📖 Audio Glossary

Transfer Function

Mathematical representation of how a system alters magnitude and phase of signals passing through — central to filter and correction design.

A transfer function H(f) describes the output of a system for any input at frequency f. It has two components: magnitude (how much the amplitude changes) and phase (how much the timing shifts). The goal of room correction is to measure the room+speaker transfer function and design an inverse filter that makes the total transfer function flat.

Transfer functions are measured by comparing the input signal (sine sweep, pink noise, or impulse) to the recorded output. The difference is the transfer function. Modern measurement software (Room EQ Wizard, ARTA, SMAART) automates this process.

Related Terms

Impulse Response (IR)A measurement capturing how a room or device responds to an extremely short, sharp sound — contains frequency, phase, and decay information.Correction FilterA custom EQ and phase adjustment derived from room measurements — applied in real-time to counteract room and speaker coloration.Room CorrectionUsing digital analysis and filtering to compensate for acoustic problems caused by room resonances and speaker placement.
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