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872875b5403af8ccf234a0d8d39ec353e434f68c
Since the PDM mic has dc signal, the signal will be recorded as 0 when gain is too large. The dc and voice signals will be enlarge to maximum value and they will be filtered to zero by high pass filter. Change-Id: I4973da38a28028dff502e3bc7f97030a3bde7b8f Signed-off-by: Jason Zhu <jason.zhu@rock-chips.com>
Merge tag 'mm-hotfixes-stable-2022-12-10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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