Motorola E398 series User Manual - Page 24

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Motorola E398 series User Manual
Technical Specifications for MP3:
Bit Rate: 65kbps max
Recommended File Size: 75k
Maximum Duration (NW dependent): 16-30 secs

Available Sound Properties

The following table describes the available MP3 encoding properties on the E398
Platform.
File
Type
MP3
24kHz
MP3
16kHz
*Overall bit-rate cannot exceed 64 kbps.

Design Guidelines

Since ring tones need to be at a consistent audible level, compressing the original content
to reduce the peak-to-average ratio is necessary. After the audio is compressed it is
advisable to re-normalize the audio to 0db before saving the compressed MP3 file.
Note: Ring tones are generally between 15-20 seconds in length. Based on the
recommended bit rates that would yield a file size between 75-150K per tone. It is
advisable to keep file size beneath 100K to allow the end-user to download multiple tones,
but there is no file size limit except for total free memory available on the device.

MotoMixer

The Motorola MotoMixer feature allows users to mix a repeating "base track" directly on
the Motorola E398 using the MotoMixer application. The base track consists of four parts:
three content-specified instruments and a drum. Four variations are provided for each part
in the base track file. Selecting one of the four variations for each of the parts at a specific
point in time creates the mix. The mix created by the user can be saved in a file referred
to as the "mix file" and can be recalled later to be used as a ringtone or sent to another
mobile phone using SMS or email. The initial release of the Motorola E398 will not support
mobile originated messages containing MIDI files.
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Sampling
Bit
Frequency
Depth
16
16
Bit-rate
Mono/Stereo
(kbps)
Stereo
Stereo
40
40