Linear Model - Additive Noise Channel

[bmchesney@yahoo.com]

Greetings,

I am requesting clarification and assistance from the scientific
community, if anyone can offer it, on Hioki's, "Telecommunications"
Fourth Edition.

If you have a copy of the text, you will have noticed many of the errors,
most notably the editors did not catch an error with Ohms law and Joules
law on page 12. After that, my confidence in this text was shot, but I
am stuck with it for class.

My question is regarding the use of the linear model for Signal out and
Noise out Chapter 2.2.3, example 2.11 page 17.

Hioki (and my instructor) have stated that Signal is the combination of
the intelligence and noise such that.

So = Signal Out
Si = Signal In
No = Noise Out
Ni = Noise In
Ap = Amplification
Nr = Noise added by the equipment such as an amplifier

No = Ni * Ap + Nr
So = Si * Ap

However, it seems odd that the formula for No is not applied to So. Hioki
left off the Nr. Now if Signal includes the Noise, this does not make
sense.

Please provide explanation if Hioki is correct. Either way, please
provide references to a text I can use to further clarify the situation
as this text has absolutely no credibility at this point.

Thank-you,
Brian