Other Parts Discussed in Thread: OMAPL138
Hi,
I would like to ask a question on OMAP L138 audio.
I read from Basics of Embedded Audio Processing that:
So far, we’ve only talked about digital PCM representation and the audio DACs used to get those digital signals to the analog domain. But there is a way to use a different kind of modulation, called pulse-width modulation (PWM), to drive an output circuit directly without any need for a DAC, when a low-cost solution is required.
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To make PWM audio achieve decent quality, the PWM carrier frequency should be at least 12 times the bandwidth of the signal, and the resolution of the timer (i.e., granularity of the duty cycle) should be 16 bits. Because of the carrier frequency requirement, traditional PWM audio circuits were used for low-bandwidth audio, like subwoofers. However, with today’s high-speed processors, it’s possible to carry a larger audible spectrum.
Can OMAPL138's eHRPWM be used for this purpose? Is there any example, tutorial or Wiki article about this?
Zheng
