The player can decode the soundtrack and then send the audio to the AV receiver as LPCM (also known as PCM).Īll AV receivers will be able to play this back, and it will sound the same as when the AV receiver does the decoding. If your AV receiver doesn’t support the decoding of a particular format on the disc, it may be that your Blu-ray player does. The alternative is that the DVD/Blu-ray player decodes the soundtrack – rather than the AV receiver. Decoding on the Player – Bitstream vs LPCM In most cases, you should set the player to bitstream and let the receiver decode the audio.Īnd, for audio formats like Dolby Atmos, you must bitstream the data to a Dolby Atmos-enabled receiver. Most receivers are set to automatically switch to the default listening mode that matches the incoming codec – although you can change this behavior if you wish. It will decode it and then send the audio to the speakers. Likewise, if a receiver has onboard decoding for Dolby TrueHD audio, it will be able to receive this signal type directly from a Blu-ray player. Then, the front panel display should show ‘DTS 5.1’ (or similar) when it detects the incoming signal. So, if the receiver has a DTS decoder, it will accept a DTS 5.1 soundtrack and play it in 5.1 surround sound. You will find the bitstream option in the audio setup menu of the player.ĭecoders and Post Decoding Formats for The Yamaha RX-V685 AV Receiver The AV receiver will then decode the audio stream and play it through the speakers. If you tell a game console, Blu-ray or DVD player to bitstream the audio, it sends the encoded data to your AV receiver. If you want the AV receiver to decode the soundtrack played from a DVD or Blu-ray player, you will need to set the player’s audio output to ‘bitstream.’ What Is Bitstream? The specifications of the AV receiver will include details of the AV audio decoders that it supports, which will tell you which audio formats it can play. In most cases, the AV receiver usually does the decoding process.Īn AV receiver has built-in decoders to read the data stream sent from your DVD player, Blu-ray player, game console or TV. This is so you will never be in a situation where you cannot hear the sound from a disc you buy – which must be a good thing!įor more detailed information on all these codecs, go to the article on understanding Blu-ray audio codecs. The main soundtrack on a DVD or Blu-ray disc will always be a mandatory audio type that all hardware will support. If your hardware doesn’t support decoding a particular audio format, you won’t be able to play that version of the soundtrack. Very simply, audio decoding is the process of reading the digital data and turning it into audio that you can hear.
The critical thing to understand is that these are the encoded formats, and something needs to decode this audio before you can hear it. But if you look at the back of the box, you will see which soundtracks are available for that disc. You won’t find all these formats on every Blu-ray disc. These aren’t actually codecs – they are object-based data streams added on top of the codecs listed above.
With the new Ultra HD Blu-ray specification, there are two new optional audio formats: For Blu-ray discs, there are seven supported codecs: Once you get this straight, the subject becomes much clearer.Īudio encoding is the method that stores the audio on a DVD or Blu-ray disc. When discussing AV receiver listening modes, you need to be clear about the difference between audio encoding and decoding. However, whatever the term used, all AV receivers will have presets you can use to make the audio work best for your system. Not all AV receiver brands use the term ‘listening mode.’ Here is a list of the terms used by some of the more popular brands:
The main point is that you decide how you want to hear the audio in your room by enabling these listening modes. Or, it may play the soundtrack over a larger speaker layout than initially designed for – or downmix surround sound to stereo. Or, it may enable internal processing, which alters how your system plays the audio.įor example, it may add an effect that makes it sound like you are in a large theater space. It may tell the receiver to play the audio exactly as recorded on the disc.
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Examples of AV Receiver Sound Modes and DSP ProgramsĪ listening mode is simply a preset that tells your AV receiver how to play the audio soundtrack on your DVD or Blu-ray disc.Decoding on the Player – Bitstream vs LPCM.
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