Akai S950 Manual do Operador descarregar pdf (Página 97)

FIG. 2. Digitising an analogue waveform with a low sampling rate

But this needn't concern you too much because you can rest safe in the

knowledge that the 5950's sampling rate is up there with the big boys

sampling away at 48kHz giving you a maximum bandwidth of 19.2kHz - it's only

when you want to sample longer sounds that you may have to compromise on

audio quality by bringing the sampling rate down and hence the bandwidth.

Even when you do this, you'll be surprised how good the 5950 sounds even

with a bandwidth as low as lOkHz. Also, the sampling rate (and hence

bandwidth) on the 5950 is continuously and totally variable and this allows

you to maximise the sample memory. For example, say you were sampling a drum

kit. The cracky snare would need a bandwidth of around 16kHz as would the

hi-hats whilst the cymbals may require an even ,higher bandwidth - maybe

18-19kHz. The kick or bass drum, on the other hand, could get away wits a

bandwidth of around IOkHz whilst the toms could still sound good.at a

bandwidth of 12-i4kHz. In this way, you can sample sounds. with the optimum

bandwidth and make more economical use of the 5950's sample memory.

So, once you taken this series of digital snapshots of the sound, what then?

Well, each step of the digitised waveform is given a number so-that the

computer can understand what it's dealing with and held in RANDOM ACCESS

MEMORY or RAM. The more bits your sampler has, the more numbers the computer

can assign to these steps and with more numbers, you can take more snapshots

and so increase dynamic range, audio quality and/or sampling time even

further.

The trouble is, those numbers mean nothing to us so they have to pass

through a thing known as a DIGITAL TO ANALOGUE CONVERTER or DAC and here the

digital sound is reconstituted into a continuous signal again and we hear

the resulting sound. Fig. 3 shows a simplified layout of the 5950.

FIG. 3. Simplified layout of 5950

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 105 106

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Akai S950 Manual do Operador Página 97