How did those old records play music?
October 42010
I just don’t understand how running the needle over the disk would make it play music.
Sound is all about vibrations which travel through the air as waves. To understand how records are played back, take a moment to think about what happens when sound waves reach your ears…they vibrate a diaphragm called your ear drum.
When the earliest recordings were made, there was a diaphragm which vibrated when sound waves bounced against it….much like an ear drum. These vibrations were transferred to a cutting needle which cut vibrations into the grooves of a record. In this way, an image of actual sound waves was copied into the grooves of the record. Later on, this technology improved to use electronics and microphones, but the result was the same….sound waves cut into the grooves of vinyl.
Playback was simply the reverse process. A needle running through the grooves would bounce and transfer the waves to an amplifying device. In the electric phonographs, the needle was mounted to a cartridge that acted like a microphone. The vibrations were converted to electrical signals and sent through an amplifier and speakers. And what are speakers? Yup, they’re big diaphragms that vibrate to create sound waves.
When I was a kid…back in the dark ages of the 1960’s, somebody had built an ingenious record player for our school library. Instead of electronics, the playback needle was mounted to a stethoscope. The head of the stethoscope was mounted on the turntable’s arm, and connected to tubing with ear pieces.
Actually, when you play back a recording, if you put your ear very close to the needle, you can hear the sound as the needle passes through the grooves. The electronics and diaphragms are simply ways to amplify the sound.
I hope I haven’t made this sound too complicated…it’s really a primitive analog process. Sometimes I think it’s harder to understand how you get music out of CDs….just a bunch of 1’s and 0’s.
“When It’s Love” performed by Van Halen
New Music Tuesday
FREE DOWNLOAD FROM ITUNES – http://itunes.apple.com/gb/podcast/ukf-music-podcast/id371887161
http://www.youtube.com/watch?v=VFsQRT6uULI
Finally got around to uploading this massive release from fantastic Chase & Status, featuring none other then Plan B himself! Available now on their LP More Then Alot on Ram Records. Please support the artist and keep this scene alive, if you like this music, please pay for it Click the below link to buy Ram Record mp3’s https://www.beatport.com/en-US/html/content/label/detail/395/RAM%20Records
Music video by Timbaland performing If We Ever Meet Again. (C) 2010 Mosley Music Group / Blackground Records / Interscope Records
Britt Nicole – The Lost Get Found (Official Music Video)
Perfect…