8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic

8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Wed, 07 Jan 2009 14:36:28 -0800 Wed, 07 Jan 2009 14:36:28 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html I have already discussed about the Roman Black's BTc Algorithm.. here is a working demo of it.. I know there might be some modifications needed with the design and some other modifications..
This one i directly input the sound from controller to my MIC and recorded it.. no coupling used.. I am still looking for a speaker which can play the sound with good volume level (suggestions needed). also i need suggestion to make a good audio circuit

I am actually thinking to make a talking clock.. so in my sample program.. i counted from 1 to 59

and its working pretty well.. the code is about 24KB (including all sound samples)
here is a demo of The Talking 8051.

http://www.8051projects.net/sound/count.mp3

Please compromise with the voice quality after all.. its an 8-bit controller

]]> Fri, 07 Sep 2007 06:03:58 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html

Are u going to put it to project section??

i realy want to learn about it

]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Sep 2007 07:37:48 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html 1. you can use 2" 0.5Watt speaker
2.for more audio you can use LM386 as an amplifier also i heard the sound i think a LPF is needed

PCB - for amplifier

please use 0.1 uf capacitor as coupling capacitor to input

]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Sep 2007 11:49:58 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html just wait a while..

]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Sep 2007 11:24:27 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html
Its been 6 months since you posted this idea, any new developments in this regard,and when can we seen the project/algorithm

bye

arun]]> contact@nospam.com (Ajay Bhargav) Mon, 31 Mar 2008 19:05:19 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html

even though this method is not so good but i had to use it..
there is still more space for advancements, i am not getting enough time. busy in some other projects..]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 01:50:03 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html I think this has been done as a project in my college as "uC based watch for the visually handicapped".
As far as i understood it, 2 cards had been used with stored sound bytes and these were picked up by the uC and played from those pre specified locations.
The 2 cards they used were 100% bought (could make out when i saw it) but itseems they had done the rest of the interfacing and coding.
I could try looking into it if u need some more specifics! (For that il have to hunt in the my dusty dingy college library)

]]> contact@nospam.com (Ajay Bhargav) Mon, 31 Mar 2008 19:53:47 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html

]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 00:17:28 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html http://aplusindia.net/aplusindiauser/ShowProductAction.apu?cat_id=51]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 05:24:12 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html For 64us,TH0 =0xFF,TL0 = 0xC0.
Also put your main routine beyond 13H or the ISR space will be overwritten by your main.]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 07:50:07 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html
$MOD51

OUT EQU P3.0

DSEG
ORG 0020H

COUNT: DS 1

CSEG

ORG 0000H ; ON RESET

JMP MAIN

ORG 000BH ;Timer Interrupt0

JMP PLAY

MAIN: MOV SP,#40H
MOV COUNT,#00H
MOV DPTR,#VOICE
MOVC A,@A+DPTR
MOV TMOD,#02D
MOV TH0,#0E0H
MOV TL0,#00H
SETB EA
SETB ET0
SETB TR0

LOOP: SJMP $

;***********************************************************************************
; ISR FOR TIMER0
;***********************************************************************************

PLAY:
INC COUNT
MOV R3,COUNT
CJNE R3,#09D,ACTION
MOV COUNT,#00H
INC DPTR
LINE1: CLR A
MOVC A,@A+DPTR
CJNE A,#99H,ACTION
MOV DPTR,#VOICE
SJMP LINE1

ACTION: RLC A
MOV OUT,C
RETI

;***********************************************************************************

ORG 0250H

VOICE: DB 00000000b ; 00
DB 00001110b ; 0e
DB 01111011b ; 7b
DB 01001100b ; 4c
DB 10101101b ; ad
DB 01001101b ; 4d
DB 01110101b ; 75
DB 00000101b ; 05
DB 01011101b ; 5d
DB 10101010b ; aa
DB 01010101b ; 55
DB 10101101b ; ad
DB 01001010b ; 4a
DB 10100100b ; a4
DB 10110001b ; b1
DB 01000101b ; 45
DB 01111001b ; 79
DB 11000111b ; c7
DB 00111101b ; 3d
DB 01000011b ; 43
DB 01010101b ; 55
DB 11000111b ; c7
DB 00011100b ; 1c
DB 01110001b ; 71
DB 10001110b ; 8e
DB 00110000b ; 30
DB 10100111b ; a7
DB 00111001b ; 39
DB 11001111b ; cf
DB 00011010b ; 1a
DB 11111000b ; f8
DB 11000010b ; c2
DB 99H
END

i don't know what the problem is, the result is some hissing noise i get from speaker.
iam using Xtal 12Mhz, interrupt is generated every 32uSecs i,e 15625Hz.

