HI,
My project is guidance system for visually impaired, through voice sound that would be heared to them with earphones...
I have been working with Atmega168 for synthesizing audio from arduino with the great help from the code below Arduino Playground - PCMAudio.
I also got good audio output for this code.
The problem here is i want about 36 samples of sound (mostly 1sec audio for speaking 10 numerals and 26 english alphabets as separate samples, so total approx 36-40 sec audio ) to be stored in arduino but will there be memory room to accomodate it...
And what would be the best solution to solve it...i have atmega328 now will that have enough memory...
i would much prefer to go with any procedures using atmega168 or 328 with eeprom interfacin....pl suggest how to store these audio samples in simple way...
PLEASE HELP....
THANK U ...
Look into serial EEPROM for storing your sound samples. I2C or SPI interface.
Need to write a sketch to receive data from your PC to load into the EEPROM, then your fielded application would read them back out as needed.
40 sec of 8 bit 8kHz sound data occupies 312.5kiB. And the sound quality is not that good. Going 20kHz makes already a bit more than 780kiB. This just for the amount of raw sound data.
Other questions: Which DAC can be used with Arduino? Which interface to the DAC and will it handle the data stream? 16 bit maybe with lower frequency? Any audio codec in the DAC (less data)? Any shield already available for this kind of task?
These are just the first questions which came to my mind on this problem. I'm new to Arduino, so maybe somebody else has some answers.
Marek080:
40 sec of 8 bit 8kHz sound data occupies 312.5kiB. And the sound quality is not that good.
This will be approximately equal to telephone (landline, not cell) or AM radio quality; not the greatest, certainly, but more than adequate for the task, most likely.