The Linux boot loader GRUB allows one to fire the "PC Speaker" with tones and pauses. I boot up with Für Elise and Close Encounters on one of my machines.
It will probably sound ratty. Telephone systems work at 8 bits, but the coding is nonlinear.
John
Nowadays soundcards are not that expensive any more :-)
-- Frank Buss, http://www.frank-buss.de piano and more: http://www.youtube.com/user/frankbuss
_One_ bit (at something like 8kHz sample rate) is enough to be understandable, IIRC, but it's not pretty.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I've always been fond of delta modulation for simple-minded audio...
particularly the adaptive variations. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
Remember: Once you go over the hill, you pick up speed
Isn't that what is used in most of the toy sound effect chips? I did a project with some OTP ones some years back and I think it was a form of delta modulation that was not only very simple, but kept the ROM requirements relatively reasonable.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I think so.
I first ran onto the concept in the late '60's for some telephone chips.
The adaptive variations, which can change slope via an algorithm that looks at repetitive patterns of zeros or ones, can sound quite nice. Like the Motorola MC3417 Continuously Variable Slope Delta Modulator...
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
Remember: Once you go over the hill, you pick up speed
Many years ago, before there even _were_ sound cards, I got some advertising disk which when run, would play some herald trumpet fanfare over the PC (one bit) speaker.
And yes, it was a little ratty, but recognizably brass instruments.
It's not that hard to do - just play your audio into a comparator, and time the intervals between zero-crossings.
Cheers! Rich
Yes, no problem. I've just listended to unmodulated white noise:
If you have two wave files, one with white noise and one with the signal with which you want it to modulate, you could use my Modulator program to produce the modulated signal:
Would be easy to extend it for realtime sound output.
-- Frank Buss, http://www.frank-buss.de piano and more: http://www.youtube.com/user/frankbuss
Why not? As long as the maximum frequency below 20kHz (or so), You might ask Bob Masta... he looks like a sound card expert!
George H.
You mean this OUT command, which writes data to a port, from the Intel OUT assembler command and the qBASIC which runs in DOS? Maybe you should change to VB.NET. Visual Studio Express Edition is free for private and commercial use, after a registration at Microsoft. I don't know qBASIC, but it was from Microsoft, so maybe it looks a bit like VB.NET. And you'll get tons of examples and help for VB.NET.
A short search results in this example for realtime sound output for VB.NET:
I didn't tried it, but the source code looks clean and easy to change, e.g. in Oscilator.vb you can write your calculation of the samples in GenerateSample.
-- Frank Buss, http://www.frank-buss.de piano and more: http://www.youtube.com/user/frankbuss
On Feb 7, 11:25=A0am, "Ken S. Tucker" wrote: ...
Speech (phoneme creation) is more than simple modulation, it is filtering through mechanical resonators as well. back in the days when I played with analog music synthesizers, we could make 'speech" by using a combination of voltage controlled amplifiers, voltage controlled filters, and ring modulators. Would be interesting to see how you could implement control of these in basic.
Quickbasic has a sound command for the system speaker. I've used it to add audio signals to automated test fixtures. A unit that passed sounded like you had just won a video game. A foghorn announced any failure. ;-)
BTW, do you need any Centronics printer cables for your project? Just pay shipping. I probably have 50 at the moment. They will end up in the recycling bin before long.
-- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated.
The idiot still has a garage full of hoarded JUNK.
You should have at least kept the good, worthy crap, and not the beyond worthless shit.
No problem. I just hate to toss those 25 foot cables into the scrap copper barrel.
-- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated.
Another morph for dum-dum.
THE DIMBULB SCORECARD
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90 UltimatePatriot UpGrade UpYerNose ValleyGirl VioletaPachydermata WallyWallWhackr WallyWallWhackr WarmUnderbelly WhySoSerious? 100WattDarkSucker 100-- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated.
ect?
l end up
scrap
Are you becoming a member of the Archie/Dimbulb fan club?
Go away, and do not return until your mental age reaches 25.
Comply, and we will not see you ever again, you immature twit!.
I still give away a lot of stuff, but most is at the local level. I've had people walk in and bet me $20 that I didn't have an oddball 50 year old part. I always had what they needed, so after a while they got tired of paying a couple dollars + the $20 when they lost the bet. I have a 1200 Sq' garage and an 18' * 28' storage building where I repair things to give away, and store parts from things not worth fixing. I started 45 years ago, as a teenager.
-- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated.
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