Difference between revisions of "Audio with PWM"
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| − | It is possible to generate sound with the | + | It is possible to generate sound with the APFxxx boards without any sound chip, just by using the PWM output and the i.MX possibilities: |
[[Image:AudioWithPWM.png]] | [[Image:AudioWithPWM.png]] | ||
==Quality== | ==Quality== | ||
| − | + | Sound quality produced is low (8bits @ 8, 16 or 32KHz) but very sufficient to reproduce voice or small sounds. | |
PWM activation/deactivation is generating "clac" each time you play a sound (for the moment) but using some electronic filters or playing "blank noise" could solve the problem. | PWM activation/deactivation is generating "clac" each time you play a sound (for the moment) but using some electronic filters or playing "blank noise" could solve the problem. | ||
| + | |||
| + | ==Linux driver== | ||
| + | * [[PWM|Armadeus PWM driver]] | ||
==Links== | ==Links== | ||
| − | + | * http://www.fpga4fun.com/PWM_DAC.html FPGA PWM IP | |
| − | * http://www.fpga4fun.com/PWM_DAC.html | + | |
| + | [[Category:Audio]] | ||
Latest revision as of 13:57, 15 August 2010
It is possible to generate sound with the APFxxx boards without any sound chip, just by using the PWM output and the i.MX possibilities:
Quality
Sound quality produced is low (8bits @ 8, 16 or 32KHz) but very sufficient to reproduce voice or small sounds. PWM activation/deactivation is generating "clac" each time you play a sound (for the moment) but using some electronic filters or playing "blank noise" could solve the problem.
Linux driver
Links
- http://www.fpga4fun.com/PWM_DAC.html FPGA PWM IP
