Media Technology Systems ION8.8 - Manual (Page 11)

Page 11 of 26 Jul‐09
Figure 3-2: Bypass OID value
Router (OUT) OID value
OFF/MUTE 0
IN 1 to OUT 1
IN 2 to OUT 2
IN 3 to OUT 3
IN 4 to OUT 4
… …
Inn to OUT n
Figure 3-3: Router OID value
Simple timing values are defined by using the sample rate divided by the block size. The
Hold Time shown in Figure 3-4 is calculated by the algorithm HT = ( Desired Time in
Seconds )*48000/16, where the sample rate is usually 48kHz and the block size is 16.
Hold time OID value
(S) Sample/Block
10 30000
1 3000
0.1 300
Figure 3-4: Hold time OID
Other dB values (eg, Threshold, Depth and Knee) are calculated by the algorithm
(
Target dB value) *2^23. See Figure 3-5 for example values.
Threshold/ OID value =
Depth/Knee (dB) dB x 2^23
24 201326592
12 100663296
0 0
‐12 ‐100663296
‐24 ‐201326592
‐36 ‐301989888
‐48 ‐402653184
‐64 ‐536870912
‐100 ‐838860800
Figure 3-5: Depth, Threshold & Knee OID values
Other values are calculated from the Sample rate. For example the Frequency of a sine
wave generator is calculated by F = 2*( Desired Frequency in Hertz )/48000 and then the
result multiplied by 2^31 to get a 2 bit value – see Figure 3-6 below