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Audio recording/playback using ATmega128 | AVR Freaks
https://www.avrfreaks.net/forum/audio-recordingplayback-using-atmega128
I want to record audio at 8000 samples per second with 8 bit resolution. I'm using 14.745Mhz crystal with Aref tied to external reference source of 5.0 Volts. To achieve a sampling frequency of 8000 Hz a sample has to be taken every 14.745Mhz/8000 = ~1843 cycles.To get one A/D conversion result each 1843 clock
avr - Is is feasible to build an audio recorder with SD ...
https://electronics.stackexchange.com/questions/15006/is-is-feasible-to-build-an-audio-recorder-with-sd-card-storage-using-atmega-16-o
Is is feasible to build an audio recorder with SD card storage using ATmega 16 or 32 running at say 16 MHz? If yes, what would it need in components? I don't expect you to make a device for me, but a high level overview of needed parts would be welcome.
AVR42777: Digital Sound Recorder using DAC with ATtiny817
https://ww1.microchip.com/downloads/en/appnotes/atmel-42777-digital-sound-recorder-using-dac-with-attiny817_applicationnote_avr42777.pdf
Atmel-42777A-Digital-Sound-Recorder-using-DAC-with-ATtiny817_AVR42777_Application Note-10/2016 8. timer overflow ISR updates the DAC data register in order to change the output at the same rate as the samples were taken. This results in a reconstructed signal, which is as accurate as possible. Figure 2-3.
How Tape Recorders Work - ATMega32 AVR
https://atmega32-avr.com/how-tape-recorders-work/
There are two parts to any audio magnetic recording system: the recorder itself (which also acts as the playback device) and the tape it uses as the storage medium. The tape itself is actually very simple. It consists of a thin plastic base material, and bonded to this base is a coating of ferric oxide powder. The oxide is normally mixed with a binder to attach it to the …
arduino - How to read an audio signal using ATMega328 ...
https://electronics.stackexchange.com/questions/5315/how-to-read-an-audio-signal-using-atmega328
The combination of the C with the R sets the lowest frequency that can pass through to the ADC. DC (the ultimate low frequency) is blocked, while AC passes through. In this case, the cutoff frequency would be 1 Hz, which is plenty low for audio. The DC bias is provided by something in the middle of the ADC range, with low noise.
SD/SDHC card sound recorder
https://www.moty22.co.uk/sd.php
SD/SDHC CARD SOUND RECORDER FOR ARDUINO Updated on 12/2/2021 A sound recorder project for Arduino Uno or Nano with ATMEGA328P device. The firmware works for SD or SDHC cards only. The quality of the audio is reasonable. The ADC sample the input at 10K s/sec, 8 bits mono in a format similar to .wav files.
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