The HDTV Multichannel Sound Study Group, under the sponsorship of the Hoso Bunka Foundation, has organized approximately 30 members since 1991. To obtain a practical guideline at the multichannel sound production stage is the group's final goal. This paper describes current activity in this regard. The group has developed an acoustically transparent screen (pantent pending) which is useful for HDTV surround sound studios, cinemas, etc. Perforated screens have been used in cinemas, but their transmission coefficients are insufficient for high-fidelity sound reproduction. Studies of the relationships between the holes and transmission characteristics confirm that transmission losses at high frequencies are lower when the holes are smaller and closer together. The transmisThe HDTV Multichannel Sound Study Group, under the sponsorship of the Hoso Bunka Foundation, has organized approximately 30 members since 1991. To obtain a practical guideline at the multichannel sound production stage is the group's final goal. This paper describes current activity in this regard. The group has developed an acoustically transparent screen (pantent pending) which is useful for HDTV surround sound studios, cinemas, etc. Perforated screens have been used in cinemas, but their transmission coefficients are insufficient for high-fidelity sound reproduction. Studies of the relationships between the holes and transmission characteristics confirm that transmission losses at high frequencies are lower when the holes are smaller and closer together. The transmission coefficient is about the same as jersey cloth or Saran nets used in front of loudspeakers. The sound can be monitored in exactly the same direction as the video image with the installation of front loudspeakers positioned at the same height behind the screen.
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