Buying Guide・2015-11-22

STIPA Speech Transmission Index Measurement and Electroacoustic/Architectural Acoustic Optimization (Part 2)

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【Written by / Hunk Huang】

In the previous issue of the monthly newsletter, we introduced STIPA. Now that everyone has a preliminary understanding of STIPA, we will next explore how to actually measure STIPA.

STIPA Measurement and Preparation

STIPA measurements are divided into two categories: one is device playback, where measurements are taken at the listener's position. This method can be used if the device only plays back signal sources. The other is link testing, where sound is picked up by a microphone and amplified, with measurements taken at the listener's position. If a public address system with microphones is installed, this method should be adopted to reflect the microphone's pickup frequency response and the preamplifier's amplification capability. This test requires placing a standard talkbox speaker 0.5m in front of the microphone for pickup, so the following equipment must be prepared for testing:

Standard talkbox speaker with built-in signal source, such as: BEDROCK BTB65 complete sound reinforcement system

Environment close to normal use, noise level measurement and confirmation STIPA tester

communication equipment such as intercoms to adjust the output volume

Tripods with height up to 160~170cm x2 more..