Major Projects

Multi-dimensional WFS array (‘Speaker wall’) with 640 Channels

  • A completely modular system consisting of speaker building blocks, 16-channel networked amps and MADI control unit.
  • System architecture, concept, prototyping and design, board-level design, FPGA programming and verification, embedded controller programming. (Direct Research in cooperation with Scheck Audio for Fraunhofer Institute, Germany, 2009-2010)

Network control unit for up to 640 Channels

  • This 19″ rack device is a central controller for a state-of-the-art wavefield synthesis speaker array. It can control upto 640 speaker channels, delivered by 10 MADI streams, in a single unit. It allows audio distribution as well as parameter control across an Ethernet Layer-2 audio network, connected in loop topology as 5 CAT5 cable-runs. For user convenience it features a big volume knob, LCD display and USB port for loading and saving system configurations. It also sequences the power-on procedure of the 640 audio-amps that are under control.
  • System architecture, concept, prototyping and design, board-level design, FPGA programming and verification, embedded controller programming. (Direct Research, 2008-2009)

Network based 8-channel Class-D power amplifier

  • Based on Ethernet network infrastructure, this design reaches major design goals for use in wavefield synthesis loudspeaker arrays: lowest total cost, simple installation, high efficiency, phase-coherence. 16 of these amp units, an equivalent of 128 individual audio channels, are driven from a single, daisy-chained CAT-5 cable-run. Each channel may be attenuated, equalized and controlled through the network. The power-stage is able to drive 250W per channel, total board-size is only 185mm x 260mm.
  • System architecture, concept, prototyping and design, board-level design, FPGA programming and verification, (Direct Research, in cooperation with Scheck Audio, Germany, 2006, senior consultancy for IOSONO GmbH, Germany, 2007)

Resilient, phase-coherent Ethernet based audio network

  • Based on ubiquitous and affordable ethernet infrastructure, this design features the bidirectional, redundant distribution of 128 audio channels through a standard CAT5 cable. Bill of material for a typical network node is reduced to the bare minmum, reaching an optimized, cost-effective design. Except Ethernet PHYs and typical voltage regulators not more than a small, low-cost FPGA part is needed. Feature highlights include glitchless redundancy-switching, latency below 100us and system-wide phase coherence of audio outputs.
  • System architecture, concept, prototyping and design, board-level design, FPGA programming and verification, (Direct Research, 2005-2006, licensed to various industry partners)

Optical Audio-Snake

  • This peer-to-peer optical transmission system is designed to replace the typical multipin- and multiwire cabling of Yamahas PM1D Digital Mixing System. Two light-weight optical cables replace not less then five 50-pin multicore cables, four Ethernet and two RS232 cables, resulting in ease of use, high-level resilience and a huge saving of truck-load. Glitchless redundancy switching between two different fiber-runs is built in.
  • Concept and design, board-level design, FPGA programming and verification, senior-level consultancy (Yamaha Corp., Japan in cooperation with Riedel Funk- & Intercomtechnik, 2004)

Dual-ring, redundant optical fibre digital audio network

  • This 1024×1024 digital audio matrix is based on a distributed, rather than a centralized architecture and has multiple access points (network nodes) interconnected by bidirectional fiber links in a ring topology. It features self-healing network reconfiguration in case of failure as well as the ability to attenuate each of its more than one million possible crosspoints individually. Each node has flexible I/O-capabilities (Analog, AES3, MADI).
  • System architecture, hardware concept and design, special focus on backplane, main processor and network board design, FPGA design and verification (In cooperation with Riedel Funk- & Intercomtechnik 1999-2003), senior-level consultancy

MADI-based Digital Audio Router

  • This router features a hyper-cube architecture and is able to route 8192 inputs to 8192 outputs in any permutation. The inclusion of MADI as standard I/O, based on FPGA-technology, allows a modular and affordable realization.
  • Concept and design, prototyping, FPGA programming (Direct Research, 1997-1998)

 Ultra-high-resolution A/D conversion

  • Co-invention of a circuit and algorithm for A/D conversion in order to extend dynamic range by using off-the-shelf chips.
  • Design, prototyping and programming (Direct Research, 1995-1997, german patent application granted and transferred to StageTec GmbH, Germany)

Digital mixer engine with modular input/output system

  • This compact and low-cost TDM-based design features high audio processing power combined with modular flexibility regarding interfaces (Analog, AES3, MADI).
  • Concept, prototyping and design (In cooperation with Soundcraft, Harman International, 1994-1996)

32 channel non-linear multitrack recorder

  • Unique combination of harddisk (fast, random access) and streamer technology (affordable backup) as a direct replacement for conventional tape-based multitrack recorders, featuring a typical remote control with autolocator.
  • Concept, prototyping, design and project management (Direct Research in cooperation with AKG, 1989-1994). US, European and German patent applications granted.

Foundation of Direct Research

  • Experience and observations during past practical years in the pro-audio business resulted in various self-designed tools and equipment, including a disk-based editing system.
  • Decision to focus on audio technology research, invention and development of digital audio product design (1988 – today)

Pro-audio consultant

  • Consultancy regarding concept, design and realisation of various leading pro-level recording studios. (e.g. Kangaroo Digital, 1985, Cream, 1987 and Pilot, 1988)

Freelance sound-engineer

  • Working for various artists in the touring business (1980-1984) and later in professional recording studios, working with Herbert Grönemeyer, André Heller, Edo Zanki, Ina Deter and others (1982-1989)