OPERATING INSTRUCTIONS DIGITAL AMBIENT NOISE CONTROLLER DP-L2 (Version 2.00) Thank you for purchasing TOA's Digital Ambient Noise Controller. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
TABLE OF CONTENTS 1. SAFETY PRECAUTIONS ................................................................................ 3 2. GENERAL DESCRIPTION .............................................................................. 5 3. FEATURES ........................................................................................................... 5 4. HANDLING PRECAUTIONS ........................................................................... 5 5. NOMENCLATURE AND FUNCTIONS Front .........................
1. SAFETY PRECAUTIONS • Before installation or use, be sure to carefully read all the instructions in this section for correct and safe operation. • Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or cautions regarding safety. • After reading, keep this manual handy for future reference.
CAUTION Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage. When Installing the Unit • Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock. • When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock.
2. GENERAL DESCRIPTION TOA's DP-L2 is a 1U size* rack-mountable digital audio processor having an ambient noise control (ANC) function which automatically adjusts output sounds in response to changes in ambient noise level. It also features an automatic level control (ALC) function that automatically adjusts the input signal level to an appropriate level. *1U size: 44.5 mm (standard size) 3. FEATURES • ANC function distinguishes between the unit's output sound and the ambient noise.
5. NOMENCLATURE AND FUNCTIONS [Front] 3 2 5 6 4 1. Power indicator Lights when the power is switched on. Tip: The power switch (17) is located on the rear panel. 2. Sensitivity controls Adjust the input sensitivity for SENSOR input, INPUT 1, and INPUT 2. Factory-setting: 0 dB (center position). 3. SETTING key Used to set each function. If this key is pressed, the setting screen is displayed on the LCD screen. 4.
[Rear] 24 17 18 19 20 21 17. Power switch Turns on and off the power. Tip: The Power indicator (1) is located on the front panel. 18. AC inlet Connect this inlet to the AC wall outlet using the supplied power cord. 19. Functional earth terminal Hum noise may be generated when external equipment is connected to the unit. Connecting this terminal to the functional earth terminal of the external equipment may reduce the hum noise. Note: This terminal is not for protective earth. 20.
6. SETTINGS 6.1. Setting Operations and Setting Screens 6.1.1. Keys and knobs used in settings (1) (2) (3) (4) (5) (7) (6) (1) SETTING Key Permits the system setting screen to display. If this key is pressed simultaneously with the ALC key, the ALC setting screen is displayed. If pressed simultaneously with the ANC key, the ANC setting screen is displayed.
6.1.2. On-screen indications [ALC/ANC level indication screen] Displayed when in normal operation state. ALC1 0dB ME T ER ANC 1 OF F S12 The signal level of the highlighted channel is displayed by the INPUT LEVEL, OUTPUT LEVEL, and ALC LEVEL indicators. The selected channel moves cyclically among S (SENSOR level), 1 (Channel 1), and 2 (Channel 2) as the Meter indication selector key is pressed. Indicates ALC and ANC levels or their OFF states.
6.2. Setting Flow Charts 6.2.1.
6.2.2. ALC function setting flow chart Press both keys simultaneously. When CHANNEL LINK is set to OFF. When CHANNEL LINK is set to ON. GAT E GAT E LEVEL I NPUT 1 GAT E When set to NORMAL mode. SENSE PUSH – 6 0dB LEVEL I NPUT 2 I NPUT SET ENTER – 6 0dB When set to ADVANCED mode. When CHANNEL LINK is set to OFF. I NPUT I NPUT I N SENSE LEVEL – 6 0dB SET SENSE I NPUT 1 When CHANNEL LINK is set to ON. SET + 4dB I NPUT SENSE SET + 4dB P ROGR E S S . . .
6.2.3. ANC function setting flow chart Press both keys simultaneously. MI N NO I SE PUSH MI N SET ENTER NO I SE I N SET P ROGR E S S . . . MI N NO I SE SET AD J . Z ERO C OM P L E T E 0dB MAX LEVEL 0 MI N LEVEL –6 S ENS I NG f 1 S AM P L E S : +1 L : –18 PO I N T 210 . 0Hz T I ME 20sec S ENS I NG f 2 GA I N RAT I O N : S = 3 : 3 S ENS I NG f 3 When set to ADVANCED mode. ANC S E T T I NG END After 3 seconds ALC/ANC level indication screen 12 PO I N T 550 .
6.2.4.
6.2.5. INPUT LEVEL, OUTPUT LEVEL, and ALC LEVEL indication selection ALC1 OF F ME T ER ANC 1 0dB S12 The cursor moves to the channels S, 1, 2, S, and so on for selection with each depression of the METER indication selector key.
Step 1. Perform system settings. Press the SETTING key to enter the system setting screen (adjustment mode), then select the setting item with the PARAMETER knob. (See p. 10; System setting flow chart.) [Enter the setting screen.] 1-1. Set the adjustment mode. Setting parameter: NORMAL or ADVANCED The ADVANCED mode has more manually-operated setting items than the NORMAL mode, enabling fine settings. 1-2. Set the SUMMING mode.
