Hi Vasile, In my time a birth was still followed by a placenta, nowadays an iphone comes after. regards Hans
Op vrijdag 25 februari 2022 om 13:34:14 UTC+1 schreef vasile: > Hi Hans. Congratulations for your young mind! There aren't many people > programming at your age. > You are a great example! > > On Fri, Feb 25, 2022 at 10:16 AM hans <hansvanve...@gmail.com> wrote: > >> Hi Vasiele and others. >> I was born before the last world war and I suspect most of you after it. >> I hope it stays that way!! >> Great, I can study today again. Thank you. >> >> Op vrijdag 25 februari 2022 om 06:58:52 UTC+1 schreef vasile: >> >>> Kiste, not only the ZX81 but Sinclair Spectrum and most of it's clones >>> did the same. >>> The biggest problem was the tape speed variation (among the volume >>> variation which was corrected in romanian clones -and we had more than any, >>> I recall 5 different types). >>> >>> Hans, on the actual PIC18 series on which JAL works ( presuming you will >>> do with JAL) you might have some sampling speed issues. You need at least >>> 7.5us for an ADC sample and according to Nyquist theorem you need not 2x ( >>> which is pure theoretical) but at least 4x faster sampling than maximum >>> frequency you are recording. >>> After your AD is sampled, the PWM is not an issue, but you might >>> experience a small delay between real recorded speech and the PWM filtered >>> one. >>> If you plan to add voice for your puppet, then limiting to 4KHz may be a >>> good choice. >>> >>> best wishes, >>> hopefully not WW III, but in pace for playing nice... >>> >>> On Thu, Feb 24, 2022 at 10:38 PM 'Oliver Seitz' via jallib < >>> jal...@googlegroups.com> wrote: >>> >>>> Hi Rob, >>>> >>>> connecting two PICs is not like an audio recording. Better connect the >>>> pic to your soundcard to record and then playback, that way you'll get >>>> something similar to a tape recorder. >>>> >>>> The difficulties when using audio equipment are (at least): >>>> >>>> - only alternating current is transmitted >>>> - the volume is never exactly the same >>>> - the frequency range is limited to like 100Hz-10kHz >>>> - the line level voltage is less than 1V >>>> >>>> Reading should be possible by most PICs which have comparators. Only a >>>> resistor is needed, then you can detect zero crossings. >>>> >>>> The Sinclair ZX81 used audio equipment as storage. A burst of three >>>> oscillations coded a zero, five coded a one. The output was low-pass >>>> filtered. You usually had to try loading a program several times, slightly >>>> adjusting the volume, until you got lucky. >>>> >>>> Greets, >>>> Kiste >>>> >>>> Am Donnerstag, 24. Februar 2022, 19:56:01 MEZ hat Rob CJ < >>>> rob...@hotmail.com> Folgendes geschrieben: >>>> >>>> >>>> Hi Hans, >>>> >>>> If I understand you right the only thing you want to do is to record a >>>> signal or a sequence of signals on a casette player that can be used to >>>> trigger something when the recording is played back right? >>>> >>>> If my initial suggestion would work - which may work since I have the >>>> idea that my Apple II did more ore less the same thing - I could give it a >>>> try to do a proof of concept. >>>> >>>> I may have a the problem that I do not have a casette recorder but I >>>> could fake it by just connecting two PICs to see if that works. The final >>>> test could then be done by you. >>>> >>>> Which PIC type are you using? >>>> >>>> Kind regards, >>>> >>>> Rob >>>> >>>> >>>> >>>> ------------------------------ >>>> *Van:* jal...@googlegroups.com <jal...@googlegroups.com> namens hans < >>>> hansvanve...@gmail.com> >>>> *Verzonden:* donderdag 24 februari 2022 17:07 >>>> *Aan:* jallib <jal...