Passive system and method for measuring and monitoring the quality of service in a communications network
First Claim
1. A method for determining perceptual quality of a received encoded framed signal, comprising the following steps:
- copying said received encoded framed signal to obtain a copied encoded framed signal;
determining a framing technique used for framing said received encoded framed signal;
determining an encoding technique used for encoding said received encoded framed signal;
encoding a known media signal with said encoding technique used for encoding said received encoded framed signal to produce a known encoded signal;
framing said known encoded signal with said framing technique used for framing said received encoded framed signal to produce a known encoded framed signal;
replacing content of said copied encoded framed signal with content of said known encoded framed signal to produce a pseudo-encoded framed signal;
determining a perceptual quality of said pseudo-encoded framed signal; and
using said perceptual quality of said pseudo-encoded framed signal to generate a perceptual quality of said received encoded framed signal.
5 Assignments
0 Petitions
Accused Products
Abstract
In accordance with the present invention, a portion of a received media stream is copied from a data network without interfering with the flow of the data in the network. A known test signal is then substituted for the information contained in the copied portion of the media stream to prepare a pseudo-media stream. The known test signal is encoded, and packetized if necessary, using the same methods used for the received media stream. A pseudo-media signal is then recovered from the pseudo-media stream using the same depacketizing and decoding methods to be used on the received media stream. The recovered signal is an accurate representation of the state of the received media stream since it has gone through the same packetization/depacketization and encoding/decoding procedures, and it includes all of the same faults of the copied media stream. The perceptual quality of the recovered signal is then measured, providing an accurate measure of the perceptual quality of the copied media stream. The method may be applied to packetized as well as non-packetized voice signals.
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Citations
36 Claims
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1. A method for determining perceptual quality of a received encoded framed signal, comprising the following steps:
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copying said received encoded framed signal to obtain a copied encoded framed signal; determining a framing technique used for framing said received encoded framed signal; determining an encoding technique used for encoding said received encoded framed signal; encoding a known media signal with said encoding technique used for encoding said received encoded framed signal to produce a known encoded signal; framing said known encoded signal with said framing technique used for framing said received encoded framed signal to produce a known encoded framed signal; replacing content of said copied encoded framed signal with content of said known encoded framed signal to produce a pseudo-encoded framed signal; determining a perceptual quality of said pseudo-encoded framed signal; and using said perceptual quality of said pseudo-encoded framed signal to generate a perceptual quality of said received encoded framed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining perceptual quality of a received encoded framed signal, comprising:
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means for copying said received encoded framed signal to obtain a copied encoded framed signal; means for determining a framing technique used for framing said received encoded framed signal; means for determining an encoding technique used for encoding said received encoded framed signal; means for encoding a known media signal with said encoding technique used for encoding said received encoded framed signal to produce a known encoded signal; means for framing said known encoded signal with said framing technique used for framing said received encoded framed signal to produce a known encoded framed signal; means for replacing content of said copied encoded framed signal with content of said known encoded framed signal to produce a pseudo-encoded framed signal; means for determining a perceptual quality of said pseudo-encoded framed signal; and means for generating a perceptual quality of said received encoded framed signal based on said perceptual quality of said pseudo-encoded framed signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 36)
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23. A method for determining perceptual quality of a received encoded framed signal, comprising the following steps:
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copying said received encoded framed signal to obtain a copied encoded framed signal; replacing content of said copied encoded framed signal with content of a known encoded framed signal to produce a pseudo-encoded framed signal; determining a perceptual quality of said pseudo-encoded framed signal; using said perceptual quality of said pseudo-encoded framed signal to generate a perceptual quality of said received encoded framed signal; identifying one or more corrupt frames in said received encoded framed signal to obtain a record of corrupt frames; and marking a set of frames in a known encoded framed signal in accordance with said record of corrupt frames to produce said pseudo-encoded framed signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification