Using The Display - Sony CDP-XA50ES Mode D'emploi

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Mode d'emploi (113 pages)

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Table des Matières

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Playing CDs

3: Analog type

This is a slow roll-off, direct type filter that simulates a

seventh-order analog Butterworth filter. This filter

completely prevents pre-ringing in the impulse

response. Also, since it simulates an analog filter, the

high-region phase outside the audible frequency is

rotated. The filters from 3A to 3C differ in degree of

phase rotation. 3A is multiplied by one (the true analog

characteristic), 3b is multiplied by 0.75, and 3C is

multiplied by 0.5. The impulse response changes as

shown in the figures below. The degree of pre-ringing

and post-ringing varies with the degree of phase

change. This gives the sound a feeling of warmth and

depth.

Comparison of filter 3 impulse response

4: Butterworth

This is a slow roll-off, direct type filter and includes

fifth-order through ninth-order Butterworth filters.

However, the phase is linear and does not include the

phase change possibilities of filter 3 (analog type). As

the figure below shows, only the cutoff characteristics

can be changed in the fifth-order (4A), the seventh-

order (4b) and the ninth-order (4C). Ringing in the

impulse response increases from the fifth-order filter to

the ninth-order filter. This filter gives the sound a

feeling of balance and comfort.

Response

(dB)

Comparison of filter 4 cutoff characteristics

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.

20k

Frequency (Hz)