Ключевые слова: 2d, acoustic, amplifier, announcement, audio, call, clatter, communicate, communication, concept, design, element, equipment, flat, graphic, high, icon, illustration, loud, louder, loudness, loudspeaker, megaphone, message, mute, muted, noise, noiseless, quiet, shout, silent, sonance, sound, soundless, speaker, speech, style, symbol, technology, tone, tune, unvoiced, vocal, voice, voiceless, volume, vox, web, without,