US 2025/0211531 A1Published application

Method and device for updating a time at which at least one data packet is taken from an audiovisual stream

AssigneeAviwest

InventorsYannick OMNES, Clément GEROUVILLE, Ronan POULLAOUEC

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Abstract

A method and a device for updating a time at which at least one data packet is taken from an audiovisual stream transferred from a transmitter to a receiver by means of at least one communication network. According to the invention, the transmitter transfers a first data packet and receives a second data packet which includes time markers, calculates, from the time markers, a mean transit time, a weighted mean value and a deviation, checks whether the mean transit time is above a predetermined threshold, takes into account the mean transit time to update the time at which at least one data packet is taken from the audiovisual stream if at least the mean transit time is below or equal to the predetermined threshold.

Claims8

Dependent claims

A method for updating a time at which at least one data packet is taken from an audiovisual stream transferred from a transmitter to a receiver by means of at least one communication network, wherein the method comprises the steps performed by the transmitter of:

transferring a first data packet comprising a first time marker corresponding to the instant of sending the first packet,
receiving a second data packet comprising the first time marker, a second time marker corresponding to the time of reception of the first packet and a third time marker corresponding to the instant of sending the second packet,
storing the time of reception of the second packet,
calculating, from the three time markers and from the time of reception of the second packet, a mean transit time,
calculating a weighted mean value and a deviation between the current transit time and the mean transit time, the weighted mean value and the deviation between the current transit time and the mean transit time are calculated from the following formulae:
rttcurr=(er−ee) where ee is the first time marker and er is the time of reception of the second packet,
rtt
meancurr
=
(
α
q
⁢
u
⁢
o
-
α
s
)
*
rtt
meanprec
+
α
s
*
rtt
curr
α
q
⁢
u
⁢
o
rtt
dev
=
(
α
quo
-
α
d
)
⁢
rtt
dev
+
α
d
*
(
rtt
curr
-
rtt
m
⁢
e
⁢
a
⁢
n
⁢
curr
)
α
quo
where αquo, αs and αd are three coefficients for weighting the values used in the calculation, rttmeancurr is the mean calculated at the present instant, the variable rttmeanprec is the mean calculated at the previous iteration and rttcurr corresponds to the current value of the transit time,
checking whether the mean transit time is above a predetermined threshold, the predetermined threshold being dependent on the weighted mean value and on the deviation between the current transit time and the mean transit time,
taking into account the mean transit time to update the time at which at least one data packet is taken from the audiovisual stream if at least the mean transit time is below or equal to the predetermined threshold,
not taking into account the mean transit time to update the time at which at least one data packet is taken from the audiovisual stream if the mean transit time is above the predetermined threshold.

70 more elements

A device for updating a time at which at least one data packet is taken from an audiovisual stream transferred from a transmitter to a receiver by means of at least one communication network, wherein the device is included in the transmitter and comprises electronic circuitry configured for:

transferring a first data packet comprising a first time marker corresponding to the instant of sending the first packet,
receiving a second data packet comprising the first time marker, a second time marker corresponding to the time of reception of the first packet and a third time marker corresponding to the instant of sending the second packet,
storing the time of reception of the second packet,
calculating, from the three time markers and from the time of reception of the second packet, a mean transit time,
calculating a weighted mean value and a deviation between the current transit time and the mean transit time, the weighted mean value and the deviation between the current transit time and the mean transit time are calculated from the following formulae:
rttcurr=(er−ee) where ee is the first time marker and er is the time of reception of the second packet,
rtt
meancurr
=
(
α
quo
-
α
s
)
*
rtt
meanprec
+
α
s
*
rtt
curr
α
quo
rtt
dev
=
(
α
quo
-
α
d
)
⁢
rtt
dev
+
α
d
*
(
rtt
curr
-
rtt
meancurr
)
α
quo
where αquo, αs and αd are three coefficients for weighting the values used in the calculation, rttmeancurr is the mean calculated at the present instant, the variable rttmeanprec is the mean calculated at the previous iteration and rttcurr corresponds to the current value of the transit time,
checking whether the mean transit time is above a predetermined threshold, the predetermined threshold being dependent on the weighted mean value and on the deviation between the current transit time and the mean transit time,
taking into account the mean transit time to update the time at which at least one data packet is taken from the audiovisual stream if at least the mean transit time is below or equal to the predetermined threshold,
not taking into account the mean transit time to update the time at which at least one data packet is taken from the audiovisual stream if the mean transit time is above the predetermined threshold.

54 more elements

Dependencies are inferred from the claim text.