> (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.

>
> 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:
>  >>  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.
>
>  >>  --
>  >>  http://www.piclist.com hint: The list server can filter out subtopics
>  >>  (like ads or off topics) for you. See http://www.piclist.com/#topics
>
> __________________________________________________________
>
> --
> http://www.piclist.com hint: The list server can filter out subtopics
> (like ads or off topics) for you. See http://www.piclist.com/#topics

> Hi, after all the discussion recently about doing
> sound on a PIC, 1bit systems etc, I came up with an
> idea to refine the process of 1bit encoding to be
> PIC friendly and it actually worked. It's fast enough
> to do 16bit to 1bit conversion real time at up to 156
> kbit/sec! It also gives good results with speech even
> with quite low bitrates. Great for making cheap
> talking remote controls and stuff for the visually
> impaired.
>
> Playback only requires one or two digital output pins
> and RC filter and very simple bitstream code.
>
> I played with a few systems, but the encoder that worked
> best was a closed-loop math model of the RC filter.
> Each new bit is decided by generating a possible
> hi and lo bit result, then models the analogue voltage
> that would occur on the RC filter, and picks the bit
> that gives the result closest to the original wave.
> Being closed loop simulation it follows the original
> wave quite well and gives good sound quality for
> low bitrates and very little record or playback
> hardware.
>
> 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.
>
> Then one button press to write the encoded bitstream
> to a data file or even a PIC .asm file with the
> sound data already formatted in "retlw" table
> format. You get a few seconds of speech on a 8kb
> PIC. Handy. :o)
>
> 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. One thing I want to add is a RC filter attached
> to the PC parallel port, so I can hear the sound
> on identical hardware to the product, and know
> exactly how it will sound when the PIC plays it
> back later in the product.
>
> I wanted a system where I just had to push one
> button to add any sound or speech to any of my
> PIC projects, and it's pretty close to that. With
> the ability to record too, hmm, now I just need a
> few Mb of fast static ram...
> -Roman
>
> --
> http://www.piclist.com hint: The list server can filter out subtopics
> (like ads or off topics) for you. See http://www.piclist.com/#topics

> >>  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:
>  >>  >  >>  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.
>  >>  >
>  >>  >  >>  --
>  >>  >  >>  http://www.piclist.com hint: The list server can filter out
>  >>  subtopics
>  >>  >  >>  (like ads or off topics) for you. See
>  >>  http://www.piclist.com/#topics
>  >>  >
>  >>  > __________________________________________________________
>  >>  >
>  >>  > --
>  >>  > http://www.piclist.com hint: The list server can filter out subtopics
>  >>  > (like ads or off topics) for you. See http://www.piclist.com/#topics
>
>  >>  --
>  >>  http://www.piclist.com hint: The list server can filter out subtopics
>  >>  (like ads or off topics) for you. See http://www.piclist.com/#topics
>
> --
> http://www.piclist.com hint: The list server can filter out subtopics
> (like ads or off topics) for you. See http://www.piclist.com/#topics

>
> 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.

> > >  >>  >  >>  > 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.
> > >  >>  >  >>  > http://centauri.ezy.net.au/~fastvid/picsound.htm

> > David Harris wrote:
> > >
> > > Hi Roman -
> > > Great site, great implementation.  What do you think of my idea of using a SPI
> > > serial eeprom?  You can set up an address, and then just clock the eeprom (with
> > > PWM) and feed the output to the RC filter.
> > > David
> >
> > Hi David, I didn't think of that. I currently
> > use I2C eeprom in another project but of course
> > that needs an ack bit after every 8 data bits.
> > So the SPI doesn't need an ack? I'll have to get
> > a SPI eeprom datasheet and have a look. don't
> > they still have to stop and wait for the write
> > cycle at some point? At 15625Hz the 5mS write
> > delay is only 78 bits, less than 10 bytes. So it
> > wouldn't be hard to do recording too with the
> > eeprom with a 16 or 32byte buffer.
> > -Roman

> David Harris wrote:
> >
> > I'm interested in sound for model trains -- your stuff is just the ticket -- I had
> > thought of similar, but folding the filter into the calculation is brilliant!
> > David
>
> Thanks! Sounds like a perfect app for one-PIC
> sound playback. Choo choo! :o)
>
> I'd like to hear any feedback you have on using
> my PIC sound stuff, if you use it that is. Using
> a SPI eeprom will work well, but aren't they only
> 8kbyte?? Maybe it's better to use a 8kword PIC like
> a 16F876, with the data stored as 14bits instead of
> 8. I think Scott D. mentioned this idea recently.
> With about 7500 words, at 14bits is 13125 BYTES
> of storage and all in one PIC. Just a thought.
>
> I'd be happy to put up any of your work on the
> PIC sound encoder webpage:
> centauri.ezy.net.au/~fastvid/picsound.htm
> -Roman
>
> > > David Harris wrote:
> > > >
> > > > Hi Roman -
> > > > Great site, great implementation.  What do you think of my idea of using a SPI
> > > > serial eeprom?  You can set up an address, and then just clock the eeprom (with
> > > > PWM) and feed the output to the RC filter.
> > > > David
> > >
> > > Hi David, I didn't think of that. I currently
> > > use I2C eeprom in another project but of course
> > > that needs an ack bit after every 8 data bits.
> > > So the SPI doesn't need an ack? I'll have to get
> > > a SPI eeprom datasheet and have a look. don't
> > > they still have to stop and wait for the write
> > > cycle at some point? At 15625Hz the 5mS write
> > > delay is only 78 bits, less than 10 bytes. So it
> > > wouldn't be hard to do recording too with the
> > > eeprom with a 16 or 32byte buffer.
> > > -Roman
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads