1.
声音录制的基本概念.
2. 开始录音之前的配置工作.
2.1
选取一个音频设备.
2.2
选择音频输出格式.
2.3
根据需要选择音频线路.
2.4
选择编码方法.
2.5
选择保存录音记录的文件夹.
3. 操作
3.1
录音.
3.2
录音暂停时播放记录.
3.3
保存音频数据.
3.4
管理录音记录.
4. 理解混音器和录音线路(高级用户).
1. Understand some basic
concept of sound recording.
Record sound on a PC is through a sound card, convert
analog signal to digital. it controlled by the following
parameters:
•
Bit rate:
Bit rate (or bit depth) describes how many binary digits
a digital audio file uses to describe the amplitude of
the audio it is recreating. Each bit doubles the accuracy
with which an amplitude level can be described (16 bit
= 65,536 possible levels). Record on a PC , it can be
16 bit or 8 bit. Obviously using 16 bit will create higher
quality sound but need more storage.
•
Sampling rate (frequency):
Sampling rate is the number of values (samples) measured
per second in the conversion of audio from analog to digital.
The standard CD digital rate of 44.1 KHz restricts the
maximum sampled frequency to 22.05KHz. For a point of
comparison, Human hearing is usually said to be 20Hz to
20KHz. Smart PC Recorder support following frequencies:
8000, 11025, 16000, 22050, 32000, 44100, 48000. The higher
the frequency, the higher sound quality.
• Channel number:
It can be either stereo or mono. Stereophonic sound, commonly
called stereo, is the reproduction of sound, using two
independent audio channels, through a pair of widely separated
speaker systems, in such a way as to create a pleasant
and natural impression of sound heard from various directions
as in natural hearing. Monaural (often shortened to mono)
sound reproduction is single-channel. Typically there
is only one microphone, one loudspeaker, or, in the case
of headphones or multiple loudspeakers, they are fed from
a common signal path, and in the case of multiple microphones,
mixed into a signal path at some stage.
2. Configurations before
recording.
2.1 Select an audio device.
All audio device (sound cards) are listed in the device
pull-down list window. There you can select one of them.
But usually you have only one sound card installed on
your computer.
2.2 Slelect output format.
Selecting output format means selecting the combination
of bit rate, channel number and sample rate (frequency).
All combinations Smart PC Recorder supports are listed
in the second pull down list window.
2.3 Select an audio line according
your recording task.
This is the most subtle configurating task. Which audio
line to be selected depends on what are you going to record.
•
Record Streaming Audio
A) Find audio line for streaming audio recording
Usually the audio line for streaming audio recording has
the name of Stereo Mix or Wave out .But its name may be
different for different sound card. If you know the name
of stream audio line, you just click on the checkbox shown
at left side of the name of the line.
B) Open other media player to play audio.
C) Click the record button to start recording, sound played
by the media player will be recorded.
•
Record from microphone
A) Connect microphone to your PC on jack of the
sound card.
B) Activate the audio line of microphone by checking the
box on the left-side of the line name.
C) Speak to microphone.
D) Click the record button to start recording.
•
Record from audio cassette player or DVD player
A) Connect audio cassette player or DVD player to your
PC. Use a single stereo audio cable to connect audio cassette
player to the line in jack of the sound card:
Use a stereo audio cable which one end has two single
channel plugs to connect audio cassette player to the
line in jack of the sound card:
B) Select the audio line of Line In by click the check
box on left-side of it.
C) Play the audio cassette player or DVD player.
D) Click the record button to start recording.
2.4 Select encoding method.
Click button "Settings" to bring forth the Settings
window. There you can select one from the two encoding
methods. One is PCM encoding, which stores uncompressed
raw audio data (.wav files). Another is MPEG encoding
that enable you to compress audio data into MP3 files.
But please note: if you choose sample rate lower than
16000 or bit rate other than 16, even you select MPEG
encoding method, audio data will be saved in .wav files
rather than in MP3 files.
2.5 Select a folder for saving
records.
Click button "Settings". This will bring forth
the Settings window. The folder can be set there. If you
didn't set the folder or the folder you selected does
not exist, the program will prompt for saving location
as you go to save a record.
3. Operations.
3.1 Recording.
Press start button to start recording and press stop button
to stop recording. Be careful to note where the thumb
of the progress slider locates when you begin recording.
The position the thumb indicates is where new data will
be written. So data behind this position will be overwritten
while recording continues.
3.2 Playing during pause of
recording.
When recording is paused, the play button is enabled.
Then you can press it to play sound that has been recorded.
Press stop button to stop playing.
3.3 Saving recorded data.
After recording, or when recording is paused, click save
button to save data. Depending on your settings, data
maybe save in raw format or compressed into mp3 format.
After saving a file, a new record will be added into the
playlist.
You can also choose to pack audio data into a VEA file.
To do this, click "Save as VEA" button to save
data. VEA files enable you to save some comments together
with the audio data for further reference. For details
about VEA file, click here.
3.4 Manage records.
All saved records will be displayed in the playlist window
at right side of the user interface. Beneath the playlist
window, buttons and a progress slider are provided for
record replaying. Clicking right mouse button in the playlist
window will bring forth a popup menu, by using it you
can add audio files into the list or remove items from
the list.
4. Understand mixer and record
audio line(inside learning).
A sound card mixer is the part of a sound card
that can mix the sound input from different sources.
The following schematic shows how a sound card's mixer
manipulates sound from different sources:
Play controls on a typical sound mixer:
| Control |
channels |
Controlled source |
| Wave* |
stereo |
Sound generated by the computer when playing
MP3, WAV,...
Also the sound when playing a CD-DA in some programs
(Windows Media Player, Media Player Classic) or
playing a MIDI in certain programs (JetAudio) |
| MIDI/SW Synth |
stereo |
Sound generated from a MIDI device or synthesizer
(electronic keyboard, Windows Media Player, IrfanView,
Media Player Classic, ...) |
| CD playback |
stereo |
Sound generated when playing a CD-DA in most
programs (JetAudio, IrfanView, ...) |
| Microphone |
mono |
Sound entering through an internal microphone,
or the microphone jack |
| Line in/Aux |
stereo |
Sound from an external source (iPod, television,
etc.) |
| SPDIF |
mono |
Uncommon digital interface of some devices |
| PC speaker |
mono |
Sound generated in the old internal PC speaker.
This is the sound heard in old MS-DOS programs
and on boot (on PC's) |
| Volume control |
stereo |
Mixed sound sent to the speakers (output) |
TV tuner cards and other similar devices output their
sound via the Wave channel.
Record controls:
| Control |
Channels |
Source |
| Stereo mix |
stereo |
Mixed sound sent to the recorder |
| Mono mix |
mono |
Mixed sound converted into mono, sent
to the recorder |
| Microphone |
mono |
Sound from the microphone that is
directly going to be recorded |
Record streaming sound
As this sound is controlled through wave control, you
have to set this volume in the playing control (maybe
it's convenient to mute all others, except volume control
if you want to hear it meanwhile). In recording or playing
select stereo mix or mono mix. In this way you can also
record any other internal sound of your PC, i.e. voices
of TTS engines, sounds of the operating system.
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无限制的软件功能
