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The Ultra Cool Stereo PWM Audio

When someone mentions about the Stereo PWM Audio, what’s crossing in your mind? Well, some of you here might be properly think, “Nothing much, as it must be another ordinary Stereo PWM Audio”. Well, believe it or not, this ultra cool Stereo PWM Audio is totally different from the other. Before that, how well are you know about the PWM? For your information, PWM is the short acronym of “Pulse Width Modulation”. It’s a modulation technique, which is being used to generate variable-width pulses to represent the amplitude of an analog input signal. Normally, PWM is widely used in the common “switch-mode” power supplies, as a powerful converter to convert AC power to DC for computers. Furthermore, it can be used to control the speed of a DC motor and the brightness of a bulb. Some people were imagined, if it possible to use the PWM from a simple micro-controller for duplicating complex sounds? Well, it’s possible, especially when it’s a stereo PWM audio! In most of the time, PWM is a very useful method, as it used in audio… Continue reading

The Most Interesting Stereo PWM Audio!

You must be wondered, “Can PWM from a simple micro-controller duplicate complex sounds?” Well, if you have thought it before, then you’re very lucky, as you’re about to find out the truth by yourself! Do you believe that by using a PWM channel of a simple microcontroller, a capacitor and a resistor, you can duplicate sounds on the fly? And, isn’t it even better, if you can have your micro play-back complex things over audio for an extremely low cost? Ok, let’s cut the long story short and getting straight into the main topic! For this project, an AVR Mega series microcontroller will be used to control the whole system. It transfers the stereo file 161828 baud (64 kbps of actual radio), where the RC filters is already set at a breakpoint of about 8khz. Since it’s a stereo type, thus two RC filters are needed in this project! You might found out another interesting thing here. Although the sound can be easily recognizable, but its not MP3 quality at all! By the way, with this Stereo PWM audio, you… Continue reading