@googlegroups.com> >>>> *Onderwerp:* Re: [jallib] PWM serial audio transmission >>>> >>>> Another piece of text: >>>> So far I've done everything with MIDI. I used one midi channel for the >>>> actions with a general command type. Then 2 data, one for the device nr >>>> (16) and one for the command. (0-128) >>>> This has worked well for years, but it does require a complete MIDI >>>> sound package. >>>> >>>> Op donderdag 24 februari 2022 om 16:55:46 UTC+1 schreef hans: >>>> >>>> Hey , >>>> I have tried a circuit with an MT8880 but the ICI has failed. I did >>>> hear the 16 tones, but when I wanted to receive them, the chip gave up the >>>> ghost. >>>> In theory I understand your suggestions well, but developing something >>>> like this is not easy for me. I'm just a LEGO builder. >>>> regards >>>> Hans >>>> >>>> Op woensdag 23 februari 2022 om 19:30:37 UTC+1 schreef >>>> rob...@hotmail.com: >>>> >>>> Hi Hans, Kiste, >>>> >>>> You can still by DTMF decoders and I assume also DTMF encoders. Just >>>> look at for example Aliexpress and type DTMF. >>>> >>>> But another suggestion. Many, many years ago I had built an Apple II >>>> and I used cassette tapes to store and load games which was using tones >>>> generated by the Apple II itself using two tones, one for high, one for >>>> low >>>> and one as a lead-in tone (not sure in the lead-in tone was another tone) >>>> to synchronze the start of the recorded program. You would not need this >>>> lead-in tone in your case >>>> >>>> So I think it may not be that complex: >>>> -) For recording on casette, generate this dual tone by the PIC via >>>> PWM or maybe it is also sufficient to generate one tone in case of a 1 and >>>> no tone in case of a 0 but I think this will be less reliable. >>>> -) For playback, measure the length of the recorded PWM tone. If is is >>>> within a certain range you accept it as a one and in case of two tones the >>>> lower tone could be zero and the higher tone is one. >>>> >>>> As long as the tone frequency is not too high, I think this could work. >>>> >>>> A more advanced solution would be to use a phase locked loop (PLL) but >>>> I am not sure if it will work. The PLL locks to the input signal so the >>>> voltage that controls the oscillator goes up and down to follow (lock on >>>> to) the input signal and this oscillator voltage signal could then be used >>>> by a comparator of the PIC to detect a high or low tone. You can also use >>>> the oscillator of the IC to generate the two tones by controlling the >>>> oscillator voltage by the PIC. A typical IC for that is the HEF4046. I >>>> have >>>> used this IC many many years ago too. This solution may be bit over the >>>> top >>>> since you only want a kind of trigger signal >>>> >>>> But maybe the first solution is more doable. Just give it a try. >>>> >>>> Kind regards, >>>> >>>> Rob >>>> >>>> ------------------------------ >>>> *Van:* 'Oliver Seitz' via jallib <jal...@googlegroups.com> >>>> *Verzonden:* woensdag 23 februari 2022 09:58 >>>> *Aan:* jal...@googlegroups.com <jal...@googlegroups.com> >>>> *Onderwerp:* Re: [jallib] PWM serial audio transmission >>>> >>>> Hi Hans, >>>> >>>> 20 years ago I would have suggested using DTMF, but the decoder chips >>>> are rare these days... >>>> >>>> PIC controllers include various peripherals which can be used to encode >>>> and decode DC-free signals (which, apart from the frequency below, say, >>>> 10kHz, is the requirement to be recorded as audio). On/off keying or >>>> frequency shift keying are the easiest, I think. Which chips are you going >>>> to use? >>>> >>>> Greets, >>>> Kiste >>>> >>>> Am Mittwoch, 23. Februar 2022, 09:15:43 MEZ hat hans < >>>> hansvanve...@gmail.com> Folgendes geschrieben: >>>> >>>> >>>> Hello everyone, >>>> I have been trying for a long time to place a serial signal on one >>>> track of an audio recording which I can read afterwards. To make all kinds >>>> of things happen at the same time as the audio is played. I have now tried >>>> to do this with the old modem system ( TCM3105) but it failed hopelessly. >>>> I >>>> read that there are also systems to do this using PWM. 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