Sony Walkman MZ-R900 사용 설명서 - 페이지 17

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Fix: Some USB host controllers do not function within USB

specification. Also Windows, in conjunction with other hardware in

your system, may be consuming all the isochronous bandwidth of the

USB bus. Both of these interfere with the data flowing to the Digital

PCLink causing it to randomly insert track marks.

The main instaces where this occurs is if:

• USB frame rates are out of specification — isochronous data

transfer (required for audio) is not possible via USB with a frame

rate that is too fast or too slow.

• Controllers do not enumerate devices correctly — some controllers

do not send USB resets at the appropriate times or may enumerate

one part of a composite device.

• Corrupting audio data — some USB controllers introduce artifacts

into sound data (i.e. CATC traces of USB data have shown non-zero

vales in data that should be all zeros).

Make sure you are not running any other programs in the background

when trying to record with the Digital PCLink — anything that

causes a lot of hard disk access can effect the data flowing down the

USB bus. Virus checking programs that continually run in the

background are particular bad. Some drastically effect the

isochronous data flow down the USB bus and starve the Digital

PCLink of data. It is therefore important to disable all virus checking

programs if you are getting multiple track marks. Also, make sure

that you are running the most up to date drivers for your graphics

cards and modems. If you are on a network, it is advisable to log off.

Note

If you are using a laptop or notebook computer, the data flowing to the Digital

PCLink can be severely effected by the processing power management of the

CPU. Ensure that in the System control panel your computer is set to Desktop.

To verify this, go to Start, then Settings, then Control Panel. Click on

System and go to the Performance tab. In Performance, click on File

System and make sure your laptop is set to Desktop and not Server. Some

laptops are not suitable for the decoding and recording of MP3 via USB due to

the variable operating speed of their CPU and other power management

features. Check with your laptop manufacturer to ensure that the USB

environment on your system supports USB audio applications.