BLAcoustics NMC Wall-mount NM Controller
The Wall-mount NM Controller is for use with the SMarT in-wall sound masking transducers.  The transducers are self-amplified and powered from the wall-mount controller. The controller contains a noise generator and multi-channel DSP equaliser.  The noise generator board produces a low level random analog signal. The signal is a broadband noise signal limited only to the 20Hz to 20kHz audible range.  The DSP audio processor features a 32 bit Cirrus Logic (Clock speed: 147 MHz) Digital Signal Processing chip and A/D / D/A converters working in PCM at 48 kHz with 24 bit resolution. The processor speed allows the installer to hear and verify in real time the changes applied during the equaliser adjustments. The board has volume adjustments for each of the two noise inputs. The software can be used on-site with a laptop connected via the front-panel USB connector to make the necessary adjustments to the noise curve. Equalisation is via a 31-band graphic equalizer (1/3 Oct.; ±12 dB) for each output channel. The set-up and commissioning of this equipment must be carried out by a suitably qualified electro-acoustic engineer with appropriate knowledge of the associated equipment and acoustic properties of the target areas. It is recommended that a Type I SPL and Audio Analyser be used when commissioning.
Noise Masking
Noise Masking

The principle of ‘Noise Masking’ involves the production of a noise that effectively competes with other noises that are recognised as an annoyance to the recipient. Noise Masking, often referred to as ‘Sound Masking’, is an important component of creating a comfortable working environment in office areas.