BHI Compact In-Line - DSP Noise Cancelling Module

The bhi Compact In-Line DSP Noise Cancelling Module is an advanced audio processing device designed to enhance your listening experience by reducing unwanted noise and interference.

Powerful digital signal processing (DSP) technology that cancels 9 to 40dB of noise

Compatible with mono and stereo signals for versatile audio input

Portable design powered by 2 AA batteries or 12V DC power supply

Ultra-low 32ms latency for real-time noise reduction

Suitable for headphones, passive speakers, and portable audio devices

Simple two-dial control system for easy adjustments

Works with radios, receivers, and software-defined radios (SDR)

Constructed from tough, impact-resistant black ABS plastic, the module is built for durability and portability. Its intuitive design allows users to quickly adjust noise cancellation levels in real-time using two rotary encoders with push-button functionality. With over 40 hours of battery life and the ability to work with various audio sources, the Compact In-Line DSP noise cancelling module provides an enhanced listening experience that brings clarity and comfort to your audio consumption.

Simple control of all functions

The Compact In-Line functions are microprocessor controlled by two rotary encoders with pushbuttons. The unit can be adjusted in "real time" to suit your noisy conditions. The “Power/Volume” control switches the unit on and off and adjusts the audio volume. The “Filter Level” control adjusts the filter level in "real time" enabling you to respond quickly to changes in conditions. You can also select between a single mono signal or stereo mode. The Compact In-Line is particularly useful for portable/mobile use as it can be powered by 2 x AA batteries. The unit is suitable for all radios and receivers and software-defined radios (SDR), including Elecraft and FlexRadio products.

Read the excellent article on this unit by Jock Elliott KB2GOM in the SWLing post online

Boost your audio

Why not boost your receive audio further and use one of our EQ20 10W parametric equaliser units with your Compact In-Line. Simply connect the "Phones Out" signal to the input of the EQ20 and connect your passive speaker or headphones to the EQ20 output. You will be able to fine-tune your audio to suit your own hearing.  This is especially useful if you suffer from hearing loss.

Specification

Power Supply

External supply: 8 to 16V (nominally 30mA, max 350mA peak)

Reverse polarity protected

Internal batteries: Type: AA x 2 (Alkaline or NiMH recommended)

Reverse polarity protected

Low battery indication threshold: 2.1V ±0.1V

Low battery indication: LED colour changes to red.

End-of-life threshold: <1.5V

Life: 40 hours typical (Alkaline or 2500mAH NiMh).

Auto power-off: 60 minutes if input signal < 60mVpk-pk

Auto power-off can be disabled if desired.

Audio Inputs

Speaker level in: Stereo or Mono

Input Impedance: ~7 Ohms

Max withstand input power: 2 Watts RMS per channel

Max input amplitude: 3.9Vpk-pk

Line level in: Stereo of Mono

Impedance: 6.7k Ohms typical

Max input amplitude: 1.6Vpk-pk

Overload indication: LED flashes for at least 3 seconds

Audio Outputs

Phones out: Stereo or Mono

Impedance: > 4 Ohms (Can also be used as Line Level output).

Max power output: 0.2 Watts RMS per channel

Volume levels: 16 levels in 3dB steps.

DSP Noise Filtering

Powerful High-performance audio processor

Modes: Enabled / Disabled (DSP filter off)

Levels: 8

Noise suppression: 8 to 40dB

Tone suppression: Up to 65dB

Ultra-low latency of 38mS

Size & weight

Size 125 x 70 x 37mm

Unit weight 0.125Kg

Case made from tough, impact-resistant black ABS plastic