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・ UD San Pedro
・ UD San Sebastián de los Reyes
・ UD Santa Mariña
・ UD Santa Marta
・ UD Socuéllamos
・ UD Somozas
・ UD Sousense
・ UD Talavera
・ UD Tegueste
・ UD Tijarafe
・ UD Trucks
・ UD Vall de Uxó
・ UD Vecindario
・ UD Villa de Santa Brígida
・ UD Villa de Santa Brígida B
UD-4
・ Ud-e Molla
・ Ud-e Taqi
・ UD4L Cheyenne
・ Uda
・ Uda (sheep)
・ Uda (surname)
・ Uda Aludeniya
・ Uda Ambala
・ Uda Aparekka
・ Uda Aramba
・ Uda District, Nara
・ Uda Galadebokke
・ Uda Genji
・ UDA Gramenet


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UD-4 : ウィキペディア英語版
UD-4

UD-4, also known as UMX or BMX, was a discrete 4-channel quadraphonic sound system developed by Nippon/Columbia (Denon).
Only 35 to 40 items are encoded in this format, and it was marketed only in the UK, Europe and Japan.
The UMX standard contains two subsystems, BMX, a basic 4-2-4 encoded matrix (different from Regular Matrix), and QMX, a 4-4-4 system.
UD-4 is the process of modulating QMX onto a record with a process similar to CD-4, but also matrix encoded.
The system suffered from incompatibility with regular stereo playback due to phase differences between the left and right channels.
A BMX decoder could be used to play back UD-4 recordings, but, by adding a special cartridge and a UD-4 demodulator, two supplementary channels could be extracted and used to enhance directional resolution.
UD-4 systems first encoded the four original channels into four new channels.
Two of these new channels contained the original four channels, matrix encoded.
The other two contained only band-limited localization information, and were encoded with carriers similar to the CD-4 system.
UD-4 was less critical in its set-up than CD-4, because the carriers did not have to carry frequencies as high as those found in the CD-4 system.
== References ==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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