(A6.0) in Packet Sequence A, and will generally also include information associated with at least a portion of a frame.
As noted above, the master device 21 of a synchrony group 20 will enable the audio information channel device 23 that puritan bennett 760 ventilator service manual is providing audio information to the synchrony group 20 to multi-cast a message containing the resynchronize command when it receives notification from the user.
In that operation, the user interface module 13 provides information identifying the particular device whose volume is to be adjusted, and the level at which the volume is to be set to the master device.
As noted above, the zone player 11 ( n ) can operate both as an audio information channel device 23 and a member of the synchrony group 20 of which it is a member.It will be appreciated that the number of audio information sources Sn may vary as among the various zone players 11 ( n and some zone players may not have any audio information sources connected thereto.On the other hand, the zone player 11 ( n ) can operate as an audio information channel device 23 for one synchrony group 20 ( 1 ) (FIG.Other desirable time delays for information from other types of sources will be apparent to those skilled in the art.The zone player 11 ( n ) can maintain a count of the number of slave devices 22 ( g ) in the synchrony group 20 as they join and disengage, and, if the number drops to zero, it can stop transmitting the audio and.As will be made clear below, the formatting and scheduling information will control not only playback by the zone player 11 ( n ) itself, but will also enable other zone players 11 ( n 11 (.
(It will be appreciated that the times indicated by the illustrative time stamps are for illustration purposes only, and that in an actual embodiment the time stamps may have different values and differentials.) As noted above, the audio information channel device 23 multi-casts a message.
2A, both synchrony groups 20 ( 1 ) and 20 ( 2 ) are controlled by the user interface module 13, which can provide control information to, and receive status information from, the master devices 21 ( 1 ) and 21 ( 2 ) independently.
In the illustrative arrangement depicted in FIG.
After playback of a track that is currently being played has been terminated, playback will continue in a conventional manner with the next track that has been buffered in the audio information buffer.
Non-provisional patent application Ser.The header 55 ( f ) may also include fields (not shown) for storing other information that is useful in controlling playback.As noted above, during the message exchange, the messages generated by the network communications manager 40 of the zone player 11 ( n ) will provide the network communications manager of the zone player 11 ( n ) that is to join the synchrony group.In addition, it will be appreciated that a zone player 11 ( n ) can also operate as a audio information channel device 23 for multiple synchrony groups.If the zone player 11 ( n ) is operating as the master device 21 or a slave device 22 ( g ) for a synchrony group, the information that is buffered in audio information buffer 31 will include the audio and playback timing information.2A does not show a number of elements, the presence of which would be evident from figs.120 to, and is a continuation of,.S.As with Packet Sequence A, in Packet Sequence B the audio information channel device 23, in packet 162 and 163, multi-casts frames whose time stamps indicate that they are to be played when the frames that were multi-cast in packets 160 and 161 were.In that methodology, the audio information channel device 23 will transmit the audio and playback timing information in a series of messages, with each message being received by all of the zone players 11 ( n ) comprising the synchrony group 20, that is,.It will be appreciated that the latter may occur if, for example, the audio information source that provides the audio program for the synchrony group is not connected to the zone player 11 ( n ) that is operating as the audio information channel device.If the zone player 11 ( n ) is operating as the audio information channel device 23 for a synchrony group, during the sntp operation, it will provide its current time, particularly a current time as indicated by its digital to analog converter clock.2 schematically depicts a functional block diagram of a synchrony group utilizing a plurality of zone players formed within the networked audio system depicted in FIG.The playback timing information that is provided with the audio information, together with clock timing information provided by the audio information channel device 23 to the various devices 21 and 22 ( g ) as will be described below, enables the master device 21 and.If the two time values do not correspond, or if the difference between them is above a selected threshold level, the clock that is used by the audio information channel device 23 to generate the time stamps is advancing at a different rate than the.