base frequency

base frequency

A tuning fork vibrates at its base frequency.

Definition
  1. Noun:
    • Physics: "base frequency" refers to the fundamental frequency of a vibrating system, such as a string, air column, or electronic circuit. It is the lowest frequency at which the system naturally oscillates, often called the first harmonic or fundamental frequency.
Usage Examples
  • Noun:
    • In a guitar string, the base frequency determines the pitch of the note you hear. (The lowest natural vibration frequency sets the musical tone.)
    • The base frequency of the AC power supply is 50 or 60 hertz, depending on the country. (The standard oscillation rate of electrical current.)
Advanced Usage

  • "base frequency" vs. "harmonic frequency": The base frequency is the first and lowest harmonic; all other harmonics (overtones) are integer multiples of it.

    • The base frequency of a tuning fork is 440 Hz, and its second harmonic is 880 Hz. (440 Hz is the fundamental; 880 Hz is the first overtone.)

  • "base frequency" in signal processing: It can refer to the carrier frequency of a modulated signal, before any modulation is applied.

    • The radio transmitter's base frequency is 100 MHz, onto which the audio signal is added. (The unmodulated carrier wave.)
Variants and Related Words

  • Fundamental frequency (n): a synonym for base frequency, especially in acoustics and music.

    • The fundamental frequency of a violin string changes when you press it against the fingerboard. (The lowest natural pitch.)

  • Baseband (adj/n): a term in telecommunications referring to a signal at its original base frequency, without modulation.

    • Baseband transmission sends digital data directly at the base frequency. (Unmodulated signal.)
Synonyms
  • Fundamental frequency: the lowest frequency in a periodic waveform.
  • First harmonic: the simplest and lowest-frequency component of a complex wave.
  • Natural frequency: the frequency at which a system oscillates when disturbed (often used in mechanical contexts).
Related Idioms
  • Hit the base frequency: an informal phrase used in electronics or music to mean achieving the correct fundamental pitch or oscillation.
    • The engineer adjusted the circuit until it hit the base frequency of 60 Hz. (Achieved the desired fundamental oscillation.)