practice

1. A 32.83 ms fragment of the EBS alert tone is shown in the oscilloscope display below. (The full tone lasts 22.5 seconds.) The beat structure is plainly visible at this scale. There are approximately 3.5 cycles of the beat and 29.75 cycles of the carrier visible in the display window. Determine the frequencies of the two tones used to produce the alert.
   
   
   
   
2. Write something else.
3. Write something different.
4. Write something completely different.

numerical

1. The telephone "off the hook" warning in the United States is composed of four pure tones: 1400, 2060, 2450, and 2600 Hz.
   1. How many beat frequencies are present in this combination?
   2. What are the beat frequencies?