GUIDE
How AI simultaneous interpretation works: from the stage to the phone, step by step
In three sentences
- The flow has five steps: stage audio is taken from the mixer, speech becomes text, text is translated in context, the translation is spoken again with a natural voice, and one broadcast per target language goes to that language room.
- Attendees scan the event's QR code, choose a language in the browser and listen or read captions; nothing is installed and audio continues while the phone is locked.
- Total delay is 3–6 seconds including the network; most of it comes from waiting for a translatable unit of meaning to form — human interpreters also speak 2–6 seconds behind.
This guide explains, without jargon, how a speaker's voice at a conference or seminar reaches an attendee's phone in another language. The purpose is not marketing but expectation: which steps exist, where delay comes from, what the operator does and under which conditions the system does not work well.
1. Where does the audio come from?
Everything starts with a clean audio source. The hall mixer's record or aux output is connected to the capture computer in the hall, which splits the audio into small chunks and sends them over a secure connection to the cloud. In a crowded hall you work with the stage microphone, never a phone microphone: echo, hum and distance are the biggest sources of error. That is why rehearsal always uses the real microphone and the real mixer output.
2. Speech becomes text
Incoming audio is transcribed in the source language. The system does not wait for the sentence to end; it processes a meaningful chunk as soon as one forms. Speaker pace, accent and technical terms affect this step; a topic and term list shared before the event improves accuracy. The stage language is set by the operator; thirteen source languages are supported and the operator switches the source when the session language changes.
3. Text is translated in context
The text is translated into the target languages together with the context of previous sentences. Context matters: the same word means different things in a medical session and a marketing panel. Translations are produced in parallel, one per target language; two or ten languages feed on the same source text. This step also produces the text output: live captions are ready a few seconds before the spoken version.
4. The translation is spoken with a natural voice
For each target language the translated text is spoken again with a natural voice. The goal is not to imitate an interpreter's voice but to deliver a clear, consistent narration. The speaker's emotional tone is conveyed approximately, from cues extracted from the text; sentence-by-sentence perfection is not promised, and it is not written that way in sales copy either.
5. Language rooms and broadcast
One audio-and-caption broadcast is produced per target language and reaches everyone who chose that language at the same time. Fifty or five thousand listeners change the scale of the broadcast, not the interpretation work. That is why cost scales with source hours × target languages, not with audience size. The event's listener, help, operator, QR and capture links are permanent; the poster is printed once.
6. What happens on the attendee's side?
The attendee scans the QR code on the poster, picks a language on the page that opens in the browser and starts listening; earphones optional, phone in the pocket, audio continues with the screen locked. Anyone can mute the audio and read captions only. An event-specific help page exists for problems; the most common causes are weak cellular signal and the browser's audio permission.
7. Stage-language return room and Q&A
The stage language is always an open return room. When a question is asked from the floor in another language, the Q&A capture input takes that audio, interprets it into the stage language and delivers it to the speaker; the answer is broadcast to every selected language. The operator chooses which source (stage or Q&A) is live; both may stay connected but only one is processed at a time.
8. What does the operator do?
During rehearsal the operator measures audio and delay, sets the source and target languages, watches service health and capacity indicators throughout the session and switches the source when needed. The administrator manages the program, halls and permissions. The technical crew of a booth setup is replaced by one field operator or trained customer staff.
9. Why is the delay 3–6 seconds?
A small part of the delay is network and processing; the large part is waiting for a translatable unit of meaning. A sentence cannot be translated correctly before its subject and verb have arrived — which is why human interpreters also speak 2–6 seconds behind. A sub-second "instant" promise does not fit the nature of the task; VerbaStage states this openly and measures it in the hall during rehearsal.
10. Where does it not work well?
Poor audio (echoing hall, distant microphone, several people speaking at once), weak or intermittent internet and dense jargon that was not shared in advance reduce accuracy. For legal, medical and diplomatic high-stakes content a human interpreter or a mixed setup is recommended. These limits are not hidden; they are evaluated together during rehearsal.
Frequently asked
- Do attendees need to install an app?
- No. The QR code opens in the browser; they choose a language and listen.
- What happens if the internet drops?
- The hall's broadcast stops; audio pauses on the attendee side and resumes when the connection is back. That is why stable internet and a backup connection are part of rehearsal.
- How many languages are broadcast at once?
- Target listener rooms are English, German, French, Spanish, Arabic and Turkish; additional languages are evaluated per project. Plans do not limit the selected targets for an event; each target uses language-minutes from the speaking time.
- Is the talk recorded?
- Recording, transcript and replay follow the event contract and retention period; there is no default surprise — what is kept is agreed in advance.
- What if the speaker switches language?
- The operator switches the source language; thirteen source languages are supported. Mixing languages within one sentence reduces accuracy.
Instead of reading, listen: a live demo with your own voice.
Start a short live demo with a few details and microphone permission; see the delay, audio and captions on your own phone.
Last updated: 2026-08-27. This guide describes real product behaviour; figures follow our realism principle.