Network system and output device used in this system
First Claim
1. A network system in which plural equipments are connected to network, the network system comprising:
- clock delivery or distribution means for delivering or distributing clocks and for delivering or distributing time information to the plural equipments;
clock adjustment means for adjusting clocks at respective equipments on the basis of the clocks and the time information which have been delivered or distributed by the clock delivery or distribution means; and
delay correction means for implementing delay correction to the plural equipments in consideration of network delay taking place when communication of stream is carried out on the network.
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Abstract
The present invention is directed to a network system where plural equipments are connected to network, which comprises a clock source (2) for transmitting clocks and for transmitting time information every predetermined time to a group of sync equipments such as speakers (5) and a display (6), etc. which are connected to a network (1), a contents source (4) for offering contents to the group of sync equipments through the network, and a controller (3) for offering, to the contents source (4), delay time based on network delay when contents data is sent to the group of sync equipments and decode delay at the group of sync equipments in reproducing contents to realize synchronization of clock and phase between sync equipments connected to the network.
261 Citations
13 Claims
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1. A network system in which plural equipments are connected to network, the network system comprising:
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clock delivery or distribution means for delivering or distributing clocks and for delivering or distributing time information to the plural equipments;
clock adjustment means for adjusting clocks at respective equipments on the basis of the clocks and the time information which have been delivered or distributed by the clock delivery or distribution means; and
delay correction means for implementing delay correction to the plural equipments in consideration of network delay taking place when communication of stream is carried out on the network. - View Dependent Claims (2, 3)
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4. A network system comprising:
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a clock source for transmitting clock to a group of sync equipments connected to network;
a contents source for offering contents through the network to the group of sync equipments connected to the network; and
a controller for offering, to the contents source, delay time based on network delay when contents data is sent to the group of sync equipments and decode delay in the group of sync equipments in reproducing the contents. - View Dependent Claims (5, 6)
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7. An output equipment connected to network and serving to decode contents data offered through the network, the output equipment comprising:
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clock reproducing means for reproducing clock on the basis of a reference time signal which has been received through the network; and
stream reproducing means for implementing necessary delay to the contents data which has been received through the network to decode the contents data thus obtained to output. - View Dependent Claims (8, 9)
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10. A synchronization method for a network system for taking synchronization of input or output by plural equipments connected to network, the synchronization method for network system, comprising:
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delivering or distributing time information to the plural equipments along with clock;
operating a common clock device by the plural equipments on the basis of the clock and the time information which are delivered or distributed;
using, for the plural equipments, input timing or output timing using time of the clock device in consideration of network delay and conversion delays at the plural equipments; and
starling conversions at the respective equipments on the basis of the input timing or the output timing which has been used and conversion delays at the respective equipments. - View Dependent Claims (11)
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12. A synchronization method for a network system for taking synchronization of output by plural equipments connected to network, the synchronization method for network system, comprising:
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receiving time information through the network along with clock;
adjusting clock on the basis of the clock and the time information which have been received;
receiving information indicating time at which reproduction of the contents data is started along with contents data;
determining start timing of decode operation on the basis of delay taking place in decoding the contents data on the basis of the received information; and
starling decode operation by the determined start timing to reproduce the contents data. - View Dependent Claims (13)
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Specification