Apparatus, system and method for synchronized playback of data transmitted over an asynchronous network

• US 20050166135A1
• Filed: 01/05/2005
• Published: 07/28/2005
• Est. Priority Date: 01/05/2004
• Status: Abandoned Application

• Current Assignee: Bryan C. Vanderwerff, Clayton C. Wahlquist, David G. Burke, Spencer Conley Kunzler, Steven C. Lingwall, Timothy J. Gunn
• Original Assignee: Bryan C. Vanderwerff, Clayton C. Wahlquist, David G. Burke, Spencer Conley Kunzler, Steven C. Lingwall, Timothy J. Gunn
• Inventors: Burke, David G., Wahlquist, Clayton C., Lingwall, Steven C., Vanderwerff, Bryan C., Gunn, Timothy J., Kunzler, Spencer Conley
• Application Number:
  US11/029,327
• Publication Number:
  US 20050166135A1
• Time in Patent Office: Days
• US Class Current: 715/203
• CPC Class Codes: G11B 27/10 Indexing; Addressing; Timing or synchronising; Measuring tape travel
• CPC Class Codes: H04L 12/2805 Home Audio Video Interoperability [HAVI] networks
• CPC Class Codes: H04L 2012/2843 Mains power line
• CPC Class Codes: H04L 2012/2849 Audio/video appliances
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04N 21/23406 involving management of server-side video buffer
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/4302 Content synchronisation processes, e.g. decoder synchronisation
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/44004 involving video buffer management, e.g. video decoder buffer or video display buffer
• CPC Class Codes: H04N 21/6543 for forcing some client operations, e.g. recording remote booting in general G06F9/4416

Abstract

An apparatus, system and method for synchronizing the playback of data transmitted over an asynchronous network. An initialization module may initialize at least two receivers to receive playback data from a transmission module. The transmission module may then transmit to the receivers the playback data, and, in some embodiments, synchronization data. Synchronization data may include a playback indicator by which the receivers may determine an appropriate playback data consumption rate. A buffer module may buffer a predetermined amount of playback data which may be played in response to a start signal individually addressed to the receivers.

Claims

1. An apparatus for the synchronized playback of data transmitted over an asynchronous network, comprising:

an initialization module for initializing at least two receivers;

a transmission module for transmitting over an asynchronous network playback data to the at least two receivers;

a receiver module comprising a buffer module for buffering a predetermined amount of playback data at the at least two receivers; and

a playback module for playing the playback data in response to a start signal individually addressed to the at least two receivers.

2. The apparatus of claim 1, further comprising a determination module for determining at each of the at least two receivers a playback data consumption rate based on a playback indicator provided by the transmission module.

3. The apparatus of claim 2, wherein the playback indicator is selected from the group consisting of a playback bit and a playback time stamp.

4. The apparatus of claim 1, wherein the receiver module further comprises:

a detection module for detecting a difference in playback data consumption rates between the at least two receivers; and

a compensation module for compensating for the difference in playback data consumption rates between the at least two receivers.

5. The apparatus of claim 4, wherein the compensation module replaces missing playback data with pseudo data packets.

6. The apparatus of claim 4, wherein the compensation module adjusts the playback data consumption rate for at least one of the receivers.

7. The apparatus of claim 1, wherein the initialization module synchronizes real-time clocks corresponding to the at least two receivers with a reference clock.

8. The apparatus of claim 1, wherein the transmission module further transmits over the asynchronous network a synchronization data packet to maintain synchronization between the at least two receivers over time.

9. The apparatus of claim 8, wherein the transmission module intersperses the synchronization data packet between playback data packets transmitted over the asynchronous network.

10. The apparatus of claim 8, wherein the transmission module periodically transmits the synchronization data packet at predetermined time intervals.

11. A system for the synchronized playback of data transmitted over an asynchronous power line network, comprising:

a transmitter adapted to transmit playback data;

at least two receivers adapted to receive the playback data and to play the playback data in response to a start signal individually addressed to each of the at least two receivers;

a network operatively connecting the transmitter to the at least two receivers and adapted to carry the playback data; and

a playback device coupled to each receiver and configured to synchronously present the playback data to a user.

12. The system of claim 11, wherein each of the at least two receivers comprises a determination module for determining a playback data consumption rate based on a playback indicator provided by the transmitter.

13. The system of claim 12, wherein the playback indicator is selected from the group consisting of a playback bit and a playback time stamp.

14. The system of claim 11, wherein each of the at least two receivers further comprises a detection module to detect a difference in a playback data consumption rate between the transmitter and each of the at least two receivers.

15. The system of claim 14, wherein each of the at least two receivers further comprises a compensation module to accelerate the playback consumption rate of a receiver to compensate for the difference in playback data consumption rates between the at least two receivers.

16. A signal bearing medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform operations for the synchronized playback of data transmitted over an asynchronous network, the operations comprising:

an operation to initialize at least two receivers;

an operation to transmit playback data over an asynchronous network from a transmission module to the at least two receivers;

an operation to buffer a predetermined amount of playback data at the at least two receivers; and

an operation to play the playback data in response to a start signal individually addressed to each of the at least two receivers.

17. The signal bearing medium of claim 16, further comprising an operation to determine at each of the at least two receivers a playback data consumption rate based on a playback indicator provided by the transmission module.

18. The signal bearing medium of claim 17, wherein the playback indicator is selected from the group consisting of a playback bit and a playback time stamp.

19. The signal bearing medium of claim 16, further comprising:

an operation to detect a difference in a playback data consumption rate between the at least two receivers; and

an operation to compensate for the difference in the playback data consumption rates.

20. The signal bearing medium of claim 19, wherein the operation to compensate comprises replacing missing playback data packets with pseudo data packets.