DIGITAL AMBIENT NOISE
CONTROLLER
DP-L2
DESCRIPTION
TOA's DP-L2 is a rack-mountable digital audio processor with
an ambient noise control (ANC) function that automatically
adjusts output volume in response to changing ambient noise
levels. Typical applications would include airports, stations and
shopping malls, as well as restaurants and pubs.
Conventional ambient noise controllers simply add the output
to the ambient noise, making manual compensatory
adjustments necessary. The DP-L2 features an automatic
level control (ALC) function that automatically adjusts the input
signal to keep it at a level suitable for the surrounding ambient
noise level, thus ensuring an appropriate input signal level at
all times.
The DP-L2 has 2 x Input 2 x Output, 1 x Ambient Noise
Sensor Microphone Input and 1 x Monitor Output connectors.
A range of microphones may be used for detecting ambient
noise, including ceiling flush-mounted, dynamic and
condenser types. Easy setting of all functions can be made
right at the unit, thanks to keys and knobs and an LCD (liquid
crystal display) which are all front-mounted. A protect function
prevents accidental changes in front-panel key settings. In
addition, front-mounted LED meters are provided for the input,
output, ALC and ANC levels.
FEATURES
●
Digital ambient noise control (ANC) function with 4-LED
metering automatically makes adjustments to output gain to
match changes in ambient noise levels.
●
Exclusive TOA feature distinguishes unit output sound level
from ambient noise levels, for more accurate automatic
noise control.
●
Monitoring output of sound picked up by the ambient noise
sensor microphone.
●
Automatic level control feature with 4-LED metering
maintains input signal at a constant level by adjusting input
signals to appropriate levels when the sound level is too low.
Sound volume is controlled without losing nuances of
speech or compromising background music sound quality.
This prevents the sort of unnatural sound that often results
when an AGC or a compressor is used.
●
Maximum Output function acts as a limiter. It should be set
to the rated input of the equipment to which the DP-L12's
outputs are connected.
●
Sensor input reference level fine adjustment function.
●
Sensor input phantom power switch.
●
8-LED input and output level metering on front panel.
●
Auto input sensitivity setting and sensor input reference
level measuring.
●
The LCD screen, keys and knobs are all located on the
front panel, ensuring easy operation of all settings.
●
A built-in key lock function protects against accidental
mistakes in front-panel key settings.
●
Standard 1U-size (44.5mm/19-inch) rack-mountable for
easier and quicker installation.
●
Pre-coated black steel plate finish.
DP-L2
CONNECTION EXAMPLES
When broadcasting is done via a microphone while BGM is on
DP-L2
POWER
ON
Speaker
SIGNAL
GND
RS-232C
OUTPUT 2 [+4dB]
Power amplifiers
CEH
OUTPUT 1 [+4dB]
CEH
Power amplifier
MONITOR OUT
[+4dB]
CEH
INPUT 2 [+4/–8/–20dB]
BGM player
Monitor Speaker
GND
LIFT
INPUT 1 [+4/–8/–20dB]
NORM
CEH
CEH
BGM ANNOUNCE
Stereo mixer
INPUT
NORM
GND
LIFT
Sensor microphone
(for detecting
ambient noise)
SENSOR [+4/–48dB]
CEH
+15V DC
PHANTOM
OFF
Microphone
ON
When broadcasting BGM in stereo
DP-L2
POWER
ON
Speaker
SIGNAL
GND
RS-232C
OUTPUT 2 [+4dB]
CEH
PROTECT PEAK
SIGNAL
VR BYPASS
CH 1
POWER
16
1419
1222
1025
828
632
438
345
254
166
0
– dB
Power amplifier
