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Technology
How does it work?
Using unique Digital Signal Processing (DSP) technology, the bhi range of DSP noise elimination products remove unwanted background noise and interference from noisy speech signals to leave the processed signal much clearer and intelligible, reducing stress and enabling the user to concentrate more on what is actually being said.

The DSP processes the signal and differentiates the noise from the speech. This unwanted noise and interference is then attenuated to leave only the speech. The DSP technology is fully adaptive and no adjustments are necessary.

The signal is constantly monitored, and the DSP automatically adapts to any changes in the signal conditions.

What can it remove?
Noise can come from two areas

Transmitting end (picked up by a microphone from within a noisy environment)
Transmission process (interference) and Transmitting noise source.
This type of noise is picked up by the transmitting microphone and passed along with the speech signal to the destination, for example:

• Road noise
• Engine noise
• Wind noise
• Crowded environments
• Machinery and equipment
• Transmission noise (Interference)
• This type of noise is added to the transmitted signal on route to the destination, for example:
• Poor reception conditions
• Weather
• Other transmitted signals
• Distance.

  The bhi range of noise elimination products can remove both of these types of noise without significantly altering the speech signal.

Applications:

• Amateur radio
• HF, VHF, UHF communications
• Marine communications
• Surveillance, security and video
• CCTV
• Emergency services
• Military and covert communications
• Audio restoration
• Transport communications
• Hands free kits

The bhi ParaPro EQ20 amplified audio unit with parametric equalisation allows you to customise the sound of your received audio and control which frequencies you want to boost or cut to suit your own hearing!

Mono or Stereo inputs
The unit has two mono input sockets enabling you to connect up to two radios to the CH1 and CH2 input sockets respectively, or connection of a single stereo signal from an SDR radio, shortwave receiver, MP3 player etc, via the stereo input socket.

Choice of outputs and connections
Connect a single 4/8 ohm passive speaker or a pair of passive speakers to the left and right “Speaker Outputs” using the supplied banana plugs or 3.5mm plug to phono adapters. Use the “Source Select” button on the front panel to select the desired audio.

Easy to use controls
The EQ20 is housed in a quality compact ABS case. There are controls for Power/Volume along with two parametric equaliser channels labelled Bass and Treble, with the Bass centre frequency being adjustable from 100Hz to1kHz and Treble covering 1kHz to 10kHz. Used together these controls provide two bands of ±10dB adjustment from 100Hz through to10kHz.

Parametric Equalisation
A parametric equaliser allows any specific part of the frequency range to be selected and adjusted. The most important feature is that it allows you to select which frequency to adjust. You can specify exactly which frequency to boost or reduce giving you greater flexibility and accuracy in setting the audio to suit your own hearing. This is especially beneficial to people with hearing loss.

Use with your existing bhi DSP noise cancelling unit
The ParaPro EQ20 unit is ideal for use with the bhi Dual In-Line, Compact In-Line and NEIM1031MKII units. It can also be used with the bhi DESKTOP & DSPKR noise cancelling speakers via the headphone socket on the front.

Features

• Parametric equaliser lets you to adjust the receive audio to suit your hearing
• 10W audio per channel
• Class-D type audio amplifier for power efficiency and eliminate the need for bulky heatsinking
• 3.5mm mono or stereo audio inputs
• 4mm banana plug or RCA phono plug audio output connections
• Designed for use with 4 or 8 ohm passive speakers
• 3.5mm stereo headphone output (Class AB)
• Easy to use control of all functions
• Signal input overload feature
• 12V DC operation (2A)
• User manual and full accessory kit supplied
• Dims: 145mm (W) x 75mm (H) X 100mm (D)
• Benefits those with some form of hearing loss or impairmentPrice:  £159.95

Download BHI booklet (pdf)