Patent ID: 11937094
Assignee: CABLE TELEVISION LABORATORIES, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. The method of claim 1, the SEM being a double-interior-non-transmitted-channel SEM defined for a first frequency, a second frequency, a third frequency, a fourth frequency, a fifth frequency, and a sixth frequency; wherein:
a first attenuation includes 0 dBr at the first frequency and −20 dBr at the second frequency, the second frequency being 1 MHz or greater than the first frequency;
a second attenuation includes −20 dBr at the second frequency and between and including −20 dBr to −25 dBr at the third frequency, the third frequency being at least 10 MHz greater than the first frequency;
a third attenuation delta includes between and including −20 dBr to −25 dBr at the fourth frequency and −20 dBr at the fifth frequency, the fifth frequency being at least 39 MHz greater than the first frequency; and
a fourth attenuation delta from −20 dBr to 0 dBr between the fifth frequency and the sixth frequency, the sixth frequency greater than the fifth frequency.