PCM vs Bitstream for Samsung TV: Settings Explained

Samsung TVs can show choices such as PCM, Auto, Pass-Through or Dolby Digital in their audio menus. Some models also expose an HDMI input format setting. These are not simple quality rankings. They control how audio enters the TV, how the TV handles it and what signal leaves for a soundbar, receiver or stereo system.

Menu names and available formats vary by model, year, region, firmware, active source and connection. Use this guide as a decision framework, then confirm the exact options in your TV’s e-manual and in the manual for the receiving audio device.

Start by separating input from output

Two similarly named controls can affect different parts of the signal path:

• HDMI Input Audio Format concerns audio arriving at the TV from a connected device such as a console or disc player.
• Digital Output Audio Format concerns audio leaving the TV for a soundbar, AV receiver or another audio product.

Changing an input setting cannot create support that the source, TV or output device lacks. Likewise, an output choice cannot restore channels that were already converted earlier in the chain. To understand the underlying terms first, see PCM Audio Explained and our broader PCM vs Bitstream guide.

HDMI Input Audio Format

On Samsung models that provide this control, it tells the TV what kind of audio to expect from an HDMI source. Select PCM when the connected player or console is already decoding its audio and sending PCM. Select the bitstream-related option only when the source is sending an encoded format that the rest of the signal path supports.

This choice is about compatibility and routing, not an automatic upgrade. A source can send stereo or multichannel PCM, and a bitstream can contain different codecs. The labels alone do not reveal channel count or guarantee that every format will pass through the television. If there is no external HDMI source in the path, the input-format control may have no practical effect on the programme you are hearing.

Digital Output Audio Format

Samsung’s current US support instructions place this control under Settings → All Settings → Sound → Expert Settings → Digital Output Audio Format on supported newer TVs. Older models may use a shorter path or different wording. Options can be unavailable until a compatible source and output connection are active.

PCM

With PCM output, the TV decodes or converts compatible audio before sending it onward. Samsung’s support guidance describes PCM as a useful choice when an audio system has difficulty with higher settings and notes left/right output in that support context. It is therefore a practical first test for TV speakers, a stereo system or a no-sound problem. Do not extend that statement to every HDMI device: PCM as a technology can carry more than two channels, but a particular TV and connection may output only stereo.

Auto

Auto lets the TV select an output according to the programme and connected equipment. It can be a sensible everyday setting when all devices negotiate correctly. It is not proof that the TV has selected the highest-quality format, and it can still be limited by the app, input signal, connection or receiving device.

Pass-Through

Pass-Through is intended to send supported incoming audio onward so the soundbar or receiver can decode it. It is often relevant when a compatible surround system should handle decoding. The option may be unavailable for some built-in apps, inputs or connection states, and successful pass-through depends on support at every stage.

Dolby options

Some models list Dolby Digital or other Dolby choices separately. Use one only when the programme, TV output and receiving device all support it. The appearance of a Dolby label in a menu does not mean that every source will produce that format or that every connection can carry it.

Choose by the connection you actually use

TV speakers or a stereo system

PCM is a sensible starting point when the destination is two-channel or when you need the most broadly compatible output. If a stereo amplifier or DAC receives the signal, check the formats and sample rates accepted by that exact digital input. For product-specific examples, see our Denon Hi-Fi guide and the dCS Elgar Plus DAC review.

Optical audio

Samsung’s support material says optical cannot carry modes beyond 5.1 and presents Dolby Digital as an option for compressed 5.1 output. PCM over a TV’s optical output is commonly two-channel. If you need a format outside the specifications of the optical path, changing the menu label will not overcome that transport limit.

HDMI ARC or eARC

Use the TV port and soundbar or receiver port marked ARC or eARC, then follow both manuals for HDMI control and eARC settings. HDMI can support configurations that optical does not, but the exact result depends on both devices, the source and the content. ARC and eARC should not be treated as interchangeable promises of support.

A practical selection checklist

• Using only TV speakers: start with PCM or Auto and compare stable, correctly synchronised playback.
• Using a stereo amplifier or DAC: start with a PCM format that the input manual confirms.
• Using a compatible soundbar or AV receiver: try Auto or Pass-Through when you want that device to decode supported surround formats.
• Getting silence or intermittent audio: switch temporarily to PCM, then verify the cable, selected input and format support.
• Getting stereo instead of surround: check the source format, TV output mode, connection limits and the receiver’s input display.

Troubleshoot one stage at a time

1. Play known content from the source you actually want to use.
2. Confirm that the TV’s sound output points to the intended speakers or external device.
3. Check the supported formats for the exact input on the soundbar, receiver or DAC.
4. Change one audio setting at a time and inspect the receiving device’s format display where available.
5. If a menu option is missing or greyed out, consult the TV’s model-specific e-manual and current firmware notes.

The best setting is the one that preserves the programme format your complete system supports and works reliably. It is determined by the chain, not by PCM or bitstream as competing badges.

Sources

• Samsung Support: Change the audio format on your Samsung TV
• Samsung Support: Access your Samsung TV’s Settings menu

On Samsung televisions that expose the legacy option, our DTS Neo 2.5 guide explains the stereo-to-surround processing separately from the PCM and bitstream output decision.