the data table is very large i've inserted only a block here, i am using 99H as EOC checking. can some one point out the bug ( i am doubting the Timer0 ISR)

arun
]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 06:26:47 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html
thankx for the early reply !

1) this is how i calculated delay time : T= 1/15625 = 64u Sec , 64/2 (half of it) = 32uSec high portion and 32usec Low portion of the pulse. i may be wrong

2) iam using Timer0 in mode 2- Auto reload ,8bit timer mode ,so that the uC doesn't have to reload T values every time (saves time)

3) about the ISR for Timer0 , there is only one Line instruction i,e JMP Addr at the Interrupt Vector space , so no question of Overwriting

4) i am using 99h as check for End of Character (EOC), this value may be present in the data table causing premature exit of the program. what other Value or character can i use to know the end of Data table

Good News, i have changed the interrupt delay from 32 uSec to 64uSec and i could hear 8051 talk for the first time

sound Quality is bit rough but speech is understandable! Cheers to ROMAN BLACK

Arun
]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 10:24:10 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html
no need to use 1.5 bit algo, use 1 bit algo instead.

in my first post i used 1.5 bit algo and there is lot of beeping sound in the o/p. this sound can be significantly removed if we are using 1bit algo. simply replacing series of 1's with 0's.. i mean look for FF in data and replace it with 00.

Only thing we need to work on is.. sound quality..or any external thing we can do to improve the quality.
]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 10:32:00 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 11:32:50 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html ]]> contact@nospam.com (Ajay Bhargav) Tue, 01 Apr 2008 11:40:16 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html

]]> contact@nospam.com (Ajay Bhargav) Wed, 02 Apr 2008 02:45:30 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html ]]> contact@nospam.com (Ajay Bhargav) Wed, 02 Apr 2008 02:51:57 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html ]]> contact@nospam.com (Ajay Bhargav) Wed, 02 Apr 2008 07:07:19 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html HI,

to remove the Hi-freq, i have used 2 stage LPF with and inductor, for my particular Playback Rate i have used something like this:

--------4.7K--------- * ---------1.5k--------* ---------1.5uH(indcutor)------>To Amplifier
' '
' '
' '
= ( 220nf) = (100nf)
' '
' '
' '
Gnd Gnd

with this circuit iam able to remove most of the squeal, in the Amplifier i completely turndown the Tone control and Set Bass to mid way.

Hey guys , my problem of finding End of Character (EOC) at the end of table still remains unanswered ! what value can i use to Check the End of table so that i can Loop the Message]]> contact@nospam.com (Ajay Bhargav) Wed, 02 Apr 2008 18:29:09 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html Or if you know he total no. of sound bytes you could use a counter set to that value, decrementing it with each byte played.]]> contact@nospam.com (Ajay Bhargav) Thu, 03 Apr 2008 02:57:06 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html Thankx Sashi,

i'll try that, BTW i was thinking of using the spare timer to keep track of the length of

the message ,if i know the duration of the message played for eg. 5 secs, i can reload

the DPTR to the first value of the table after completion of 5 every secs . to get 5

sec delay i could use a tick of 50msec(interrupt @ of 50mSec) and a counter for 100

will give 5000msecs.

arun
]]> contact@nospam.com (Ajay Bhargav) Thu, 03 Apr 2008 05:34:47 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html
as posted earlier i have success with BTC encoder using 8051 single port pin playback,

the audio file is sampled at 15625Hz, played back on a port pin @15625 bits per sec,

the BTC encoder outputs the audio into stream of 1 bits which need to be played back

using interrupt

now i want to playback using a 8 bit DAC, to playback the BTC encoder 's 1-bit stream

but i have few doubts :

1) instead of playing 1 bit at a time @ of 15625 Hz, can i play 8bits @ 15625/8 Hz i,e

1953 Hz ? will this give same output

2) will using DAC improve playback clarity ?

