JITTER BUFFER CONTROL METHOD AND COMMUNICATION APPARATUS
First Claim
1. A communication apparatus that receives, via a packet network, a packet transmitted by a transmission side, the apparatus comprising:
- a jitter buffer in which after the packet received is written, the packet being is read; and
a control unit that obtains an inter-packet jitter based on difference information between time stamp information at the time of reception of the packet and another time stamp information attached to the packet at the time of transmission of the packet by the transmission side, with regard to at least one of a plurality of the received packets, and that performs control to change a reference frequency in accordance with the inter-packet jitter to transmit the packet from the jitter buffer based on a changed transmission frequency.
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Accused Products
Abstract
Disclosed is an apparatus comprising a jitter buffer that writes and reads packets transmitted via a packet network from a transmission node, a clock correction unit that obtains an inter-packet jitter, based on difference information between time stamp information at the time of reception of the packet on a receiving side and time stamp information attached to the packet at the time of transmission of the packet by a transmission node with regards to packets received before and after and obtains a transmission frequency and a PLL unit that receives frequency information from the clock correction unit and generates a clock of the frequency. A scheduler uses a frequency from the PLL unit as a transmission frequency to transmit a packet from the jitter buffer unit.
29 Citations
20 Claims
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1. A communication apparatus that receives, via a packet network, a packet transmitted by a transmission side, the apparatus comprising:
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a jitter buffer in which after the packet received is written, the packet being is read; and a control unit that obtains an inter-packet jitter based on difference information between time stamp information at the time of reception of the packet and another time stamp information attached to the packet at the time of transmission of the packet by the transmission side, with regard to at least one of a plurality of the received packets, and that performs control to change a reference frequency in accordance with the inter-packet jitter to transmit the packet from the jitter buffer based on a changed transmission frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a jitter buffer in which a packet received via a packet network from a transmission side is written and read, the method comprising;
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detecting a change of jitter of a received packet; and controlling the jitter buffer so that, with regard to increase of the jitter, delay in the jitter buffer decreases. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A computer readable recording medium storing a program that causes a computer comprising a communication apparatus that receives, via a packet network, a packet transmitted from a transmitting side, to execute the processing comprising:
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obtaining an inter-packet jitter based on difference information between time stamp information at the time of reception of the packet and another time stamp information attached to the packet at the time of transmission of the packet by the transmission side, with regard to each of a plurality of received packets; and performing control to change a reference frequency in accordance with the inter-packet jitter to transmit the packet from the jitter buffer based on a changed transmission frequency. - View Dependent Claims (20)
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Specification