Bedienungsanleitung Yamaha PSR-A1000 (Seite 140 von 156) (Englisch)

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Using Your PSR-A1000 with Other Devices

PSR-A1000

140

Now let’s examine what happens when we play back a

recording. When you playback a music CD (for example,

a solo piano recording), you’re hearing the actual sound

(vibrations in air) of the acoustic instrument. This is called

audio data, to distinguish it from MIDI data.

In the above example, the actual acoustic sounds of the

pianist’s performance are captured in the recording as

audio data, and this is recorded to CD. When you play

back that CD on your audio system, you can hear the

actual piano performance. The piano itself is not

necessary, since the recording contains the actual sounds

of the piano, and your speakers reproduce them.

The “controller” and “tone generator” in the illustration

above are equivalent to the piano in our acoustic

example. Here, the player’s performance on the keyboard

is captured as MIDI song data (see illustration below). In

order to record the audio performance on an acoustic

piano, special recording equipment is needed. However,

since the PSR-A1000 features a built-in sequencer that

lets you record performance data, this recording

equipment is unnecessary. Instead, your digital instrument

— the PSR-A1000 — allows you to both record and play

back the data.

However, we also need a sound source to produce the

audio, which eventually comes from your speakers. The

tone generator of the PSR-A1000 ﬁlls this function. The

recorded performance is reproduced by the sequencer,

playing back the song data, using a tone generator

capable of accurately producing various instrument

sounds — including that of a piano. Looked at in another

way, the relation of the sequencer and the tone generator

is similar to that of the pianist and the piano — one plays

the other. Since digital instruments handle playback data

and the actual sounds independently, we can hear our

piano performance played by another instrument, such as

guitar or violin.

Finally, we’ll take a look at the actual data that gets

recorded and that serves as the basis for playing the

sounds. For example, let’s say you play a “C” quarter note

using the grand piano sound on the PSR-A1000 keyboard.

Unlike an acoustic instrument that puts out a resonated

note, the electronic instrument puts out information from

the keyboard such as “with what voice,” “with which

key,” “about how strong,” “when was it pressed” and

“when was it released.” Then each piece of information is

changed into a number value and sent to the tone

generator. Using these numbers as a basis, the tone

generator plays the stored sampled note.

Recording and playing back the performance of an acoustic

instrument (audio data)

Recording Playback

Tone generator

Sequencer

Recording and playing back the performance of a digital

instrument (MIDI data)

Controller (keyboard, etc.)

Recording Playback

In the case of digital instruments, the audio signals are sent

through output jacks (such as AUX OUT) on the instrument.

Tone generator

Sequencer

Keyboard performance

(MIDI data)

Even though it is a single musical instrument, the PSR-A1000 can

be thought of as containing several electronic components: a con-

troller, a tone generator, and a sequencer.

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