这里说的高频低频是指时域上采样点分帧后的频率，针对每一帧，作傅利叶变换得到频域的N个分量，这N个分量按照频率为横坐标，振幅为纵坐标。如果没有噪音，这N个分量振幅值应该随着频率增大逐渐递减，但因为噪音存在，在某一高频段处，振幅值出现反常，变得很大，导致信噪比很小，而预加重就是为了把高频段的信号都放大，从而增大高频段的信噪比。

ant Me, is subtitled A Sex Writer’s Journey Into the Heart of Desire

arold Cruse, in his uneven but at turns insightful 1967 polemic, The Crisis of the Negro Intellectual,

D&D’s Drizzt books were built on racist tropes, R.A. Salvatore wants to change that

It happened to be through philosophy books that I found at a bookshop close to my house. The first book I read was Plato’s Republic. Then it was Descartes’s Meditations and a book of lecture notes of Wittgenstein’s called The Blue Book.

Lilith’s Brood, a trilogy first published as Xenogenesis, details the long and seedy seduction of humanity by the Oankali, sluglike aliens that delight in genetic trade with other species. The story is set hundreds of years after the Cold War turns hot and obliterates the superpowers and most of humanity. The Oankali arrive after the war, abduct and resuscitate war-ravaged humans and plan to send us back to Earth — at the cost of merging our biochemistry with theirs.

Spanning continents and centuries, WILD SEED details a tense courtship between two African immortals, one a psychic parasite who can switch bodies, and the other a shapeshifter.

The stories collected in BLOODCHILD move quickly, often laying out their premises and conflicts in a single exchange or sequence.

Dashiell Hammett’s Red Harvest or Raymond Chandler’s The Long Goodbye.

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