All Questions
Tagged with digital-audio audio
41 questions
0
votes
1
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112
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Music player via ESP32
I have a music player via an ESP32 and an SD card module
Structure:
SD card module (with the .wav files) -> ESP32
ESP32 pin 26 to Audio amplifier module LM386 IN (with 10µF capacitor between IN and ...
1
vote
2
answers
74
views
Inline volume control for analog audio signals with push buttons [closed]
I want to build something to control the amplitude of analog audio signals between the source (line level analog audio output already extracted and decoded from an HDMI source) and the AMPs. In ...
- 21
0
votes
3
answers
151
views
Why is there a greater lag in Bluetooth headphones compared to wired?
The Usual Answers and Responses:
Encoding, Compression, and Buffering
The typical answer to this on the internet is because Bluetooth headphones require the conversion of one form of data information ...
- 111
0
votes
1
answer
153
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Is it possible to add headphones to a Geiger counter circuit?
The main problem is as follows. From what it seems, most Geiger counter circuits opt for a piezo clicker. I'd like to just plug in a 3.5mm audio jack and be able to hear when pulses come in. The ...
- 21
0
votes
3
answers
146
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Calculating audio sample output rate for synthesizer
I'm building a synthesizer on an FPGA and I'm having trouble calculating sampling rates. Currently, I'm running a system clock at 98.3 MHz and I want to produce 16-bit audio at the output.
I've got a ...
- 215
1
vote
0
answers
190
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What is SAI frame synchro?
The SAI interface, as used by ST and others, includes some options which I have not been able to find any explanation of. Justme's answer provides a great explanation of frame, slot, and data size; I'...
- 1,347
0
votes
2
answers
277
views
Can I capture audio over SPI on from the onboard MEMS microphone?
I have a STM32H735G-DK Discovery board and would like to record audio from the onboard digital MEMS microphone, a MP34DT01TR-M which provides PDM audio.
It would seem to me the simplest way to do ...
- 1,347
0
votes
2
answers
69
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What's the relationship among speaker amp IC's supply voltage and gain?
I am new to designing audio circuit. Looking at TI TAS6424 class-D amplifier (https://www.ti.com/lit/gpn/tas6424-q1), on section 9.3.3 p.23, it mentioned volume control from -100 to +24 dB.
Given the ...
- 689
0
votes
1
answer
180
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How long is the S/PDIF preamble?
I have a simple S/PDIF protocol question that I can't find the answer to anywhere. I'm trying to understand the protocol, and everywhere I look says the same thing: The length of a preamble pattern is ...
- 628
1
vote
0
answers
37
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RN52 Custom Circuit Board Generating a Loud Buzz While Playing Audio
I'm in the process of creating a custom circuit board using an RN52 with a PIC16 controller to hack into my car's stereo and pretend to be a CD changer. The device does work, but while the audio plays ...
0
votes
1
answer
60
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I need clarification for an audio power amplifier circuit component
Below is the block diagram of my first design using an audio power amplifier.
The input to the audio power amplifier comes from an SC200 module by Quectel.
The output of the PA is connected to a ...
- 3,061
0
votes
2
answers
3k
views
Record audio with digital I2S MEMS microphone and store audio as wav file on PC
I would like to use a digital I2S microphone to record audio and store it as wav on a PC, preferably over serial connection. I have tried this with the boards ESP32 dev kit v1, MKR Wifi 1010 and ...
- 1
1
vote
2
answers
486
views
How to interpret this PCM audio data?
I am attempting to write a program to get an ATmega328P to play audio. I first tried to use this library but I could not get it to work so I am now attempting to program my own. The problem is that I ...
- 269
17
votes
5
answers
6k
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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 ...
- 447
3
votes
5
answers
2k
views
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 ...
- 593
-1
votes
3
answers
839
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A way to make simple digital potentiometer [closed]
I am making a project which has an audio application with a TDA amplifier.
To change the volume I have a potentiometer on the input of the amplifier so when you change its value the sound is higher or ...
4
votes
1
answer
434
views
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:
...
- 29k
0
votes
1
answer
978
views
My speaker connected to my TV is making weird noises only when playing videos [closed]
Apologies if this is the incorrect forum, if anyone knows of a better forum to ask on I would appreciate the redirection.
I have a very specific issue regarding audio playback from my TV. I have a ...
1
vote
1
answer
404
views
How to remove low-level audio noise from an ATMEGA328p + LM386 circuit
I'm building an audio project with an ATMEGA328p using an LM386 as the amplifier and the Mozzi audio library.
Power source is 4 AA batteries.
I'm using an MCP1700 voltage regulator to drop the ...
