Developed in compliance with ITU-T P.57 and P.58 standards, LHT 1.1 LN adopts an anthropomorphic structure close to human anatomy, which can accurately capture the real acoustic characteristics of voice interaction terminals. It supports flexible assembly with left and right ears (equipped with ear simulators) and artificial mouth.

To fully cover the full frequency range of human voice, the artificial mouth outputs full-spectrum sound with ultra-low distortion, and supports ultra-wideband and full-band testing specified in 3GPP TS26131-32.

System Description

■ LHT 1.1 LN is designed for testing various acoustic transducers such as mobile phones, headsets, smart speakers, in-vehicle voice systems, smart screens and hearing aids. It simulates human sound diffraction and reflection features to complete voice transmission and reception tests, fully meeting all acoustic test demands in actual communication scenarios.

■ The artificial ear consists of pinna and ear simulator. The pinna is developed in accordance with ITU-T P.57 Type3.3, perfectly suitable for testing in-ear headsets, hearing aids and other in-ear devices. The ear simulator conforms to IEC 60318-4.

■ The artificial mouth complies with ITU-T P.58, maintaining consistent free-field transmission performance at all test positions.

■ The built-in shoulder and torso simulator accurately restores human acoustic diffraction and reflection properties, making it ideal for far-field acoustic testing. Its overall dimensions comply with ITU-T P.58 and meet all head profile tolerance requirements. Each LHT 1.1 LN is equipped with BEQ digital equalizer, enabling the collected ear signals to be switched among DF, FF and ID sound fields.

Main Features

■ Left & right anatomical pinna simulators compliant with ITU-T P.57 Type3.3

■ BEQ digital equalizer supporting DF, FF and ID sound fields

■ Artificial ear frequency range: 3Hz-20kHz

■ Ear simulator compliant with IEC 60318-4 (60711)

■ Compatible with human auditory perception and conventional measurement methods

■ ITU-T P.58 compliant artificial mouth

■ Artificial mouth frequency range: 50Hz-20kHz, capable of ultra-wideband and full-band real human voice simulation testing

■ Handheld terminal voice test: Mobile phones, VoIP phones

■ Hands-free terminal voice test: Mobile phones, VoIP phones, in-vehicle voice systems, smart speakers, smart screens

■ Headset terminal voice test: Over-ear, in-ear, semi-in-ear headphones, hearing aids, etc.

■ Testing for active and passive hearing protection systems (industrial use)

■ Voice recognition testing for diverse scenarios

■ Standard and customized voice quality tests: 3GPP TS26131-32, VFTST-NB/WB P.1100, P.1110, P.1120, P.1150, ETSI 202737-40, Zoom, Teams and more