!!!NEED HELP!!!add in recorder voice in 18f4520 - Electronic Circuits Projects Diagrams Free

caltex · 10th October 2007, 01:51 PM

hi guys,

how do i add in a pre-recorder voice in the pic....and output it out through a speaker???

many thanks for your replies......

blinkstar88 · 10th October 2007, 03:04 PM

i;m absolutely no idea, anyone?

**Nigel Goodwin** · 10th October 2007, 04:28 PM

Store the audio data as a table in the program memory, them read it sequentially and play it back out through a digital to analogue converter. Don't forget the low pass filter after the D2A.

caltex · 11th October 2007, 12:01 AM

has Anyone comes across this?

**Nigel Goodwin** · 11th October 2007, 12:05 AM

Quote:

Originally Posted by caltex

has Anyone comes across this?

What part of my explanation didn't you understand?.

**3v0** · 11th October 2007, 12:23 AM

BTc PICsound One-bit sound recording/playback on a PIC

kjennejohn · 11th October 2007, 02:21 AM

Thanks, 3v0, that was a good solution for Q&D audio messages.
kenjj

caltex · 12th October 2007, 05:43 AM

Quote:

Originally Posted by Nigel Goodwin

Store the audio data as a table in the program memory, them read it sequentially and play it back out through a digital to analogue converter. Don't forget the low pass filter after the D2A.

hi, i've converted the audio data to .asm table already. The problem now is, what is the code to play the audio? how shld i write it?

sorry about it.. im quite new to programming PIC

bananasiong · 12th October 2007, 06:21 AM

Read from where you store the audio data, then use external DAC, either serial or parallel interface. You may need to amplify the converter's output.

**Nigel Goodwin** · 12th October 2007, 07:57 AM

Quote:

Originally Posted by caltex

hi, i've converted the audio data to .asm table already. The problem now is, what is the code to play the audio? how shld i write it?

Read first entry, output to D2A, delay for next byte.
Read second entry, output to D2A, delay for next byte.
Repeat until all done.

The delay time is dependent on your sampling rate.

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10th October 2007, 01:51 PM	(permalink)
caltex	!!!NEED HELP!!!add in recorder voice in 18f4520 hi guys, how do i add in a pre-recorder voice in the pic....and output it out through a speaker??? many thanks for your replies......

10th October 2007, 03:04 PM	(permalink)
blinkstar88	i;m absolutely no idea, anyone? __________________ http://www.henryelectronics.com

10th October 2007, 04:28 PM	(permalink)
Nigel Goodwin	Store the audio data as a table in the program memory, them read it sequentially and play it back out through a digital to analogue converter. Don't forget the low pass filter after the D2A. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

11th October 2007, 12:01 AM	(permalink)
caltex	has Anyone comes across this?

11th October 2007, 12:23 AM	(permalink)
3v0	BTc PICsound One-bit sound recording/playback on a PIC

11th October 2007, 02:21 AM	(permalink)
kjennejohn	Thanks, 3v0, that was a good solution for Q&D audio messages. kenjj __________________ All my pencils used to have erasers!

12th October 2007, 06:21 AM	(permalink)
bananasiong	Read from where you store the audio data, then use external DAC, either serial or parallel interface. You may need to amplify the converter's output. __________________ Superman returns..