CH
Leave Your Message
AWA4959 Speech Intelligibility Measurement System
Hearing & Audiology Diagnostic Equipment
From Sound Level Meters and Acoustic Imagers to Calibrators and sound level sensor for professional testing and research.
Inquiry Now
AWA4959 Speech Intelligibility Measurement System.png
AWA4959 System component detail display.png

AWA4959 Speech Intelligibility Measurement System

IEC 60268-16:2020 Standard Compliance:Designed according to IEC 60268-16:2020, the AWA4959 provides standardized STI/STIPA measurement for objective speech intelligibility evaluation.

Professional STI/STIPA Measurement: Accurately evaluates speech transmission performance through Speech Transmission Index (STI) analysis in various acoustic environments.

Complete Speech Intelligibility Testing Solution: Integrating intelligent sound source, multifunctional sound level meter, and calibration equipment for a complete measurement workflow.

Real-Time STI Result Display: The system directly displays STI measurement results, allowing users to quickly evaluate speech intelligibility performance on site.

MTF Analysis for Detailed Evaluation: Provides modulation transfer function analysis across different frequency bands to identify factors affecting speech intelligibility.

Reliable Field Measurement: Designed for on-site testing in public address systems, conference rooms, auditoriums, and building acoustic applications.

    • prod_icon_03
      Class 1SLM
    • prod_icon_05
      Mobile App
    • prod_icon_07
      IEC61672
    Contact us Download
    icon1Descriptionvideo_fillProduct Videoicon2 Featuresicon3Measurement Solutionicon2Application
    product details
    WPS图片
    01

    Product Description

    The AWA4959 Speech Intelligibility Measurement System is a professional solution designed for objective evaluation of speech intelligibility based on the Speech Transmission Index (STI) and Speech Transmission Index for Public Address Systems (STIPA) methods.
    Complying with IEC 60268-16:2020 Sound System Equipment – Part 16: Objective Rating of Speech Intelligibility by Speech Transmission Index, the system provides accurate measurement and analysis of speech transmission performance in sound reinforcement systems, public address systems, conference rooms, auditoriums, transportation facilities, and other acoustic environments.
    The system integrates an intelligent sound source, multifunctional sound level meter, acoustic calibrator, and related accessories to provide a complete workflow for speech intelligibility testing, from signal generation and field measurement to STI analysis and evaluation.

    Product Video

    Features

    IEC 60268-16:2020 Compliant
    The AWA4959 follows the internationally recognized IEC 60268-16:2020 standard, which defines the calculation method, test signal requirements, and measurement procedures for objective speech intelligibility evaluation.
    Accurate STI/STIPA Measurement
    The system measures speech intelligibility by analyzing the Speech Transmission Index (STI), which reflects how clearly speech signals are transmitted within an acoustic environment
    Professional Test Signal Generation
     The AWA4959 supports professional test signal generation for accurate speech intelligibility measurement.
    Integrated with intelligent sound source, multifunctional sound level meter, and calibration equipment.

    Flexible Field Measurement for Various Acoustic Environments
    The AWA4959 is designed for on-site speech intelligibility evaluation in different environments, including: Public address systems， Conference rooms， Auditoriums，Airports and railway stations，Emergency broadcasting systems and Large public buildings.

    Measurement
    Solution

     1. System Configuration

                              Component             Model                                                                        Description
    Intelligent Sound Source AWA5512 Provides standardized test signals required for STI/STIPA measurement.
    Multifunctional Sound Level Meter AWA6292 Total value, STI, AWA8814 tripod, AWA8710-s80 Windscreen
    Performs STI/STIPA measurement, data analysis, and result evaluation.
    Acoustic Sound Calibrator (Optional) AWA6021A/L Provides Class 1 acoustic calibration before measurement.
    Signal Generator  (Optional) AWA1653 Provides optional signal output for professional acoustic testing.
    Accessories (Optional) — Includes connecting cables, microphone clamps, and other accessories.


    2. STI/STIPA Measurement Procedure

    Stable System Operation

    The sound reinforcement system should operate at the highest available gain under stable conditions, with the test signal directly connected to the mixing console line input.


    Multiple Measurements

    Multiple measurements should be performed under identical conditions, and the arithmetic mean value should be calculated as the final result.


    Professional Signal Generator Requirement

    The signal playback equipment should provide frequency accuracy within ±200 ppm to ensure reliable STI/STIPA measurement results.



                         STI MEASUREMENT PROCEDURE


    3. On-site Measurement Point Selection

                                                                          Parameter                                                                                Requirement
    Microphone Height 1.2 m ~ 1.5 m
    Distance from Reflective Surface ≥ 1.5 m
    Background Signal-to-Noise Ratio ≥ 12 dB
    Typical Listening Area Coverage Multiple measurement points
    Recommended Density At least 1 point per 50 m²
    Minimum Measurement Points Not less than 3


    Application

    Speech Intelligibility (STIPA) Measurement
    true
    true

    Speech Intelligibility (STIPA) Measurement


    An announcement that can't be understood isn't an announcement — it's noise. Measure whether the people in a room, a platform, or a stairwell can actually make out what's being said, with a single objective number.
    learn more

    Aihua Instruments TO KNOW MORE ABOUT Aihua Instruments, PLEASE CONTACT US！

    Our experts will solve them in no time.