Intercarrier sound detector with gain and self-limiting properties using one switch device
P. H. Van Anrooy · IEEE Transactions on Broadcast and Television Receivers · 1964
As Giacoletto stated in the summary of a paper (1): "A parallel tuned circuit periodically connected to a source of linear direct current energy is fundamental to a large group of energy conversion circuits." (1) (R.C.A. Review Vol. XIII 1952: "Parallel Tuned Circuit Periodically Switched to Direct Current Source")