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Dossier 04 · Calibrated Acoustic Source for Paging Mics

Bedrock TalkBox (BTB65 / BTB115) vs. ITU-T P.51 Artificial Mouth

Why firefighter paging microphones require a DSP-equalized artificial mouth with ±1 dB flatness.

Whenever a paging microphone is part of the voice alarm chain, IEC 60268-16 (Edition 5, p. 36) requires an acoustic test source with a maximum transducer diameter of 6.5 cm and a frequency response flat within ±1.0 dB from 125 Hz to 8 kHz.

B&K 4227 Mouth Simulator per ITU P.51
Laboratory Mouth Simulator B&K 4227 per ITU-T P.51.
Bedrock STIPA TalkBox
Field Reference: The DSP-calibrated Bedrock STIPA TalkBox with integrated laser pointer.

The Bedrock BTB65 / BTB115 TalkBox combines a DSP-linearized amplifier/speaker with built-in STIPA test signals and an on-axis alignment laser.

Bedrock TalkBox BTB65 Calibrated Frequency Response Calibrated frequency response of the Bedrock BTB65 TalkBox within ±1 dB across the entire STIPA range.

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📚 All 6 Chapters in the PAVA & STIPA Compendium:

Original Wiki Article ↗
01. EN 50849 & IEC 60268-16 Standards 02. STIPA in 18s vs. Full STI (5 Min.) 03. Ambient Noise Correction (-15 to +15 dB SNR) 04. Bedrock TalkBox vs. ITU P.51 Mouth 05. Center 326 vs. AZ8930 & B&K 4231 Inside 06. Reverb Time (RT60) & Open-Plan Offices