Searching \ for 'ISD2560' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=isd2560
Search entire site for: 'ISD2560'.

Truncated match.
PICList Thread
'ISD2560'
1999\11\04@154058 by Javier

flavicon
face
Hi
Has anybody used the ISD 2560 chip, is it good ?
Sound quality compares to what ?
How can I play a message over and over again in Push Button mode, should I
use a Micro??
Any sites, maybe with an 10W amp ??
Thanks for your time
Javier

1999\11\04@172319 by Jinx

face picon face
> Hi
> Has anybody used the ISD 2560 chip, is it good ?
> Sound quality compares to what ?
> How can I play a message over and over again in Push Button mode, should I
> use a Micro??
> Any sites, maybe with an 10W amp ??
> Thanks for your time
> Javier
>

Hi, one of my very first PIC jobs was modernising some very old
fairground/arcade equipment and I elected to use the ISD chips. I
have to say I was disappointed (don't know if they've changed the
specs on newer devices). The two I tried were the 1416 and 2590.
They are convenient to use, but they cut off around 6kHz, making them
useful only for speech, especially in an environment with a lot of b/g
noise. I suspect the reason for the low top end is the write time needed
for the EEPROM. The PIC was in circuit to detect triggers from various
sources and play the appropriate sound effect.

They were scrapped (given to the kids actually) and I went over to the
TMS3477/3478 which have much better high end specs, around tape
quality on a good day. They're designed to use DRAM but can be set
to run with EPROM. My current big project, and hopefully my income
for next year, is a 3478 project using SRAM and a couple of F84s.
Price of a 3478  is less than a 2560/2590 but there's the drawback
of inconvenience, particularly for a one-off (PCB, s/w etc). However,
if it's sound quality you're looking for, the ISDs aren't in the race.

Jinx

1999\11\04@174817 by Jinx

face picon face
> Hi
> Has anybody used the ISD 2560 chip, is it good ?
> Sound quality compares to what ?
> How can I play a message over and over again in Push Button mode, should I
> use a Micro??

PS

Should have mentioned, TMS3478 can be used as an ISD device is,
ie pushbutton Rec/Play/Stop on a stand-alone PCB (does require an
amp though, TBA820M works well at 5V). S/w control isn't necessary
although it can be set to PB mode or s/w command mode. At best
speed (64kHz sampling), and very good reproduction, 3478 will use
1Mx1 DRAM for 11 sec recording. Obvious disadvantage is that
DRAM is volatile. 3478 can i/f with up to 4 DRAMs (44 sec) or clock
speed can be reduced to give longer playback with less memory,
probably 1/3rd full speed is still acceptable sound quality. Once you've
adapted it to EPROM or SRAM then memory size is infinite and just
requires bank switching in 512kB blocks.

While I'm on this, anyone know of a circuit and s/w for a 16F84 to i/f
to DRAM ? Just out of curiosity I'd like to see if I can use any of the
bucketloads of old DRAM lying about, and the possibility of using
current SIMMS (16M+) for a BIG data storage project I'm thinking of.

Jinx

1999\11\04@182853 by goflo

flavicon
face
Jinx wrote:
Parallax had an app note on using 16C55/DRAM for audio
recording/playback. Might help. http://www.parallaxinc.com

Jack

> While I'm on this, anyone know of a circuit and s/w for a 16F84 to i/f
> to DRAM ? Just out of curiosity I'd like to see if I can use any of the
> bucketloads of old DRAM lying about, and the possibility of using
> current SIMMS (16M+) for a BIG data storage project I'm thinking of.
>
> Jinx

1999\11\04@230327 by Javier

flavicon
face
Hi  Jinx
Thanks for the info, where can I find the TMS page, made a site search, but
without luck :-( .
Whats the aprox price of each unit??
How long does it take to have it runnning, ISD is quite simple !!
Bye
Javier


-----Mensaje original-----
De: Jinx <spam_OUTjoecolquittTakeThisOuTspamCLEAR.NET.NZ>
Para: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Fecha: Jueves 4 de Noviembre de 1999 19:48 p.m.
Asunto: Re: ISD2560


{Quote hidden}

1999\11\05@003627 by Jinx

face picon face
TMS should be on the Texas site somewhere, I've never needed
to look for it as I've already got data.

I was paying NZ$7 to NZ$8 per (US$4)

The basic module is a 3478, 1 to 4 DRAMs (256kb to 1Mb), audio
amp if needed and 4 pushbuttons. Not to hard to make yourself if
you can do your own PCB. My original on a 50x110 PCB is a
complete unit. Single-side will do if you can put up with a few links.
Very straight-forward. AYS though, ISD is simple but to me the
trade-off with quality was unacceptable.

