Dolby Laboratories DP524, Руководство пользователя

Страница: 19 / 38

3-5
Note
Switch positions 5 and 6 take on two roles:
•
They set the Aux Data output baud rate when S101-2 is in the Normal position and S101-4 is in the
Aux Data position
•
They set the Download baud rate when S101-2 is in the Download position.
•
Their positions are immaterial when S101-2 is in the Normal position and S101-4 is in the Command
position; the Command baud rate is at a fixed 9600 baud.
3.5.1 Switch nos. 1, 7 & 8 - Test Tone
[down]
Switch position S101-1 activates the built-in test tone generator at a nominal -18dB
amplitude relative to both digital and analog full scale. The decoded signal is
interrupted when the test tone is activated. Switch positions S101-7 and S101-8 are
typically chosen to correspond to the incoming sample rate, so that both the test
tone and audio output have the same sample rate. The frequency of the test tone
varies somewhat with the sample rate chosen.
Output Sample
Rate
Frequency S101-7 S101-8
48 kHz 1125 Hz [Down] [Down]
44.1 kHz 1033 Hz Down Up
32 kHz 750 Hz Up Down
Illegal Undefined Up Up
Keep S101-1 in the Normal position when not using this feature.
3.5.2 Switch nos. 2, 5 & 6 Software Download
[down]
The RS-232 port (J105) can be used for upgrading of the audio coding algorithm
software.
When invoking the download mode, the baud rate selection switches S101-5 and
S101-6 must also be set, depending on the data transfer rate, per the following
table:
Baud Rate S101-5 S101-6
9,600 [Down] [Down]
19,200 Down Up
38,400 Up Down
See Section 5.4 for download instructions. RS-232 interface specifications are
located in Section 6.1.
Keep S101-2 in the Normal position when not using this feature.
MAIN