How Portable Audio Studios Work

The most important piece of equipment in any portable studio is thedigital audio workstation(DAW), also known as acomputer. Depending on the software on the computer, a DAW could act as a recording device,mixerandsequencer. By handling so many tasks, a good DAW reduces the need for additional equipment.

Handling audio files requires a lot of computer horsepower, particularly if you're mixing lots of channels. For that reason, it's important to choose a computer with a fastmicroprocessor. For a while, it seemed like Mac computers would always reign supreme in the world of media computing. But some audio engineers say that the differences between Mac and PC performance are negligible. As long as the computer you pick has a powerful CPU and a large, fasthard drive, you're in good shape.

Another piece of the portable studio setup is theaudio interface. While many computers have input and output ports andsound cards, they aren't always capable of recording or playing back professional-quality sound. For that reason, many engineers who set up portable studios rely on additional audio interface devices. These devices range in size from a handheld gadget to a machine the size of a heftyVCR.

Audio interface devices usually have multiple input and output ports. Many have both analog and digital ports, which covers all musical instruments andmicrophones. Some also act asanalog-to-digital converters(ADCs). That means the device can accept an analog signal and then digitize it. It converts sound into information that a computer can manipulate.

Analog signalsare continuous waves that vary in frequency and amplitude. An analog audio signal'sfrequencycorresponds to the sound'spitch. The wave'samplituderepresents the sound's volume. Digital signals aren't continuous. Instead, a digital signal is a series of snapshots calledsamples. The number of times a computer takes a snapshot of an analog signal per second is thesampling rate. Higher sampling rates translate into smoother, more natural sound.

并不是所有的音频接口也adc。年代ome audio engineers might prefer to use a dedicated ADC, then run the signal coming from the ADC through the audio interface and into the DAW. Either way, the audio interface carries the signal to the DAW. Audio engineers use the DAW to manipulate individual channels and mix the sound into a final track.

The DAW might be the most important hardware component in a portable studio, but it's useless without the right software. Keep reading to learn about the applications audio engineers use to produce music.

Even a powerful DAW is useless without the right software. There are several music studio software packages on the market. Some provide audio engineers with a full suite of functions ranging from mixing and recording to adding effects like echo and reverb. They also range in price -- some are several hundred dollars and others are available free of charge. Most of these software packages provide the same basic set of functions. These include equalizing, editing and mixing. Let's look at each of these in turn.

In audio production,equalizingrefers to tweaking the frequency levels on an audio signal. A good software package should allow engineers to do this to individual input channels as well as the overall mix. The software includes an interface known as anequalizer. Equalizers divide frequencies into segments calledbandsand usually range from 20 hertz (Hz) to 20 kilohertz (kHz), the range of human hearing. By tweaking the intensity levels for the frequency range of an audio signal, an engineer can emphasize or deemphasize certain pitches.

Methods for editing and mixing tracks vary from one software package to another. In general, most packages let you manipulate sections of a track or mix together multiple recordings to create the best final edit. Many packages allow you to cut, copy and paste sections of a track into a new format. Think your chorus should come in a bit earlier? No problem. Use the software's interface to shift it up a few measures.

编辑和混合也可以给其他工程师options, such as adjusting the volume of particular channels or sections of the track, fading sound in or out or shifting sound so that it pans from one set of speakers to another.

One important task audio engineering software handles is working withMIDIdata. MIDI stands for Musical Instrument Digital Interface, and is the standard by which computers, electronic musical instruments and other digital devices share musical information. MIDI isn't a music file -- it's a series of digital instructions that tell digital devices how to create a specific sound. Most audio engineering software can edit and mix MIDI data with other recorded audio formats.

What might a portable studio look like? Find out in the next section.

Let's imagine that we have the opportunity to put together a robust portable audio studio. Which equipment do we choose? Which software packages are good choices? How much is it going to cost?

Assuming we aren't going to try and retrofit a current computer system, we'll have to start from scratch. Right from the start we have a choice: PC or Mac? There are several software applications available for both kinds of computers. There are PC and Maclaptops有我们需要的马力run an audio studio. The choice usually comes down to personal preference. Some people think that the best choice for people with little computer experience is the Mac, which as a reputation for being user friendly. Let's go with that -- we'll choose a MacBook Pro as our digital audio workstation.

To supplement the computer, we'll need an externalhard drive. This is where we'll store recorded audio. By porting storage to an external drive, we free up the computer's resources to handle all the applications we'll be using when producing music. Audio files can be very large, so it's important to choose a hard drive with a lot of space. For example, we could choose the G-Tech G-Drive Q, which has 500 gigabytes worth of storage.

What about the software? We could go with a free software package like Audacity, but that means giving up on some features. For example, as of this writing, Audacity can't edit or mixMIDIdata. We could use GarageBand, a popular Mac audio sequencer and audio processor. But compared with other software packages, it just doesn't offer a lot of features. If we want a really robust studio, we'll need something like Pro Tools from Digidesign. Applications like Pro Tools give engineers more control and options when working with sound files.

Once we settle on the software, it's time to think about audio interfaces. Not all audio interfaces are compatible with every software package. That's why we chose our software package first. So the first step in choosing an audio interface device is to make sure it will work with our DAW's software. Let's assume we're using Pro Tools and need a device with at least two analog inputs. Digidesign offers the Mbox 2, which not only has this capability but also comes with a copy of Pro Tools software.

On top of this, we'll need to invest in cables,microphones, headphones andspeakers. If we want to produce music using the MIDI standard, we'll probably also need to buy a MIDI keyboard controller. While it's important not to skimp on these items if we want high quality sound, we won't necessarily have to break the bank either. Let's assume we pick reliable but affordable hardware.

The cost for the studio would break down like this:

The total cost for this studio is $4,025. While that's a healthy chunk of change, it's much less expensive than a traditional recording studio. We could always cut corners and choose more moderately-priced equipment and software, but it's true that you get what you pay for. If money is no object, we could spare no expense and buy the best equipment available. Then you'd really see a hefty bill.

To learn more about recording audio and related topics, take a look at the links on the next page.