PACKET TIMING METHOD AND APPARATUS OF A RECEIVER SYSTEM FOR CONTROLLING DIGITAL TV PROGRAM START TIME

• US 20100011397A1
• Filed: 09/17/2009
• Published: 01/14/2010
• Est. Priority Date: 12/27/2001
• Status: Active Grant

• Current Assignee: ARRIS Solutions, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: GoBackTV, Inc. (CommScope Holding Company, Inc.)
• Inventors: Field, Michael, Lin, Xu Duan, Pickens, John, Baran, Paul
• Granted Patent: US 8,191,101 B2
• Time in Patent Office: Days
• US Class Current: 725/90
• CPC Class Codes: H04L 63/068 using time-dependent keys, e.g. periodically changing keys cryptographic mechanisms or cryptographic arrangements for controlling usage of secret information H04L9/088
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04N 21/2318 using striping
• CPC Class Codes: H04N 21/2326 Scheduling disk or memory reading operations
• CPC Class Codes: H04N 21/23406 involving management of server-side video buffer
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2365 Multiplexing of several video streams
• CPC Class Codes: H04N 21/26606 for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/47202 for requesting content on demand, e.g. video on demand
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/6587 Control parameters, e.g. trick play commands, viewpoint selection
• CPC Class Codes: H04N 7/17318 Direct or substantially direct transmission and handling of requests
• CPC Class Codes: H05K 1/0275 Security details, e.g. tampering prevention or detection
• CPC Class Codes: H05K 1/144 Stacked arrangements of planar printed circuit boards
• CPC Class Codes: H05K 1/185 Components encapsulated in the insulating substrate of the printed circuit or incorporated in internal layers of a multilayer circuit semiconductor chips encapsulated by interconnect and support structures H01L23/5389, H01L24/00
• CPC Class Codes: H05K 2201/10151 Sensor

Abstract

A system for the delivery of video on demand (VOD). A wireless remote control device generates keystroke signals for controlling a TV display and has a single button for restarting a selected program at a beginning of the selected program. A head-end unit supports separate downstream virtual channels for each separate TV set connected on a common TV feeder-cable; The head-end unit locally records and stores many programs, and transmits each program using a compressed digital format. The Compressed digital format may use MPEG-2 or MPEG-4. The head-end unit has means for protecting against signal theft. A set top unit encapsulates the keystroke signals and transmits the keystroke signals via a two-way channel to the head-end unit.

Claims

1. A method of producing low-cost video storage and delivery system that manages jitter in a cost effective manner, the method including:

at a storage unit,

receiving a plurality of Ethernet encapsulated MPEG transport packets, recording arrival times, and storing the Ethernet encapsulated packets;

retrieving the Ethernet encapsulated packets and sending the Ethernet encapsulated packets to an EdgeQAM unit at times based on the recorded arrival times;

at the EdgeQAM unit,

receiving the Ethernet encapsulated packets, buffering at least the MPEG transport packets, and finding in the MPEG transport packets a plurality of PCR time stamps;

using a first reference clock of the EdgeQAM, scheduling the MPEG transport packets for transmission at times relative to the PCR time stamps and the first reference clock, without recovering an encoder clock used to generate the PCR time stamps; and

transmitting the MPEG transport packets via a QAM channel to a receiving device.

2. The method of the preceding claim, further including transcoding the PCR time stamps from a first time base of the encoder clock that operated at a first frequency to the second time base of a second reference clock operates at a second frequency that is substantially different from the first frequency and that matches a frequency requirement of the QAM channel.

3. The method of claim 1, wherein said storage unit receives said transport streams via a Gigabit Ethernet interface.

4. The method of claim 1, wherein said EdgeQAM unit includes receiving single program transport streams and generating multi program transport stream.

5. The method of claim 1, wherein said EdgeQAM unit can provide up to 128 QAM channels.

6. The method of claim 1, wherein the received Ethernet encapsulated packets arrive asynchronously at the EdgeQAM unit.

7. The method of claim 1, wherein the PCR time stamped transport packets are synchronously sent out of the said EdgeQAM unit to said receiving device.

8. A system for managing jitter in a cost effective manner and producing low-cost video storage and delivery of program data, that operates on MPEG transport packets from in which an encoder has occasionally inserted a program clock reference (PCR) timing field, the system including:

a storage unit including

at least one processor,

a storage medium coupled to the processor,

a receive-and-store module running on the processor adapted to

record times of arrival of a plurality of Ethernet encapsulated MPEG transport packets, and

store the Ethernet encapsulated packets to and from the storage medium,

an Ethernet adapter coupled to the processor, and

a retrieve-and-send module running on the processor adapted to

retrieve the Ethernet encapsulated packets, and

to transmit the retrieved Ethernet encapsulated packets across the Ethernet adapter at times based on the recorded times of arrival;

an EdgeQAM unit including

at least one processor,

a packet buffer coupled to the processor,

an Ethernet adapter coupled to the processor and in communication with the storage unit to receive the Ethernet encapsulated packets,

a QAM transceiver coupled to the processor and to a network,

a packet scheduler module running on the processor adapted to

find PCR time stamps in the MPEG transport packets within the Ethernet encapsulated packets, and

to transmit the MPEG transport packets across the QAM transceiver at times corresponding to the PCR time stamps.

9. The system of claim 8, wherein the EdgeQAM further includes a transcoder coupled to the processor that adjusts the PCR time stamps from a first time base corresponding to an encoder that applied the PCR time stamps to a second time base corresponding to a frequency at which the QAM transceiver operates.

10. The system of claim 8, wherein the EdgeQAM further includes a multiplexer that combines a plurality of single program transport streams into one or more MPEG multi program transport streams.