Cómo capturar audio de calidad

Mejor calidad de audio = transcripción más precisa

Usuarios de Sonix opinan sobre la grabación de audio

Pete Combs, KOMO Radio

Pete Combs

KOMO Radio

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Pete Combs Recording Tips

Intro of capturing great audio

My name is Pete Combs and I'm a reporter for K O M O KOMO radio in Seattle. I've been doing this for about 40 years and my life has basically revolved around gathering audio and putting it on the air.

The gathering audio part is what I want to talk to about because there's a lot you can do to make your audio presentations sound great and to improve the quality of audio for the purpose of transcription. For instance when you're doing phone audio you want to record that on a landline if possible.

Levels and cadence of speech

Speak slowly and make sure that there are no glitches in that landline connection. If there are, do them over again. It doesn't hurt and it could make the transcription a lot more clear. If you're doing it in person, the one thing I tell you, is make sure your levels aren't too high in the digital world.

You can certainly boost levels all day long but when you try to deal with levels that have gone too high and they distort, there's nothing much you can do the audio will just remain terrible. So if you have any doubt about the volume of your recording go low and you can adjust later.

Volume of recording and exact leveling

I usually do my recordings at 4,400 hertz or 44.1, and I use 64 bit audio when I do an MP3. For radio use I usually record MP3s at 44.1 kilohertz and I use a bit depth of 64 kilobytes per second. That's pretty clear. And again the volume is the key here. You don't want to get too loud.

Summary of capturing great audio

Try those as you're making recordings for transcript and if you have any problems remember this: Slow down. The slower you go the easier it is for the computer to figure out what you're saying. I'm Pete Combs. Good luck and happy recording.

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William Smith, creativo atrevido

William Smith

Creativo atrevido

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Capturing Great Audio

Recording environment advice

How do I capture great audio? The first thing that I try to do is just always record in a quiet space. So obviously you know reducing the noise and you're environment is super important and everyone says that but it's worth mentioning because it's something that you do need to kind of stress on a little bit.

I have a home studio which is just basically a renovated bedroom that I have converted into a place where I record. I took the closet and I kind of put acoustical tiles in there to make it more conducive to recording and I also try when I can to stand up while I'm talking. I just find that get a better sound that way.

Proper microphone techniques

The next thing that I always try to do is observe proper microphone technique. You know you don't want to be too far or too close to your microphone. The closer that you are the more you risk clipping or overdriving the further you are the weaker the vocal will sound. It might sound a little tinny or just distant and that requires you to do more to bring it up and make it sound good in the forefront of the recording.

I spent a lot of time coaching whoever I'm talking to to make sure that they're staying close to the microphone at all times and they're being in a consistent distance away from it.

Microphone suggestion - Shure SMB7

It also doesn't hurt to have good equipment so what I've tried to do is invest in some decent microphones. I use a Shure SMB7 microphone both for myself and for the guest. And I find that they sound really great. I don't have to do a lot to them in terms of processing.

I plug those into a Zoom recorder so I use Zoom H6 and I just find that it does a really great job recording. I've used other audio interfaces in the past and by far this is the best sounding one that I use as my Zoom. So I love to use that.

Editing & cleaning up audio

And then one thing that I like to do is actually edit the podcast you know go in after I've recorded things and take out filler words minimized breath, if I can, remove mistakes, dead air.

You know I'm just kind of clean things up to make things more concise. You know somebody is kind of rambling on and on about something I'll try to shorten it and I find that that does a lot in terms of how people think in terms of the quality of the audio.

Audio clean-up tool suggestions

The more concise that it sounds, the more confident that it sounds by taking out the stammers and stuff you know stutters and stuff like that, it's really helpful. Then I do some audio processing. So I use some plugins. I use one from Izotope called RX Elements and it's a bundled piece of software.

It allows you to take out hums and clicks and just little artifacts that you could find in your audio recording. There's another tool from Izotope that I use called Nectar 2 which has some really cool presets for different types of sounds and so I'll use that once in a while. I'll usually use a compressor to make sure that the audio remains at a consistent level because again it is hard sometimes to get people to stay in the same dynamic range and sometimes you don't want them to.

