# US 2004/0071218 A1 · Digital video system and control method threreof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2004/0071218 A1 - Document ID: US20040071218A1 - Status: Published application - Kind: A1 - Application number: 10/622,798 - Filed: 2003-07-21 - Published: 2004-04-15 - Earliest claimed: 2002-07-19 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Young-Joo Seo - Web page: https://patentgrep.com/patent/US20040071218A1 ## CPC - H04N 21/4621: {Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen (arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10)} - H04N 21/4126: {The peripheral being portable, e.g. PDAs or mobile phones} - H04N 21/4341: {Demultiplexing of audio and video streams} - H04N 21/43637: {involving a wireless protocol, e.g. Bluetooth®, RF or wireless LAN [IEEE 802.11] (arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114)} - H04N 21/440218: {by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 (conversion of standards in analogue television systems H04N7/01)} - H04N 21/44209: {Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network (arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A digital video system for wirelessly transmitting a signal to a display device, including a receiver that analyzes a packet of the signal wirelessly received through a first transmitting/receiving unit to check the transmission error rate. The receiver externally sends out a grade adjustment request signal requesting up-adjustment or down-adjustment of a resolution grade of the signal through the first: transmitting/receiving unit, based on the checked transmission error rate and a resolution grade of the currently received signal. A transmitter converts the signal to be transmitted to the receiver into a signal that corresponds to the grade adjustment request signal of the receiver, and wirelessly transmits the converted signal through a second transmitting/receiving unit corresponding to the first transmitting/receiving unit. The digital video system adjusts the grade of the signals to be transmitted based on changes in the wireless communication environment, to maintain the signal transmission rate within a range. ## Claims ### Claim 1 A digital video system for adjusting a grade of a wirelessly transmitted signal, comprising: a receiver that analyzes a packet of the wirelessly transmitted signal, wirelessly received from a first transmitting/receiving unit, to check the transmission error rate thereof, and outputs a grade adjustment request signal requesting one of an up-adjustment and a down-adjustment of a resolution grade of the signal to the first transmitting/receiving unit in accordance with the checked transmission error rate and a current resolution grade of the current received wirelessly transmitted signal; and a transmitter that converts the wirelessly transmitted signal to be transmitted to the receiver into another wirelessly transmitted signal corresponding to the grade adjustment request signal of the receiver, and wirelessly transmits the converted signal through a second transmitting/receiving unit to the first transmitting/receiving unit. ### Claim 2 (depends on 1) The system of claim 1, wherein the receiver comprises: a MPEG decoder that checks the transmission error rate while decoding the wirelessly transmitted signal received from the first transmitting/receiving unit and outputs the checked transmission error rate; and a control unit that outputs to the transmitter said grade adjustment request signal requesting said down-adjustment when the transmission error rate output from the MPEG decoder is greater than a reference value and a grade lower than the current resolution grade of the current received signal exists. ### Claim 3 (depends on 1) The system of claim 1, wherein the transmitter comprises: a tuner that receives an external signal from a reception device, and determines whether the external signal is analog or digital; a channel decoder that decodes said received signal when said received signal is digital, and generates a channel decoder output to a control unit in response to a first control input received from said control unit; an analog decoder that decodes said received signal when said received signal is analog, and generates a first analog decoder output, and generates a second analog decoder output to a multi-sound processor that generates an audio output; a selector that receives said first analog decoder output and said audio output and generates a video signal and an audio signal based on a second control input received from said control unit, said selector being configured to receive an external data input; an analog-to-digital converter that converts said video signal and said audio signal from analog to digital format, and sends said converted video signal and said converted audio signal to an encoder that outputs an encoded signal to said control unit; and the second transmitting/receiving unit outputting one of said channel decoder output and said encoded signal to said receiver as the wirelessly transmitted signal, and receiving said grade adjustment request signal. ### Claim 4 (depends on 2) The system of claim 2, wherein the control unit outputs to the transmitter said grade adjustment request signal requesting said up-adjustment when the transmission error rate output from the MPEG decoder is less than a reference value and a grade higher than the current resolution grade of the current received signal exists. ### Claim 5 (depends on 2) The system of claim 2, wherein the receiver further comprises: a display unit that receives a video output of the MPEG decoder for a user to view; and an audio decoder that receives an audio output of the MPEG decoder, and generates a decoded audio output to a speaker for said user to hear. ### Claim 6 A method of controlling a wirelessly transmitted signal processed by a receiver and received from a transmitter, comprising the steps of: checking a transmission error rate of a packet of the wirelessly transmitted signal received from the transmitter; and transmitting a down-adjustment request signal to the transmitter with respect to a grade of the wirelessly transmitted signal when the transmission error rate is greater than a reference value, and when the wirelessly transmitted signal can be adjusted down to a grade lower than the resolution grade of the received signal. ### Claim 7 (depends on 6) The method of claim 6, further comprising: determining whether said transmission error rate is within a range of values; and performing said transmitting and receiving when said transmission error rate is not within said range. ### Claim 8 (depends on 6) The method of claim 6, further comprising: receiving the down-adjustment request signal, converting the wirelessly transmitted signal to be transmitted into a format that corresponds to a revised signal having a grade lower than the resolution grade of the signal, and transmitting the converted signal to the receiver. ### Claim 9 (depends on 6) The method of claim 6, further comprising: transmitting an up-adjustment request signal to the transmitter with respect to a grade of the wirelessly transmitted signal when the transmission error rate is less than a reference