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The concept of speech intelligibility has gained enormous importance in recent years.
Speech intelligibility refers to a person's ability to understand spoken language. High speech intelligibility means that a person is able to hear words and phrases and recognize and understand them quickly and correctly.
On the one hand, speech intelligibility is important for room acoustics, and this is often about optimizing conference rooms. On the other hand, speech intelligibility for emergency warning systems and announcement systems is safety-critical.
The most important method for objectively measuring speech intelligibility is standardized in the IEC/DIN60268-16. This standard describes procedures for determining speech intelligibility STI as a single value using various test signals.
Two methods are described in the IEC/DIN60268-16 standard.
- the direct method. Speech intelligibility is determined from the modulation loss of a specific noise signal.
- the indirect method. First of all, the room impulse response is determined and from this the speech intelligibility.
In addition to the market leader NTI XL2, the Bedrock SM50 device from "embedded acoustics" is accepted as a refernce for STIPA over the past few years.
The Bedrock SM50 contains everything that is required for room acoustic measurements.
In addition to STIPA, this is particular
- Reverberation time in third-octave bands
- Uncompressed sound recording
Many measurement setups for STIPA require a special sound source - a talkbox.