bhi Compact In-Line portable DSP
Compact in-line DSP noise cancelling module, 8–40 dB, mono/stereo inputs, 12 V or 2 AA battery power
The bhi Compact In-Line is a lightweight real-time DSP noise cancelling unit, designed mainly for headphone and portable use: it also runs on two AA batteries.
Product description
The bhi DSP algorithm distinguishes speech from noise and interference: the voice remains clear and intelligible in most conditions, with excellent results on weak signals.
It accepts mono or stereo signals from 3.5 mm sockets at speaker level and line level. The output drives stereo headphones, a small passive mono speaker or a pair of powered speakers. It works with all radios and receivers, SDRs included, among them Elecraft and FlexRadio.
Two rotary encoders with push buttons control everything: Power/Volume switches the unit on and sets the volume, Filter Level adjusts the filter in real time and pressing it switches the filter in or out. It is powered at 12 V with the supplied fused cable or by two alkaline or NiMH AA batteries, with over 40 hours of operation.
For more audio power you can connect its headphone output to the input of a bhi EQ20 parametric equaliser, also useful for those with hearing problems.
Key features
Noise cancelling in 8 levels.
Over 40 hours on 2 AA batteries.
Speaker and line inputs.
Note
Wall power supplies with a 2.1 mm plug require a 2.1 to 1.3 mm adapter. High-volume speaker listening requires powered speakers.
Technical specifications
| Noise reduction | 8–40 dB, 8 levels |
| Tone suppression | up to 65 dB |
| Speaker input | Mono/stereo, ~7 Ω, max 2 W RMS per channel, 3.9 Vpp |
| Line input | Mono/stereo, 6.7 kΩ, max 1.6 Vpp |
| Headphone output | Mono/stereo, > 4 Ω, 0.2 W RMS per channel, 16 steps of 3 dB |
| External power | 8–16 V DC (30 mA nominal, 350 mA peak), reverse polarity protection |
| Batteries | 2 × AA alkaline or NiMH, about 40 hours |
| Auto power-off | After 60 minutes without signal (can be disabled) |
| Enclosure | Black impact-resistant ABS |
| Dimensions | 125 × 70 × 37 mm |
| Weight | 0.125 kg |
Package contents
- Compact In-Line module
- Fused DC power cable
HamRadioShop | DSP audio
