SEm/escapeLab/signal generator
From FSI
(Difference between revisions)
Axel.amand (Talk | contribs) (Created page with "{{TOC right}} <div class="center" style="width: auto; margin-left: auto; margin-right: auto; font-size:2em"> Welcome to the SEM escape lab </div> <div class="center" style="...") |
Axel.amand (Talk | contribs) (→Specifications) |
||
| (3 intermediate revisions by one user not shown) | |||
| Line 17: | Line 17: | ||
= Specifications = | = Specifications = | ||
| − | 4 | + | 4 sinewaves are combined to build a signal: |
| − | + | * the frequency of the second one is the double of the first one's. | |
| + | * the frequency of the third one is the double of the second one's. | ||
| + | * the frequency of the fourth one is the double of the third one's. | ||
| + | |||
| + | Each sinewave is damped by a power of 2 : | ||
| + | in terms of hardware, the signal values are shifted to the right by a given number of bits. | ||
| + | The damped sinewaves are then added together to form the signal at the bottom of the following picture. | ||
| + | |||
| + | [[File:Escape sinewave sum.png|center|500px]] | ||
| + | |||
| + | Damping factors can either be 1, 1/2 and 1/256. | ||
| + | The key is the modulo 30 sum of: | ||
| + | * the power of two of the first coefficient (0 for 1, 1 for 1/2 and 8 for 1/256) | ||
| + | * two times the power of two of the second coefficient | ||
| + | * three times the power of two of the third coefficient | ||
| + | * four times the power of two of the fourth coefficient | ||
| + | |||
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> | <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> | ||
| + | <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> | ||
| + | |||
PS: 1st coefficient is 0 | PS: 1st coefficient is 0 | ||
| + | |||
[[Category:Bachelor]] [[Category:SEm]] [[Category:EscapeLab]] | [[Category:Bachelor]] [[Category:SEm]] [[Category:EscapeLab]] | ||
Latest revision as of 17:40, 5 May 2022
|
Welcome to the SEM escape lab
5th and last Key
Matching the waves
Find the coefficients and match the signal.
Specifications
4 sinewaves are combined to build a signal:
- the frequency of the second one is the double of the first one's.
- the frequency of the third one is the double of the second one's.
- the frequency of the fourth one is the double of the third one's.
Each sinewave is damped by a power of 2 : in terms of hardware, the signal values are shifted to the right by a given number of bits. The damped sinewaves are then added together to form the signal at the bottom of the following picture.
Damping factors can either be 1, 1/2 and 1/256. The key is the modulo 30 sum of:
- the power of two of the first coefficient (0 for 1, 1 for 1/2 and 8 for 1/256)
- two times the power of two of the second coefficient
- three times the power of two of the third coefficient
- four times the power of two of the fourth coefficient
PS: 1st coefficient is 0
