Whispered interpreting (chuchotage) is real-time interpretation delivered in a low voice into the ear of one or two listeners. No booth, no receiver, no technician, no setup time.
The interpreter sits beside the listener throughout the meeting and renders the speaker's content continuously, in the same simultaneous mode as a conference booth would use, but at conversational volume and only for the few people who need it.
The format suits settings where conventional booths would be conspicuous, intrusive, or impossible: VIP briefings, bilateral diplomatic meetings, board meetings with a single non-native participant, factory floor visits, on-site inspections, and confidential negotiations. The cognitive demand on the interpreter is high (effectively unaided simultaneous), so whispered assignments are capped to short durations or staffed with two interpreters who alternate.