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新布局对关键部件进行了彻底的改造和重新定位，取得了显着的改进。有些改进是不可见的，但有助于提高性能；其中包括： - 通道间串扰更低。 - 大量的布局改进，实现了一些显着的改进。 - 更好的 CMRR 保证了完美的信号对称性。 - 去加重曲线的奇异精度。
http://audioniuli.com/wp-content/uploads/dat_2223.pdf
The new layout with complete remodelling and repositioning of critical parts achieves noticeable improvements.Some ameliorations are not visible, but help performance; amongst them are: - an even lower interchannel crosstalk. - a multitude of layout refinements that achieve some noticeable improvements.- even better CMRR guarantees perfect signal symmetry.- singular accuracy of de-emphasis curves.
http://audioniuli.com/wp-content/uploads/dat_2223.pdf
真正平衡的唱头接口 根据设计，所有唱头唱头都是平衡源。术语“平衡”描述了一种系统，其中音频信号通过两个屏蔽对称导体进行传输，两个导体均不接地（见图 1）。 （有关平衡的一般信息，请参阅第 34 号技术公告）。直到今天，唱头的互连仍然是“不平衡的”。不平衡系统是一种信号路径由屏蔽层承载或以某种方式将信号暴露给接地载体的系统。因此，诸如嗡嗡声、射频、噪声等干扰信号会被屏蔽层拾取，从而进入音频电路。信号电平越低和/或存在的环境干扰越多，不平衡（单端）接口导致性能下降的危险就越大。当人们考虑到唱头的极低信号水平时，很明显，前置放大器的真正平衡信号接口比目前可用的设计是一个巨大的改进。不幸的是，这样一个优雅的系统总是面临着许多技术问题。在 FM 222 中，这些限制已被完全克服
TRUE BALANCED CARTRIDGE
INTERFACE
By design all phono cartridges are balanced sources.
The term "balanced" describes a system in which the
audio signal is transferred via two shielded symmetrical conductors, neither of which is connected to
ground (see Fig. 1).
(For general information on balancing consult Technical Bulletin No. 34).
To this day the interconnection of phono cartridges
has been done "unbalanced". An unbalanced system
is one in which one of the signal paths is carried by the
shield or in some way is exposing the signal to the
ground carrier. Because of this, interference signals
such as hum, RF, noise etc. are picked up by the
shield and can thereby enter the audio circuitry.
The lower the signal level and/or the more ambient
interference present, the greater is the danger of
degradation allowed by an unbalanced (single ended)
interface.
When one considers the extremely-low signal levels of
cartridges, it becomes clear that a true balanced
signal interface to the preamplifier is a huge improvement over presently available designs. Unfortunately,
such an elegant system was always faced with a
number of technical problems. In the FM 222 these
limitations have been overcome entirely.
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发表于 2023-8-27 11:22
