[DOC] Add basic requirements
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# c3lingo-interpreter-unit
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# Conference Interpreter Unit
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[c3lingo.org](https://c3lingo.org) is doing the great job of translating many talks of the Chaos Communication Congress and other CCC-related events to multiple languages.
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But the required hardware for simultaneous translation is quite expensive to rent, even if it's "just" a specialized analog audio mixer.
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So the idea was born to design an easy to use hardware with the special requirements of our interpreters in mind.
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## Requirements
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The hardware unit should deliver the native audio (stage/ hall mix) to the interpreter's headset and provide a sum of all interpreter's microphone to the input of the video streaming/ recording chain.
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Mixing of the final translated audio (ducking the native audio with the translation) will be done as part of the streaming/ recording chain, so the interpreter unit should just provide the sum of all microphones.
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Normally just 2 interpreters will provide one translation, but demanding talks might require 3 people.
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So either 3 headphone inputs/ outputs should be provided or it must be possible to daisy-chain multiple units.
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The user interface of the unit should be as simple, as possible to decrease the risk of mis-configuration.
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This means, that no compressor and equalizer will be added in the input group.
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General requirements:
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- Line input of stage/ hall mix (native language) (XLR/ 6.3 mm balanced jack combo connector)
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- 3x Microphone input (XLR) (at first just dynamic microphones)
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* VU-Meter for each input channel. (Perhaps with special color scheme: too quiet, good, too loud, clipping)
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* Fader/ Potentiometer for gain control
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* Mute switch (on/ off position, with state LED)
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* Temporary mute button (momentary switch)
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- 3x Headphone output (6.3 mm mono/ stereo (2x mono) jack)
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* Should output mix of native audio and own microphone
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* Potentiometer for output volume
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* Potentiometer for volume of own microphone in the mix
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- Outputs:
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* Sum of all translators (XLR/ 6.3 mm balanced jack combo connector)
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All inputs (besides the microphones) and outputs should:
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- expect/ deliver a nominal level of +6dBu (german TV broadcast standard, 0 dBu = 0,775 Veff)
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- be transformer balanced and galvanically isolated
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## Status
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Requirements collection done, first research for circuit design, but no real progress yet.
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Help is always appreciated!
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