Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [digital-audio]

65 questions
17
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5 answers

How different can the digital signal from a low-cost CD player be from that of an expensive Hi-Fi CD player?

According to the high-end Hi-Fi connoisseurs' bibles, for a perfect reproduction of the sound, in addition to "special cables", etc., you must have a specialized stage of CD which reads the optical disc and outputs the digital signal. Assuming that…
bandi
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9
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2 answers

Regular DACs versus audio DACs

Context In trying to make modular linear power supply with digital control, I figured I'd need a DAC to output the correct voltages into the feedback circuitry (two - one for voltage and one for max current). I wanted these to be 16-bit so I could…
TrisT
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9
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6 answers

ESP32 ADC not good enough for audio/music?

I've heard that the ESP32's ADC isn't "good" enough for audio purposes. It's a 12 bit SAR ADC with a sampling rate of 200 ksps which is much higher than most consumer products use (44.1 kHz). Does 200 ksps not correlate to a 200 kHz sampling rate. I…
Jacob Lara
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5
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1 answer

The relationship between bit depth and SNR in ADC

An 8-bit audio signal has a theoretical maximum SNR of 48.16 dB (20log(2^8)). My question then would be, does this work in reverse, i.e. would an analogue audio (or video) signal with an SNR of <=48 dB only be worth sampling at 8 bits? Or is this…
pvmnerd999
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4
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0 answers

CD player playing digital noise on a track full of silence

I'm trying to repair a Nakamichi CD Player 3 that I got recently. Service manual from ElektroTanya Relevant section of the schematic: Initially, it would not open and just show an error. Replacing belts and bending the home position spring of the…
akasaka
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4
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1 answer

If I invert an I2S data line, it inverts the audio, right?

It seemed obvious to me, but then I read all these audio forums where they're talking about overflow, tones, etc. and I just want to make sure I'm not missing something. If you take an I2S signal: and run the serial data (SD) signal through a logic…
endolith
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2 answers

Recording aliased tones on purpose

For research purposes, I am trying to transmit a tone and record it using sub-Nyquist sampling. Via the PC microphone, for instance, I would expect to see the aliasing effect somewhere in the spectrum plot, but no matter what I try it is absent. I…
Dannynis
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2 answers

How to interface to a PDM audio source?

I hear about this technology, I read about it, I even see a bunch of MEMS microphones with PDM output. I can perfectly understand how it works (I have worked with DSP). However, I can't seem to make heads or tails regarding how do I deal with it…
Cal-linux
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2
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4 answers

Audio frequency response over Bluetooth

Introduction : Using some binaural beat meditation, the vendor claims that their sound frequency goes down to 5 Hz to get better meditation quality. Even though the human ear can't hear 5Hz, the brain responds to it. The vendor advised using wire…
bouqbouq
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Interfacing PCM3060 Audio Codec With STM32

I am using a STM32F4 MCU, currently prototyping on a Nucleo-F446RE. I have a PCM3060 audio CODEC to do the analog to digital conversion. I am attempting to use the I2S protocol in order to interface the stm32 chip with the CODEC to process real time…
APC77
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1 answer

How can I convert an audio PDM bitstream into analog form?

I have collected PDM bitstreams from MEMS microphones and I'm looking to convert them into analogue form. Does anyone know some practical implementation details on how to do this (beyond a quote from Wikipedia that states this only requires a low…
dg1271
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2
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1 answer

CSR8645 3.2 bluetooth module audio output merge negative pins

I want to use this module with my car aux in which is has 3.5mm 3 pole jack. This module has separate negative pins as LN and RN. I need to merge and connect these pins to aux in common negative pin.
Ercan Koc
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3 answers

S/PDIF: TTL to Coax Converter

I'm working on converting TTL S/PDIF to Coaxial level (0.5Vpp). I have implemented the following circuit using a Toshiba TC7W04, which is a 74HC04-type inverter: But it does not appear to work in practice (I am working on getting access to a scope…
t3ddftw
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2 answers

How to analysis this Operational-Amplifier circuit?

This is a reference buffer circuit that make a single-end audio input to be the differential inputs for ADC. Circuit-1: It does not like typical Op-Amp circuit of the same purpose like below. Circuit-2: I understand how the circuit-2 works, but I…
Bob Yang
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vote
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Unexpected DAC output waveform when connected to a line input

I'm using a TAS5754MDCAR DAC in a Bluetooth receiver. DAC_OUTA and DAC_OUTB are connected to the internal amplifier inputs per the Datasheet (as below): When I play an audio file and view DAC_OUT on my scope, I see a completely normal audio…
DavidB
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