I really do wonder at the invention of sound recording and how beneficial it has been for us visually challenged?
In digital era also, I cannot make out as how mere binary language of zeros and ones can reproduce the sound and pictures!!!! -----Original Message----- From: AccessIndia [mailto:accessindia-boun...@accessindia.org.in] On Behalf Of Syed Imran Sent: Wednesday, October 17, 2012 7:53 PM To: jaisonay...@gmail.com; accessindia@accessindia.org.in Subject: Re: [AI] A glympse into the working of a Gramophone So the wind-up gramophone did not need electricity? Did it have a volume control attached to it? -----Original Message----- From: AccessIndia [mailto:accessindia-boun...@accessindia.org.in] On Behalf Of Jaison Bellarmine Sent: 17 October 2012 15:27 To: accessindia@accessindia.org.in Subject: Re: [AI] A glympse into the working of a Gramophone There was one gramaphone at HKCMM School for the Blind Karimpuzha in Kerala which worked with the force of an woun spring. When the spring is tightened the disc will start to revolve on its tray. A stylus which works as the track reader is set in such a way that it moves in the track of the disc. In the tracks, there is hights and low places in an anologue style as per the recorded sound. So the stylus moves back and forth as the disc revolves.the other end of the stylus is attached to a magnet which moves in a solinoid. Since the stylus moves acording to the recorded audio frequency an audio frequency signal is generated in the solinoid. This signal is coupled to a tiny speaker which serves as the driver of a cone loudspeaker. The specially designed cone loudspeaker, through its impedence matching, gives sufficient volume to the audio output. Even in this digital era, this invention is a real miracle. When I saw the gramaphone for the last time, it could play only for one and a half minute because of its weak spring. Experts were not available to repair it. With regards, Jaison Bellarmine-----Original message----- From: Syed Imran Sent: 07/10/2012, 12:31 pm To: accessindia@accessindia.org.in Subject: Re: [AI] A glympse into the working of a Gramophone Sorry folks. Just a correction - The inventor of the gramophone is Emile Berliner <http://en.wikipedia.org/wiki/Emile_Berliner> Thanks From: Syed Imran [mailto:syed.f...@gmail.com] Sent: 07 October 2012 12:02 To: 'accessindia@accessindia.org.in' Subject: A glympse into the working of a Gramophone Hi all A gramophone is An antique record player; the sound of the vibrating needle is amplified acoustically. It is the first machine to reproduce a recorded sound with clarity. Has anyone come across a wind-up gramophone which required no power? If so, please give its physical description. This is invented by none other than one of the greatest inventor Thomas Alva Edison. His other inventions included the incandescent electric light and the microphone and the Kinetoscope (1847-1931). In case you are curious to hear a sample sound of how a gramophone worked those days, here's the link to the Advertising Record of phonographs, recorded by Len Spencer circa 1906. http://upload.wikimedia.org/wikipedia/commons/7/76/Advertising_Record.ogg The recording begins, "I am the Edison phonograph .", and explains the novel benefits of the phonograph from the first person perspective of the machine. A very early landmark of advertising in modern media, this was played widely in shops to entice customers. It is an Ogg Vorbis sound file, length 2m 23s, whose bit rate is 81kbps. Thanks Syed Search for old postings at: http://www.mail-archive.com/accessindia@accessindia.org.in/ To unsubscribe send a message to accessindia-requ...@accessindia.org.in with the subject unsubscribe. 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