Abstract
It is said that the LP sound reproduced by a well-prepared system is superior to the sound of a CD and the difference stems from whether the signal is recorded by analog or digital form. Considering master tape of LP is recorded in digital form, the main difference exists in the bandwidth of the reproduced signal. The signal of a CD is restricted to 20 kHz. On the other hand, the spectrum of an LP signal is extended to 100 kHz. Though the upper limit of hearing acuity of a human is 20 kHz, superior components will contribute to offer more rich and realistic atmosphere. In order to produce a higher-frequency component from CD sound, the folding spectrum of the sampling frequency of 44.1 kHz is utilized. The output signal of a DA converter of a CD player is filtered with BPF of 24–42 kHz. This signal is added to the CD output and presented to listeners. This system is named PULSA (providing ultrasonic atmosphere). A preference test is conducted on conventional CD sound and the sound by PULSA through a wideband static headphone on three minuets of orchestra and opera. It is revealed that PULSA sound is better than the conventional by the ratio of 65 to 35.
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