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Computer Hardware Engineer

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AVG. SALARY

$114,180

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EDUCATION

Bachelor's degree

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JOB OUTLOOK

Stable

Real-Life Activities

Real-Life Math

You are a computer hardware engineer. You are trying to get a computer to demodulate, or decode, an encoded wireless signal. The central processing unit (CPU) of the computer is running at 29.4912 MHz. The signal is 7.8125 kHz.

The rate of the sampling needs to be significantly larger than the rate of the signal being sampled, so you are going to sample the signal at 6X. That means the frequency of your signal sample is 7.8125 x 6 = 46.875 kHz.

1) You need to convert all of your units to Hz. If there are 1 million Hz in a MHz and 1,000 Hz in a kHz, what are your final values?

2) You are using a timer interrupt, a device that lets you pause the normal sequence of events taking place at precisely timed intervals. The timer needs to be set to the number of CPU cycles between each signal sample.

How many cycles does the CPU have between each time the signal is sampled?

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