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Voice recorder using ADC and microcontroller

 
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the_wind



Joined: 08 Jan 2006
Posts: 27
Post28 Jun 2006 12:08   Voice recorder using ADC and microcontroller
can anybody give me some overview about this topic including the project design and infos....

plzzzzz......

i really need your help for this undergraduate design of mine....

thank you....
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Sudhir.K.A



Joined: 26 Feb 2006
Posts: 46
Helped: 5
Location: Bangalore
Post28 Jun 2006 13:58   Re: Voice recorder using ADC and microcontroller
tags: voice recorder using adc and microcontroller microcontroller voice recording microcontroller audio recording microcontroller voice recorder voice recorder microchip voice level microcontroller voice level and microcontroller voice recorder microcontroller voice recorder with microcontroller voice recorder with pic microcontroller voice recorder with adc using microcontroller microcontroller for audio recording play voice with microcontroller
Hi the_wind,

I am posting the block level schematics of what you might be looking forward to build a voice recorder.There will be some specs according to which u can choose appropriate component.

I have added DAC and speaker as without play back, recording would not make much sense.

Input amplifier to the ADC can be built using opamp.By observing the output voltage of microphone gain can be selected.

ADC - sampling rate has to be greater than 40 k samples per sec. you can go for 8 - 10 bit ADC's, or else search for microcontroller with the required ADC as a pheripheral on it. This will make things easier. Search in microchip PIc 18F series as PIC gives free samples.


since uC actually has to just read and write from some memory location any microcontroller would do


Memory: If you have time go for compact flash interface. CF+ is a standard.All timing diagrams are available on net. or any other flash or EEPROM option can be considered. keep in mind that read/write cycles for EEPROMs are limited.
or SRAM with seperate battery back up can also be considered as reading and writing then will become simpler.


For power amplifier deisgn such that it drives 8 ohms speaker load. ready power amplifier modules are also available or else push pull amplifier would do.
LM384 is an audio power amplifier.

obiviously DAC output has to be filtered before giving to power amplifier keep that in mind .


ALL THE BEST,
Sudhir

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jjohn



Joined: 17 Jun 2006
Posts: 275
Helped: 26
Post28 Jun 2006 14:45   Voice recorder using ADC and microcontroller
tags: silabs microcontroller voice recording microcontroller voice recorder voice recorder microcontroller voice recorder with microcontroller high quality sound recorder microcontroller
The Voice Recorder Reference Design illustrates how to use a C8051F411 for voice application. It is a practical demonstration of C8051F41x high performance analog and CPU throughput capability.

The voice recorder uses DPCM (Differential Pulse Code Modulated) compression to convert 12-bit samples of the ADC and IDAC to 6 bits at an effective sampling rate of 8 kHz. This compression allows for an extended recording time without audibly losing sound quality. Additional ADC features such as Burst Mode and Repeat Count are utilized to improve the quality of the sound samples during the recording process. The C8051F411 Suspend operating mode also allows the voice recorder to reduce power consumption when idle.


http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers/en/voice_recorder.htm
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svicent



Joined: 11 Jul 2001
Posts: 407
Helped: 22
Post28 Jun 2006 15:44   Re: Voice recorder using ADC and microcontroller
tags: avr335 digital sound recorder avr dataflash
AVR335: Digital Sound Recorder with AVR and DataFlash (20 pages, revision C, updated 04/05)

h**p://www.atmel.com/dyn/resources/prod_documents/doc1456.pdf

This Application Note describes how to record, store and play back sound using any AVR MCU with A/D converter, the AT45DB161 DataFlash memory and a few extra components.

Regards, svicent
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the_wind



Joined: 08 Jan 2006
Posts: 27
Post30 Jun 2006 6:30   Re: Voice recorder using ADC and microcontroller
guyz thankz for the infos and advises...can u give me some sample designs of this particular project of mine...i really need it...
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visioneer



Joined: 06 Jan 2002
Posts: 112
Helped: 1
Post03 Jul 2006 1:25   Re: Voice recorder using ADC and microcontroller
OKI semiconductor has an excellent silicon for voice record and replay.


http://www2.okisemi.com/site/productscatalog/speechics/availabledocuments/Intro-4300.html
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mos



Joined: 15 Sep 2006
Posts: 14
Post19 Sep 2006 21:47   Voice recorder using ADC and microcontroller
see too.
http://danhalloween.250free.com/sound.htm
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