# US 8,572,668 B2 · Digital broadcasting signal displaying system and signal processing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,572,668 B2 - Document ID: US8572668B2 - Status: Granted - Kind: B2 - Application number: 13/164,570 - Filed: 2011-06-20 - Published: 2012-10-18 - Granted: 2013-10-29 - Earliest claimed: 2011-04-18 - Assignees: Skymedi Corporation - Applicants: Chin-Cheng Kao; Ching-Yao Yang; Chih-Ming Lin - Inventors: Chin-Cheng Kao; Ching-Yao Yang; Chih-Ming Lin - Web page: https://patentgrep.com/patent/US8572668B2 ## CPC - H04N 21/40: Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof - H04N 21/41: Structure of client; Structure of client peripherals - H04N 21/43632: {involving a wired protocol, e.g. IEEE 1394 (high-speed IEEE 1394 serial bus H04L12/40052)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A digital broadcasting signal processing method for processing a multimedia stream by a set-top box is disclosed. A USB request command set is pre-defined in a digital signal receiving unit to support the set-top box. The digital signal receiving unit transmits data with the set-top box and controls the signal quality of the data transmission according to the USB request commands transmitted by the set-top box while the digital signal receiving unit connected with the set-top box via USB. ## Claims ### Claim 1 A digital broadcasting signal displaying system, comprising: a digital signal receiving unit, comprising: an antenna module configured to receive a digital broadcasting signal; a demodulator configured to demodulate the digital broadcasting signal to generate a transport stream; and a USB transport device configured to receive USB request commands to output the transport stream; and a set-top box coupled to the digital signal receiving unit via USB interface to process and display the transport stream, and the set-top box comprises: a USB control unit configured to transmit USB request commands to the USB transport device and request the digital signal receiving unit to transmit the transport stream to the set-top box, wherein the USB control unit is configured to issue USB request commands to amend the analog-to-digital conversion gain of the digital signal receiving unit according to a signal-to-noise ratio of the digital signal receiving unit. ### Claim 2 (depends on 1) The system of claim 1, wherein the digital signal receiving unit further comprises a receiver, and the demodulator is configured to receive the digital broadcasting signal received by the antenna module via the receiver. ### Claim 3 (depends on 2) The system of claim 2, wherein the set-top box further comprises: a demultiplexer coupled to the USB control unit and configured to demultiplex the transport stream into a multimedia coding data of a TV program. ### Claim 4 (depends on 3) The system of claim 3, wherein the set-top box further comprises: a decoder coupled to the demultiplexer and configured to decode the multimedia coding data into a multimedia stream for display in connection with the TV program. ### Claim 5 (depends on 3) The system of claim 3, wherein the digital signal receiving unit further comprises a storage unit, and the USB control unit is configured to issue USB request commands to transmit the multimedia coding data in the storage unit. ### Claim 6 (depends on 4) The system of claim 4, wherein the USB control unit is configured to issue USB request commands periodically to read the signal-to-noise ratio (SNR) of the digital signal receiving unit. ### Claim 7 (depends on 1) The system of claim 1, wherein the digital broadcasting signal conforms to the standards of Digital Video Broadcasting-Terrestrial (DVB-T), Digital Video Broadcasting-Handheld (DVB-H), Digital Audio Broadcasting (DAB), Advanced Television Systems Committee (ATSC), and Integrated Services Digital Broadcasting (ISDB). ### Claim 8 A digital broadcasting signal processing method for displaying a multimedia stream by a set-top box, the method comprising: connecting a digital signal receiving unit to the set-top box via a USB transport device; initializing the set-top box and the digital signal receiving unit via the USB transport device; receiving a digital broadcasting signal by the digital signal receiving unit; and the set-top box issuing USB request commands to the digital signal receiving unit, so as to request transmission of data stored in the digital signal receiving unit to the set-top box, wherein the set-top box transmits USB request commands to amend the analog-to-digital conversion gain of the digital signal receiving