Professional Acoustic Analysis System for Voice: CSL 4150B
The CSL 4150B is a state-of-the-art hardware/software device developed by KayPENTAX, a world leader in speech, voice and swallowing instrumentation. This system is designed to meet the specific needs of voice professionals, researchers and teachers in acoustic phonetics. It offers a reliable and proven solution for voice signal acquisition and analysis, with over 20 years of clinical and scientific use.
Unlike generic sound cards, the CSL 4150B is optimised for recording rather than playback, ensuring greater accuracy in capturing speech signals. It uses low-latency ASIO drivers, high-gain preamplification and anti-aliasing filtering to ensure superior signal quality. These features enable accurate measurement of disturbances and noise in the voice, which are essential in the assessment of speech disorders.
Acoustic performance and clinical reliability
The Model 4150B features two analogue XLR/phone-type input channels with AC coupling that eliminates low-frequency components for improved signal quality. Its sampling frequency ranges from 8,000 to 50,000 Hz, making it suitable for a wide range of clinical and educational applications. It offers a dynamic range greater than 90 dB and a frequency response of 5 to 30 kHz (±3 dB), ensuring faithful reproduction of the voice signal.
The system also includes a digital interface in AES/EBU or SPDIF format, with transformer coupling, and compatibility with ASIO and MME software interfaces. The computer interface is a half-format PCI card, easy to integrate into standard computer configurations.
Powerful software suite and specialised applications
The CSL 4150B is compatible with the main CSL programme, which offers acoustic analysis tools such as spectrograms, spectral analysis, linear predictive coding and much more. In addition, a suite of more than 20 specialised software programs is available for clinical assessment, real-time feedback, linguistics, phonetics and forensic applications.
Clinical software includes ADSV™, MDVP™, MSP, VRP and ASL, each targeting specific aspects of voice and speech disorders. Phonetic databases and interactive educational tools are also available, making the CSL 4150B an ideal platform for teaching phonetics and vocal physiology.
