All-in-one Dual Core Processor - Why a Player with on-board DSP?
Players (portable or not), often have a DSP inside, either simple or sofisticated, but it is a DSP. Zapco has
been inspired by this to offer its customers a professional DSP with the Player inside. What are the
advantagesof our integrated solution compared to that of connecting a Player to the DSP? First, it must
be said that not all portable players have a digital output. If analog, even if it’s of excellent quality, it
would always result in a degradation of quality due to the presence of two more converters on the
signal path. Therefore a coupling of an external player to an analogue input is strongly inadvisable. If,
on the otherhand, the external player has a digital output, then the situation is much better, but still
there is the limit of an SPDIF connection. The SPDIF protocol has a maximum resolution of 24 bits and
a maximum sampling rate of 192 KHz. Another limitation of the SPDIF connection is that the receiver
does not control the speed of data, so it is possible to have connection problems. In any case, the
maximum integration of the two products, DSP and Player inside the same chipset, protects from any
issues of connection whatever the nature of the problem may be.
High-End Solution: 18 independent PCB - Why Modular?
The modularity of the apparatus offers considerable advantages. The first advantage is that the customer
can request the product with the cards that he needs without having to buy what he does not need.
Subsequently it is possible to easily up-grade a part of the product keeping all the rest unaltered. This
allows to keep the value of the product higher over time. The 16-channel HDSP-V is composed of 18
boards and the 8-channel HDSP-V of 15.
96 KHz (16 ch) and 192 KHz (8 ch) - What is the Sampling Rate?
The Sampling Rate represents the capacity of the digital signal to reproduce the analog signal more
faithfully. The higher it is, the better it is, but the difficulty in processing the signal increases proportionally
as well as the power of the processors used. 44 KHz is the sampling rate of a CD disc. The DSPs are
normally at 48 KHz. 96 Khz and 192 KHz are the sampling rates of the most sophisticated DSPs. With
192 KHz sampling rate it is possible to have a 192 KHz digital signal line, starting from the Player up to
the amplifiers.
Very accurate Phase Filter
The HDSP-V has a very accurate All Pass filter for phase adjustment. It is possible to fix the working
frequency of the filter as accurate as 1 Hz and the phase shift also as fine as 1 degree.
VSEQ Filter
This is another innovation of the HDSP-V. Zapco has already introduced this function some time ago in the
analogue ASP-OE8 and ASP-OE2 processors. This allows to restore the response on the low frequencies of
the OEM systems as it is altered by the original manufacturers in order to protect their weak speakers
or other weaknesses when the volume of the radio is increased above a certain level.
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