Directly from the car battery / the existing car radio supply. As I integrated a Class-D amplifier instead of a Class-AB which is normally built-into existing car radios, I can get more audio output power from the same current consumption, e.g. a 10A current supply will give me ~120W audio output power, a 15A current supply up to 175W. But remember: Normally you don't need these high output power for a longer period (nobody listens to white noise or sinewaves for a longer period of time) - music is normally 10 times lower in terms of energy density.
Am Mittwoch, 4. Dezember 2013 18:27:43 UTC schrieb lisarden: > > Sebastian how do you feed the analog amplifier? 150W is damn a lot > 04 дек. 2013 г. 20:27 пользователь "cmicali" > <[email protected]<javascript:>> > написал: > >> Very cool project sebastian - would definitely be interested in >> purchasing a cape and checkout out the firmware. >> >> -c >> >> >> On Tuesday, December 3, 2013 3:39:20 PM UTC-5, Sebastian Wendt wrote: >>> >>> Hello everybody, >>> >>> I have just received first sample boards of my CarStreamer cape for >>> Beaglebone. >>> CarStreamer includes: >>> >>> 4x50W(RMS) Class-D Audio Amplifier (FDA450) connected to McASP0 and I2C >>> Stereo Audio Codec with 2x LineOut, 2x LineIn and 1x Mic In >>> (TLV320AIC3104) >>> FM/DAB receiver circuit (with RDS support, ...) connected to McASP1 and >>> UART >>> 5V 3A Step-Down Power Supply >>> Infrared Remote Control receiver >>> >>> My plan is to use it as Car Radio replacement in my classic cars, so I >>> can have high fidelity audio playback and latest media connectivity (via >>> USB, SD-Card and Bluetooth) without destroying the look of my dashboard >>> with one of these ugly aftermarket car radios. >>> But of course the cape can also be used to extend your BeagleBone to a >>> powerful home hifi system. >>> >>> The user interface is displayed on my Smartphone (I have started to >>> develop an Android App for this based on Qt for Android which already works >>> quite well) and I can benefit from, the phone's Navigation and voice >>> recognition feature. >>> Of course I can use CarStreamer as Hands-Free Telephony system with >>> integrated Echo Cancellation and Noise Reduction feature. >>> The hardware was designed according to Automotive OEMs requirements, so >>> should very reliable and ruggedized. >>> >>> Carstreamer firmware is based on kernel 3.8 with an extension to the >>> existing device tree. >>> The main SW is written using the Qt framework for the application part >>> and the audio framework is using PulseAudio. I have written a Plugin that >>> integrates a powerful Audio Equalizing scheme incl. standard filters such >>> as Bass, Mid, Treble, Graphics EQs but also Speaker Frequency Gain >>> correction, Dynamic Bass boost and Limiters. >>> It also integrates the EC/NR for Telephony and handles things like >>> sample rate conversion and Bluetooth AADP audio. >>> Next step for the Application is to integrate a Media Parser and >>> Playback Engine for SD and USB media (any recommendations for >>> libs/frameworks from your side) ? >>> >>> If anybody is interested in working on this project (the Android app or >>> the Linux firmware) or on sample boards, please let me know. >>> If am planning to release schematics and gerber files as soon as I have >>> verified all parts of the boards. >>> >>> Currently more or less all peripherals of the Cape are working as >>> expected (so yes, I can hear DAB radio stations through the speaker outputs >>> of the Class-D amp :-)) but I had to integrate some tweaks and patches to >>> the 3.8 kernel (e.g. enabling multi-serializer support on the McASP). >>> >>> Please let me know if you have any suggestions / proposals for >>> enhancements or if you wish to know more about it. >>> I am really planning to release the cape hardware and a aluminium >>> extrusion housing as complete product in Q3/2014. >>> >>> >>> Regards, >>> Sebastian >>> >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
