| 摘要 |
In front of the delay connection (T) in the memory circuit is connected a primary mixer (BL1) which mixes the circulating signal with that froma0from a frequency-modulated local oscillator (L0). A band pass filter (BP2) allows passage only to the required mixture result, and a summator (D3) partly couples the mixture result, partly the local oscillator signal to the delay connection (T). Behind the delay connection is connected an effect distributor (D4) with two outlets, and behind each outlet is a band pass filter (BP3, PB4). One of the two band pass filters (BP3) allows passage to the circulating signal, and the other BP4) to the local oscillator signal. A secondary mixer (BP1) mixes the two signals, and a band pass filter only permits passage to the required mixture result, i.e. a signal of the original frequency. |
