Generating Tonal Distinctions in Mandarin Chinese Using an Electrolarynx with Preprogrammed Tone Patterns.

Area of Science:

• Speech-language pathology
• Assistive technology
• Acoustic phonetics

Background:

• Electrolarynx (EL) devices are crucial for post-laryngectomy speech rehabilitation.
• Existing monotone ELs limit prosodic features, hindering tonal language communication.
• Tonal languages like Mandarin require precise pitch variations for meaning.

Purpose of the Study:

• To evaluate the efficacy of a computer-controlled tonal electrolarynx (EL) for producing Mandarin Chinese.
• To assess the intelligibility and acceptability of speech generated by a tonal EL versus a monotone EL.
• To investigate the potential of advanced EL technology in supporting tonal language speakers.

Main Methods:

• Four native Mandarin speakers were trained to use a customized tonal EL synchronized with preprogrammed pitch contours.
• Mono- and di-syllabic Mandarin words were produced using both monotone and tonal EL conditions.
• Three native Mandarin listeners transcribed and rated the intelligibility and acceptability of the recorded speech samples.

Main Results:

• Speech produced with the tonal EL demonstrated significantly higher intelligibility ratings compared to the monotone EL.
• Listener acceptability ratings were also significantly greater for speech generated by the tonal EL.
• The tonal EL successfully conveyed distinct tonal patterns crucial for Mandarin.

Conclusions:

• A computer-driven tonal electrolarynx is a viable and effective tool for improving speech production in Mandarin speakers post-laryngectomy.
• This technology offers a significant advancement over traditional monotone ELs for users of tonal languages.
• Further development of tonal ELs can enhance communication and quality of life for individuals with speech impairments.