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There is an answer in Statisticals spectral analysis - A non-probabilistic theory (W.A. Gardner 1987)

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There is an answer in Statisticals spectral analysis - A non-probabilistic theory (W.A. Gardner 1987)

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This idea is illustrated with the following example. Consider the problem of determining the resonance frequency and damping ratio of a single-degree-of- freedom mechanical system (see exercise 10) that is subject to a continuous random vibrational force excitation x. The system displacement response y can be modeled as an LTI transformation of the excitation, with the transfer function magnitude |H| shown in Figure 3-1, which reveals the resonance frequency f0 

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How to program a plasma globe effect: Try to write an X/Y signals plotter but mess up some of the parameters, like carrier offset and zoom.

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How to program a plasma globe effect: Try to write an X/Y signals plotter but mess up some of the parameters, like carrier offset and zoom.

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A bunch of pink, pixelated lines emanating from the center of the image in a chaotic manner

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@Viss I'm interested?!

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@Viss I'm interested?!

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Bibi-binary is a hexadecimal notation system from 1968 with its own binary-derived symbols and single-syllable pronunciations for each digit https://en.wikipedia.org/wiki/Bibi-bin ary

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Bibi-binary is a hexadecimal notation system from 1968 with its own binary-derived symbols and single-syllable pronunciations for each digit https://en.wikipedia.org/wiki/Bibi-bin ary

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@destevez Happy to see it put on display!

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@destevez Happy to see it put on display!

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@dg3hda @ShadowJonathan Looks familiar xD

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@dg3hda @ShadowJonathan Looks familiar xD

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@exyn Interesting! Sounds like working life alright... :) Sorry you couldn't enjoy the full benefits but thanks for the fun puzzle!

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@exyn Interesting! Sounds like working life alright... :) Sorry you couldn't enjoy the full benefits but thanks for the fun puzzle!

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https://www. youtube.com/watch?v=njw2oB8oRT s

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https://www. youtube.com/watch?v=njw2oB8oRT s

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There are even papers written about Elvis's slapback echo:

Halmrast. T, (2019). Sam Phillips ́ Slap Back Echo; Luckily in Mono. In Proceedings of the 12th Art of Record Production Conference Mono: Stereo: Multi

https://www. diva-portal.org/smash/get/diva 2:1320422/FULLTEXT01.pdf

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There are even papers written about Elvis's slapback echo:

Halmrast. T, (2019). Sam Phillips ́ Slap Back Echo; Luckily in Mono. In Proceedings of the 12th Art of Record Production Conference Mono: Stereo: Multi

https://www. diva-portal.org/smash/get/diva 2:1320422/FULLTEXT01.pdf

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Echo seen in a cepstrum plot.

Elvis Presley's 1955 Mystery Train uses the slapback echo effect. A deep dive into the cepstrum reveals he is using two echos at slightly different speeds on the same track, 146ms for the guitar and 135ms for the vocals :)

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Echo seen in a cepstrum plot.

Elvis Presley's 1955 Mystery Train uses the slapback echo effect. A deep dive into the cepstrum reveals he is using two echos at slightly different speeds on the same track, 146ms for the guitar and 135ms for the vocals :)

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A spectrogram covering roughly 20 seconds of audio, but the x axis shows milliseconds instead of frequencies. A bright blob labeled 'guitar intro' at 146 ms  can be seen in the beginning of the song, followed by a bright blob near 135 ms labeled 'vocals'.

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This past summer, v1.0.0 of redsea the RDS decoder was released. It's a big update that is mostly about ensuring long-term maintainability. But we have some new features as well:

* Enhanced RadioText (eRT) support
* Long PS name support
* Better noise resistance
* Option to reject instead of correct bit errors

https://github.com/windytan/redsea/rel eases

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This past summer, v1.0.0 of redsea the RDS decoder was released. It's a big update that is mostly about ensuring long-term maintainability. But we have some new features as well:

* Enhanced RadioText (eRT) support
* Long PS name support
* Better noise resistance
* Option to reject instead of correct bit errors

https://github.com/windytan/redsea/rel eases

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@rajelaran @jpm @mos_8502 Reliability of readout was a big issue, IIRC :)

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@rajelaran @jpm @mos_8502 Reliability of readout was a big issue, IIRC :)

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@hdm Thanks! I'll check them out for sure. Happy to see archive.org hosting zines like this.

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@hdm Thanks! I'll check them out for sure. Happy to see archive.org hosting zines like this.

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@Viss Thanks!!

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@Viss Thanks!!

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@eythian I used a couple different Zoom recorders to capture the sound - the pictures are from home-made software

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@eythian I used a couple different Zoom recorders to capture the sound - the pictures are from home-made software

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New blog post: Ultrasonic investigations in shopping centres

Many PA systems emit a continuous high-frequency tone for troubleshooting purposes. It gets modulated in interesting ways by the urban bustle.

https://www. windytan.com/2024/06/ultrasoni c-investigations-in-shopping.html

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New blog post: Ultrasonic investigations in shopping centres

Many PA systems emit a continuous high-frequency tone for troubleshooting purposes. It gets modulated in interesting ways by the urban bustle.

https://www. windytan.com/2024/06/ultrasoni c-investigations-in-shopping.html

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@paulvg What a resource, thank you!

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@paulvg What a resource, thank you!

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My bookcase is 10% empty. Have you encountered any good books, old or new, about oldskool phone phreaking or things of that nature?

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My bookcase is 10% empty. Have you encountered any good books, old or new, about oldskool phone phreaking or things of that nature?

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@th Magnificent views.

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@th Magnificent views.