How Music/Video Is Played Back; Transfer Of Content From The Pc - Toshiba Gigabeat S MES60V Service Manual

1.1.5. How music/video is played back

This section explains how the unit plays back the content (compressed music data (WMA/MP3, PCM music
data (WAV) and video data (WMV)) stored on the HDD.
The CPU reads out the content data (WMA/MP3/WAV/WMV) on the HDD and stores it in the SDRAM.
The CPU accesses to the HDD every few minutes (It differs depending on the content's bit rate.), reads out
the data, and accumulates it in the SDRAM. When the HDD is not accessed, the power of HDD is turned off
to save the power. However, as the PCM music data contains the large amount, the HDD is always powered.
The CPU restores the compressed music data in the SDRAM and converts it to PCM data.
If the data in the SDRAM is video, the CPU restores it to bit map data. The music data restored to the PCM is
sent from the SDRAM to the DAC by the CPU. In case of video data, the CPU sends the bit map data to the
LCD.)
The DAC converts the PCM music data to the analog signal, which is then outputted to headphones. The CPU
sets the volume control and equalizer levels in the DAC, which controls the volume level and equalizer levels,
using their set data.

1.1.6. Transfer of content from the PC

When the unit is connected to the PC with the USB cable, the PC recognizes the unit as a MTP device
(MultiMedia Transfer Protocol device).
When transferring the content by using the Windows Media Player on the PC, the content data is sent to the
unit via USB. Then, according to the MTP protocol, the CPU writes the received content data on the HDD.
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