Thank you for this information.
I have this covered as I can easily do this in Samplitude which has a
built-in deemphasis preset (50/15 µs) in their FFT filter. It also
imparts a 4 dB drop in the signal so there is no risk of any EQ changes
forcing peaks above 0 dBFS (though I doubt this curve would create any,
it is still is prudent considering how close to 0 dBFS many CDs are
I'm wondering how many CDs were recorded with preemphasis?
On 2018-11-09 1:46 PM, Andrew Weaver wrote:
> Hi Richard,
> Had a snafu with my listserv settings, - so my apologies if this is sent
> There are a few command line options for this kind of emphasis as well. The
> program cdda2wav for command line CD ripping detects emphasis and has an
> optional flag for de-emphasizing when ripping. I haven't yet tested this
> yet though, so I can't vouch if it actually works as advertised.
> Additionally, FFmpeg's aemph filter has an option for CD emphasis for
> either applying or de-emphasizing an audio stream.
> https://ffmpeg.org/ffmpeg-filters.html#aemphasis This is another one I have
> been meaning to play with, but haven't actually tested yet.
> WSU Libraries
> On Fri, Nov 9, 2018 at 10:20 AM Richard L. Hess <[log in to unmask]>
>> Thank you! That is great information.
>> On 2018-11-09 11:49 AM, Jos Van Dyck wrote:
>>> I know no CD/DAT/PCM player that will do DSP treatment for de-emphasis
>> before transmitting on a digital IEC 60958 interface.
>> Richard L. Hess email: [log in to unmask]
>> Aurora, Ontario, Canada 647 479 2800
>> Quality tape transfers -- even from hard-to-play tapes.
Richard L. Hess email: [log in to unmask]
Aurora, Ontario, Canada 647 479 2800
Quality tape transfers -- even from hard-to-play tapes.