Continuous Variable Slope Delta Modulator - HC55564

Jeri shows how to build a CVSD audio compression codec in an FPGA.

• Category

  Education

[Kurt C]

You could use a audio codec to do the same right, probably way cheapter and less complicated than fpga. u have digital data from the processor , just need the analog conversion.

[jeriellsworth]

No. The CPU supplied the data in this delta serial format.

[Miles Goodhew]

Jeri, great work!

Mostly joking: Don't suppose you know how a Toshiba T6721A works (As in Commodore Magic Voice)?

[jeriellsworth]

I haven't looked at it before. I've always dreamed of reverse engineering one of the speech chips.

[CampKohler]

Wow, that was a lot of work to replace a chip! Couldn't you have just put out the word that you were looking for one and wait to see if one of us drooling cretins would offer it up as a present to our electronic goddess?

[jeriellsworth]

It was more about doing it. I probably have a junk pinball board with one on it here.

[Jac Goudsmit]

I expect every High Speed pinball machine that's repaired like this to have a little sticker that changes the sign at 5:02 into "Drive 555 and stay alive". :-)

[Shandybrother]

where have you been, we missed you!

[Chris Andrews]

WOW, thats good its explained well.

[Fran Blanche]

Absolutely top notch Jeri!  And I love the coat of arms! Who are the people in the photo with you? just curious.....

[DirtyAssa]

Hi Jeri I watched this! I'm just wondering how I could build some compression units for my almost hopeless music playing needs! I didn't understood all too well but the compression happened I heard it at last! I'm not even started the effect building we talked before! I seen some compression chips at Small Bear Web Shop few days ago and I wondered how I could use those but only few seconds! I'm trying to build a tube amp just now but it even hard to get all parts! Transformers I've already! Assa

[Kurt McAlpine]

I'm not educated enough to understand this.

[TheLightningStalker]

Anyone ever told you you sound like Michael Jackson?

[Bigbill Phelps]

cool fix up.i'm not really a big pinball fan.would it be sacrosanct to change all them bulbs for leds ?

[keoni29]

That is awesome

[james90751]

i've noticed that intelligent people often have very low penmanship skills. you are no exception