Sometimes you want them you know depending on what they're talking about. You know if there's excitement you want that to come through but you don't want to overdrive. You know with the sound is for the listener so I use a compressor. And then the final thing that I do is once I bounce down all the vocal tracks and the whole you know podcast basically into an MP3 file, I'll run it through Auphonic which is an online tool.

It's actually a desktop tool as well but most people use it as the online tool, and it's a leveler. And so just make sure that the volume of your podcast is optimized for mobile listening since most people listen to podcasts through mobile.

I found that that does a really good job at keeping you know the volume levels where they need to be. When you plug in earbuds are you putting in your car etc.

So those are the things that I do to get a good sound.

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Algunos consejos para capturar audio de calidad

Graba en interiores siempre que sea posible

En entornos exteriores con viento o ruido, lo ideal es grabar la mayor parte de la pista de audio en interiores o en un estudio. Si debes grabar en exteriores, el ruido de fondo o el viento se pueden evitar usando un "dead cat", "wind muff" o un protector antiviento, que son cubiertas de micrófono diseñadas para minimizar el ruido del viento. Es casi imposible eliminar el ruido del viento de la pista de audio mediante edición.

Instala una cabina de sonido

El mejor lugar para grabar audio es en una habitación pequeña con alfombra y tratamientos en las paredes (cuadros, cortinas, etc.) para evitar sonidos estridentes caracterizados por el eco. Los armarios llenos de ropa colgada son excelentes como cabinas de sonido improvisadas.

El equipo importa

La mejor manera de obtener audio claro y de alta calidad es utilizando un micrófono independiente en lugar de uno integrado. La mayoría de los micrófonos integrados son omnidireccionales, lo que significa que grabarán sonidos no deseados de todas las direcciones.

Los micrófonos unidireccionales son los mejores. La calidad de estos está casi garantizada, y puedes mover el micrófono para encontrar el mejor punto de captación. Los micrófonos son mucho más sensibles de lo que mucha gente piensa. Incluso orientar algunos micrófonos en diferentes direcciones puede cambiar drásticamente la cantidad de sonido que captas. Por lo general, un micrófono de solapa (lavalier) enganchado en la camisa de una persona captará el sonido de la forma más directa y clara.

Acércate al micrófono

Cuanto más cerca esté el micrófono del orador, mejor. Obtendrás una mejor calidad de audio, menos ruido de fondo y una mayor fidelidad de sonido. Además, por favor, enuncia tus palabras como si estuvieras hablando ante una audiencia en un gran auditorio.

Habla a un nivel equilibrado y uniforme

Incluso con un buen micrófono, un gran sonido no está garantizado. Los micrófonos pueden ser extremadamente sensibles a pequeños cambios de nivel. Aunque no le demos importancia a que alguien hable muy alto y luego muy bajo, eso suele ser demasiado para un micrófono. Los sonidos fuertes repentinos pueden causar distorsión, mientras que algunos sonidos muy bajos podrían no llegar a captarse.

Revisa tu audio

Usa auriculares para monitorear o revisar inmediatamente la calidad del audio y asegurar que no haya ruido de fondo. Nuestra percepción del sonido a menudo nos hace ignorar el ruido ambiental. Un ejemplo sencillo: imagina estar en una habitación con el aire acondicionado encendido. Después de un rato, ya no lo notarás. Pero de repente, se apaga. Ahora la habitación parece extrañamente silenciosa. Nuestro cerebro y oído se ajustan al entorno rápidamente, pero notan los cambios repentinos.

Lamentablemente, los micrófonos no se comportan de la misma manera. Un micrófono captará todo el ruido extra durante toda la grabación. Cuando lo escuches de nuevo, será muy evidente. Por eso siempre es importante revisar el audio (con auriculares) antes de grabar horas de contenido. ¡No querrás tener que repetirlo todo!

Conclusión

Tener audio de alta calidad es crucial para obtener grandes transcripciones. El ruido de fondo, el viento, las voces apagadas y los ecos resultarán fácilmente en una baja puntuación de calidad de audio. En Sonix, nuestros algoritmos de transcripción automatizada analizan tus grabaciones. Por lo tanto, dependemos mucho de ti. Asegúrate de que tus grabaciones se realicen en el mejor entorno posible. La cantidad de correcciones que tendrás que hacer será mucho menor.

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