Technical Details

100% independence from PC resources. SOUND4 cards only require the energy from the power supply, nothing else!

3 x inputs: AES with SRC from 32 – 192 kHz, analogue audio and audio directly via the PCI bus (through audio driver).

Mixer function with built-in silence detector.

5 outputs are available at the same time: TX1 (MPX), TX2 (MPX), AES, analogue audio, and directly via the PCI bus through audio drivers, i.e. for internet streams.

Hardware audio bypass relays, should the card or the power supply from the PC be defect.

DSP computing power: 4 giga flops (Sharc 40 bit with floating point).

Multiplatform compatibility: Windows (7, XP, Vista) and Linux (Debian).

Multicard driver (the only limiting factor is the number of PCI slots in the host PC!).

Boot time of the Sound4FM4 card: max. 2 seconds.

The SOUND4 card also acts as the host PC’s “watchdog”: with the processing cards being independent from the operating system, the card can monitor the operating system and can “revive” it through a subtle “reboot” (it works sometimes wonders...) should it crash at some point. In short, the Sound4 card reboots the PC automatically in the event of a crash, avoiding even the shortest broadcast interruption.

Internal fs: 192 kHz

fs of the internal limiter: 1.5 MHz! The entire processing chain is digitalized

No plug-in for basic stereo processing or SoundFX necessary; they are included in the scope of delivery

Powerful AGC

4 track process with “fidelity” and “sound impact system” (S.I.S.)

4 track limiter

Look ahead limiter for the second processing signal, i.e. DAB or the internet 

Virtual MPX limiter

MPX power switch limiter according to ITU-R BS.412 (included!)

FmHQ compatible: low pass filter up to 17 kHz...this revolutionary filter ensures that the pilot carrier is not disturbed (-90 dB noise ratio)

Extremely short latency of 5 milliseconds!

For an extra charge, the following options are available:

  • RDS with scrolling PS
  • AoIP codec
  • Streaming solutions for internet radio
  • Audio backup

...more innovations are currently in the planning stage!


A price – performance ratio unprecedented in the sound processing sector. 

Downloads SOUND4

In a nutshell

SLG Broadcast AG distributes and integrates systems for radio and TV applications.

As a non-independent system supplier, we integrate only systems of which we are the experts - and do not depend on the knowhow of a manufacturer.