Audio with PWM: Difference between revisions
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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 14:57, 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
