In an audio circuit, what is the typical frequency range that defines audio signals?

The typical frequency range that defines audio signals, which humans can typically hear, is from about 20 Hz to 20,000 Hz (20 kHz). This range encompasses the frequencies that the average human ear can detect.

The chosen answer indicates a range from 20 Hz to 15,000 Hz, which partially covers the lower end of the audible range but does not extend far enough into the upper frequencies. On the other hand, other answer options represent ranges that either fall entirely outside the typical audio frequency range or do not fully encompass the audible limits recognized in audio engineering.

To accurately represent audio signals, the frequency range should ideally be from 20 Hz to 20 kHz, thus encompassing all fundamental sounds that can be perceived by the human ear. It's important for technicians and audio professionals to understand this standard range when designing and evaluating audio equipment.