还音 meaning in Chinese

acoustical reproduction
sound reproducing

Film 35 mm ; film projectors ; nomenclature , projector head with sound - reproducing heads
35 mm胶片.电影放映机.第2部分:术语装有还音磁头
Overall electro - acoustic frequency response for repro - duction of 35mm optical sound track ? reproduction cha - racteristics
35mm影片光学声迹的还音电声频率响应特性
Cinematography - spectral response of photographic audio reproducers for analog dye sound tracks on 35 mm film
电影摄影学. 35 mm胶片上模拟染色声带用摄影还音器的光谱响应