Hi all,

One and  a half years ago, we used a multimedia card (MMC) for storing and
playback of data. It uses a serial interface(also supports SPI) and is
easily interfacable with a PIC. They could be handy if one wants a cheap
removable storage solution. And could be useful to record lots of speech
esp. your 1 or 1.5bit data.
Roman, your speech encoding technique was very good.

Regards,
Somasundaram.

 http://www.mmca.org/ or http://www.sandisk.com could be of help if someone
wants to know more about MMC.

----- Original Message -----
From: "Roman Black" <fastvid@EZY.NET.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, December 20, 2001 3:46 AM
Subject: Re: [PIC]: PIC speech system (+free software)


> Richard Sloan wrote:
> >
> > I mean can we record and store the 1 or 1.5bit data? can it be done
without buffering?
>
> Sure you can record depending on what medium
> you are using for storage. I2C eeprom is probably
> ok depending on what bitrate. Parallel ram with
> a simple counter is much faster and you could
> record multiple waveforms. No buffering is needed,
> the calc is performed quickly on each BIT, then
> the bits are just stored.
> -Roman
>
>
> > >>  Yes, the PIC can record fine if it has an 8bit
> >  >>  or better ADC input. A '628 might be the PIC for
> >  >>  the job. Stereo, even multitrack recording is easy
> >  >>  at normal frequencies.
> >  >>  -Roman
> >
> >  >>  Richard Sloan wrote:
> >  >>  >
> >  >>  > Very nice Roman, did I miss something or can you record with the
PIC
> >  >>  also?
> >  >>  >
> >  >>  >  >>  Sorry! Forgot to give the webpage where you can get
> >  >>  >  >>  the software:
> >  >>  >  >>  http://centauri.ezy.net.au/~fastvid/picsound.htm
> >  >>  >  >>  -Roman
> >  >>  >
> >  >>  >  >>  Roman Black wrote:
> >  >>  >  >>  > (playing speech audio on a PIC)
> >  >>  >  >>  > I wrote some software that shows the waveform and
> >  >>  >  >>  > the encoder waveform, with some adjustments to the
> >  >>  >  >>  > encoding parameters. It models the RC filter and
> >  >>  >  >>  > even tells you values of R and C to use.
> >  >>  >  >>  >
> >  >>  >  >>  > It's really a "PIC sound suite" that allows you to
> >  >>  >  >>  > load your own sound waveforms in, view them, try
> >  >>  >  >>  > different encoding formats and and see how the
> >  >>  >  >>  > sound will turn out as it is plotted on screen.
> >  >>  >  >>  > Then dump the bitstream data straight into your
> >  >>  >  >>  > PIC.
> >  >>  >
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