git subrepo clone https://github.com/libretro/libretro-common.git deps/libretro-common

[pcsx_rearmed.git] / deps / libretro-common / audio / dsp_filters / EQ.dsp

diff --git a/deps/libretro-common/audio/dsp_filters/EQ.dsp b/deps/libretro-common/audio/dsp_filters/EQ.dsp
new file mode 100644 (file)
index 0000000..5a69a68
--- /dev/null
+++ b/deps/libretro-common/audio/dsp_filters/EQ.dsp
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+filters = 1
+filter0 = eq
+
+# Defaults
+
+# Beta factor for Kaiser window.
+# Lower values will allow better frequency resolution, but more ripple.
+# eq_window_beta = 4.0
+
+# The block size on which FFT is done.
+# Too high value requires more processing as well as longer latency but
+# allows finer-grained control over the spectrum.
+# eq_block_size_log2 = 8
+
+# An array of which frequencies to control.
+# You can create an arbitrary amount of these sampling points.
+# The EQ will try to create a frequency response which fits well to these points.
+# The filter response is linearly interpolated between sampling points here.
+#
+# It is implied that 0 Hz (DC) and Nyquist have predefined gains of 0 dB which are interpolated against.
+# If you want a "peak" in the spectrum or similar, you have to define close points to say, 0 dB.
+#
+# E.g.: A boost of 3 dB at 1 kHz can be expressed as.
+# eq_frequencies = "500 1000 2000"
+# eq_gains = "0 3 0"
+# Due to frequency domain smearing, you will not get exactly +3 dB at 1 kHz.
+
+# By default, this filter has a flat frequency response.
+
+# Dumps the impulse response generated by the EQ as a plain-text file
+# with one coefficient per line.
+# eq_impulse_response_output = "eq_impulse.txt"
+#
+# Using GNU Octave or Matlab, you can plot the response with:
+#
+# f = fopen('/path/to/eq_impulse.txt');
+# l = textscan(f, '%f');
+# res = l{1};
+# freqz(res, 1, 4096, 48000);
+#
+# It will give the response in Hz; 48000 is the default Output Rate of RetroArch