# Wearable Voice Dosimetry System
## 2 Related Work  
### Voice Dosimetry Devices  
Voice dosimetry devices fall into two main categories: monitoring devices, which record parameters for later analysis, and feedback devices, which analyse signals in real time and provide alerts if certain thresholds are exceeded. Historically, these devices have predominantly used microphones for signal capture, with recent innovations incorporating accelerometers [17; 18]. Positioned either in front of the mouth or attached to the skin beneath the larynx, these devices measure fundamental frequency, intensity, and phonation time, among other parameters [19]. A chronological review of these devices reveals (Table 1) that only a few, such as the \"Ambulatory Phonation Monitor\" (KayPENTAX, Lincoln Park, NJ, USA), VoxLog (Sonvox AB, Umea, Sweden), VocaLog (Griffin Laboratories, Temecula, CA, USA), and Voice-Care (PR.O. VOICE, Turin, Italy), remain on the market. Despite their potential, their use has been largely restricted to research due to high costs ranging from USD 500 to USD 5000 and practical challenges such as size, weight, and sensor attachment [19; 20; 21; 22; 23]. These devices measure the basic parameters, and some, like the Ambulatory Phonation Monitor, also calculate additional metrics such as the number of vocal cycles or the travel distance of the vocal cords [20]. The built-in features in devices like VoxLog include ambient noise measurement and intensity self-calibration, aiding in the comprehensive assessment of vocal health and preventing the misuse of the vocal apparatus [21; 22; 23]. As shown in Table 2, three of the devices that have been commercialised for voice dosimetry measure the three basic parameters. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Author** & **Year** & \begin{tabular}{c} **Device** \\ **Name** \\ \end{tabular}  & \begin{tabular}{c} **Monitor** \\ **Feedback** \\ \end{tabular}  & \begin{tabular}{c} **Sensor Type** \\ **Measured** \\ \end{tabular}  & \begin{tabular}{c} **Parameters** \\ **Rec. Time** \\ \end{tabular}  & \begin{tabular}{c} **Sampling Rate** \\ **(Ht)** \\ \end{tabular}  & \begin{tabular}{c} **Analysis Interval** \\ **(Subinterval)** \\ \end{tabular}  & \begin{tabular}{c} **Dimensions** \\ **(cm)** \\ \end{tabular}  & **Weight (g)** & **Price** \\ \hline [PERSON] et al. & 1974 & VIC & F & Contact Mic & \(\mathsf{A}_{\epsilon}\,t_{\text{phon}}\) & & & \(12\times 6\times 4\) & \\ [PERSON] et al. [25] & 1980 & F & Mic & \(\mathsf{A}\) & & 200 & 0.5 s & \(15\times 10\times 8\) & 1000 & \\ \hline [PERSON] et al. [26] & 1983 & M & & Contact Mic & \(\mathsf{A}_{\epsilon}\,t_{\text{phon}}\) & 12 h & & 60 s [17] & \(9\times 6\times 3\) & 150 & \\ \hline [PERSON] et al. & 1989 & RALOF01 & M & \begin{tabular}{c} Contact \\ [PERSON]. Mic \\ \end{tabular}  & \(F_{\text{2-b}}\,t_{\text{phon}}\) & 12 h & 1200-1800 & 6 s (200 ms) & \(19\times 11\times 5\) & 475 & \\ \hline [PERSON] et al. & 1993 & & M & Contact Mic & \(\mathsf{A}_{\epsilon}\,t_{\text{phon}}\) & 12 h & & 0.1 s & \(13\times 9\times 3\) & 400 & \\ \hline [PERSON] et al. [28] & 1994 & F & Mic & \(\mathsf{A}\) & & & & & & \\ \hline [PERSON] et al. [29] & 1994 & M & Mic & \(F_{\text{0-A}}\) & 1.5 h & 5000 & \ \begin{tabular}{c} 70-250 ms \\ (2.5-10 ms) \\ \end{tabular}  & & & & & & \\ \hline [PERSON] et al. & 1995 & M & Mic & \(\mathsf{A}_{\epsilon}\,t_{\text{phon}}\) & 12 h & 1 & 1 s & \(15\times 9\times 4\) & 600 & \\ \hline [PERSON] et al. [31] & 2000 & M & 2 Mics & \(\mathsf{A}_{\epsilon}\,t_{\text{phon}}\) & 8 h & 100 & 2 s (10 ms) & & 120 & \\ \hline [PERSON] et al. [32] & 2001 & VACLF1 & M & Contact Mic & \(F_{\text{0-A}}\) &
\begin{tabular}{c} \(F_{\text{0-A