Arun]]> contact@nospam.com (Ajay Bhargav) Fri, 25 Apr 2008 13:01:20 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html Hello think tanks ,

any comments on my last post

Arun]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Apr 2008 00:15:08 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html can be a good project if you can implement playing a wav file stored in eeprom and then playback using 8051

also you can try recording also.. via adc, sample it at 8k and then store that 8-bit data

]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Apr 2008 04:50:45 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html Thanks Ajay

Arun]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Apr 2008 16:00:04 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html Wave files are resampled at 8KHz and converted to SND then are stored in eprom(27c256/512/1024)
Obviously this is usefull only for short sound.
Regards

P.S.
If someone want play with it i have the schematic somewhere]]> contact@nospam.com (Ajay Bhargav) Sat, 26 Apr 2008 16:11:10 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html
since past 2 weeks i have been working on Roman black's BTC encoder since i didn't want to give up so easily, here are my findings :

1) the output file by the encoder is nearly 1/8th size of the original file - how does he do it? simple , 8:1 Compression , he selects the first MSB of the 8 bit sample and knocks off the remaining 7 bits of the sample byte.

2) clarity Issues - the clarity we get when a sound is played at 8Khz with 8bit sampling can be achevied on BTC but you have to choose to sample it at a very high rate of 48Khz (i,e 8 times faster) to get the same clarity, again you this won't reduce your output file size,

for eg: 1 sec sound at 8Khz, 8 bit has 48,000bits file size same with BTC encoder a 1sec sample at 48Khz rate has 48,000bits file size. so if you want clarity then your BTC doesn't Help you reduce the file size

3) don't get carried away when you select sample rates like 15,625Hz, 22,050Hz etc in BTC options - a 8Khz, 8 bit sample sounds a lot better than 15,625Hz,1 bit BTC sample Why ? in reality it BTC plays the sample at 15,625/8 Hz rate i,e 1,953Hz , 8 bit sample which is creepy when compared to original 8000Hz, 8bit sample

1) instead of playing 1 bit at a time @ of 15625 Hz, can i play 8bits @ 15625/8 Hz i,e

1953 Hz ? will this give same output

i got my answer, YES, it can be played but it gives same harsh sound quality.

hope these findings might help someone

Arun]]> contact@nospam.com (Ajay Bhargav) Mon, 12 May 2008 11:39:37 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html ...do reply...thanks in advance..]]> contact@nospam.com (Ajay Bhargav) Sat, 24 May 2008 19:40:49 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html GioppY wrote ...

Years ago i built a simple(no uC, only counter and eprom) wave player.
Wave files are resampled at 8KHz and converted to SND then are stored in eprom(27c256/512/1024)
Obviously this is usefull only for short sound.
Regards

P.S.
If someone want play with it i have the schematic somewhere

hey Gioppy,
I would certain;y like to see how u stored it in the eprom without a uC

.
Can u send me the schematic or tell me about the logic?
thanks in advance

]]> contact@nospam.com (Ajay Bhargav) Sat, 24 May 2008 22:54:18 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html http://web.telia.com/~u85920178/eprom/wave_00.htm]]> contact@nospam.com (Ajay Bhargav) Sat, 24 May 2008 23:53:52 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html anyways the idea is cool. will try it out sometime.]]> contact@nospam.com (Ajay Bhargav) Sun, 25 May 2008 00:21:54 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html I would certain;y like to see how u stored it in the eprom without a uC .
Easy! The eprom must be programmed with an external programmer.
The 27Cxxx eprom seriers are UV erasable electrically programmable eprom

]]> contact@nospam.com (Ajay Bhargav) Sun, 25 May 2008 04:15:39 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html ]]> contact@nospam.com (Ajay Bhargav) Sun, 25 May 2008 04:41:17 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html contact@nospam.com (Ajay Bhargav) Sun, 25 May 2008 13:27:42 -0700 http://www.8051projects.net/forum-t2092.html Re: The Talking 8051!!-audio on 8051 http://www.8051projects.net/forum-t2092.html really impressed..

]]> contact@nospam.com (Ajay Bhargav) Sun, 25 May 2008 18:33:16 -0700 http://www.8051projects.net/forum-t2092.html