Saving Photos To . . . A Voice Recorder?

Technology:

Slow Scan Television
Long-Term Predicted Excitation Coding

Devices:

Sony M-470 Microcassette recorder
Sony ICD-SX40 Digital voice recorder
Sony ICD-LX30 Digital voice recorder
Samsung Galaxy Note 7
Curta Type II

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Quotes:

“Muddy water is best cleared by leaving it alone" - Alan Watts

"You can observe a lot by just watching" - Yogi Berra

“I have lived with several Zen masters -- all of them cats” - Eckhart Tolle

“One is never afraid of the unknown; one is afraid of the known coming to an end” ― Jiddu Krishnamurti

Music:

Dreamstate Logic - Cosmic Legacy ( album preview ) [ space ambient ]

Videos:

Primer (2004)

@RedLetterMedia
Red Letter Media Investigates: The Paranormal Investigation

Red Letter Media Investigates: The Villisca Ax Murder House

Twin Peaks Season 1 Episode 1 - Northwest Passage
Northern Exposure Season 4 Episode 1 - Northwest Passages

[JPkerVideo]

Using Curta to calculate is a big flex especially if one has fixed it... put a big smile on my face this one!

[ozzelot]

Once again, I grabbed two random Android phones and started making them yell pictures at each other for no reason than the enjoyment of it.

[paolo_oloap]

SSTV was used in Portal by Valve as part of a new achievement/hidden ARG. When you brought the seemingly randomly placed radios to certain areas they played an audio tone that you could feed into an SSTV decoder to generate images relevant to the ARG.

[miasma]

This is why i love youtube. It's the only place where you can find interesting things like this

[anki.]

Respect for using a freaking Galaxy Note 7 😂

[HonestAuntyElle]

Loved the unexpected Curta Calculator Cameo

[danielktdoranie]

The mid 00s Sony digital handheld recorder brings back memories. I used to bring one to my lectures and record them with a directional microphone pointed at the professor speaking. Each class got its own memory card. I would upload them to my iBook G4 and make them into 128kb MP3s (more than good for just public speaking recordings) and organise those into playlists, I would listen to those playlists constantly on my iPod and in my car (using this cassette tape looking adapter that gave me a AUX line in).

I got my undergraduate degree by memorisation 😂

[AROAH]

I love the casual use of a portable mechanical calculator as if that’s a totally normal thing to use

[TheScarface]

"I wanna put this into my 'Top 10 test modes of all time' list."
This channel is truly one of a kind. Never change. 👍

[Metazolid]

I'm getting Posy vibes from this video, I like it.

[DarkFiber]

Slow Scan TV is super popular on ham radio. People send photos all over the world from their house radio stations or even in the park, with a wire tossed up in the tree and the radio operating off of battery power. 73 de WU2F

[thisislilraskal]

Here to officially request the _"Janus_ _Cycle_ _best_ _of_ _test_ _mode_ _sounds_ _list"_ please.

[hobbified]

Yeah, something that most people don't understand is that compression is all about probabilities. Every compression algorithm has, implicitly or explicitly, a *prior expectation* about what its input should look like. Inputs that match that expectation well compress well. Inputs that don't match that expectation compress poorly (for a lossless algorithm, they take a lot more bits; for a lossy algorithm, they get reproduced poorly).

So if you develop an algorithm that has a very high compression ratio and is very highly optimized for speech, that means it "wants to hear speech" no matter what. Give it music, and you get a garbly mess that sounds kind of like a room full of people having a million conversations. Give it random noise, and you get something that sounds *more like speech* than an uncompressed recording would. It will sound like whispers, or ghosts, especially if that's what you want to hear.

Although that Sony codec is proprietary and undocumented (which is typical Sony), being LPC makes it a cousin of many codecs that have been used in cell phones (original GSM), VoIP apps, and older streaming formats like RealAudio.

I suspect the reason LPC makes such a hash of SSTV is that it has decent frequency reproduction, but it's subject to "temporal smearing" — which not only blurs the image horizontally, it also makes the sync pulse hard to localize (like the tape flutter only 10x worse), which means that successive lines hardly ever align with each other.

[Mmr_human]

I just found your channel, and I consider it a treasure. It deserves millions of views. A big thank you from Morocco!

[werewolf]

I mean its basically a modem. There was a virus back in the day where a computer, with the virus, would transmit a sound over speakers, and any computer with a microphone could hear it and get the virus. Like an airborne computer virus. I am fascinated with the idea that these speakers can produce and microphones can hear outside the range of humans. So you could give, for example, Alexa commands that humans can not hear.

[Nomad_Audio]

Youtube has been recommending this video to me for a week now and I finally watched it. Hands down one of my favorite videos on here...love what you're doing man! Something that came to my mind while watching - I think the sample rate (not necessarily just the bit rate) of the audio might have a lot to do with how accurately the audio is captured and then reproduced. The sample rate of the older digital recorder is very low, so it's not capturing the full picture. The newer recorder is capturing at 44.1khz, so it manages to get a much more accurate sample of the image.

This is such a fascinating topic!

[korasov]

Surprisingly good results for mp3 codec.

[SteveHartmanVideos]

This explains why audiophiles love "lossless" music files. You can really see what is lost with this experiment! But also, how good mp3 128 looked. So some lossy codecs maybe "Good enough" for good sound quality. .Wav or .Flac (lossless) would give the best results. Super interesting. Great video.

[quarteratom]

Small button-operated battery-driven segmented-LCD devices are so cool. They are designed to do one thing well. Segmented-LCD is so energy-efficient.

[appthe]

When I saw that thumbnail I thought you're going on a journey into that weird time in the voice recorder industry when everyone tried to push features into them super hard. As a result I used to have a voice recorder from Olympus in 2004 which did indeed have a camera and take pictures! You couldn't listen or view them but you could drop them onto your PC after the fact