unit according to a signal-to-noise ratio transmitted from the digital signal receiving unit. ### Claim 9 (depends on 8) The method of claim 8, wherein the set-top box issues USB request commands to transmit a transport stream by the digital signal receiving unit, and the method further comprises: the digital signal receiving unit demodulating the received digital broadcasting signal into the transport stream according to the USB request commands issued by the set-top box; and the digital signal receiving unit transmitting the demodulated transport stream to the set-top box via the USB transport device. ### Claim 10 (depends on 9) The method of claim 9, wherein the set-top box issues the USB request commands to request the digital signal receiving unit to transmit the signal-to-noise ratio, and the method further comprises: the digital signal receiving unit transmitting the signal-to-noise ratio to the set-top box via the USB transport device. ### Claim 11 (depends on 10) The method of claim 10, wherein the set-top box issues USB request commands periodically to request the digital signal receiving unit to transmit the signal-to-noise ratio. ### Claim 12 (depends on 11) The method of claim 11, wherein the set-top box uses firmware to initialize a software timer to provide an interrupt service routine, and the interrupt service routine issues the USB request commands periodically to request the digital signal receiving unit to transmit the signal-to-noise ratio, so as to amend the analog-to-digital conversion gain of the digital signal receiving unit according to the signal-to-noise ratio by issuing the USB request commands. ### Claim 13 (depends on 9) The method of claim 9, further comprising: the set-top box demultiplexing the transport stream into multimedia coding data of a TV program after receiving the transport stream. ### Claim 14 (depends on 13) The method of claim 13, further comprising: the set-top box decoding the multimedia coding data into a multimedia stream for display according to the TV program. ### Claim 15 (depends on 14) The method of claim 14, further comprising: the set-top box transmitting USB request commands to decode the multimedia coding data; and the multimedia coding data being sent to the digital signal receiving unit according to stored data. ### Claim 16 (depends on 8) The method of claim 8, wherein the digital broadcasting signal conforms to the standards of Digital Video Broadcasting-Terrestrial (DVB-T), Digital Video Broadcasting-Handheld (DVB-H), Digital Audio Broadcasting (DAB), Advanced Television Systems Committee (ATSC), and Integrated Services Digital Broadcasting (ISDB). ### Claim 17 A digital signal receiving unit for a digital broadcasting signal displaying system, the digital signal receiving unit being coupled to a set-top box via a USB interface, and comprising: an antenna module configured to receive a digital broadcasting signal; a receiver configured to receive the digital broadcasting signal by the antenna module; a demodulator coupled to the receiver and configured to demodulate the digital broadcasting signal to generate a transport stream; and a USB transport device having USB request commands for supporting the set-top box, the USB transport device being configured to transmit the transport stream to the set-top box and to amend the analog-to-digital conversion gain of the digital signal receiving unit according to a signal-to-noise ratio of the digital signal receiving unit after receiving USB request commands. ### Claim 18 (depends on 17) The unit of claim 17, wherein the USB transport device is configured to transmit the signal-to-noise ratio to the set-top box after receiving the USB request commands. ### Claim 19 (depends on 17) The unit of claim 17, wherein the USB transport device is configured to receive multimedia coding data transmitted by the set-top box after receiving the USB request commands. ### Claim 20 (depends on 19) The unit of claim 19, further comprising a storage unit which is used to store the multimedia coding data. ### Claim 21 (depends on 20) The unit of claim 20, wherein the USB transport device is configured to transmit the multimedia coding data stored in the storage unit to the set-top box. ### Claim 22 (depends on 17) The unit of claim 17, wherein the digital broadcasting signal conforms to the standards of Digital Video Broadcasting-Terrestrial (DVB-T), Digital Video Broadcasting-Handheld (DVB-H), Digital Audio Broadcasting (DAB), Advanced Television Systems Committee (ATSC), and Integrated Services Digital Broadcasting (ISDB).