Io direi che sarebbe il caso di studiare le Nordig Requirements che indicano ai produttori come deve interagire l'indicazione di segnale rispetto al segnale di ingresso:
3.4.4.6 Requirements for the signal strength indicator (SSI)
The terrestrial NorDig IRD shall be provided with a signal strength indicator (SSI). The value for the SSI shall be referred to the IRD RF signal input.
The terrestrial NorDig IRD shall be able to determine signal strength within a range starting from 15 dB lower than the reference signal level defined in Table 3.6 and up to 35dB above that value or maximum signal input level defined in section 3.4.10.5.
The absolute accuracy shall be ±5 dB at RF signal input levels -80 dBm to -60 dBm and ±7 dB for RF signal input levels higher than -60 dBm.
The relative accuracy should be ±3 dB between centre frequencies within one frequency band, e.g. VHF Band III or UHF Band IV/V, supported by the receiver.
The signal strength indicator shall have a relative value within a range from 0% to 100% and with a resolution of 1%. The signal strength indicator shall be updated regularly once per second.
The formulas to calculate the signal strength indicator (SSI) value in [%] are defined below.
See also Annex E: Implementation Guidelines for best service selection in automatic channel search
SSI = 0 if Prel < -15dB
SSI = (2/3) * (Prel + 15) if -15 dB ≤ Prel < 0dB
SSI = 4 * Prel + 10 if 0 dB ≤ Prel < 20 dB
SSI = (2/3) * (Prel - 20) + 90 if 20 dB ≤ Prel < 35 dB
SSI = 100 if Prel ≥ 35 dB
where
Prel = Prec - Pref
Prec is referred to signal level expressed in [dBm] at receiver RF signal input.
Pref is reference signal level value expressed in [dBm] specified in Table 3.6 for DVB-T and in
Table 3.7for DVB-T2.
La prima release delle Nordig Requirements risalgono a maggio 1998 e Nella NorDig partecipano come associati o partner i principali produttori di ricevitori TV tra i quali:
ASSOCIATED:
Philips
https://www.philips.com
Vestel
http://www.vestel.com/
PARTNERS:
C More
http://www.cmore.se/
Digital TV Labs
http://www.eurofins-digitaltesting.com/
Dolby
http://www.dolby.com/us/en/index.html
Fraunhofer
http://www.fraunhofer.de/
June
http://www.june.se/
Levira
http://www.levira.ee/en/
LG
http://www.lg.com/dk
MTV
http://www.musictelevision.fi/
Panasonic
http://www.panasonic.eu/
Samsung
http://www.samsung.com
Silema
http://www.silema.se/
Sofiadigital
https://sofiadigital.com/
Sony
http://www.sony.com/
TPVision
http://www.tpvision.com/
Viaplay
http://viaplay.se/