1
vote
0
answers
72
views
Best way to output n digital signals using n-1 DAC channels
I have 3 digital signals that need to be mixed and output into the analog domain. My DAC has 2 channels (Left and Right).
The way I see it, I can:
mix the signals 1, 2, and 3 digitally and output ...
- 11
-1
votes
1
answer
961
views
Get AES/EBU signal from S/Pdif
Recently on the road with an Audio Engineer, I've heared that (Coaxial) S/PDIF and AES/EBU are quite similar and could be passively adapted, and said that these two signals are the same on the logic ...
- 356
0
votes
1
answer
203
views
Understanding input/output in audio amplifier
As I was trying to refurbish my Sony STR-434BS, I choose to install a brand new audio amplifier IC, specifically the TDA8954 as main chip for it's power deliver (around 100 [W] in stereo mode) and ...
0
votes
0
answers
36
views
Dependence of the PWM amplitude of the amplifier on the battery voltage
I'm going to use speaker connected to internal Class D amplifier in WM8998 in my PCB.
Power source of my PCB is Li-Pol battery with 3.2-4.1V range or external 4V adapter.
Audio codec speaker power ...
0
votes
1
answer
112
views
What would be the best, cheapest, smallest way to power a Bluetooth bone conduction headset project?
Please, be forewarned, I'm an idiot when it comes to electronic builds. The last thing I soldered was a pick-up in a guitar kit I built, and the thing still isn't grounded right.
I'm trying to build a ...
- 11
0
votes
0
answers
383
views
Transmitting I2S over 6ft
I've been looking at audio ADCs with most rated at 192Ksps with 24 bit audio. Typically the output is in I2S, but I understand that the signal is not intended to go far. I understand that HDMI can ...
1
vote
3
answers
592
views
Noisy AES audio signal in studio installation
This is a question about digital audio cables. I know this isn't an audio engineering forum but the question's specific to the physical connections and there's limited info online which I can find ...
- 11
11
votes
6
answers
16k
views
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)....
- 143
5
votes
1
answer
2k
views
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 <=...
- 63
2
votes
1
answer
3k
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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 ...
- 45
1
vote
1
answer
271
views
Is it relatively simple to design an ADC to ADAT interface with only a Toslink port?
For this project (I'm an experienced audio engineer but a relative beginner in electrical engineering) I really want to integrate a simple ADC to ADAT circuit in a patchbay I'm building so that I have ...
- 11
0
votes
2
answers
1k
views
How to play music on PAM8610 with ESP32?
I'm trying to use Xtronical's DAC audio library on an ESP32 to run 10W speakers. The board that Xtronical used is a PAM8403 which has a signal voltage range of -0.3V to +0.3V but as it can only run 3W ...
1
vote
0
answers
351
views
How to interface a microphone to an I2S input to use HFP
For my group's SDP/Capstone we are doing a bluetooth headset of sorts. We are using a CYW20706 SoC from Cypress. Specifically, we are using a this CYBT-343026-01 Cypress module whch includes that ...
- 11
0
votes
1
answer
177
views
What type of audio output does this symbol represent?
I have this picture. I want left, left ground, right and right ground output. Pin. But I can't understand it. Can somebody please help me. Thanks.
2
votes
1
answer
590
views
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.
- 21
2
votes
3
answers
3k
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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 ...
- 515
1
vote
2
answers
2k
views
I2S MCLK Generation
I'm working with a Sierra Wireless BC127 (Bluetooth Module) I2S master which is generating Left-Justified, 16 bps @ 44.1khz sample rate. The Bit clock is set to 2.822 Mhz.
I want to use a Cirrus ...
- 515
0
votes
1
answer
244
views
SQNR and Dynamic Range
An audio tone \$Acos(\omega t + \theta)\$ undergoes uniform quantization by a quantizer that has the average quantization noise power \$q^2/6\$ joules, where \$q\$ is the quantization step size. If ...
- 11
0
votes
1
answer
110
views
Translating/reverse engineering firmware commands
I'm trying to build my own Hi-Fi system. So, I recently ordered this Japanese DSP that's able to process Dolby audio. I was all excited until the part had arrived and I found something in the ...
- 159
0
votes
1
answer
185
views
Impedance matching between CSR8675 and a MM20 microphone
I'm building my own (rugged) headphone. I am planning to use a MM20-33639-000 microphone with CSR8675 DSP. My question here relates to impedance matching.
Based on what I have read, most modern ...
0
votes
1
answer
320
views
Understanding Audio Amplification with OpAmp
I have what I believe to be a fairly simple schematic, as shown below, to take either a PWM signal from an AVR board to play a song/alarm, or radio signal.
I'm connecting both of these with a ...
- 13
3
votes
2
answers
4k
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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 ...
- 2,175