Informative Maps on pda-phones

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Chui (2006)

3.1.7. Audio Instruction
After the optimal route has been calculated, the information can be used to formulate a text instruction to teach user how to go to the desired location.
SpeechLib in Microsoft Speech SDK 5.1 [20] is then used to convert the text instruction into speech. As known that midi file should be the best choice to be embedded in the web background for handheld devices. Nevertheless, according to Designing Web Sites for the Internet Explorer for Pocket PC from MSDN [21], only wav files are supported for the website background sound in PDA-phones and they usually take up lots of space. Therefore, it is important to keep the file size be small with such limitation. To achieve the goal, the instruction in text has to first be kept in short and concise before the conversion into speech. First of all, all the address information of the optimal route would be gathered for the creation of the text instruction. The creation of the text instruction considers 3 coordinates information at a time and the logic is shown in Figure 22. Since the text instruction has to be kept in short, instructions such as Turn left/right to …”, Walk along or Walk into would be used and there is no duplication of any single instruction.

CS) Informative Maps on PDA-phones
Chui Pui Ling Page 36 If second coordinate is the destination
“Walk into the second coordinates
If first coordinates is a company or a shop
If second coordinate is a junction point
Create an
Instruction
“Turn left/right to the street of the second Coordinates
N
N
Y
“Turn to the street of second coordinate
Y
If first coordinates equals to second coordinates OR first coordinate is a junction point
If first coordinates equals to the previous one
“Walk along the street of the first coordinates
Y
Change the address of second coordinates to that of third coordinates
Y
N
“Walk along the street of the second coordinates
N
N
Y
End
End
End
End

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