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Decoding the telephony signals in Pink Floyd's 'The Wall'

417 points| matthiasl | 1 year ago |corelatus.com

131 comments

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cassiepaper|1 year ago

From: James Guthrie interview

> Another piece that worked better than expected was the telephone operator. Roger was keen to illustrate the personal disconnect of being on the road. We were in L.A. at Producer’s Workshop so I phoned my neighbour, Chris Fitzmorris in London. He had the keys to my flat and I asked him to go there and said that I would call him through an operator. “No matter how many times I call”, I said, “just pick up the phone, say ‘Hello’, let the operator speak and then hang up”. I placed a telephone in a soundproof area, got on to an extension phone and started recording to ¼” tape. It took a couple of operators – the first 2 were a bit abrupt, but the 3rd was perfect. I told her that I wanted to make a collect call to Mrs. Floyd. “Who’s calling?” she asked. “Mr. Floyd”, I replied. Chris’s timing was terrific, over and over he would hang up just at the right moment and she became genuinely concerned. “Is there supposed to be someone there besides your wife?” I was playing her along saying things like “No! I don’t know who that is!” “What’s going on?” and she would try the call again. Unwittingly, she was helping to tell the story. Afterwards I went through the ¼” and edited my voice out, just leaving her and Chris. I sometimes wonder if she ever heard herself on the record.

Source: https://www.brain-damage.co.uk/other-related-interviews/jame...

raywu|1 year ago

> Initially, I was shocked at how slowly everything moved! I was used to working really quickly when producing and engineering albums. Suddenly it was like the brakes were on and often it was difficult to get the momentum going. Eventually, I adapted to the Floyd pace. One of the great things about working with this band is that you are allowed time to be creative, to pursue an idea even if it takes some time. The Floyd had a production deal to make their records and the record label never heard anything until it was done. The record was made purely and only by the people in the studio.

The creative freedom without commercial intervention - this is very cool. I can almost hear it in The Wall - how grand and elongated the songs are.

What a great interview. Thank you for linking

mrandish|1 year ago

It's cool to hear how that came together as an improvisation. It recalls a simpler time when a major album (or movie, TV show, etc) could just feature your neighbor and a random telephone operator without signing releases and clearing rights.

It also gave Chris Fitzmorris (the neighbor) one of the greatest "random cool thing that happened to me" stories ever.

SoftTalker|1 year ago

"He keeps hanging up. And it's a man answering."

You can tell the operator was really loving that....

jameslk|1 year ago

I was wondering if they ever figured out who the operator was? I couldn’t find anything about her through my Googling. Seems like she should have some credit in the album for her brilliant contribution

GrumpyNl|1 year ago

This contradicts the finds of the author, this story means it was regular DTMF used while the author could not find that. Or am i missing something?

defaultcompany|1 year ago

On the cassette tape version of The Wall I had if you flipped the cassette over during this phone call sequence it would end up being right in the middle of another song (can't remember which one) which has this recording playing as part of the background. I feel like it couldn't have been intentional but who knows.

hinkley|1 year ago

I’m betting subconscious but intentional. I’ve heard a couple artists talk about how they organize an album and there’s a vibe they’re going for but I didn’t get the impression any of them had it down to anything like a science.

Dark Side of the Moon and the Wizard of Oz. It’s just two artists putting a story arc together by feel and getting the same shape. A bit birthday paradox, but a bit shared vibe.

In the case of The Wall, I would bet a certain degree of symmetry was being reached for. Few artists want to leave or start an album on a sour note, but there will be songs in the middle that are.

One of the things I miss from the pre-streaming era is that “nobody” listens to whole albums at a time anymore, and I find that a shame. I used to start humming the next song on the album when I would hear things on the radio. Makes it worse when they trim the intro or outro for radio play though. I prefer the album version of Wish You Were Here, for instance.

dvh|1 year ago

Alphaville's second album Afternoons in Utopia starts with quiet muffled word "night", then followed by few seconds of silence and then first song called IAO starts. The last song on that album is about Lady Bright:

    There was a young lady named Bright
    Who's speed was much faster, much faster than light
    She departed one day
    In a relative way
    And returned on the previous...

frereubu|1 year ago

It's a nice coincidence but I doubt it was intentional or even subconscious - The Wall was released in 1979, when casette tapes were only just starting to become popular (it was the same year as the first Walkman was released, which contributed hugely to their growth). The vast majority of record sales were vinyl and most bands would be concentrating on that format.

weinzierl|1 year ago

So we know a couple of digits and the splice points. We also know the date. Phone numbers used to be public back then.

It would be fun to grep for the pattern in the matching phone book to see if someone in Pink Floyd's circles comes up.

Only problem is to get hold of a digital version of the phone book. It strikes me as odd how hard it is to retrieve information that used to be so ubiquitous.

Not too long ago police in Germany asked publicly for information about certain phone numbers related to the Madeleine McCann case. Apparently not even the police has an archive of old phone books.

joey_spaztard|1 year ago

This brings back memories of being a clueless script kid in the 1990s.

I knew those tones as CCITT5 tones.

In the days of blueboxing I had a 486 laptop that I acquired because the harddrive died and booted from floppys, a DOS program called 'The Little Operator' that played tones and a photocopy of a book about telephone switching.

matthiasl|1 year ago

You're right; I think CCITT5 is just another name for SS5, because different groups were writing standards. Bell called it one thing, CCITT (an international standards group) called it another thing. And then in the 1990s, the CCITT renamed itself to ITU.

yard2010|1 year ago

I wish there could be a way for me to live through these times. Like world of warcraft classic, but for real life. I know that we're like years away from stuff like these.

codazoda|1 year ago

Young Lust is the song where this operator is heard.

