# Can anyone help me with the following ex?(its about freequencies)

1. Feb 1, 2006

### dizzzzy23

this is the ex:
What is the frequency in Hertz (cycles per second) of a signal that repeats 40,000 times within one minute? What is the period of the signal? (10 points)

i think the baud rate is 666.66
the same i the bit rate 666.66 in (ASK) Amplitude shift Keying.

I know that in (ASK) frequency and phase remain constant while only the amplitude change.

But i don't Know how to calculate the frequency and the phase.

can anybody help me?

2. Feb 1, 2006

### cepheid

Staff Emeritus
The frequency is defined as the number of cycles per second. 40 000 times per minute is how many cycles per second? A trivial calculation, no?

The period is the time per cycle, which, as I'm sure you can see, is the reciprocal of the frequency.

What does all this stuff about baud rate and bit rate have to do with anything, by the way?

3. Feb 1, 2006

### dizzzzy23

you said that the frequency is 40000/60=666.66??

4. Feb 1, 2006

### cepheid

Staff Emeritus
Nope, you said that. But that is correct, and hopefully is based on the hint I gave. I mean, if you have 40 000 cycles in a minute, a second is only one sixtieth of that time interval, so it stands to reason that in a second you have only one sixtieth the number of cycles. I hope that clears up why your calculation is correct.

5. Feb 1, 2006

### dizzzzy23

ok thanks

and the period is T=1/666.66 = 0.001SEC
IS THAT TRUE?

THANKS AGAIN