Ключевые слова: abstract, audio, background, business, chair, closeup, communication, communications, concept, conference, convention, down lighting, education, entertainment, equalizer, equipment, event, horizontal, indoors, lecture, media, meeting, meeting room, mic, microphone, microphones, mobile phone, modern, notebook, object, pen, power amplifier, professional, room, seminar, show, smartphone, sound, sound engineer, sound mixer, speak, speaker, speech, stage, table, technology, up, video conference, voice, work,