OUTPUT 1 [+4dB]
PROTECTPEAK
SIGNAL
VR BYPASS
CH 2
16
1419
1222
1025
828
632
438
345
254
166
0
– dB
Power amplifier
MONITOR OUT
CEH
[+4dB]
CEH
INPUT 2 [+4/–8/–20dB]
CEH
GND
LIFT
BGM player
Monitor Speaker
INPUT 1 [+4/–8/–20dB]
CEH
NORM
GND
LIFT
NORM
Sensor microphone
(for detecting
ambient noise)
SENSOR [+4/–48dB]
CEH
+15V DC
PHANTOM
ON
OFF
BLOCK DIAGRAM
+15 V +15 V
SENSOR
INPUT 1
INPUT 2
H
C
E
At power OFF
H
C
E
At power OFF
GND LIFT
H
C
E
At power OFF
GND LIFT
Phantom
Power
SENSOR C
SENSOR H
INPUT 1 C
INPUT 1 H
INPUT 2 C
HA LA
–
~ +12 dB
∞
+4/–48 dB*
HA
~ +12 dB
–
∞
+4/–8/–20 dB*
HA
~ +12 dB
–
∞
+4/–8/–20 dB*
A/D
A/D
A/D
DSP
CPU
D/A
D/A
D/A
Key/Rotary Encoder/Rotary Switch
LCD Display
Level Meter
ALC/ANC STATUS
SENSOR C
SENSOR H
LA
INPUT 1 C
INPUT 1 H
LA
INPUT 2 C
INPUT 2 H
At power OFF
At power OFF
At power OFF
H
MONITOR
OUT
C
(+4 dB*)
E
H
OUTPUT 1
C
(+4 dB*)
E
H
OUTPUT 2
C
(+4 dB*)
E
* 0 dB=0.775 V
APPEARANCE (DP-L2 CU)
SPECIFICATIONS
Power Source
Power Consumption
Frequency Response
Sampling Frequency
Dynamic Range
Distortion
Input
Output
A/D Converter
D/A Converter
Automatic Level
Control Function
Ambient Noise
Control Function
Signal Processing
Maximum Output Signal
Level Control Function
Input Level Indicator
Output Level Indicator
Other Feature
Operating Temperature
Operating Humidity
Finish
Dimensions
Weight
Accessory
DP-L2
AC mains, 50/60Hz
20W
48kHz
20 — 20,000Hz, ±1dB
Over 108dB (IHF-A weighted)
Under 0.006%, 1kHz, +4dB* input/output (20 — 20,000Hz BPF)
Sensor input (Ambient noise sensor microphone input):
+4/–48dB* changeable, 10kΩ, electronically-balanced, removable terminal block (4 pins),
phantom power (+15V DC, can be turned on or off with Phantom switch) with +15V DC terminal
Input 1, 2: +4/–8/–20dB* changeable, 15kΩ, electronically-balanced,
removable terminal block (3 pins)
Monitor output:+4dB*, 600Ω, electronically-balanced, removable terminal block (3 pins)
Output 1, 2: +4dB*, 600Ω, electronically-balanced, removable terminal block (3 pins)
24 bit
24 bit
Level meter (4 LED meters), Automatic input signal level control function.
Automatic input sensitivity setting function: +4/–8/–20dB*,
Noise gate level setting: –99 to –3dB
Level meter (4 LED meters). BGM/Announce level control function,
Automatic sensor input reference level measuring function,
Sensor input reference level fine adjustment function,
Maximum output signal level control: –15 to 0dB,
Minimum output signal level control: –18 to –3dB,
Sample time setting: 10 s, 20 s, 30 s, 1 min, 5 min
Gain ratio setting (Ambient noise; Output signal level) 6: 3, 5: 3, 4: 3, 3: 3, 3: 4, 3: 5, 3:6,
Ambient noise measuring frequency setting: 20 — 20,000Hz, 3 points
–12, –6, 0, +4, +6, +12, +18, +24dB*
8 LEDs indicator
8 LEDs indicator
Phantom power switch (sensor input), Key lock function,
Ground lift switch (INPUT 1, INPUT 2), Input/Output bypass function in power off
O°C to +40°C
Under 90% RH (no condensation)
Pre-coated steel plate, black, 30% gloss
482 (W) × 44 (H) × 303 D)mm
3.7kg
Power cord (2m) × 1,
Removable terminal plug (4 pins) ×1,
Removable terminal plug (3 pins) × 5
Note: Prepare ambient noise sensor microphone separately.
* 0dB = 0.775 V
APPEARANCE AND DIMENSIONAL DIAGRAM
422
482
465
303
285
31.8
6.1
unit: mm
44
TOA Corporation
URL : www.toa.jp/
Specifications are subject to change without notice.
Printed in Japan (0506) 833--- U
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