I was wondering we can easily interface LCD, led an pot etc but I couldn't find way how to record my different voice strings and playback specific string as per commands that given to pic


closed as unclear what you're asking by brhans, Matt Young, PeterJ, uint128_t, Nick Alexeev Apr 2 '16 at 5:13

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    \$\begingroup\$ You need to add a lot more detail/context/question to this "question". You haven't asked a question, haven't specified which hardware you're using, haven't specified a goal, and so on. \$\endgroup\$ – uint128_t Apr 2 '16 at 2:59
  • \$\begingroup\$ Sir or madam I can able to use any pic microcontroller ! But I don't even know what parameters I have to consider for this function ! And for recording I want to use a simple microphones and I don't know in what form I have to convert that for working with pic \$\endgroup\$ – user103110 Apr 2 '16 at 3:03

At its simplest, voice recording is simply taking regular analog-to-digital (A/D) samples and saving them in memory (temporary or permanent as the application requires.)

And then retrieving the same set of stored sample values and outputting them through a digital-to-analog (D/A) converter. Or even using PWM (pulse-width-modulation) as as common method of producing analog voltage from a digital output pin.

Some of the challenges are: having enough memory to store the relatively large block of data from a few seconds of audio. And then the problem of maintaining a steady sample frequency/pace for recording and for playing back. In many microcontroller chips, you don't necessarily have complete control over the exact timing of things like A/D and D/A with enough dependability for reasonably quality audio.

That is why there are "voice recorder" chips and whole board sub-assemblies that are pre-engineered specifically for the task. They are optimized for recording, storage and playback.

Here are some examples (just one of many available) * Example voice recorder chips: http://www.digikey.com/catalog/en/partgroup/isd-chipcorder/12724 * Example voice recorder board: http://www.ebay.com/itm/like/252117334430

  • \$\begingroup\$ Thank you Richard sir for very use ful answer ! I don't want to record data in every system but once if I have recorded some strings then only I want these different raws of speech and I want to play these recorded speech at different time ! Like if I press 1 button then play " voice 1 " if I press button 2 then "voice 2 " ! Q \$\endgroup\$ – user103110 Apr 2 '16 at 7:12
  • \$\begingroup\$ There are commercial products that do exactly what you are asking for. Examples: sparkfun.com/products/13720 ; ebay.com/itm/… \$\endgroup\$ – Richard Crowley Apr 2 '16 at 23:03
  • \$\begingroup\$ Sir it's not about buying I want to learn and make own one! \$\endgroup\$ – user103110 Apr 3 '16 at 1:32

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