The tricky bit is copying data from the DRAM into a file for export
into EPROM or SRAM for applications that require phrase selection
over and above just selecting individual DRAMs but a 10MHz PIC
copes quite easily. If necessary the DRAM can be slowed quite
considerably before data starts to be lost.

Let me know if you can't find a page and I'll scan my data and PCB,
and if you do find the page could you let me know please.

Jinx

> Thanks for the info, where can I find the TMS page, made a site
> search, but without luck :-( .
> Whats the aprox price of each unit??
> How long does it take to have it runnning, ISD is quite simple !!
> Bye
> Javier

1999\11\05@025722 by paulb

flavicon
face
Jinx wrote:

> They are convenient to use, but they cut off around 6kHz, making them
> useful only for speech, especially in an environment with a lot of b/g
> noise.

 Isn't that a contradiction?

 A bit like the absurdity of putting low-distortion audio systems into
a car.
--
 Cheers,
       Paul B.

1999\11\05@074348 by - KITS EDUCACIONAIS NACIONAIS

flavicon
face
Javier wrote:
>
> Hi
> Has anybody used the ISD 2560 chip, is it good ?

Yes! It is!

> Sound quality compares to what ?

compares to 11 Khz...

> How can I play a message over and over again in Push Button mode, should I
> use a Micro??

Yes you can! I have already done this with my ISDvoice product!

> Any sites, maybe with an 10W amp ??

See http://www.furb.rct-sc.br/~mw/isd_i.html - BRASIL

Su hermano!

Miguel Wisintainer

> Thanks for your time
> Javier

1999\11\05@103620 by Lea

picon face
At 05:32 PM 11/4/99 -0300, you wrote:
>Hi
>Has anybody used the ISD 2560 chip, is it good ?
>Sound quality compares to what ?
>How can I play a message over and over again in Push Button mode, should I
>use a Micro??
>Any sites, maybe with an 10W amp ??
>Thanks for your time
>Javier
>
Hi Javier!, I'm using actually this ISD chip, and from my point of view it
is a very
good one, there are others with more quality but requires external memory
and a lot
of hardware, this chip does need nothing else to work!, may be a Power amp :-).
The sampling frecuency of the 2560 is 8 Khz with 60 secs of audio, so I
think that
for voice applications it's very good enough.
Yes you can reproduce over and over a message, no micro is needed if are
planning to
play only 1 message (because you don't need to select which message to play,
if only one is stored on it).
I'm using LM388 and Sounds good enough for me, but only 1.5W, mm a TDA2003 comes
to my mind but it has a high current in stand by mode (about 100mA if I remember
correctly) , if you are not limited in power, this one is very easy to use and
to find in a electronic store :).
If you like, I have the entire datasheet of the ISD 2560, I can send you by
email but the four datasheets have 1.6 MBytes, I have no problem sending it
to you email address, if you like it, let me know, or we can meet on IRC and
make a DCC send file transfer too, as you prefer.
Oops!, I forgot one thing, the reason because I choose the ISD chip was the
EEPROM memory, if you lose power the message remains on it, and even if part
of the bits erases with time, the message will be still playable, only the
quality is affected, but it will keep working. very nice isn't it?.

Hope be helpful.
see you.

  Leandro J. Laporta (LU2AOQ)
  mail: .....lu2aoqKILLspamspam.....yahoo.com
  wrk: Arg. Assoc. for Space Technology.
  ham: TCP/IP high speed group HSG


__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com

1999\11\05@121706 by noodlehed

picon face
I've been recently playing around with the ISD 4002 and 4003.  They are
easily interfaced with a PIC to allow for multiple message addressing.
However, you may need an external EEPROM to store the address table, unless
using a larger PIC such as the 877.  The version I have records 2 mins. of
audio @ 8KHz.  They make 4 KHz versions with twice as much recording time,
but there is a noticable depreciation in sound quality.  Obviously, in some
apps using a micro may be overkill.  What you working on, anyway?

{Original Message removed}

1999\11\05@121914 by noodlehed

picon face
Oh, BTW there are datasheets on all the ISD soundchips located at
http://www.questlink.com.  For those who don't have this site in your links go
check it out.  There are *thousands* of chip diagrams, datasheets and
appnotes.

-----Original Message-----
From: pic microcontroller discussion list
[EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU]On Behalf Of Jinx
Sent: November 5, 1999 12:12 AM
To: PICLISTspamspam_OUTMITVMA.MIT.EDU
Subject: Re: ISD2560

More... (looser matching)
- Last day of these posts
- In 1999 , 2000 only
- Today
- New search...