sampling rate

Thân thiện

An engineer adjusts the sampling rate on a digital audio workstation.

Definition

Noun: - (Telecommunications, Signal Processing): The number of times per second (or per another unit of time) that an analog signal is measured (sampled) to convert it into a digital form. It is expressed in samples per second, or hertz (Hz). A higher sampling rate allows for a more accurate digital representation of the original analog signal.

Usage

The term "sampling rate" specifies the temporal density of samples taken from a continuous signal. - It is a critical parameter in audio digitization (e.g., CD audio uses a 44.1 kHz rate) and in analog-to-digital conversion (ADC) for various signals. - It is often discussed alongside "bit depth," which determines the precision of each sample.

Examples

• Noun:
  • The standard sampling rate for audio CDs is 44,100 Hz.
  • To accurately capture high-frequency sounds, you need a high sampling rate.
  • The engineer adjusted the sampling rate of the data acquisition system to 1000 samples per second.

Advanced Usage

• Nyquist-Shannon Sampling Theorem: This fundamental theorem states that to perfectly reconstruct a signal, the sampling rate must be at least twice the highest frequency present in the signal. This minimum rate is called the Nyquist rate.
  • If you want to digitize a signal containing frequencies up to 20 kHz, you must use a sampling rate of at least 40 kHz.

Variants and Related Words

• Sample (verb/noun): The act of taking a measurement at a point in time, or the measured value itself.
  • The device samples the voltage 1000 times a second.
• Sampling Frequency: A synonym for "sampling rate."
• Nyquist Rate: The minimum sampling rate required to avoid aliasing, equal to twice the maximum signal frequency.
• Bit Rate: Often confused with sampling rate. Bit rate refers to the number of bits processed per unit of time (e.g., kilobits per second), which depends on both the sampling rate and the bit depth.

Synonyms

• Sampling Frequency

Related Phrases and Concepts

• Aliasing: A distortion effect that occurs when a signal is sampled at a rate lower than the Nyquist rate, causing high frequencies to appear as lower frequencies.
  • A low sampling rate can cause aliasing in the digital audio.
• Analog-to-Digital Converter (ADC): The hardware component that performs sampling at a specified rate.
• Digital Audio Workstation (DAW): Software where users typically configure the project's sampling rate.

Học thuật

Noun

1. (telecommunication) the frequency of sampling per unit time