PSP Oscilloscope

Demonstration d'une PSP transformé en Oscilloscope.
Vidéo envoyé par PSPGEN.

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Science & Technology

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• pspgen
• oscilloscope
• video
• oscillo
• psp2004
• site
• demonstration
• psp
• gen
• playstation

[umloginqualquer]

@Gintaras I am aware these onboard sound solutions can sample input in a much lower rate than output (users don't use recording features much, but they listen a lot, so engineers cut the sampling rate of the ADC), that's why I said I don't believe they would go beyond requested by Nyquist.

About your dsPIC with 2Msample/sec, just... wow.

I have recently bought a lot of AVR's atmega48 which sample rate I'm not sure, so I guess I'll use an external ADC ic if their sample rate is bad :P

[umloginqualquer]

@Gintaras I believe this effect is called beat or beating. Look for 'beat acoustics' on wikipedia.

Sampling frequency is higher indeed (at least twice, as Nyquist said) and I'm aware of some high-end soundboards used by musicians with sampling rate of up to 88ksample/second, but these are expensive high-end desktop boards, not our usual onboard solutions. Since most people won't hear above 20khz, it's usual to have 44khz sampling on many mp3 files (a little more than required by Nyquist's Law)

[Gintaras]

@temporario3 The sampling frequency is usually higher to produce best possible quality, for example, I'm not sure how this effect is called, but when you play 2 notes, let's say 1 note is 40kHz and the other is 41kHz, this will produce 3rd note, playing at 1kHz, and it's now hearable. It's the same effect used by LRAD and hyper sound speaker. As for scope, I decided to use dsPIC microcontroller, it has ADC that takes 2 million samples per second, cool stuff.

[temporario3]

@Gintaras I am also planning on doing something similar. I've heard of some software called zelscope which would enable me to worry only about the buffering and amplifying the signal before feeding it to the pc. But I didn't knew the pc could sample at 40kSample/s, I thought it was much less because it's intended to voice, and voice frequency is way lower than 20khz. I also didn't knew the PSP had a mic input. It would be SO good if there was such software for Symbian S60v5...

[alintraxxx]

where can I get and use software and the interface to PSP?com or analog audio imput

[axelDodge]

ce n est qu un oscilloscope pour pc raccorde a la PSP lol

vu que windows s installe sur psp c facile

[temporario3]

Thanks for pointing this out this, Gintaras. I may conclude the sample rate for the oscilloscope should be limited by the sample rate of the A/D conversor on PSP, then. It would allow a much better sample rate (and maybe even dual oscilloscope channels) if a external A/D converter could be used.

[Gintaras]

I think he uses microphone input to get the signal, its not that hard, I've done the same on my computer. Microphone can get around 40kHz signal.

[temporario3]

@martyfriedman666: I would guess the 'thing on the bench' is some sort of buffer, to avoid connecting psp directly to the signal source (it would be a little harmful to the psp if the signal source had some hundred volts)

How is the psp acquiring the measured signal? What's the interface? Usb? And what about the program, did you write it yourself?

[martyfriedman666]

im interested in doing sometin like this so could you explain whats happening in the vid?

am i right in guessing that the thing on the bench is the oscilloscope and the psp is just displaying it?