US physics ch. 16

Dynamic range

method of reporting how much a signal can vary and still be accurate and measurable

dynamic range units

~dB
-ratio/comparison

dynamic range relative measurement of

largest to smallest signals

dynamic range of info (signals) _________ the more it is processed

decreases

to calculate dynamic range you need

a voltage ratio or amplitude ratio

dynamic range calculation

-divide bigger voltage by smaller voltage: 100/1=100
-count zeros
-each zero= 20dB of dynamic range

Voltage ratio of 1,000,000 : 1
How many decibels of dynamic range?

120dB

The receiver can process voltages ranging from 3 mV to 3000 mV, what is the dynamic range?

60dB

If the dynamic range of one component is narrower than that of another...

problems arise

letter grades are __________; have a ________ point range

compressed; lesser

An uncompressed signal in receiver has a dynamic range of 110 dB. Signal undergoes 40 dB of compression. What is the dynamic range of the compressed signal?

-subtract
-110 dB - 40 dB = 70 dB

After compression, a signal has a dynamic range of 70 dB. The original signal was compressed by 40 dB. What is the dynamic range of the original uncompressed signal?

-add
-70 dB + 40 dB = 110 dB

number of choices;

number of possible shades of gray

narrow dynamic range

-fewer shades of gray
-bistable, narrowest

wide dynamic range

-many shades of gray
-considered as low contrast

wide dynamic range has more or less shades of gray

more

high contrast has more or less shades of gray

less

bistable display has more or less shades of gray

less

few choices has more or less shades of gray

less

narrow dynamic range has more or less shades of gray

less

low contrast has more or less shades of gray

more

An uncompressed signal in the receiver of 140 dB is compressed 40 dB in order to move accurately into the DA converter. 100dB
What is the dynamic range of the signal in the DA converter?

40dB

How many shades of gray can be represented by a group of 4 bits?

16