Acoustics is the branch of physics that deals with the production, propagation, and reception of sound waves.

A loudspeaker is a transducer that converts electrical signals into sound waves by vibrating a diaphragm.

The frequency range of human hearing is generally considered to be from 20 Hz to 20 kHz.

The speed of sound in air at room temperature is approximately 343 meters per second.

Filtering is a signal processing technique used to remove unwanted noise from a signal by selectively passing or rejecting certain frequencies.

Digitization is the process of converting an analog signal into a digital signal by sampling, quantizing, and encoding the signal.

A low-pass filter is a type of digital filter used to remove high-frequency noise from a signal by allowing only low-frequency components to pass through.

Reconstruction is the process of converting a digital signal back into an analog signal by interpolating the sampled values.

Feature extraction is a signal processing technique used to extract specific features from a signal that are relevant for a particular task, such as classification or pattern recognition.

Signal mixing is the process of combining two or more signals into a single signal by adding or multiplying them together.

Data compression is a signal processing technique used to reduce the redundancy in a signal by removing unnecessary information.

Modulation is the process of transmitting a signal over a communication channel by varying one or more of its characteristics, such as amplitude, frequency, or phase.

Amplitude shift keying (ASK) is a type of modulation technique used to transmit digital data over an analog channel by varying the amplitude of the carrier signal.

Demodulation is the process of recovering the original signal from a modulated signal by reversing the modulation process.

Noise reduction is a signal processing technique used to enhance the quality of a signal by removing unwanted noise.