sound waves, audio signals, speaker, volume, frequency, transmission, communication, broadcast,

representations communication transmission illustrating broadcasting presentation handwriting calligraphy advertising variations frequency broadcast document signals speaker flanked diagram cartoon drawing writing volume signal depict number circle sound waves audio shows brand label icon wave digi font text line logo sound waves audio speaker volume frequency signal transmission communication broadcast acoustics digital analog music speech voice soundwave vibration oscillation amplitude wavelength propagation hearing listening loudspeaker microphone output input electronics technology system device interface processing engineering recording playback media effects sonics audiophile dynamics harmonic phase decibel