ANALOG SIGNAL TO 8 BITS SIGNAL

Question

ANALOG SIGNAL TO 8 BITS SIGNAL

RafaelCastro (Electrical)

(OP)

11 Feb 15 22:42

HI everyone !

I'm doing a program to transform a normal sine wave into a 8 bits signal

I'm just a beginner and i want your help to know if i'm doing it right.

I give you here the algoritm that i think it work

range = 5 % the max of my sin wave
n8 = 8; % number of bits
q8 = range/(2^n8); % quantization interval
quant8=composto/q8;

a8=fix(quant8);

sinalcod8=a8*q8; my final signal

Thanks

RafaelCastro (Electrical) · Answer 1 · 2015-02-11 22:45:53

RE: ANALOG SIGNAL TO 8 BITS SIGNAL

RafaelCastro (Electrical)

(OP)

11 Feb 15 22:45

composto is my sine wave

SomptingGuy (Automotive) · Answer 2 · 2015-02-11 23:01:12

One comment...

You may find that your target 8-bit format uses unsigned integers (0-255), whereas your raw data is likely negative and positive. For 16-bit, signed integers are more common. So you probably need to decide whether to apply an offset based on the number of bits.

- Steve

RafaelCastro (Electrical) · Answer 3 · 2015-02-14 19:16:08

Hi Steve,

Now i use this function, dec2bin to transform this to an bin code. but i dont know how to represent this on a graph like plot.

Can you help me ?

sinal_digital8 = dec2bin(abs(a8),n8);

thanks ;)

GregLocock (Automotive) · Answer 4 · 2015-02-14 21:30:25

I suggest you use matlab's extensive help browser.

Cheers

Greg Locock

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RafaelCastro (Electrical) · Answer 5 · 2015-02-15 19:24:00

... I can't find a solution to my problem... :/ when i want to transform binary to gray code i find an error Undefined function 'grey2bin' for input arguments of type 'char'. and i can't plot my matrix of binary code... i want to represent like a square pulse

thanks

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ANALOG SIGNAL TO 8 BITS SIGNAL