Modern Xiaomi and Redmi Note smartphones are equipped with high-quality microphones, making them the perfect tool for recording lectures, interviews or personal notes. However, it often happens that at the beginning or end of an important conversation there are extra seconds of silence, extraneous noises or unnecessary comments that need to be removed. The built-in Dictophone app in the shell of MIUI and the new HyperOS has hidden functionality that allows you to quickly edit audio files without installing third-party software.
Many users mistakenly believe that for high-quality audio editing, you must download heavy editors from Google Play. This is not always the case, because the system solution from Xiaomi provides a basic but effective set of tools for working with the Internet. WAV-Cutting down is one of the key features that is available out of the box, but the interface often hides it in the optional menus, making it unobvious to beginners.
In this guide, we will take a closer look at the editing process, look at the nuances of working with files in different formats, and answer frequent questions. You will learn not only to delete unnecessary fragments, but also to save originals, so that you do not lose important data in the event of an error. Let's move to the practical part and figure out how to turn raw audio capture into a clean and structured file right on your device.
Preparation for editing and search for files
Before you start manipulating the audio track, you need to find the file itself in the system. The standard Dictaphone app stores the records in its own database, but access them through the List or All Records tab. If you used a third-party recording application, the file may be in the File Manager folder in the Audio or Recorder section.
To get started, run the system app Recording Sound (or Recorder), and on the home screen you'll see a list of all available tracks, sorted by date of creation. Importantly, if you don't see the record you want, check if it's hidden in the archive or in the Favorites folder, where some users accidentally transfer files.
Click on a particular record to open it in playback mode. This is where the basic controls are hidden in the player window. The interface may vary depending on the MIUI version, but the logic remains the same for all Redmi Note and Poco models.
⚠️ Note: Before you start any action with files, make sure that the device has enough free memory.When you save the edited version, the system often creates a copy rather than rewrite the original, which can double the space occupied.
Make sure the file is not edit-proof. Some system records or files synced to the Xiaomi Cloud may require pre-loading or permission confirmation. If the edit button is inactive, try copying the file to another folder through Explorer.
Step-by-step instruction for audio cropping
The process of removing unnecessary fragments in the standard Xiaomi application is implemented quite intuitively, although it requires care. After opening the desired record, pay attention to the bottom of the screen or the menu of three points where additional options are usually located.
Click on the More button (often marked with a tripod) and select Edit or Trip, and a visual editor will open, where the sound wave will be represented as a graph, and this is the graph you will work with to highlight the desired area.
☑️ Ready for pruning
To highlight the fragment, use two sliders (markers) located on the edges of the selected area. Move the left marker to the right to cut off the beginning, and the right to the left to remove the end. The accuracy of the selection can be adjusted by zooming in with your fingers (plugs), if this feature is supported in your version of the software.
Once the area is selected, listen to the result by pressing the play button. Make sure the important words are not cropped and the pauses are deleted correctly. If that's correct, click Save. The system will offer two options: save as a new file or replace the current one.
| Action. | Description | The result |
|---|---|---|
| Move the left marker | Shifting the beginning of the allocated area | Removal of the start of recording to the marker |
| Movement of the right marker | Shifting the end of the allocated area | Removal of the end of the record after the marker |
| Save button | Finalization of changes | Creating a file or replacing the original |
| Cancel button | Unchanged exit | Maintaining the original version |
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Always choose the option “Save as a copy” or “Save as a new file” to ensure that the original record stays intact if you accidentally trim the extra or make a computational error.
Multiple fragments and accuracy
Xiaomi’s standard editor allows you to work with only one continuous snippet at a time, which means that if you need to cut the middle of a record, leaving the beginning and the end, you will have to act more cleverly or use the method of sequential saving.
To remove the middle, first select and save the first part (beginning). Then go back to the original, select the second part (end) and save it separately, and then you can combine files, if this feature is available, or use a third-party splicer.
The accuracy of the trimming depends on the scale (waveform). On small screens of Redmi Note smartphones, it is difficult to isolate a fragment lasting a fraction of a second. Maximum accuracy is achieved when zooming the editing area with a double tap or pinch, if the interface allows scaling.
- 🎧 Use headphones to listen to – this will help you hear small artifacts of pruning.
- 📱 Turn the device horizontally – in landscape mode, the timeline often becomes wider and more convenient.
- 💾 Make Intermediate Savings – If editing is difficult, save the steps as new files.
⚠️ Note: When cutting very short fragments (less than one). 0.5 The audio compression algorithm can add artifacts or clicks at the beginning and end of the file. 0.1-0.2 seconds.
If the built-in tools fail to achieve the desired accuracy, it makes sense to consider installing specialized applications from Google Play, such as Lexis Audio Editor or MP3 Cutter.
File formats and compatibility
Xiaomi smartphones by default record sound in AMR or AAC format, which provide good quality with a small file size. However, when editing and saving, the system can convert the file to WAV or leave in the original format, which affects compatibility with other devices.
The WAV format is uncompressed, so it takes up significantly more space on the drive. If you cut a long lecture, the final file can inflate in size several times larger than the original.
What is the difference between AMR and WAV?
When exporting a record to other applications (e.g. messengers or video editors), pay attention to file extensions. Some video editors may not “see” the AMR format, requiring conversion. In such cases, saving the edited version as WAV or MP3 (if the editor supports) will solve the problem.
You can check the file format through the File Manager. Click on the file, select Properties or Details, and the "Type" bar will specify the exact extension, which will help you understand why the file may not open on your computer or other smartphone.
Noise removal and quality improvement
Newer versions of HyperOS and MIUI 14 have a noise reduction feature that works both in recording and processing, and if your recording contains a background hum, it's worth trying this filter.
In editing mode, find the Noise Reduction button (a speaker icon with waves). The algorithm will analyze the audio stream and try to reduce the level of persistent noise, such as fan hum or street noise.
- 🔇 Don’t overdo it with the power of noise cancellation – it can make your voice “robotic».
- 🗣️ The feature works best with speech, but can distort music.
- ⏱️ Processing can take time depending on track length and Redmi processor power.
It's worth noting that software-based noise removal is always a trade-off between background cleanliness and voice naturalness. For important interviews, it's better to record sound in a quiet room than rely on post-processing.
Preservation and export of results
Once you've done all the trimming and filter manipulation, you'll have a saving phase, and the system will ask you to choose the file name and the storage location. By default, the files are stored in the internal memory in the folder. MIUI/sound_recorder.
For easy access to edited files, it is recommended to immediately rename them, giving clear names, which in the future will save time when searching for the necessary information among dozens of files with names like Rec_20231025_143000.
If you plan to transfer a file through messengers (WhatsApp, Telegram), make sure the file size does not exceed the forwarding limits.Pruning helps to reduce the size, but the WAV format can still be too heavy for fast sending.
⚠️ Note: When transferring files via instant messengers, audio quality can be further compressed. Use the Send as a file or cloud storage to transfer important material in its original quality.
Remember to back up important records regularly on a cloud drive or computer. Smartphone internal memory is not the most reliable place to store unique data, especially given the risk of physical damage to the device.
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Regular backup of audio recordings to an external medium or to the cloud is the only guarantee of the safety of important data in the event of a system failure or loss of a smartphone.