OGG vs MP3

[mad_arab]

Nå begynner MP3-formatet virkelig å dra på åra, så det er mærklig det ikke har kommet noe som er veldig mye bedre enn det. MP3 (MPEG 1 Layer 3) ble faktisk brukt til kringkasting over ISDN-linjer under Alberville OL i '92. Noe jeg har merket meg er den enorme forskellen i MP3-filer med samme bitrate, noen av kodekene er jo helt ubruklige!

 

Mp3 ble ikke brukt den gangen, det du snakker om er MPEG1 Layer2, som har vært i bruk i lengre tid. Derfor er det også endel av f.eks VCD standarden, men MPEG1 Layer3 er endel nyere ('96 hvis jeg husker riktig).

[Kamerat]

Ikke det nei...

Music Links via ISDN

 

Digital telephone networks (ISDN = Integrated Services Digital Network) offer reliable dial-up links with two 64 kbps data channels per basic rate adapter; other regional networks (in North-America) use 56 kbps data links. Transmission fees are often rather similar or identical to the traditional analog phone lines - those allow to transmit up to 28.8 kbps (V.34 modem) or even 32 kbps ("V.34+").

 

Using Layer-3, a low-cost narrowband ISDN connection allows to transmit CD-quality sound. Audio professionals, like broadcasting stations and sound studios, benefit from the "music-by-phone" application in various ways. They save money, as they only pay transmission fees for the actual time of usage (not 24 h a day in case of a leased phone line) and for a rather small data channel (one ISDN phone connector for a stereo music link). Radio stations increase the attractiveness of their programs, as reporters transmit high-quality takes (e.g. an interview) or live news without annoying "telephone sound". And new applications become possible, e.g. a "virtual studio", where remote artists may play along some preproduced material, without actually travelling to the studio.

 

Examples:

• In 1992, Radio FFN, a private broadcasting station in Niedersachsen, Germany, replaced its leased phone lines with ISDN and Layer-3 codecs, to transmit 8 local programs 20 min per day to the central broadcasting studio. This move saved them transmission fees of more than 300.000 US$ per year.

[*]As one of the first real-world trials, all private radio stations of Germany very successfully used Layer-3 codecs during the Winter Olympic Games in Albertville (France) as reporter links between the various sporting events and their central studio in Meribel.

[*]At the International Music Festival 92 in Bergen, Arne Nordheim composed a piece of music, where an organ in the church of Trondheim played along with the symphony orchestra in Bergen; the sound of the organ was transmitted via ISDN and a Layer- 3 codec.

Since 1992, various manufacturers are providing equipment ("codecs") for professional audio applications: AVT, Broadcast Electronics, CCS, Dialog 4, Telos.

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