Sony SCD-555ES Manual De Instrucciones página 19

Characteristics of each digital filter
The contents and characteristics of the five digital filters
are as follows:
STD: Standard (sharp roll-off)
Provides a wide frequency range and spatial feeling, as it
holds the most information among the five filters.
Suitable for playback of classical music.
1: Clear (slow roll-off)
Provides smooth and powerful sound with clear image
position.
Suitable for playback of jazz band performances and jazz
vocals.
2: Plain (slow roll-off)
Provides fresh and energetic sound with rich vocal
expression.
Suitable for playback of vocal performances.
3: Fine (slow roll-off)
Provides well-balanced natural sound, with a large scale
feel and rich reverberation.
Suitable for listening to any kind of music when you are
relaxed.
4: Silky (slow roll-off)
Provides a wide scale feel with associated subtleties.
Suitable for light classical music, especially strings.
What is a variable coefficient (V.C.) digital
filter?
CD players use digital filters to eliminate the noise
generated during sampling. You can change the tone of
your music by changing the cutoff characteristics of the
digital filter.
Sharp roll-off and slow roll-off
Digital filters can be roughly classified into sharp roll-off
types and slow roll-off types, according to their cutoff
characteristics.
(Slow roll-off filter)
Response (dB)
0
-120
0 22.05k
Frequency (Hz)
Comparison of cutoff characteristics for
sharp roll-off filter and slow roll-off filter
Sharp roll-off filters quickly cut off noise over 22.05 kHz
generated during sampling. This is a superior way of
completely reproducing signals below 20 kHz and is the
basic principle behind digital audio.
On the other hand, slow roll-off filters cut off noise
generated during sampling, and are able to hold pre-
ringing and post-ringing (a kind of sound smearing) in
the impulse response signal to a minimum.
Sharp roll-off filter
Post-
Pre-
ringing
ringing
Comparison of impulse response for sharp
roll-off filter and slow roll-off filter
Note
The Digital Filter function primarily changes characteristics
outside the audible frequency. They cannot affect changes within
the audible frequency such as those provided by the tone controls
of the amplifier. Therefore, with certain combinations of
hardware and software, there may be no noticeable effect after
switching the filter.
(Sharp
roll-off filter)
Slow roll-off filter
Pre- Post-
ringing ringing
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