STM32 16bit wav player using Dac

[SS1_Raptor]

Hello friends good time,


I easily play 8bit wav file using DAC in STM32
But when play 16bit wav Anomalous sounds can be heard
tested several sample rate 8k,16k,32kThey all had anomalous sounds
I use the dac 12bit right alignment

MCU Clock 48MHZ
Read Data From MicroSD

in system that play very well 8bit wav .
Someone can help me find the problem?

 

[wwfeldman]

i look at this in a simple way
you have a 16 bit wav in a 12 bit DAC
what happens to the other 4 bits?

if the data is 16 bit, using 12 bits loses something

you use the DAC right aligned
is the data right or left aligned?

what is an anomalous sound?

 

[SS1_Raptor]

this is my code ( In conceptual terms )

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Code dot - [expand]
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buffer[x]>>=4; /* Skip 4bit LSB */
buffer[x] = buffer[x]^0x800; /* Convert Unsigned to Signed */
Dac_Register(12bitLeftAligned) = buffer[x];

---

but not working and have very bad voice


Please help friends who have experience in this area

 

[betwixt]

buffer[x]>>=4; /* Skip 4bit LSB */

I'm not sure exactly what that does but I suspect the '=' shouldn't be there.
I'm also not sure you should convert to signed at all, does the DAC accept signed numbers?

Brian.