a These levels are based on Estimated Energy Requirements (EER) from the Institute of Medicine Dietary Reference Intakes macronutrients report, 2002, calculated by gender, age, and activity level for reference-sized individuals.
The definition of a channel is a waterway, a means of communication and a specific television or radio frequency. An example of channel is the English Channel. An example of channel is writing. An example of channel is Fox News.
Re: what does audio channel really mean? A channel is something through which data(in the form of electro magnetic data or electric current or other wave) signal travels from source to destination. Physically a audio channel can be said as a simple wire through which electrical signal is propagated. This signal is analog in nature and contain many frequencies. In the case of sterio audio we have two channels. A sterio audio is recorded by using two different micro phones. So we have to set of data.