| 摘要 |
<p>Pre-amplifier circuitry providing noise reduction, comprising an operational amplifier in combination with capacitative/resistive tuned circuits, with component values selected, not to provide a flat response over the entire audio frequency range, but to adjust the gain of predetermined ranges within the range of frequencies emanating from a source of sound, such as an RIAA recording or a tape, to compensate for deficiencies of the source and/or downstream equipment.</p> |