value, and when the wirelessly transmitted signal can be adjusted up to a grade greater than the resolution grade of the signal; and receiving the up-adjustment request signal, converting the wirelessly transmitted signal to be transmitted into a format that corresponds to a revised signal having a grade higher than the resolution grade of the wirelessly transmitted signal, and transmitting the converted signal to the receiver. ### Claim 10 A method of controlling a digital video system comprising a transmitter that wirelessly outputs a wirelessly transmitted signal to be transmitted, and a receiver that wirelessly communicates with the transmitter, and processes the signal received from the transmitter, the method comprising the steps of: the receiver, checking a transmission error rate of a packet of the wirelessly transmitted signal received from the transmitter; transmitting a down-adjustment request signal to the: transmitter with respect to a grade of the wirelessly transmitted signal when the transmission error rate is greater than a reference value, and when the wirelessly transmitted signal can be adjusted down to a grade lower than the resolution grade of the video signal; and the transmitter, receiving the down-adjustment request signal, converting the wirelessly transmitted signal to be transmitted into a format that corresponds to a revised signal having a grade lower than the resolution grade of the wirelessly transmitted signal, and transmitting the converted signal to the receiver. ### Claim 11 (depends on 10) The method of claim 10, further comprising: transmitting an up-adjustment request signal to the transmitter with respect to a grade of the wirelessly transmitted signal when the transmission error rate is less than a reference value, and when the wirelessly transmitted signal can be adjusted up to a grade greater than the resolution grade of the wirelessly transmitted signal; and the transmitter, receiving the up-adjustment request signal, converting the wirelessly transmitted signal to be transmitted into a format that corresponds to a revised signal having a grade higher than the resolution grade of the signal, and transmitting the converted signal to the receiver. ### Claim 12 (depends on 10) The method of claim 10, further comprising: determining whether said transmission error rate is within a range of values; and performing said transmitting and receiving when said transmission error rate is not within said range. ### Claim 13 A computer readable medium containing instructions for controlling a video display system, said instructions comprising: checking a transmission error rate of a packet of the signal received from the transmitter; transmitting a down-adjustment request signal to the transmitter with respect to a grade of the signal when the transmission error rate is greater than a reference value, and when the signal can be adjusted down to a grade lower than the resolution grade of the received signal; and receiving the down-adjustment request signal, converting the signal to be transmitted into a format that corresponds to a revised signal having a grade lower than the resolution grade of the signal, and transmitting the converted signal to the receiver. ### Claim 14 (depends on 13) The computer-readable medium of claim 13, further comprising the instructions of: transmitting an up-adjustment request signal to the transmitter with respect to a grade of the signal when the transmission error rate is less than a reference value, and when the signal can be adjusted up to a grade greater than the resolution grade of the signal; and receiving the up-adjustment request signal, converting the signal to be transmitted into a format that corresponds to a revised signal having a grade higher than the resolution grade of the signal and transmitting the converted signal to the receiver. ### Claim 15 An apparatus for adjusting a grade of a wirelessly transmitted signal, comprising: a transmitter that receives an external telecommunication signal, and outputs an image signal; and a receiver that wirelessly receives said image signal and generates display for a user, wherein a feedback signal is provided to said transmitter when a transmission error rate is not within a reference range, and said transmitter alters a grade of transmission of said image signal in response to said feedback signal. ### Claim 16 (depends on 15) The apparatus of claim 15, said transmitter comprising: a tuner that receives the external telecommunication signal from a reception device, and determines whether the external telecommunication signal is analog or digital; a channel decoder that decodes said received signal when said received signal is digital, and generates a channel decoder output to a control unit in response to a first control input received from said control unit; an analog decoder that decodes said received signal when said received signal is analog, and generates a first analog decoder output, and generates a second analog decoder output to a multi-sound processor that generates an audio output; a selector that receives said first analog decoder output and said audio output and generates a video signal and an audio signal based on a second control input received from said control unit, said selector being configured to receive an external input; an analog-to-digital converter that converts said video signal and said audio signal from analog to digital format, and sends said converted video signal and said converted audio signal to an encoder that outputs an encoded signal to said control unit; and a transmitting/receiving unit outputting one of said channel decoder output and said encoded signal to said receiver, and receiving said grade adjustment request signal. ### Claim 17 (depends on 15) The apparatus of claim 15, said receiver comprising: a MPEG decoder that checks the transmission error rate while decoding the signal received from a transmitting/receiving unit and outputs the checked transmission error rate; and a control unit that outputs to the transmitter said feedback signal requesting down-adjustment when the transmission error rate output from the MPEG decoder is greater than a reference value and a grade lower than the current resolution grade of the current received signal exists. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the control unit outputs to the transmitter said feedback signal requesting up-adjustment when the transmission error rate output from the MPEG decoder is outside the reference range and a grade higher than a resolution grade of the image signal exists. ### Claim 19 (depends on 17) The apparatus of claim 17, said receiver further comprising: a display unit that receives a video output of the MPEG decoder for a user to view; and an audio decoder that receives an audio output of the MPEG decoder, and generates a decoded audio output to a speaker for said user to hear. ### Claim 20 (depends on 18) The apparatus of claim 18, said receiver further comprising: a display unit that receives a video output of the MPEG decoder for a user to view; and an audio decoder that receives an audio output of the MPEG decoder, and generates a decoded audio output to a speaker for said user to hear.