Not being an audiophile, it took me some time to figure out the specific song. My brother had The Wall album, and I enjoyed it, but I never listened to it on my own. I went back and listened to it again for the context.

I really enjoy music but I don't listen to it as often I'd like. I think part of the reason is that I have difficulty concentrating when there is audio in the background. Some of my software engineer co-workers can turn on music or a video while they work, but I'm more productive in silence.

ahmedfromtunis|1 year ago

I have the same issue. When I turn music on, I can't stop focusing on it and losing track of whatever intellectual task I'm on. The only thing I can listen to while writing/reading is white noise or nature sounds type of thing.

Also, having a show play in the background while I do something else like many people love to do? I can't do it.

retrac|1 year ago

> record a real telephone in the US and accurately capture the feeling of a long-distance call

Aside from the signalling, it would be tricky to mimic the tinny hollow sound that came on a long-distance analog connection. Sideband modulation used to reduce the bandwidth, which requires an accurate local oscillator to reconstruct, lest the voice acquire a hint of Donald Duck. Hundreds of channels each separated by a few hundred Hz of gap, all slightly bleeding into each other, the warble of modems and murmur of other speakers making noise that's not exactly white noise in the background, a propagation delay of tens of milliseconds producing an audible electronic echo/ringing, etc. Lots of people at the time would have been familiar with that sound, and it would have been hard to fake.

parpfish|1 year ago

A while back I tracked down the video clip from the show Gomer Pyle that was used for the “But there's somebody else that needs taking care of in Washington” background audio.

Seeing that in its original context was jarring

s0sa|1 year ago

I know what you mean. I recently did the same thing for the little bit from Gunsmoke at the beginning of “Is There Anybody Out There?”, e.g. “Is it unsafe to travel at night?” - incidentally spoken by actress Diana Muldaur, who later played Dr. Pulaski in Star Trek TNG.

peutetre|1 year ago

> The number itself was probably made-up: it's too short and the area code doesn't seem valid.

44 is the country code for the UK.

matthiasl|1 year ago

Author here.

Yep, 44 is the UK country code. The problem I got stuck on is that the rest of the number, 1831, didn't make sense. I assumed the number was complete, since it had the right start and stop signalling (KP1/KF).

It's not long enough to be a London telephone number, and, today, I think London numbers start with 020. The UK numbering plan has changed several times since 1980, but I couldn't find a time between 1980 and now where part of 1831 was a London number.

Later on (in the addendum), it turns out that others took a look at the signal in the time domain and spotted a splice, i.e. digits are chopped out of the middle of the number, so the area code probably isn't there at all. It could be that the area code starts with 1, and then the phone number ends with 831.

Tempat|1 year ago

See the note at the end of the article. It’s a real number but with some of the digits in the middle edited out of the recording.

DidYaWipe|1 year ago

Odd that the author thinks this sequence originated with the movie, when it's present on the album. He says "we know the number is" such and such without saying how.

PaulHoule|1 year ago

Hilarious. As a teen I knew that sequence sounded exactly like MF signaling one would expect on an international call. It was common knowledge of high school hackers that it had recently been straightforward to use a "blue box" to make free calls using that kind of tone but that it was quite difficult by 1985 or so to find places in the network where it would work inside CONUS.

(Phreakers in the late 1980s were frequently "carders" who stole MCI account numbers by methods such as systematic dialing, not to mention my favorite tactic of taking over an answering machine to change the message to "this number accepts all third party and collect calls" which will strike terror into a dentist office or church or other victim when they find out)

rambler17|1 year ago

Soon after the album came out, a morning DJ on one of the FM rock stations in Syracuse NY figured out the number and called it. They had a brief conversation before being hung up on. The DJ would play that conversation from time to time on the air.

willvk|1 year ago

Not sure if it's been mentioned but 1831 on a keypad makes a triangle, or a prism, if you will.

jhoechtl|1 year ago

And what us the number in Knocking on Heavens door, the Guns n'roses version?

matthiasl|1 year ago

659 8890

That one's just ordinary DTMF. I recorded the audio, trimmed it manually and then made a spectrogram like this:

    sox gun1.wav -n rate 4k spectrogram -m -y 500
The 'rate' switch is to cut down on how much of the frequency space we can see. I left the audio as stereo because there's less music power on one channel, making it easier to see the tones.

(And google finds quite a few pages confirming those digits)

buildsjets|1 year ago

659-8890. You just better start sniffin' your own rank subjugation Jack, 'cause it's just you against your tattered libido, the bank, and the mortician, forever man, and it wouldn't be luck if you could get out of life alive.

486sx33|1 year ago

Is there an AI trained on touch tone and other telephony signals? It would be kind of fun to decode historical tones in music and film more easily

zaxomi|1 year ago

There are few well-documented standards. There are ready-made solutions that have worked for decades. What do you think AI would add?

greenavocado|1 year ago

Nice; Now do an analysis of The Telephone Call by Kraftwerk on the album Electric Café

codevark|1 year ago

Odd. This and other PF audio figured in a dream last night. Then I came downstairs and saw this.

tzot|1 year ago

In a parallel universe, this thread is about the Beatles, where you woke up from the dream, found your way downstairs, had a coffee and somebody replied to your post.

prepend|1 year ago

Obviously we are all still in your dream. Please hold on asleep as long as you can as I treasure my existence and don’t want it to end.