Frekvensåtergivning

Frekvensåtergivning, often translated as frequency response, describes how accurately a system reproduces different frequencies within its operating range. In audio systems, this refers to how a loudspeaker, amplifier, or recording device reproduces sound at various pitches. A perfectly flat frequency response would mean all frequencies are reproduced at the same volume level. However, real-world systems have deviations.

The frequency response is typically measured and represented graphically, with frequency on the horizontal axis (usually in Hertz, Hz) and amplitude or level on the vertical axis (often in decibels, dB). A "good" frequency response is subjective and depends on the application. For critical listening, a relatively flat response is often desired to hear the audio as it was intended. However, for consumer products, manufacturers might intentionally shape the frequency response to enhance certain characteristics, such as boosting bass for a more powerful sound.

In fields beyond audio, frequency response can also describe the behavior of other systems. For example, in optics, it can refer to how a lens transmits or reflects different wavelengths of light. In control systems, it indicates how a system reacts to sinusoidal inputs of varying frequencies, which is crucial for stability analysis. Understanding frequency response is essential for designing and evaluating systems that process or transmit signals across a range of frequencies.