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In-Line Module DSP Noise Cancelling Module
(£141.63 excl VAT)
The bhi DSP noise cancelling In-Line Module cleans up noisy signals and works on most radios and receivers. It fits between your radio and extension speaker, and comes with the latest bhi DSP noise cancelling technology, which brings improved audio quality to the listener when operating in noisy conditions across all radio bands. The audio is clearer and more intelligible as a result.
- Powerful 5W amplified DSP noise cancelling module compatible with most radios and receivers
- 8 noise cancellation levels ranging from 8 to 40dB
- Reduces background noise up to 65dB for crystal-clear audio
- Simple three-position switch with status LED
- Compact design (135mm x 65mm x 46mm)
- Easy in-line connection between radio and loudspeaker
- Supports 10-16V DC power supply
- Automatic audio bypass when switched off
Not sure which of our in-line modules to choose? Read our guide to the different in-line module options.
Read our in-line module guideEasy to connect in-line with your radio
The In-Line Module has a 5W audio amplifier and connects between your radio and loudspeaker. The loudspeaker audio is muted when headphones are connected, and when the unit is switched off, the audio bypass feature routes the signal directly through to the loudspeaker.Simple control of all features
The In-Line Module is powered by a suitable 10 to 16V DC power supply and has a three-position switch that turns the unit on and switches the noise cancellation on and off. The “Status” LED illuminates red when power is applied and changes to green when the noise cancellation is active. The unit has an audio input overload LED, an audio output level adjust control and is supplied with a 3.5mm mono plug lead, fused DC power lead, user manual and 4 small rubber feet.What’s inside the unit
The In-Line Module makes use of a powerful DSP audio processing chip which utilises bhi’s DSP noise cancelling technology. This high−performance chip delivers exceptional sound quality and incorporates a full audio signal chain with 16−bit A/D converters and digital interfaces to accept the signal through the fully flexible digital processing architecture to the analogue line level.The audio amplifier stage is provided by a Texas Instruments TPA3111D1PWPP 10W Filter-Free Mono Class-D audio power amplifier chip, which is 94% efficient, eliminating the need for heatsinks, saving space on the PCB.
Who is the in-line module for?
- Amateur radio enthusiasts
- Marine comms
- PMR radio base stations
- Intercom base stations
Audio DSP chip key features
- A complete DSP−based, mixed−signal audio system consisting of a 16−bit fully programmable dual−Harvard 16−bit DSP core, a patented, high−resolution block floating−point WOLA filterbank coprocessor, and an input/output processor (IOP), along with several peripherals and interfaces, which optimise the architecture for audio processing
- Integrated converters and powered output
- Ultra−low power consumption: under 5 mA at 20 MHz to support advanced operations; 1.8 V supply voltage
- “Smart” power management: including low current standby mode requiring only 0.05 mA
- Excellent fidelity: 88 dB system dynamic range, exceptionally low system noise and low group delay.
DSP noise cancelling
The DSP noise cancelling in all our products uses techniques that study signals in both the time and frequency domains simultaneously. The algorithm looks for signals with speech and noise characteristics. Signals with modulated speech characteristics pass through, and other sounds with higher or lower modulation frequencies than speech are removed, depending on the filter level selected (8 to 40dB). There is virtually no distortion of the speech signal, even for extremely low signal-to-noise ratios of 0 dB and below, and the technology is self-adapting to changing noise environments, so no training of the noise filter is required. If the signal-to-noise ratio is extremely low, and/or a high level of noise suppression is selected, the system may yield artefacts in the form of slightly robotic speech. You can adjust the level of noise suppression to suit their own needs.
FAQs
What types of radios and receivers is this module compatible with?
The module works with most radios and receivers across all radio bands, including amateur radio, shortwave radio, and other radio communications equipment with standard audio connections.
What types of interference does the DSP technology eliminate?
The DSP technology cancels up to 40dB of noise. It is designed to eliminate unwanted background noise and interference across all radio bands to make speech clearer. The technology is specifically designed for speech signals, making it ideal for noisy radio communications environments where atmospheric noise, electrical interference, and other RF-related noise sources are prevalent.
Is the In-Line Module plug-and-play, or does it require configuration?
The In-Line Module is plug-and-play; all you need to do is connect the audio, connect power, turn it on and set the level of noise cancelling you’d like.
Is this suitable for mobile/portable operation?
While the unit is compact and designed to be used with a loudspeaker or headphones in a base station setting, it can be used for portable operation. However, the Compact In-Line or NES10-2MK4 are more suited for a portable option.
Does it support both mono and stereo signals?
Yes, this module can process both mono and stereo audio inputs using bhi’s dual-channel DSP noise cancellation technology. You may need one of our ADP-P003 stereo to mono audio adapters if you have stereo or two-channel input (check that this won’t damage your radio). We do have audio leads and adapter leads that can work with modern Class D amplifiers to avoid damage to the amplifier stage.
What's included in the box?
The In-Line Module unit, 4 small self-adhesive stick-on feet, a fused DC power lead, 1 X ALD-001 3.5mm mono jack plug lead and the user manual.
Can I use this with headphones instead of a loudspeaker?
Yes — there is a separate headphone socket on the module. You may require the ADP-S001 mono to stereo audio adapter when using stereo headphones.
Can I connect another loudspeaker or powered speaker into the headphone socket?
You cannot connect another speaker or powered speaker to the headphone output, as this could damage the amplifier stage of the unit (a ticking noise will be heard). This output and the loudspeaker output cannot be grounded by other equipment.
Can I use two radios with the In-Line Module?
Yes, you can connect two radios (two mono signals) using either our Two-Way Mini Switch Box or the 1042 Switch Box.
We endeavour to dispatch all orders received before 2:00 pm the same day.
We kindly advise that orders placed on Fridays may be processed the next working day, with dispatch most likely taking place on Monday.
Standard shipping method worldwide is Royal Mail up to 2kg. For orders over 2kg we use a parcel courier service for the UK, and a European road service for Europe. See our shipping rates & table for more information on our shipping rates.
EU customers: You are no longer charged the 20% UK VAT on your orders as a result of Brexit. Be aware that you are likely to be charged import taxes and/or duties by your own tax authorities and an administration fee by the parcel delivery company on any goods you purchase from us in the UK. But remember, you didn’t pay the 20% UK VAT on your order.
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