Superheterodyne

Japanese: スーパーヘテロダイン

A method of receiving radio waves. The received high frequency is first converted to an intermediate frequency, amplified, and then detected to obtain a signal current for audio and video. For this purpose, the receiver is equipped with a local oscillator, which generates a high frequency current that is superimposed on the received high frequency, and the difference between the two frequencies is extracted as an intermediate frequency using the beat. In this case, a tuning circuit and local oscillator are linked to obtain a constant intermediate frequency (for example, 455 kHz for radio) for any received frequency. Since amplification is performed within a constant and narrow wavelength range, it is stable and has good sensitivity and selectivity.
→ Related topics Armstrong | Beat | Frequency conversion | Intermediate frequency | Radio

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

電波の受信方式の一つ。受信した高周波をいったん中間周波数に交換し，増幅した後，検波して音声や映像の信号電流を得る。このため受信機に局部発振器を備え，これより発生した高周波電流を受信高周波に重ね，うなりを利用し両周波数の差を中間周波数としてとり出す。この際同調回路と局部発振器を連動させてどの受信周波数に対しても一定の中間周波数（たとえばラジオでは455kHz）が得られるようにする。一定のしかも狭い波長範囲で増幅が行われるため安定で感度や選択性もよい。
→関連項目アームストロング｜唸り｜周波数変換｜中間周波数｜ラジオ

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