The Redmi Note series has long proven itself to be a reliable multimedia device, and the Redmi Note 8 is no exception. The built-in voice recorder here offers a basic but functional set of tools to record lectures, interviews or personal notes with decent quality. However, there are often situations when a record is made successfully, but contains unnecessary pauses at the beginning, random phrases at the end or extraneous noises that need to be removed.
Fortunately, the MIUI system on which the smartphone shell is based provides built-in capabilities for editing audio files without the need to install third-party software. The user does not need to be a professional sound engineer to perform a simple cropping. The whole process takes only a few seconds and is performed directly in the standard Dictophone application. In this article, we will detail the algorithm of actions so that you can easily edit your audio recordings.
It’s worth noting that the interface may vary slightly depending on the firmware version installed on your device. However, the logic of the editor remains the same for all models of the Redmi Note line. We will consider not only the process of cropping, but also the nuances of saving results, and answer frequent questions.
Preparation for editing: search and launch of the file
Before you start modifying the audio, you need to find the right file in the device's memory. The standard voice recorder app on Xiaomi automatically sorts records by date of creation, which greatly simplifies navigation. If you just finished recording, it is usually already open on the screen, and you do not need to go to the search menu.
If you're planning to edit an older file, run the Recorder app through the home screen or the Tools folder. At the bottom of the interface, you'll see a List tab or a list icon that will open up an archive of all the stored audio recordings, and you can search by name or just scroll through the tape before the date.
It is important to understand that only files stored in the phone’s internal storage are edited. Cloud copies that have not yet been downloaded to the device must first be downloaded. Also make sure the file is not corrupted and playable correctly, otherwise the editor may not start or work with errors.
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If you can’t find an entry in the standard list, check the folder «MIUI/sound_recorder» through the file manager – sometimes system failures hide files from the application view, but they remain on the disk.
Once you tap the recording, it opens in play mode, and this screen displays the timeline, the current time and the control buttons, and that's where we're going to start the cropping process.
Editor interface and basic tools
When you open the recording, look at the bottom control panel, where you have the "More" button (often three dots) or the pencil icon that's responsible for editing. In some versions of MIUI, the "Edit" button is made separately, and clicking on this button activates the editing mode.
So you'll see a sound wave interface, which is a graphical display of the volume of sound in time, where the peaks correspond to loud areas and the flat lines correspond to silence. For accurate pruning, this is a critical element. You'll see two sliders, one at the beginning of the segment and one at the end. As you move them, you set the boundaries of the fragment left.
- 🎚️ Boundary sliders – allow visually cut off the beginning and end of the recording, leaving only the central part.
- ▶️ Listening button – allows you to check the selected segment before saving, so as not to remove the desired.
- 💾 Save button – Finalizes the process by offering to save changes to the current file or create a copy.
Using a sound wave allows you to surgically determine where speech begins and ends, which is especially useful if you have long pauses or rustles to remove at the beginning of the recording. Don't rush to save the result immediately; always check the boundaries.
Step-by-step instruction for audio cropping
Now, to go directly to the algorithm, to avoid errors and data loss, follow the sequence described below. The process is intuitive, but requires careful installation of crop markers.
☑️ The recording clipping algorithm
First, move the left marker to the point where playback should start. The system can offer a 0.1 or 0.5 second step, which ensures high accuracy. Then similarly adjust the right marker, cutting off the excess tail end.
Once you set the boundaries, press the play button. You'll only hear the part that's left between the sliders. If you're comfortable, click Save. The system will offer two options: Save (rewrite the original file) or Save as (create a new file with cropped content).
It is recommended to always choose the option "Save as" that will create a copy of the file with the name " edit" or similar, and the original will remain intact. In case of an error, you can always go back to the source and try again without losing important information.
⚠️ Note: If you choose to overwrite the original file, it will be impossible to recover the seconds deleted when trimmed with standard system tools. Always back up important interviews or lectures before editing.
Fine tuning and noise removal
While Xiaomi’s built-in editor isn’t a professional studio tool, it does allow for basic audio cleaning. Removing the silence at the beginning and end is the first step to quality recording.
If there is a long pause in the middle of a recording, you can't cut it without tearing the file apart. The editor only works with the outer edges of the allocated segment. The middle pauses would require file separation, which is not implemented in the standard Redmi Note 8 app, in which case it's easier to save two separate fragments or use third-party software.
However, for most household tasks, the dictaphone's capabilities are sufficient: You can remove the noise of the tape recorder switching at the beginning of the recording (a characteristic click) and the silence at the end when you forgot to stop recording in time, which makes the file more compact and easy to listen to.
Why can't you cut the middle?
When working with long lectures lasting several hours, the rendering process can take time.Do not turn off the screen or turn off the application at this point to avoid resetting the process.
File formats and compatibility
The Redmi Note 8 is the default.m4a (AAC codec) audio format, which provides good quality at a relatively small file size, which is optimal for mobile devices. When trimmed and saved, the file remains in the same format, which ensures compatibility with most players and instant messengers.
However, if you plan to transfer the recording to older devices or specific hardware, compatibility issues may arise. In such cases, the.mp3 format would be more versatile, but the standard Xiaomi voice recorder does not allow you to change the recording format or save in the application settings.
Below is a performance comparison table so you understand what material you are working with:
| Parameter | Default value | Description |
|---|---|---|
| File format | .m4a (AAC) | Modern format of compression with losses |
| Frequency of sampling | 48 kHz | Standard for Video and Quality Audio |
| Bitreit | ~128-160 kbit/s | Balance between quality and size |
| Channels | Stereo/Mono | Depends on the microphone settings. |
If you critically need to change the file format (e.g. convert to MP3), you will have to use online converters or special converter applications after you have finished trimming.
Common problems and their solution
Users may encounter a number of common difficulties in using it, such as the save button being inactive, which happens if you don't select a crop area, the sliders have to be spaced apart, otherwise there's nothing to edit.
Another common problem is desynchronizing sound and visual waves with very long recordings, a rare system bug that can be treated by restarting an application, and it's also worth remembering the free space: saving a copy of a file ("Save As") requires a memory size equal to the size of the original record.
- 📉 Lack of space – free up a few megabytes in storage before saving a copy.
- 🔇 No sound when pre-hearing – check if the phone is in silent mode or if the volume of the media is turned down.
- ❌ Saving Error – Check the application’s access rights to the file system in the privacy settings.
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The main reason for errors in saving is overcrowded storage. Always check for free space before working with large audio files.
If the recorder app is behaving unstable, try clearing its cache through the Settings menu → Apps → Recorder → Memory → Clear the cache. This will not delete your records, but will fix possible software failures.
⚠️ Warning: Never remove the system application "Dictorphone" or "Sound Recording", even if you have alternatives.This may disrupt the system logs and call recording functions on some firmware versions.