Very high data rate television using the parametric acoustic source

Television pictures with a video bandwidth of 35 kHz were transmitted acoustically over a 4‐km water path in Seneca Lake, New York State. The parametric source used a 25‐cm‐diam projector having a mean primary frequency of 245 kHz. A combination of a scan converter and a speed changing tape recorder resulted in a 265‐line picture with a frame rate of one per second. The narrow 2° beam‐width minimizes multipath distortion and makes high speed acoustic: transmission feasible.