Method and arrangement in a communication system
First Claim
1. A method of manipulating a digitized sound signal transferred over a packet switched network in the form of data packets, the method being operable in a communication system at a receiver end arranged to decode received sound data packets into sound signal frames to be played back, the method including the step of:
- manipulating the length of received signal frames by performing time expansion or time compression of one or more signal frames at time varying intervals and with time varying lengths of the expansion or the compression, said intervals and said lengths being determined so as to maintain a continuous flow of signal samples to be played back.
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Accused Products
Abstract
The present invention relates to the decoding-/playback part of received sound data packets in systems for transmission of sound over packet switched networks. According to the invention, the lengths of received signal frames are manipulated by performing time expansion or time compression of one or more signal frames at time varying intervals and with time varying lengths of the expansion or the compression, said intervals and said lengths being determined so as to maintain a continuous flow of signal samples to be played back.
44 Citations
25 Claims
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1. A method of manipulating a digitized sound signal transferred over a packet switched network in the form of data packets, the method being operable in a communication system at a receiver end arranged to decode received sound data packets into sound signal frames to be played back, the method including the step of:
manipulating the length of received signal frames by performing time expansion or time compression of one or more signal frames at time varying intervals and with time varying lengths of the expansion or the compression, said intervals and said lengths being determined so as to maintain a continuous flow of signal samples to be played back. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Apparatus for receiving a digitized sound signal from a packet switched network, the arrangement including:
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a memory element for storing a computer program and vectors of samples of a received digitized sound signal together with corresponding signal segments; and
a processor unit for executing the computer program to decode the received sound signal and produce therefrom sound signal frames to be played back by manipulating the length of received signal frames by performing time expansion or time compression of one or more signal frames at time varying intervals and with time varying lengths of the expansion or the compression, said intervals and said lengths being determined so as to maintain a continuous flow of signal samples to be played back.
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24. An article of manufacture including a computer memory wherein is located a computer program for causing digitized sound signal transferred over a packet switched network in the form of data packets to be received by a receiver unit of a communication system and to decode received sound data packets into sound signal frames to be played back by manipulating the length of received signal frames by performing time expansion or time compression of one or more signal frames at time varying intervals and with time varying lengths of the expansion or the compression, said intervals and said lengths being determined so as to maintain a continuous flow of signal samples to be played back.
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25. A receiver unit for receiving digitized sound in the form of data packets over a packet switched network, the receiver including a processing element having a memory wherein is located a computer program for causing said receiver unit to decode received sound data packets into sound signal frames to be played back by manipulating the length of received signal frames by performing time expansion or time compression of one or more signal frames at time varying intervals and with time varying lengths of the expansion or the compression, said intervals and said lengths being determined so as to maintain a continuous flow of signal samples to be played back.
Specification