Specifications

Processing Structure

the dSPXmInI-hd and ItS ProceSSIng Structure

The DSPXmini-HD broadcast audio processor is intended to be used for processing audio prior to digital audio

broadcast or streaming.

Before we discuss the processing structure in full we would like to tell you a little about the final peak limiting

stage of the DSPXmini-HD. It employs look-ahead limiting as opposed to clipping. Look-ahead limiting produces

less artifacts than conventional clipping, so will reproduce the original audio more accurately with less bits of

digital information because it is not wasting bits encoding non-audible clipping artefacts. Look-ahead limiting pro-

duces less harmonic distortion but produces IM distortion if over driven resulting in a packed, busy sound.

the ProceSSIng Path

Input selection and conditioning

The DSPXmini-HD offers the user input selection (analog or digital input) and level setting.

Bass enhancement

The DSPXmini-HD offers a bass enhancement via peaking filter that can be set to provide up to 6dB of gain

on one of four frequencies with a choice of 4 Q's. This can be thought of as a simple bass parametric.

Xover

The DSPXmini-HD employs linear-phase time aligned digital FIR filtering to split the audio spectrum into 4

bands while maintaining sonic transparency.

Multi-band AGC

The DSPXmini-HD processes each band with RMS based levellers. Each bands gain control processing

function can be configured in different manners to provide different effects. Adjustable timing constants, drive

and gating afford the user with full control of this important re-equalisation stage of the processor.

Multi-band limiters

Each band has its own dynamic peak limiter. Multiple time constant based detectors are fully adjustable as

well as input drives.

Mixer

The four bands are 'virtually' mixed together at this stage, allowing overall EQ adjustment.

Look-ahead limiter

The DSPXmini-HD look-ahead limiter is one of the most sophisticated available in a broadcast processor.

Output selection, processing and routing

The DSPXmini-HD allows the user to select the output levels for both analog and digital outputs. The digital

output sample rate can also be configured to a variety of settings.