# 4. Advanced Encoding Settings

## 4.1 AHX Bit Allocation Pattern Settings

When the [AHX]button is selected, the window is extended as follows: (area with the closing line)

Fig. 4.1 Image of AHX bit allocation pattern settings

In AHX format, there are 32 encoding parameters to enable detailed settings. This set of parameters is called "bit allocation pattern".

There are 11 pre-allocated bit patterns, and users can also define patterns by their own.

Any integers 0 through 9 can be set. Those numbers specify weight of data over the low frequency to the high frequency. The bigger value outputs the higher quality, yet compression rate is down, meaning that the file size gets increased.

For instance, male low voice mainly consists of low frequency. By giving weight over the low frequent area, high quality and high compression data can be created. Please refer to Appendix C for more details.

## 4.2 Loop Settings

In ADX format, setting loops at any sampling points is possible.

Select an encode file to set loops, and either double click or click the loop setting button. Then a loop setting window like below is displayed:

Fig. 4.2 Loop Setting Window

The following explains about each radio button functions:

(1) None:
| Sets to No loop settings.
(2) Looping All:
| Sets to loop the entire file.
(3) Setting of Loop Points by Sample :
| Sets the beginning and the end of loop sample points. Playback range starts from the beginning sample point and ends at the last sample point before the end sample point.

To illustrate, a loop setting for 10 through 1000 samples in the Voice48a.aif file is done.

It will be shown like the following:

Fig. 4.3 Image after loop settings is done

[Remarks]

(*) In AHX format, any loop setting is ignored.

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