REDUCTION IN THE ACQUISITION DURATION OF A PHASE-LOCKED LOOP ABLE TO RECONSTITUTE A SYNCHRONISATION SIGNAL TRANSMITTED OVER AN IP NETWORK
First Claim
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1. Reception device able to receive packets in a packet switching network comprising at least two stations, said device comprising:
- means for receiving packets containing samples, said samples coming from data sampled every period, where is from a time base synchronised on all the stations of said network,means for regenerating a counting ramp having a count increment value and a range value PCR_Modulus, using a phase-locked loop receiving the samples and further delivering local samples every Tech period and a reconstituted clock with a frequency value Fout,means for initialising, at every zero-crossing of the counting ramp, an image counter that is determined by the reconstituted clock,means for generating image cues at every zero-crossing of said counter, andmeans for reconstituting a synchronization signal from said image cues,wherein it comprises, further, means for determining the count increments values.
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Abstract
The present invention relates to the domain of video equipment. More specifically, it concerns a reception device that comprises the means for:
- receiving packets containing samples, that come from data sampled every Tech period, where Tech is from a time base synchronised on all the stations of said network,
- regenerating a counting ramp having a count increment and a range value PCR_Modulus, using a phase-locked loop PLL1 that receives the samples and that delivers local samples every Tech period and a reconstituted clock,
- initialising, at every zero-crossing of the counting ramp, an image counter that is determined by the reconstituted clock.
According to the invention, it comprises, further, means for determining the values of count increments.
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8 Claims
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1. Reception device able to receive packets in a packet switching network comprising at least two stations, said device comprising:
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means for receiving packets containing samples, said samples coming from data sampled every period, where is from a time base synchronised on all the stations of said network, means for regenerating a counting ramp having a count increment value and a range value PCR_Modulus, using a phase-locked loop receiving the samples and further delivering local samples every Tech period and a reconstituted clock with a frequency value Fout, means for initialising, at every zero-crossing of the counting ramp, an image counter that is determined by the reconstituted clock, means for generating image cues at every zero-crossing of said counter, and means for reconstituting a synchronization signal from said image cues, wherein it comprises, further, means for determining the count increments values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification