Can voice memos recorded on iPhone be improved clearly?

iphoneで録音したのボイスメモはクリアに改善できるの?

Factors that make you feel the difference in sound quality from the recorded material

I'm Yamakawa, who runs a noise removal and repair service for voice data. The voice memo app installed on the iPhone is convenient because you can easily record conversations. However, when I play back the recorded data, there are many cases where I ca n't hear the essential content because there are a lot of extra sounds from the cafes around me that I didn't care about on the spot .

□ Noise that is worrisome when recording

・ Conversation in the next seat

・ The sound of tableware and ice around the drink bar

・ Noise outside the window (car traffic noise, etc.)

・ Greetings from BGM staff in the store

Because the human brain is excellent, it is controlled to focus on conversations and unknowingly distract other noises when the surroundings are noisy . This is the factor that makes you feel the difference in sound quality between the sound you are listening to in the field and the recorded data.

Voice memo handling cases and professional professional improvement difficulty

 

Couple conversation at a tavern (AA)
Interview at family restaurant (A)
Conversation between husband and wife in the living room (B)
Interviews / interviews in conference rooms where air conditioning is a concern (C)

Multi-person meeting (AA) in a large meeting room
Trouble conversation between contractors at the construction site (B)
Conversation over the telephone handset (AAAA)
Telephone conversation in the car while driving (AAAA)

Conversation away from the microphone (AAAAA)

Lecture with a lot of reverberation (A)

Improvement difficulty A (difficult) ⇄ C (relatively easy)

Comparison of listening to high-performance linear PCM recorders

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The above is the improvement difficulty level judged by a professional professional.

It is difficult to improve the data recorded by an amateur with a smartphone or an inexpensive IC recorder .

Even if an amateur who does not touch the voice editing application on a daily basis uses the free application in the dark clouds, there is a high probability that it will end up in vain .

Before and after examples of selfie videos

Data that is almost inaudible to conversation is difficult to improve even for professionals

 
auditionノイズ.PNG

Some smartphone apps and free voice editing software have a simple noise canceling function .

If used properly, it can be used to suppress the rustling of the surroundings, but it should be considered almost impossible to repair when the conversation volume is clearly low .

Specialized know-how is required for voice restoration. Even with professional video editors, it is not uncommon to outsource only sound conditioning to a vendor.

As a professional professional, we are working on removing noise from over 100 voice memos a year, but the improvement adoption rate of voice memos is about 60% . The reality is that there are many give-ups.

It is a rule of thumb to audition with earphones and headphones for sounds that are difficult to hear.

 
小型イヤホン

Voice memo Reproduction of hard-to-hear conversations recorded It is a rule of thumb to use headphones and earphones with high resolution . .. Many of the speakers that can be installed as standard equipment on smartphones and personal computers are of the lowest class, "just listen for the time being", so they are not suitable for listening to recorded conversations.

If possible, earphones for music of 8,000 yen or more are better

Even if you ask a professional to remove noise, it is difficult to experience the improvement effect if the speaker or earphone that reproduces the data has a low reproduction ability. Before asking a professional, first spend money on quality music earphones and headphones.

"Hybrid Sound Reform", a recording remodeling service, helps improve the recorded data of voice memos .
Trial is free except for very short sound sources .

Environmental noise in the video If you want to reduce the engine noise of a motorcycle or car

In addition to engine sounds and announcements of sound trucks that you want to turn off from voice, we also support a wide range of applications such as wind blowing, rubbing microphones and clothes, noise, clip noise due to volume over, noise removal due to equipment troubles and radio interference.

スクーター

Is the microphone echoing and hard to hear? Academic society voice recorder sound source

Important academic societies and lectures that require transliteration. I think there are many people who record the contents with a voice recorder. The other day, I received a consultation that the microphone in the venue was so loud that I could hardly hear the recorded content.

講義を与えます

Removal of wind noise in onboard interviews

"I interviewed a fisherman on board." I received a consultation as usual to reduce the wind noise mixed in the video cut, and received a free trial .

航海ロープ

Removes mobile phone radio noise mixed in band performance (with improvement sample)

When recording a performance with a linear PCM recorder, there seems to be a case where the recorded data gets quite terrible noise if the iPhone is nearby. It is not the noise of the environmental sound of the audience seats picked up by the so-called microphone, but the very strong noise that destroys the audio data itself.

We have worked to reduce unpleasant noise that interferes with the recorded performance.

静的