Definition

1. Noun:
   • Low frequency: In physics and electronics, "hạ tần" refers to a low-frequency signal or wave, typically within the range of sound frequencies audible to humans (approximately 20 Hz to 20,000 Hz). It is often contrasted with "cao tần" (high frequency).
   • Lower band: In telecommunications and broadcasting, it can refer to the lower part of a frequency band.

Usage Examples

• Noun:
  • Âm thanh mà tai người nghe được nằm trong dải hạ tần. (The sound audible to the human ear lies within the low-frequency band.)
  • Tín hiệu hạ tần cần được khuếch đại trước khi phát. (The low-frequency signal needs to be amplified before broadcasting.)
  • Đài phát thanh này phát sóng ở băng tần hạ tần. (This radio station broadcasts on the low-frequency band.)

Advanced Usage

• Technical Context: In audio engineering, "hạ tần" is crucial for reproducing bass sounds. Speakers called "loa hạ tần" (low-frequency speakers or woofers) are specifically designed to handle these frequencies.
  • Hệ thống âm thanh cần loa hạ tần để tái tạo âm trầm. (The sound system needs a low-frequency speaker to reproduce bass.)

Variants and Related Words

• Tần số (n): Frequency.
• Cao tần (n): High frequency.
• Âm tần (n): Audio frequency (often synonymous with "hạ tần" in audio contexts).
• Trung tần (n): Intermediate frequency.
• Loa siêu trầm / loa sub (n): Subwoofer (a type of speaker for very low frequencies).

Synonyms

• Tần số thấp: Low frequency (direct synonym).
• Âm tần: Audio frequency (in specific contexts).

Related Phrases (Compound Terms)

• Bộ khuếch đại hạ tần (n): Low-frequency amplifier.
• Dải hạ tần (n): Low-frequency range/band.
• Lọc hạ tần (n): Low-pass filter (a device that allows low frequencies to pass through).
• Sóng hạ tần (n): Low-frequency wave.

1. Low-frequency