Meeting Topic: Standard test materials for three-dimensional multichannel stereophonic sound
Moderator Name: Kazuho ONO
Speaker Name: NHK STRL
Meeting Location: Institute of Sound Arts, Tokyo, Japan
Kazuho ONO (NHK Science and Technology Research Institute) introduced the Standard test materials for three-dimensional multichannel stereophonic sound.
Presentation:
The 22.2 multichannel sound used with 8K broadcasts is a 3D multichannel sound format that conforms to recommendation ITU-R BS.2051, and the ARIB STD-B59. To quickly provide 22.2 sound data suitable mainly for listening tests and system evaluation, test materials were recorded and published.
These test materials include noise and other monophonic signals processed using a 22.2 channel sound mixing console as well as 22.2 channel materials recorded and produced using microphones. Most of the processed monophonic test signals are monophonic signals with directional information applied, such as assigning the signal to a specific channel or panning it between multiple channels. They are suitable for testing channel identification or motion in a system.
On the other hand, the test materials also include the microphone-recorded test materials recorded using a microphone array, which is composed of 22 microphones at one location and oriented in the 22 directions of 22.2 multichannel sound. These recordings are suitable for evaluating spatial impressions given by the reproduced sound.
Some of the test materials recorded using microphones include materials recorded using both methods simultaneously, so that the two kinds of spatial impression can be evaluated.
These test materials are available from The Institute of Image Information and Television Engineers(ITE).
Discussion:
Many of the participants actively joined in the discussion of the details of the test materials, of the 22.2 multichannel sound, and also of the launch of 8K broadcast scheduled this December.
Written By: Kazuho ONO
