Voici un dossier du domaine de la Hifi, c'est une contribution, si vous avez des remarques, suggestions, contactez son auteur, qui je suis sur, vous repondra mieux à votre question... Audio Switch Notes

Approche de la préamplication Hi-FI de qualité... Radio-Plans -Electronique Loisir N°407 par D. JACOVOPOULOS Analog Audio Delay Systems

How to make a Voice Recorder?

I want to make a voice recorder using an MCU(8051 or PIC). The recording time doesn't matter at this time. I just want to learn how to digitalize inputted voice by a microphone and write it to internal RAM. And after this I want to learn how to make it voice again from 1s and 0s format and send it to speaker.

App note and source files: Solid State Voice Recorder Using Flash MSP430


You are never going to be able to use *Internal* RAM. Neither the PIC nor 8051 have more than a few 100 bytes. Generating sounds from a pre recorded
sample stored in ROM is possible but still limited by the size of available memory gives a good guide to encoding sounds on a PC and playing back on a PIC. follows on from the above (costs $1.50 to purchase)

I would suggest looking at generating sound first, from samples recorded on a PC. Apart from anything else, if you start with the recording side you
will end up with data that you have no idea as to whether it is correct or not.

An alternative approach is to look at recognising speech rather than recording it.
Réalisation, simulation P(Spice) d'une chaine HIFI tri-amplifiée
Atmel Sound Recorder gestion de bip par piezo en faible consommation : possibilité de faire un oscillateur a 2 transistors

WAV File Format test samples TEST.WAV :
Why not just build your own? The WAV format is quite simple:

I bet you could whip up a program to generate your desired waveforms in less than an hour.

Remark2: It seems wasteful to put these files website, as they could be rather large, and they are easily generated.Get a copy of the old shareware program Cool Edit 96 or similar program (such as Goldwave). You can download it and generate everything you could want in less than an hour, with no programming.
;) With a good wave file editor you can generate your own. Check out:

Ich hab mal ein wenig rumprobiert, in die 8 KB Programmspeicher eines AVR (8515 iirc) möglichst viel Sound zu bekommen, ein Beispiel gibts hier:

AVR-Source liegt auch in dem Verzeichnis. Die Kompression hab ich in Java geschrieben, der Source ist mom aber totales Chaos.
Prinzip ist Audio-Signal 8 khz/4bit/mono -> PCM auf 3 Bit -> RLE -> Huffman 2.Ordnung. Den Arithmetischen Coder hab ich in Java noch hinbekommen, das Gegenstück in AVR-Assembler hab ich sein lassen.

Sind knapp 5 Sekunden, paßt komprimiert mit Dekompressor und Software zum Abspielen gerade eben in die 8 KB rein. Das hab ich vor der Vorlesung Digitale Audiosignalverarbeitung gebastelt, heute würd ich das wohl anders machen. Application Note von Atmel "AVR335: Digital Sound Recorder with AVR and DataFlash"
- Digital Voice Recorder
- 8-bit Sound Recording
- 8 kHz Sampling Rate
- Sound Frequency up to 4000 Hz
- Maximum Recording Time 4 1/4 Minutes
- Very Small Board Size
- Only 550 Bytes of Code Wav audio to Eprom GSM 06.10 lossy speech compression - telephone quality speech - 13 kbit/s - free sourcecode The Talking Toaster Speech recognition, using the HM2007 speech chip. Speech playback, using ISD's ISD 1000A chip. Microcontroller system control, via Motorola's MC68HC11 microC. Appendix E of the Final Report is the microcontroller code, TOS v1.6e2. It is also available as a .asm file separately. An old toaster. Servo motor. Plain and simple ingenious engineering. Simulation Electronique SPICE, PSPICE dans l'AUDIO, HIFI Big Ben Gong Schéma pour la réalisation d'un theremin Connecttique audio (prises DIN) etc... Chenillard 8 voies à Eprom Connecteurs magnétophones DIN , peritel, etc.. EUROPA Upgrade module for Roland Jupiter Analog Synthetiser (The upgrade is comprised of a 12MHZ Temic T89C51RD2 CPU, one resistor, and one 40 pin socket. That's it. No boards - just the parts mentioned. Think of it as a brand new embedded OS for this synthesizer.) La norme Midi

DMX512 Le DMX512

Va voir dans la revue Elektor de ce mois (juin 2002), n° 288
et tu trouveras ton bonheur (gradateur 4 voies )
un site existe :
tu peux télécharger la platine

générateur de bruit de diesel lourd pour modèle réduit navigant (Elektor février 1989 P.40/42) à base de NE555, NE556 et TDA2003

Coucou (Elektor Avril 1985 P.49/51)

Filtrage dynamique pour ampli de sono Audio & Electronique

Commutateur audio SSM 2402

5 Modules utiles pour la sono

4 cartes utiles pour la sono

Micro module de réverbération électronique

7 modules utiles pour la sono et le mini-studio site de référence pour les tubes

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    M-à-j: 21 février, 2016