Uses • In-vehicle NVH recordings using Sonoscout™ System Type 3663 • Recording vehicle noise for sound quality evaluation and testing • Recording noise from domestic appliances, office equipment, etc., for sound quality optimisation • Recording noise from sub-suppliers' products and components to evaluate and optimise their sound quality • Evaluation of headphones/hearing protectors where a blocked ear canal is desired • Binaural sound and music recording Features • Directivity optimised for sound-image localisation • Type 4100 includes Preamplifier Type 2669-L with CIC facility • Type 4100-D includes CCLD Preamplifier Type 2671 • High sensitivity, low noise, free-field microphones • IEEE P1451.4-capable transducers with Transducer Electronic Data Sheet (TEDS) • Manikin with surfaces and pinnae modelling the geometry of the average adult head and torso • ITU-T compliance with the acoustic requirements of ITU-T Rec. P.58, IEC 60318-7 and ANSI S3.36-1985, except for exclusion of the ear canal • Adjustable neck angle • Accredited calibration available Description Sound Quality Head and Torso Simulators Types 4100 and 4100-D are manikins designed for sound quality testing. Two microphones, positioned at the entrances to the ear canals on the manikin's head, simulate the spatial separation from ear to ear of a human head and ensure a signal that includes the interference patterns caused by the head and upper body. This gives an extremely accurate three-dimensional recording. Two moulded-silicone pinna simulators encase the microphones to provide directivity patterns similar to the human ear. The simulator has a sound-dampening fabric cover which slips easily over the manikin's neck. This assists in changing the reflections from the body and shoulders to obtain the correct directivity. The HATS Car Seat Fixture WA-1647 ensures that the simulator is in the correct position in the seat and the position of the head can also be adjusted by turning the neck ring so that the head looks straight forward, or slightly down at an angle of 17°. Microphones are easily installed or removed by screwing or unscrewing them from the ear cavities. Types 4100 and 4100-D contain IEEE P1451.4-capable transducers with standardised TEDS. This feature allows automatic front-end and analyzer setup, based on information stored in the transducer. This information includes, for example, sensitivity, serial number, manufacturer and calibration date. Sound Quality The sound quality of the noise from a product, as perceived by a human being, is an increasingly important factor when assessing the total quality of the product. This applies to all forms of transport: vehicles, aircraft, trains and ships. Household and office machinery products are also increasingly subject to the optimisation of their sound quality. Sub-suppliers of products and components to the above-mentioned industries are often required to include an acceptable sound quality as a part of the product specifications.

Subjective Listening Tests The final evaluation of the sound quality of a product is normally made using a selected group of people - a jury in a listening test. To have the jury listen to the sound in reality, for example each jury member driving a car and then reporting on the sound quality, is very time-consuming and costly. To overcome this, Type 4100 can be used to make a high-quality binaural recording of the product's noise, which can be saved to a mobile device or PC. This can then be simultaneously presented to all members of the jury off-site. To avoid bias errors in this process, it...