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/linux-4.1.27/Documentation/sound/alsa/
DAudigy-mixer.txt33 LFE - low frequency effects (subwoofer signal)
60 name='PCM LFE Playback Volume',index=0
62 This control is used to attenuate sample for LFE PCM FX-bus accumulator.
63 ALSA uses accumulator 7 for LFE PCM sample for 5.1 playback. The result sample
64 is forwarded to the LFE DAC PCM slot of the Philips DAC.
169 All stereo signals are mixed together and mirrored to surround, center and LFE.
175 All stereo signals are mixed together and mirrored to surround, center and LFE.
181 All stereo signals are mixed together and mirrored to surround, center and LFE.
184 name='LFE Playback Volume',index=0
186 All stereo signals are mixed together and mirrored to surround, center and LFE.
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Demu10k1-jack.txt45 the second and third input ports are wired to the center/LFE output. You will
60 ~capture_5 LFE EXTOUT(0x12) // mapped to by LFE
DHD-Audio-Controls.txt40 * Swap Center/LFE
41 Swaps the center and LFE channel order. Normally, the left
42 corresponds to the center and the right to the LFE. When this is
43 ON, the left to the LFE and the right to the center.
DControlNames.txt23 LFE
37 Bass Speaker (internal LFE speaker)
DSB-Live-mixer.txt47 LFE - low frequency effects (subwoofer signal)
75 name='Wave LFE Playback Volume',index=0
125 name='LFE Playback Volume',index=0
216 and center / LFE outputs are affected.
243 left headphone output (useful for SB Live cards without separate center/LFE
246 name='Headphone LFE Playback Switch',index=1
249 right headphone output (useful for SB Live cards without separate center/LFE
DChannel-Mapping-API.txt22 from rear. Or, some devices secretly assume that center/LFE is the
23 third/fourth channels while others that C/LFE as 5th/6th channels.
88 SNDRV_CHMAP_LFE, /* LFE */
DCMIPCI.txt99 jack. Either "Mic-In" or "Center/LFE Output" can be
101 When "Center/LFE Output" is chosen, the center and bass
/linux-4.1.27/sound/pci/hda/
Dpatch_hdmi.c208 LFE = (1 << 10), /* Low Frequency Effect */ enumerator
222 [1] = LFE,
290 { .ca_index = 0x01, .speakers = { 0, 0, 0, 0, 0, LFE, FR, FL } },
296 { .ca_index = 0x09, .speakers = { 0, 0, RR, RL, 0, LFE, FR, FL } },
300 { .ca_index = 0x0b, .speakers = { 0, 0, RR, RL, FC, LFE, FR, FL } },
302 { .ca_index = 0x0f, .speakers = { 0, RC, RR, RL, FC, LFE, FR, FL } },
304 { .ca_index = 0x13, .speakers = { RRC, RLC, RR, RL, FC, LFE, FR, FL } },
306 { .ca_index = 0x03, .speakers = { 0, 0, 0, 0, FC, LFE, FR, FL } },
308 { .ca_index = 0x05, .speakers = { 0, 0, 0, RC, 0, LFE, FR, FL } },
310 { .ca_index = 0x07, .speakers = { 0, 0, 0, RC, FC, LFE, FR, FL } },
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