Products

Type 4958 is a ¼” prepolarized microphone suited for use in systems requiring a large number of microphones, for example, beamforming arrays, STSF measurements, and non-stationary STSF measurements. These microphones have excellent amplitude and phase-matching over wide ranges of temperature and humidity.

USE SCENARIOS

• Measurements using:– Spatial Transformation of Sound Fields (STSF) Type 7688– Non-stationary STSF Type 7712– Beamforming Type 7768
• Hand-held array measurements
• Simultaneous recording of time signals in medium to large microphone arrays, for example, simulated pass-by measurements
• Cost-effective, in-car measurements

The TEDS (Transducer Electronic Data Sheet) contains information about the complex transfer function, hence enabling applications to calculate corrections for the individual transducer, resulting in more precise measurements. The microphone preamplifier is of the industry standard CCLD (constant current line drive) type allowing the use of only one cheap coaxial cable for signal, power supply, and TEDS.

A rugged protection grid provides an integrated heat shield. The microphone is front-vented for pressure equalization.

Type 4958 is a precision array microphone offering extended TEDS and excellent phase matching and amplitude linearity over a wider frequency range compared to Type 4957.

Capacitance: pF

Diameter: ¼

Dynamic range: 28 – 140 dB

Frequency range: 10 – 20000 Hz

Inherent noise: 28 dB A

Lower limiting frequency -3dB: Hz

Optimised: Array

Polarization: Prepolarized

Polarization voltages: 0 V

Pressure coefficient: dB/kPa

Sensitivity: 11.2 mV/Pa

TEDS UTID: 127-0-0-1U

Temperature coefficient: db/ºC

Temperature range: -10 – 55 C

Venting: Front

Weight: 3.8 gram

Sound field: Special

Input type: CCLD IEPE

Microphone type: Array