Wow y Flutter

Weno, en una discursion estuvimos hablando q si los platos tenian cierto desajuste y siempre se iban un poco con respecto a un cd.

Yo ya hice pruebas con un Technics, mis Numark TTX y un StageLine de traccion directa. Los resultados fueron de 0,05 segundos de retraso de Technics y Numark y 0,15 de StageLine. El tema era de 5 minutos, con lo cual el desajuste en los 2 primeros es de 0,02%, q creo q entraria dentro del apartado wow & flutter d las especificaciones d los platos (en Numark es d 0,03%, en Technics es 0,025%, medidos en WRMS JIS C5521).

Con todo esto, me gustaria saber si vuestros platos tb notais q se van respecto a cd y si habeis visto cuanta cantidad. Realment despues d esto, creo q es normal, pero kieras q no t deja con la mosca detras d la oreja.

Por cierto, aki pongo lo q me pusieron los d Numark, q basicament es q es normal q se vayan un poco los platos:

Numark escribió:

It's probably due to the wow and flutter that all turntables have. .05
seconds (1/20th of a second) seems like the result you might expect on any turntable.

Salu2 a to2

Hola.He cogido esto de por ahí y lo he puesto akí para saber la definición exacta de wow & flutter (trémolo y fluctuación).
" Technically, wow and flutter are frequency modulations of the original signal. The
frequency deviation defines the intensity of wow and flutter and the modulation frequency defines the frequency of wow and flutter.
To measure wow and flutter, a stable frequency is recorded. The frequency deviation is then measured during play-back. The peak frequency deviation is related to the recorded frequency, and the relationship is given in per cent. The human ear is most sensitive to wow and flutter at frequencies around 3kHz. The test frequency for wow and flutter is standardized by CCIR to 3150Hz. (3000Hz for NAB). To measure wow and flutter, test tapes and test records are available with this special test
frequency.
The human ear recognizes frequency deviations differently, depending on the frequency at which it occurs. We will find a frequency deviation the most annoying if it occurs with a frequency of 4Hz. Higher or lower modulation frequencies are less irritating. Therefore, wow and flutter is weighted with a frequency response which simulates the sensitivity of the human ear for wow and flutter.
The test signal is normally 3150Hz.The value of wow or flutter is determined by the ratio of peak value of the frequency deviation to test frequency."
Resumiendo, que para medirlo se usan discos con señales de test de unos 3,15 khz y se mide la variación sobre esa frecuencia de la salida del plato o cassete.