Decompress, Decode and Display ECG Signal (Base64)

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C#

Base64

decompression

Hi everyone,

I'm trying to represent a ECG signal contained in a Xml File. I'm wondering what's the best way to do that?
Seems that the signal of all channels are encoding in base64, so i've got to decode it into readable values, to represent the graph.

Here's a piece of the Xml Signal:

CHANNEL
OFFSET="0"
BITS="16"
FORMAT="SIGNED"
UNITS_PER_MV="400"
DURATION="10000"
SAMPLE_FREQ="1000"
NAME="aVR"
ENCODING="BASE64"
DATA="6v/q/+n/6f/p/+n/6v/s/+z/6//r/+v/6//r/+z/7v/u/+7/7v/u/+7/7v/u
/+//7//w//H/8f/x//D/8P/w//D/7//v//D/8P/v/+//8P/x//H/8f/x//H/
8P/v/+7/7v/u/+7/7//v/+//7P/p/+n/6f/q/+z/7f/v/+//7//u/+7/7f/r
/+v/6//r/+r/6v/r/+r/6f/p/+r/6v/q/+r/6//p/+f/5v/k/+T/5f/l/+X/
5f/l/+T/5P/k/+T/5f/k/+L/4f/i/+H/4v/h/+L/4f/i/+H/4v/k/+T/5P/k
/+T/4//k/+b/5f/i/+H/4P/f/97/3//g/+D/4f/h/+T/4v/j/+X/5P/k/+T/
5P/j/+L/4//k/+T/5P/l/+X/5f/l/+b/6f/l/+f/5v/l/+b/5v/m/+b/5//n
/+f/5v/o/+X/5//l/+T/4v/i/+L/5f/p/+r/7P/s/+7/7f/u/+3/6//p/+b/
5//n/+j/6f/n/+f/6f/p/+v/6v/o/+b/6f/n/+n/6f/p/+v/6f/q/+v/7P/r
/+v/7v/v/+7/7//u/+7/7//v/+7/7v/t/+v/6//q/+z/7P/s/+7/7v/v/+v/
6v/s/+z/7v/v/+7/7v/t/+z/7f/v//H/7v/u/+7/7f/v/+7/7v/v/+z/7f/r
/+3/6//s/+v/7//u/+3/7v/r/+z/6//r/+z/7v/v/+//7f/u/+7/7//t/+7/
7v/u/+7/7v/t/+7/7//x//H/8//x//D/7v/w/+7/7v/s/+7/7v/u/+3/7v/t
/+z/7P/s/+//7v/u/+7/7v/w//D/7//t/+7/7//v//H/8P/v/+//7//v/+3/
7//x//H/8P/x//H/8//y//H/8f/w/+7/7v/v//D/8P/w//H/8P/w//H/8//z
//D/7//x//D/8f/w//H/8f/v//H/8v/0//D/8P/y//P/8f/z//H/8P/x//D/
7//v/+//7//z//T/8f/x//P/8f/x//H/8//x//H/8f/u/+z/7P/w/+//9P/z
//X/9f/z//H/7//w/+//8f/x//P/8//x//H/9P/0//P/9f/0//T/9f/2//T/
8//y//H/8f/x//L/8P/w/+//8f/x//H/8f/y//P/8//z//H/8P/t/+v/6//p
/+n/6f/n/+r/5//n/+j/5//l/+X/5v/l/+T/5f/l/+T/4f/g/+D/3//g/+H/
3//f/97/3f/d/9//3v/d/9z/1//T/9L/0P/R/9H/0f/O/87/0P/R/9D/0P/P
/87/0v/S/9D/0P/S/9H/1P/V/9b/1//V/9P/1P/T/9b/1//b/9//3f/f/9//
4P/f/+D/4P/f/9//4f/i/+L/5f/p/+j/6f/r/+z/7v/v//D/8P/x//P/9P/1
//X/9f/z//b/+P/6//j/+f/3//j/+f/5//j/9v/z//P/9//2//b/9v/2//X/
9v/4//n/9v/4//j/9v/z//P/9P/z//b/+P/5//z////+//3/+f/2//b/9P/v
/+v/5P/d/9f/zv/H/7z/tf+p/6L/mf+S/4z/gP92/2v/ZP9V/0b/N/8n/xb/
Ev8X/yL/Mf9G/17/dP+I/6H/w//i//f/AQAJAAwAEwAVABoAHwAlACkALwA2
ADYANAA2ADgANwA2ADQAMwAyAC8AKwApACUAIAAeABsAHAAYABUAEQARAAwA
CAABAP7/+f/1//T/9v/2//X/9f/2//X/9v/1//f/+f/5//n/+f/5//r/+f/4
...

Please help me, congrats