Step 2. Set the maximum output level. Check the maximum input level of the equipment connected to the unit's OUTPUT 1 and OUTPUT 2, then adjust it to the appropriate level with the MAXIMUM OUTPUT level control. Tip Both the OUTPUT 1 and OUTPUT 2 are set to the same level. MA X I MUM OU T PU T 0dBu Step 3. Set the ALC function. The setting item differs depending on the adjustment mode (NORMAL or ADVANCED) and CHANNEL LINK (OFF or ON).
When the adjustment mode is set to NORMAL, and CHANNEL LINK to ON: Connect a sound source to INPUT 1. When INPUT 2 is used in the setting step below, also connect a sound source to INPUT 2. 3-1. Set the GATE LEVEL while monitoring the INPUT LEVEL indicator. Both the INPUT 1 and INPUT 2 are set to the same level. When the input level is below the GATE LEVEL, the ALC level is kept unchanged. When it is above the GATE LEVEL, the ALC function works to change the controlled variable. 3-2.
When the adjustment mode is set to ADVANCED, and CHANNEL LINK to ON: Connect a sound source to INPUT 1. When INPUT 2 is used in the setting step below, also connect a sound source to INPUT 2. 3-1. Set the GATE LEVEL while monitoring the INPUT LEVEL indicator. Both the INPUT 1 and INPUT 2 are set to the same level. When the input level is below the GATE LEVEL, the ALC level is kept unchanged. When it is above the GATE LEVEL, the ALC function works to change the controlled variable. 3-2.
4-4. Set the average time required to detect the ambient noise levels with the sensor microphone. Adjustable range: 10 s, 20 s, 30 s, 1 min, 5 min From the previous page S AM P L E T I ME 20sec 4-5. Adjust the ratio of ambient noise level variation to output level variation. For example, if the ratio between N and S is set to be 3:3, the output volume level goes up by 3 dB when the ambient noise level increases by 3dB.
[When the preset minimum ambient noise level is extremely lower than the actual level] In this case, the unit recognizes that the ambient noise is high even in low ambient noise condition (A) where the unit is actually used, providing sound output at high level (–3 dB in this example). SENSOR level 80 dB AD J . Z ERO 0dB Noise range in which you desire to control the output level.
(2) If the current noise level (A) is not the minimum ambient noise level when the unit is actually used, correct the ZERO level so that the output level becomes the desired level. SENSOR level AD J . Z ERO 0 dB 80 dB 11 10 9 8 7 6 5 4 3 2 1 0 Noise range in which you desire to control the output level. Current noise level (A) 68 dB + 1 0dB S : +6 L : –6 –3 Output level ZERO level correction value –6 –9 Desired output level –12 Correct the ZERO level to this position.
6.5. Restoring Default Settings [Front] Liquid crystal display BACK key NEXT key RESET key [Rear] Power switch Following 2 methods are available to revert the unit's current settings to the factory-preset parameters. (1) Method by using the power switch Step 1. Turn the power switch off. Step 2. Turn the power switch on while holding down both the BACK key and NEXT key at the same time. Note Keep pressing both the BACK key and NEXT key till the indication "RELEASE KEYS" appears on the LCD screen.
7. CONNECTIONS Be sure to use the supplied removable terminal plugs (3P, 4P) for connections to the removable terminal blocks. 7.1. Removable Terminal Plug Connection Cautions • Be sure to use shielded cables for audio signal lines. • Avoid soldering stranded or shielded cable, as contact resistance may increase when the cable is tightened and the solder is crushed, possibly resulting in an excessive rise in joint temperatures.
7.2.
8. RACK MOUNTING Notes • Install the unit in locations where the temperature is between 0 and +40°C and the moisture is less than 90% (no dew condensation must be formed). • When mounting the DP-L2 in an equipment rack, ensure good ventilation by removing all of the panels located on the rear of the rack. Also, be sure to mount a perforated panel larger than 1U size at the top and bottom of the rack.
INPUT 2 INPUT 1 SENSOR E C H E C H E C H SENSOR C SENSOR H Phantom Power +15 V GND LIFT At power OFF INPUT 2 C INPUT 2 H At power OFF INPUT 1 C INPUT 1 H At power OFF GND LIFT +15 V +4/–8/–20 dB* HA +4/–8/–20 dB* HA +4/–48 dB* HA – ∞ ~ +12 dB – ∞ ~ +12 dB – ∞ ~ +12 dB A/D A/D A/D CPU DSP INPUT 2 C INPUT 2 H At power OFF LA INPUT 1 C INPUT 1 H At power OFF LA SENSOR C SENSOR H At power OFF LA ALC/ANC STATUS Level Meter LCD Display Key/Rotary Encoder/Rotary Sw
10. RECORDING TABLE OF FUNCTION SETTINGS It is recommended that you note the current setting contents in this recording table for future reference.
11. SPECIFICATIONS Power Source Power Consumption Frequency Response Sampling Frequency Dynamic Range Distortion Input Output A/D Converter D/A Converter Signal Processing Other Feature Operating Temperature Operating Humidity Finish Dimensions Weight CU version: 110 – 120 V AC, 50/60 Hz CE/CE301/CE-GB/315H version: 220 – 240 V AC, 50/60 Hz CU version: 20 W, 300 mA CE/CE301/CE-GB/315H version: 20 W, 220 mA 20 Hz – 20 kHz (±1 dB) 48 kHz Over 108 dB (IHF-A weighted) Under 0.
