Questions tagged [mp3]

Anything related to MP3 digital audio format, i.e. a format for digital audio files, and related technologies.

Anything related to MP3 digital audio format, i.e. a format for digital audio files, and related technologies.

MP3 format is more exactly referred to as MPEG-1 or MPEG-2 Audio Layer III format. It is a lossy compression format, i.e. a format whose encoding algorithm trades the loss of some of the original audio information for higher compression ratios.

See also Wikipedia on MP3 format.

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Playing .mp3/.wav file using AVR ? How

I want to play a small .mp3 file using AVR ? How I've been googling with no good result , Those are the result of m googling…
xsari3x
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MP3 player shield makes noise

I'm using the mp3 player shield from sparkfun and an Arduino UNO. Everything is OK, I formatted my Samsung micro SD cards with FAT, I converted mp3 files with ffmpeg, I load the examples file and modified them a bit, I can play mp3! Great. This is…
nkint
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Speakers: danger of blowing things up

I have an MP3 sound chip module from Talking Products. 4.5 volt battery driven 40mA with an 8 Ohm. 0.5 Watt speaker. I briefly plugged in two 4 Ohm 3 Watt speakers and they worked (and sounded much better). As a complete electrical novice will…
Porl
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Help finding a design house to build our MP3 player

We used an Asian design house to design, program and build our custom MP3 player. The chip we used (Sigmatel) is no longer avaialble and the DH does not do this type of work anymore. We are looking for a reputable company with relevant experience to…
MP3 Maker
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Triggering 120 MP3 players with an Arduino Nano and a 4066 chip

I have a circuit that sends a 300 ms signal (a short button press) from pin D13 on an Arduino Nano to a 4066 chip, which then sends it to 4 boards (A, B, C, and D). Each board connects to 30 MP3 players (GPD2846 modules) with 5 V power, GND and an…
wonkymouse
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How to detect if a TRS cable is connected to a MP3 player output?

Imagine I have a MP3 player and one male-to-male TRS cable that could be connected or not to the output of that MP3 player on END1. By having a multimeter on the other end END2 of the cable, how could I detect if the cable is connected there or…
Elektrik
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Why are some mp3 players so expensive?

I have noticed that mp3 players around the 32Gb area seem to be fairly expensive; I haven't seen any for less than £150. Conversely, players with smaller storage can be found at a much lower price, for example 4Gb players are usually about £20. 32Gb…
Bill Cheatham
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DFPlayer + amplifier give weird noise

I connected a DFPlayer with a PAM8403 on pin DAC_R like this: I also added capacitor on the supply line. Here the sound i have from the speaker: You can lisen here: https://www.dropbox.com/s/odw1ya0uxkn16ut/audio.mp3?dl=0 What can be the…
David Blais
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DFPlayer Module Sleep mode working for anyone?

I'm trying to put a DFPlayer module into sleep mode. The command seems to be: 7E FF 06 0A 00 00 00 FE F1 EF. The normal power consumption my supply is showing (when the module is idle) is about 15mA, after sending the sleep command I read exactly…
user34920
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DIY Multi-Input Audio

Edited, see bottom of this post. What would be the best method for preventing damage to multiple audio input devices that are connected to a home made audio patch panel? Im wanting to make a device or cable where I can connect multiple 1/8" 3.5mm…
user608804
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Converting headphone signals into MP3 using Arduino

For my project, I am looking for a way to take headphone audio signals (from TVs and other appliances), convert them into MP3 and send them over WiFi to a remote device (PC or other) using Arduino UNO and a Wifi Shield. Any ideas as to a circuit…
user68030
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Simple Audio Sampler And Looper

I am seeking to build a small drum pad that can trigger short mp3 files. Here there are a lot of specifications and I don't expect to have everything explained, but any tips on how to go about making this, what IC's to use especially, or any general…
Kevin Macklin
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24-bit DAC + D-class amplifier in singlechip - good solution for pocket MP3 player?

I am doing personal project - portable MP3 player. Goals are sound quality + power efficiency. Price is not limited to a reasonable amount (100-200$ in parts is ok) Will single-chip DAC+D-class amplifiers give me best possible power efficiency while…
BarsMonster
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On the fly digitizing audio from analog audio jack

If I am correct, I believe that all normal audio jacks (like the ones you have to your PC, traveling to your speakers) are analog. Is there a way (perhaps with a high speed ADC) to convert it to digital on the fly? I am considering a project with…
user1584421
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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 don't know how to interpret the audio data that I…
luek baja
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