Robertsonics designs high performance embedded audio players and processors, used worldwide by professionals and hobbyists alike.

  • MP3Trigger_250

    MP3 Trigger

    Keep things simple. 18 trigger inputs connect to your contact closures to fire specific MP3 Tracks (up to 192kbps stereo) on a microSD card, or to implement transport functions like next, previous, stop, random play, volume etc. Simple, ASCII-based serial protocol makes it easy to control from an Arduino. Text init file allows setting the serial baud rate and alternate trigger functions. Special trigger modes allow simple logic without the need for an external microcontroller. Firmware upgradable.

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    Carina is the only Blackfin development board designed from the ground up for audio. Everything you need for a professional stereo effects processor. Sporting a 400MHz Blackfin, 256MB of external SDRAM, balanced stereo inputs and outputs, 24-bit ADC/DAC >98dB SNR, and sample rates up to 96KHz. A 26-pin IDC connector provides plenty of general purpose I/O for user interface controls. A “plug-in” style software framework for VisualDSP lets you immediately focus on algorithm development.

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  • New_250

    WAV Trigger

    For professional and demanding applications. The worlds least expensive truly polyphonic embedded audio player – allowing you to play and layer up to 14 CD quality (16-bit, 44.1kHz, stereo) tracks independently. Additional trigger modes and settings provide pause and resume capability, specify track ranges for stop, random and sequential play. Trigger inputs support passive (contact closure) or active (3.3V / 5.0V logic) as well as inverted modes on an individual basis. MIDI serial option provides velocity-sensitive triggering of up to 2048 tracks. Stereo line-level output, on-board 2W mono amplifier and speaker connector for true single-board operation. Low-power sleep mode for battery operation. Firmware upgradable.

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Latest Blog Post

Just posted v1.28 of the WAV Trigger firmware that dramatically improves the quality of the built-in track fades, and MIDI attack and release volume fades. Previously, volume was adjusted on a per audio buffer basis, resulting in small steps in volume that produced slight, but sometimes noticeable, distortion during fades. The new version now adjusts volume on a per sample basis, producing much smoother dynamic volume adjustments.

I also nailed a couple of subtle issues with interrupt priorities that caused random audio glitches when maxing out 14 voices repeatedly, such as rapidly playing lots of MIDI notes/chords with long release times.

Finally, this new version implements the MIDI Sustain Pedal controller, to make the WAV Trigger even more of a musical instrument.

As I mentioned previously, I’m currently working on support for seamless looping, eventually to include adjustable loop length and starting positions. Loops take more memory than voices, so adding loops will reduce the number of traditional voices. The first implementation will likely be a separate firmware release that supports say 4 independent loops and 8 traditional voices. Exact allocation TBD.

Haven’t posted in a while, so I thought I’d give a brief update. After seeing the appreciated, but rudimentary demo video for the WAV Trigger posted by SparkFun on the product page, which doesn’t even mention polyphony – the very same demo could have been done with the MP3 Trigger – I decided that I needed to put some effort into a killer demo of my own.

I won’t spoil the surprise, but suffice to say that my application requires seamless looping, so I’m currently working on providing this capability in the WAV Trigger firmware. I mention this here because a number of people have asked for it. I used to think it was too hard, given the architecture, but it turns out that some changes I made for sample rate conversion / pitch bending have quite possibly made it more achievable.

A number of people have made some perfectly valid requests for other new features. I’m not ignoring you, I just want to try this first.

Stay tuned…