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Getting DTS 5.1+ sound via S/PDIF or HDMI using PulseAudio
https://blogs.gentoo.org/mgorny/2021/07/25/getting-dts-5-1-sound-via-s-pdif-or-hdmi-using-pulseaudio/
S/PDIF hardware usually supports MPEG, AC3 and DTS formats. HDMI is better there. HDMI 1.2 technically supports up to 8 channels of PCM audio, 2.0 up to 32 channels. However, not all hardware actually supports that. In particular, my TV seems to only support stereo PCM input, and ignores additional channels when passed 5.1 audio.
Application note - AN5073 - Receiving S/PDIF audio …
https://www.st.com/content/ccc/resource/technical/document/application_note/group0/c5/67/84/35/7e/4c/4c/19/DM00431633/files/DM00431633.pdf/jcr:content/translations/en.DM00431633.pdf
S/PDIF can carry two channels of uncompressed PCM audio, or compressed 5.1/7.1 surround sound (such as DTS audio codec data). However, due to limited bandwidth, it does not support uncompressed audio formats (other than 2-channel LPCM) such as Dolby True HD and DTS master. S/PDIF doesn’t specify any default data transmission rate.
Digital Optical Coax S/PDIF Audio To 5.1 Analog Surround ...
http://www.ambery.com/au-da115.html
Multiple Audio Inputs With 5.1 Surround 2CH Stereo Outputs This audio processor supports total of 4 audio inputs including 2 optical audio inputs, 1 coax S/PDIF input and 1 AUX stereo input in 3.5mm style. It also allows users to select either 5.1 surround output or 2.1 stereo output from the push button on the front panel.
5.1 speakers with SPDIF input? | Tom's Guide Forum
https://forums.tomsguide.com/threads/5-1-speakers-with-spdif-input.382232/
However, it does not have analog outputs for 5.1 audio, hence the need for a system with an SPDIF input. Assuming I cannot find a reasonably inexpensive 5.1 system, I will likely go with the ASUS Xonar DX , as it has the more-common analog outputs and will still drive my headphones better than my onboard sound.
Amazon.com: Digital Optical Coax S/PDIF Audio To 5.1 ...
https://www.amazon.com/Digital-Optical-Analog-Surround-Decoder/dp/B07CVR9R77
No costly hardware upgrade needed. Supports total of 4 audio inputs including 2 optical audio inputs, 1 coax S/PDIF input and 1 AUX stereo input in 3.5mm style. Featured with 24-bit audio DSP and 96 KHz digital receiver for sampling rate up to 192 KHz. Multi-channel digital optical or coax S/PDIF audio in AC-3, DD, DTS, LPCM or PCM format can be decoded into 5.1 analog surround …
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