ATRAC9 (Adaptive Transform Acoustic Coding 9) is a proprietary audio compression technology developed by Sony. It was designed to provide high-quality audio at low bitrates, making it the standard format for sound effects and background music on the PlayStation 4 and PlayStation Vita platforms. Because it is a proprietary Sony format, standard media players like VLC or Windows Media Player cannot play these files natively. The Purpose of at9tool.exe
Before using the tool, it's helpful to understand the format it works with. is Sony's proprietary audio compression codec, used in modern PlayStation hardware (PS4, PS Vita, and PS5). You'll find *.at9 files in many PS4 and PS Vita game dumps.
Place the executable into a dedicated folder (e.g., C:\at9_project ). Place your source .wav file into the same folder. 2. Opening the Command Line Hold Shift and right-click inside your project folder.
: It replaced ATRAC3 and ATRAC3plus, which were standard on the PSP and PS3. at9tool.exe
Looping: Setting specific loop points within an audio file so that background music transitions seamlessly.
Before diving into the tool, it helps to understand why it exists. (Adaptive Transform Acoustic Coding 9) is a proprietary audio compression technology designed by Sony.
The at9tool.exe utility serves as the bridge between standard audio formats and Sony’s proprietary system. It is typically found within the Sony Audio Tool suite or various game development SDKs. Its primary functions include: ATRAC9 (Adaptive Transform Acoustic Coding 9) is a
Technically, *.at9 files have a RIFF WAVE header, but they aren't standard WAV files; they contain ATRAC9 audio data. The at9tool.exe utility is Sony's official encoder and decoder for this format, and it's one of the primary ways to convert audio to and from *.at9 .
at9tool.exe is incredibly picky about its source files. It will not accept random MP3s or non-standard WAV configurations.
: Includes parameters to handle looped audio, which is critical for background music in games. Ease of Use The Purpose of at9tool
Here is detailed information on , a command-line utility associated with ATRAC9 (Adaptive Transform Acoustic Coding 9), an audio codec developed by Sony.
If you want to dive deeper into custom audio implementation, tell me: What are you targeting? (PS Vita, PS4, etc.)
This is the most common complaint among first-time modders. The tool is highly rigid about its inputs.
, which handles the older ATRAC3/ATRAC3plus formats used by the PSP and PS3. Common Use Cases PlayStation Modding: