56
Redbox User Handbook No 1
SYNCHRONISERS, DELAYS &
SILENCE DETECTORS
SY
NCHR
ONISERS, DEL
A
Y
S & SILENCE DE
TEC
TORS - RB
-DS2
7
64KHZ, 88.2KHZ and 96KHZ. Changing the sample rate will mute the analogue and digital
outputs while the delay is acquired with the new setting. The default sample rate is 48kHz.
Sample Width
This option selects the sample size used in the analogue to digital and digital to analogue
conversion. From the main system menu select SAMPLE WIDTH. The available options are
16BIT and 24BIT. Changing the sample width will mute the analogue and digital outputs
while the delay is acquired with the new setting. The default sample width is 24bits.
Format
This option is used to set the number of frames per second that apply when setting the
delay in units of either Fields or Frames. From the main system menu select FORMAT.
The available options are 25 FRAMES PER SEC, 24 FRAMES PER SEC, 30 FRAMES PER SEC
and 30 DROP FRAME.
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25, 24 and 30 Frames Per Second – Selects the required frame rate. When using Fields
as the selected delay units, there are 2 Fields to 1 Frame, so the Fields per second
equivalents of these settings are 50, 48 and 60 respectively.
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30 Drop Frame – This refers to an actual frame rate of 29.97 frames per second.
The default format is 25 frames per second.
Delay Units
This option selects the units for the delay. From the main system menu select DELAY
UNITS. The available options are SAMPLES, FIELDS, FRAMES, TIME and METRES.
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Samples – This refers to the number of 16bit or 24bit samples.
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Fields – This uses the Format option to determine the actual number of Fields/second.
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Frames – This uses the Format option to determine the number of Frames/second.
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Time – In Normal mode, the time units are milliseconds. In Extended Using CF mode,
the time units are hours, minutes and seconds.
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Metres – This allows for the delay of sound travelling the selected number of metres
(calculated as the speed of sound at 20 degrees C, 343.371 m/sec). The delay is set in
units of 10 metres and is only available in Normal mode.
The default delay units are samples.
Volume
This selection shows the Volume sub-menu. The sub-menu items are INPUT PK DIGITS,
OUTPUT GAIN, ANALOGUE MUTE and DIGITAL MUTE.
Input Peak Digits
This option sets the full-scale dB input amplitude that will give full-scale digits in the digital
domain i.e the absolute maximum analogue input level that can be put into the unit before
digital limiting will occur.
From the volume sub-menu select INPUT PK DIGITS. The available options are +12 dB, +18
dB and +24 dB. The default value for input peak digits is +12dB.