I recently asked for advice on a player for lossless audio using FLAC files because I wanted to build a standalone player to replace the CD player I have.
I did not want any streaming capability and I received lots of info.
I have a tri-amp with a front end signal filter which works very well but I wanted to build a digital music player with digital filters and attenuators followed by 3 stereo DAC units which I could feed into the analogue HF, MF and LF amplifiers.
I eventually decided to use WAV uncompressed audio files as memory is now cheaply available and I have built the first part using a teensy4.1 with an audio shield and micro sd card. This works great using a single stereo DAC unit with the output fed into my tri-amp (see photo for test). So the output is CD quality.
The next stage is to build up the software code with a screen so that I can see and select which files to play.
But I am not sure about the 3 stage digital filter; if I use another teensy with the ARM processor, as this is sequential will I get a signal delay between the HF, MF and LF outputs.
I thought about using 3 ARM processors, one for each frequency band or perhaps an FPGA; advice appreciated.
I intend to write the software for the digital filters, attenuators and DAC output units.
My tri-amp attenuator uses a pic 18F4525 processor with three digipots and display screen; I wrote the software for this in assembly about 5 years ago and it has been very reliable so I will not be buying any off the shelf units.
I did not want any streaming capability and I received lots of info.
I have a tri-amp with a front end signal filter which works very well but I wanted to build a digital music player with digital filters and attenuators followed by 3 stereo DAC units which I could feed into the analogue HF, MF and LF amplifiers.
I eventually decided to use WAV uncompressed audio files as memory is now cheaply available and I have built the first part using a teensy4.1 with an audio shield and micro sd card. This works great using a single stereo DAC unit with the output fed into my tri-amp (see photo for test). So the output is CD quality.
The next stage is to build up the software code with a screen so that I can see and select which files to play.
But I am not sure about the 3 stage digital filter; if I use another teensy with the ARM processor, as this is sequential will I get a signal delay between the HF, MF and LF outputs.
I thought about using 3 ARM processors, one for each frequency band or perhaps an FPGA; advice appreciated.
I intend to write the software for the digital filters, attenuators and DAC output units.
My tri-amp attenuator uses a pic 18F4525 processor with three digipots and display screen; I wrote the software for this in assembly about 5 years ago and it has been very reliable so I will not be buying any off the shelf units.