narrowband

/ˈnɛroʊˌbænd/
adjective
  1. Relating to a communication system or signal that uses a narrow range of frequencies, typically used for voice or low-speed data transmission.
    • Some radio stations still broadcast in narrowband to save spectrum space.
    • The old telephone system used narrowband signals for voice calls.
    • Narrowband internet connections are much slower than broadband.
Antonyms
noun
  1. A narrow range of frequencies used for transmitting data or signals.
    • The device operates on a narrowband to avoid overlapping with other channels.
    • Switching from narrowband to broadband improved the network speed dramatically.
    • Engineers measured the narrowband of the radio signal to check for interference.
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