| 摘要 |
The de-emphasis function of an FM audio system is provided by impedance of the sound reproduction components, including an audio output transformer, is present, and the speaker. The high frequency rolloff of these impedance devices can provide complete FM de- emphasis by using an audio output transformer with selected leakage inductance and a speaker with a selected voice coil impedance. If the inductances of the components are insufficient to provide the full amount of compensating rolloff, the remaining portion of the de- emphasis can be provided by a partial deemphasis circuit (R1-C-R2) coupled between the FM detector and the transformer or speaker.
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