References
- von Arentsschild O., Fröber B. Comparative measurements of the effect of a directional microphone in the hearing aid. J Aud Tech 1972; 11: 6
- Birk Nielsen H. A comparison between hearing aids with directional microphone and hearing aids with conventional microphone. Scand Audiol 1973; 2, 1973
- Dalsgaard S. C., Pedersen S. B. The power density of Danish speech. 1966, Ingeniøren, Transactions 4
- Fröber B. A hearing aid with directional microphone. Free University of Berlin. 1970, Thesis
- Lentz W. E. A summary of research using directional and omnidirectional hearing aids. J Aud Tech 1974; 13: 2
- Nielsen T. E. Directional microphone. Scand Audiol 1972; 1: 135
- Tonning F. M. Directional audiometry. Acta Otolaryng (Stockholm) 1970; 69: 368