, comprising:
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receiving a digital video signal having a frame rate at an input of a transmitter and wherein the digital video signal has a resolution within a range of resolutions; detecting whether the resolution of the received digital video signal is in a lower resolution range or a higher resolution range; compressing video colour data of the received digital video signal by a constant compression ratio when the resolution of the received digital video signal is detected to be in the higher resolution range and not compressing the video colour data of the received digital video signal when the resolution of the received digital video signal is detected to be in the lower resolution range; operating a switch in the transmitter to supply digital colour samples in the uncompressed format or to supply digital colour samples in the compressed format to an output of the transmitter; transmitting frames of digital colour samples from the output of the transmitter to an input of a receiver; receiving frames of digital colour samples at the input of the receiver at the same frame rate as the video signal were transmitted by the transmitter; detecting whether the received digital colour samples were transmitted in a compressed format or an uncompressed format; expanding the received compressed digital colour samples by a constant expansion ratio when it is detected that the received digital colour samples were transmitted in a compressed format and not expanding the received digital colour samples when it is detected that the received digital colour samples were transmitted in the uncompressed video format; operating a switch in the receiver to supply the digital video signal including digital colour data obtained from the digital colour samples in the uncompressed format or the digital video signal including digital colour data obtained from the digital colour samples in the compressed format to an output of the receiver; and outputting a digital video signal at the output of the receiver with a resolution the same as the resolution of the digital video signal received at the input of the transmitter. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A video transmission system, comprising:
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a transmitter having; an input arranged to receive a digital video signal having a frame rate and wherein the digital video signal has a resolution within a range of resolutions; a detector configured to detect whether the resolution of the received digital video signal is in a lower resolution range or a higher resolution range; a compressor configured to compress video colour data of the received digital video signal by a constant compression ratio when the detector detects that the resolution of the received digital video signal is in the higher resolution range and wherein no compression is applied to video colour data of the received digital video signal when the detector detects that the resolution of the received digital video signal is in the lower resolution range; an output arranged to transmit frames of digital colour samples at the same frame rate as the frame rate of the received digital video signal; and a switch operable by the detector either to supply the digital colour samples in the uncompressed format to the output of the transmitter or to supply the digital colour samples in the compressed format to the output of the transmitter; and a receiver having; an input arranged to receive frames of digital colour samples from the transmitter; a detector configured to detect whether the received digital colour samples were transmitted in a compressed format or an uncompressed format; an expander configured to expand the received compressed digital colour samples by a constant expansion ratio when the detector detects that the received digital colour samples were transmitted in a compressed format, and wherein no expansion is applied to the received digital colour samples when the detector determines that the received digital colour samples were transmitted in the uncompressed video format; an output arranged to output a digital video signal with a resolution the same as the resolution of the digital video signal received at the input of the transmitter; and a switch operable by the detector to supply the digital video signal including digital colour data obtained from the digital colour samples received in the uncompressed format to the output or to supply the digital video signal including digital colour data obtained from the digital colour samples transmitted in the compressed format.
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30. A video transmission system, comprising:
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a transmitter having; an input arranged to receive a digital video signal having a frame rate and wherein the digital video signal has a resolution within a range of resolutions; a detector configured to detect whether the resolution of the received digital video signal is in a lower resolution range or a higher resolution range; a compressor configured to compress video colour data of the received digital video signal by a constant compression ratio when the detector detects that the resolution of the received digital video signal is in the higher resolution range and wherein no compression is applied to video colour data of the received digital video signal when the detector detects that the resolution of the received digital video signal is in the lower resolution range; and an output arranged to transmit frames of digital colour samples at the same frame rate as the frame rate of the received digital video signal; and a receiver having; an input arranged to receive frames of digital colour samples from the transmitter; a detector configured to detect whether the received digital colour samples were transmitted in a compressed format or an uncompressed format; an expander configured to expand the received compressed digital colour samples by a constant expansion ratio when the detector detects that the received digital colour samples were transmitted in a compressed format, and wherein no expansion is applied to the received digital colour samples when the detector determines that the received digital colour samples were transmitted in the uncompressed video format; and an output arranged to output a digital video signal with a resolution the same as the resolution of the digital video signal received at the input of the transmitter, wherein the lower resolution range corresponds to a HDMI signal with a pixel clock frequency less than 165 MHz and the higher resolution range corresponds to a HDMI signal with a pixel clock frequency greater than 165 MHz, or wherein the lower resolution range corresponds to a DisplayPort signal with an aggregate negotiated data rate less than 5.4 Gb/s and the higher resolution range corresponds to a DisplayPort signal with an aggregate negotiated data rate more than 5.4 Gb/s.
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Specification