Ear and Mouth Simulators for Telephonometry

Brüel & Kjær's Test Head, Mouth Simulator and Ear Simulators provide optimal conditions for objective and standardised telephone testing. These products combine the requirements for acoustical performance with those for practical use. Ear and Mouth Simulators Types 4185, 4195 and 4227 are for use in Telephone Test Head Type 4602B.

Ear Simulator Type 4185

Ear Simulator Type 4185 is designed for telephone measurements requiring an IEC318 coupler. This is suitable for measurements on high impedance earphones where sealed conditions are required.

Features:

• Conforms to IEC318 and ITU-T P.51 Type 1
• Built-in sound source for seal checking
• ½" microphone and preamplifier included 
• Individually calibrated (in accordance with ITU-T P.57)

Wideband Ear Simulator Type 4195

Wideband Ear Simulator Type 4195 has been designed to match the ear simulators in Head and Torso Simulator Type 4128C for measurements on telephone handsets. Type 4195 therefore provides a very realistic acoustical load to the telephone handset being tested and easily shows acoustic differences between telephone handsets as they appear in real use. This feature is vital when designing telephone handsets optimised for improved sound quality.

Features:

• Conforms to ITU-T P.51 Type 3.2
• Provide realistic acoustic load (both high and low leak versions)
• ½" microphone and preamplifier included 
• Individually calibrated (in accordance with ITU-T P.57)

Mouth Simulator Type 4227

Mouth Simulator Type 4227 is an accurate reference sound source developed for near field testing of telephone transmitters and microphones. It provides a standardised and realistic simulation of the human voice field.

Features:

• Conforms to IEEE-269, IEEE-661 and ITU-T P.51.
• Accurate level and frequency response calibration is easily done using a Brüel & Kjær ½" microphone placed in the supplied calibration jig
• Accurate simulation of human voice field
• Quality control testing of frequency response and distortion of telephone transmitters and close-talking microphones
• Continuous SPL of 100dB 25mm from lip ring
• Low distortion
• Built-in overload protection circuit