A technology that applies to the lowest frequency range. For example, the radio band from 30 to 300 kHz frequency range, said low frequency; electronic amplification circuit, will be close to the audio (20 Hz ~ 20,000 Hz) frequency is called frequency.
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dī pín
Close to the most low-frequency radio spectrum frequency domain
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No. 3
[Sound]: low-frequency part of the audible sound signals or for this part of the channel, for example, frequency components below 250 Hz