US 2009/0245124 A1Published application

Receiving device, clock synchronizing method, and computer program

AssigneeSony Corporation

InventorsTakahiro Ichikawa, Koji Obata, Tomoyuki Sato, Yoshikatsu Niwa, Junichi Otani, Tomoaki Takemura, Shinya Masunaga

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

There is provided a receiving device including: a receiving unit that receives a packet stream; an oscillator; a measuring unit that performs a measuring operation; an acquiring unit that reads the newest time stamp read from the packet stream received by the receiving unit and the newest measurement value measured by the measuring unit with a predetermined period, from a point of time when the packet stream starts to be received; a calculating unit that calculates an accumulation value of the time stamps and the measurement values acquired by the acquiring unit; a comparing unit that compares a difference between the accumulation value of the time stamps and the accumulation value of the measurement values calculated by the calculating unit, and a value corresponding to a network jitter; and a frequency control unit that controls the oscillation frequency of the oscillator based on the comparison result by the comparing unit.

Claims9

Dependent claims

A receiving device comprising:

a receiving unit that receives a packet stream where predetermined units each having at least a time stamp and a TS (Transport Stream) packet are continuous;
an oscillator that can control an oscillation frequency;
a measuring unit that divides a clock supplied by the oscillator and performs a measuring operation;
an acquiring unit that reads the newest time stamp read from the packet stream received by the receiving unit and the newest measurement value measured by the measuring unit with a predetermined period, from a point of time when the packet stream starts to be received;
a calculating unit that calculates an accumulation value of the time stamps acquired by the acquiring unit and an accumulation value of the measurement values acquired by the acquiring unit;
a comparing unit that compares an absolute value of a difference between the accumulation value of the time stamps calculated by the calculating unit and the accumulation value of the measurement values calculated by the calculating unit, and a value corresponding to a network jitter;
and
a frequency control unit that controls the oscillation frequency of the oscillator, when the absolute value of the difference between the accumulation value of the time stamps and the accumulation value of the measurement values is larger than the value corresponding to the network jitter as the comparison result by the comparing unit.

5 more elements

Dependencies are inferred from the claim text.