Method and apparatus for reconstructing media

• US 6,661,793 B1
• Filed: 01/19/1999
• Issued: 12/09/2003
• Est. Priority Date: 01/19/1999
• Status: Expired due to Term

• Current Assignee: Hanger Solutions, LLC (IP Investments Group LLC)
• Original Assignee: VocalTec Communications Incorporated (B. Riley Financial, Inc.)
• Inventors: Pogrebinsky, Vladimir
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Boakye, Alexander O.
• Application Number:
  US09/233,012
• Time in Patent Office: 1,785 Days
• Field of Search: 370/216, 370/229, 370/235, 370/252, 370/350, 370/352, 370/354, 370/356, 370/389, 370/392, 370/394, 370/395.5, 370/395.3, 370/470, 370/474, 370/471, 370/476, 370/503, 370/510, 709/224, 714/758
• US Class Current: 370/394
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/6472 Internet
• CPC Class Codes: H04L 2012/6475 N-ISDN, Public Switched Telephone Network [PSTN]

Abstract

A method and apparatus for reconstructing media at a receiver from a media stream which includes a plurality of data packets wherein each data packet includes at least one media field. The media stream is monitored by a monitoring device and a packet pattern of the media stream is evaluated. An estimating device estimates a media time of at least one lost packet for reconstructing media by a reconstructing device at the receiver.

Claims

1. A method for reconstructing media at a receiver from a media stream which includes a plurality of data packets, wherein each data packet includes at least one media field, the method comprising the steps of:

monitoring said media stream by monitoring means of the receiver;

studying a media pattern of said media stream by processing means at the receiver;

estimating at least one media length of at least one lost packet by said processing means;

providing a sequence number to each packet of said media stream;

subtracting a sequence number of a previously received packet from a sequence number of a successive packet for calculating a number of packets which have been lost;

estimating said media length in accordance with a media pattern; and

reconstructing lost media information in accordance with lost media length.

2. A method for reconstructing media at a receiver from a media stream which includes a plurality of data packets, wherein each data packet includes at least one media field, the method comprising the steps of:

monitoring said media stream by monitoring means of the receiver;

studying a media pattern of said media stream by processing means at the receiver;

estimating at least one media parameter of at least one lost packet by said processing means;

estimating media time in accordance with a first virtually fixed media pattern for providing a first estimated media time;

estimating said media time in accordance with a second virtually fixed media pattern for providing a second estimated media time; and

selecting from said first and second estimated media time a media time with a maximum value for reconstructing lost media information of at least one lost packet at said receiver.

3. A method for reconstructing media at a receiver from a media stream which includes a plurality of data packets, wherein each packet includes at least one media field, the method comprising the steps of:

monitoring said media stream by monitoring means of the receiver;

studying a media pattern of said media stream by processing means at the receiver;

estimating at least one media parameter of at least one lost packet by said processing means; and

interpolating a first media frame information with a second media frame information for providing interpolated media information of the length of lost media at said receiver.

4. An apparatus for reconstructing media at a receiver from a media stream which includes a plurality of data packets, wherein each data packet includes at least one media field, the apparatus comprising:

a monitor device for monitoring said media stream;

a processing device for studying a media stream pattern, and for estimating a media length of at least one lost packet; and

a reconstructing device for reconstructing lost media information at said receiver;

wherein said processing device provides a sequence number to each packet of said stream;

subtracts a sequence number of a previous received packet from a sequence number of a successive packet for calculating the number of packets which are lost;

estimates said media length in accordance with said media pattern; and

said reconstructing device reconstructs the media in accordance with the number of packets which were lost.

5. An apparatus for reconstructing media at a receiver from a media stream which includes a plurality of data packets, wherein each data packet includes at least one media field, the apparatus comprising:

a monitor device for monitoring said media stream;

a processing device for studying a media stream pattern, and for estimating a media length of at least one lost packet; and

a reconstructing device for reconstructing lost media information at said receiver;

wherein said processing device estimates said media length in accordance with a first type of a media pattern for providing a first estimated media length;

estimates said media length in accordance with a second type of a media pattern for providing a second estimated media length; and

selects a media length with a maximum value between said first and second estimated media length for reconstructing the media of at least one lost packet.

6. An apparatus for reconstructing media at a receiver from a media stream which includes a plurality of data packets, wherein each data packet includes at least one media field, the apparatus comprising:

a monitor device for monitoring said media stream;

a processing device for studying a media stream pattern, and for estimating a media length of at least one lost packet; and

a reconstructing device for reconstructing lost media information at said receiver;

wherein said reconstructing device interpolates a first media frame information with a second media frame information for providing interpolated media information of the length of lost media.