An open source 3D printed talkbox for speech intelligibility measurements

Ponteggia D. An open source 3D printed talkbox for speech intelligibility measurements. In: Express Paper. Audio Engineering Society; 2024. Paper 238. Available from: https://aes.org/publications/elibrary-page/?id=22584

@inproceedings{Ponteggia2024_22584,
  author = {Ponteggia, Daniele},
  title = {{An open source 3D printed talkbox for speech intelligibility measurements}},
  note = {Paper 238},
  year = {2024},
  month = jun,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=22584}
}

TY  - CPAPER
TI  - An open source 3D printed talkbox for speech intelligibility measurements
AU  - Ponteggia, Daniele
M1  - Paper 238
PY  - 2024
DA  - 2024/06/06
UR  - https://aes.org/publications/elibrary-page/?id=22584
PB  - Audio Engineering Society
LA  - en
AB  - The measurement of Speech Transmission Index (STI) with an acoustic input channel requires the use of a source that simulates a human speaker. The IEC 60268-16:2020 standard suggests the possibility of utilizing a simple loudspeaker driver enclosed in a small box with a recommended opening size of less than 65 mm to mimic the directional behavior of a human voice. This device, referred to as a "talkbox" by the IEC standard, is commonly employed for such purposes. However, achieving a linear response within the octave bands ranging from 125 Hz to 8 kHz, as required by the STI measurement technique from such a small loudspeaker cone driver, is non-trivial. Commercial implementations often resort to equalization to linearize the response of the device. In this paper, we present the design and implementation of a low-cost talkbox leveraging 3D printing technology and we explore a method for linearizing the response of the talkbox using pre-distortion of the STI/STIPA signal.
ER  -