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Sonntag, den 29. Juli 2007 um 20:14 Uhr
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D-STAR
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Folie 21

The way the packet is sent was described on the previous page. In the case that the voice signal and data signal arrive randomly, because the voice signal keeps to real time, the priority level is set and sent every 30mS. The data signal is sent between this voice signal. This diagram shows one voice signal, but when multiple voice signals are involved, the addition of 30mS priority level setting and the sending timing becomes multiple, so this diagram becomes more complicated.

Folie 22

When the ID-1 USB is connected to a computer and the supplied software is booted, the control screen shown above appears. By following the User Manual to operate the various buttons by the computer, the respective functions can be operated. The supplied RC-24 controller can also perform the operations, using the computer is easier and more convenient.
The signal used by this USB as has already been explained, is not directly related to the communication protocol, but rather is just the control command to be able to operate the ID-1 via the computer. Various applications utilizing this control command will likely appear in the future.

Folie 23

This diagram shows as an assumed application, accessing the ARRL homepage using the ID-1 connected to a repeater site and also connection to a wired line by modem. In this way, it is possible to think of applications like access to the Internet, or for example access to mail on a particular server, or access to an Amateur radio database archive etc.

Folie 24

We explained that it is still not possible for the ID-1 to handle a voice communication data frame, in future versions, it will be possible to sent small still pictures and voice simultaneously, as shown in the diagram. The miniature cameras used in cellular phones recently are about 96 x 96 pixels, i.e. less than 10,000-bits, so this picture could be sent in about 4~5 seconds.
Also, an application that sends GPS position data simultaneously with voice would be interesting. There are many possibilities available from now on.

Folie 25

Finally, we will explain about the Codec used to digitalize the D-STAR voice. The ID-1 uses the Codec based on the ITU G723.1 standard. This is the type that has conformity with the Internet. As shown, there are many types of Codec available, however the D-STAR utilizes one other ultra-narrow AMBE type Codec.



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