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Multimedia Madness 2 #12
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Multimedia Madness - Volume 2 - Issue 12 (SAMS Publishing) (November 25, 1992).iso
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Introduction
The Pocket Recorder is a simple, easy to use interface for recording
waveform data in both 8-bit and 16-bit formats. Pocket Recorder is
the first in a family of multimedia pocket tools from Media Vision.
You can use Pocket Recorder to record and playback waveform files
(*.wav) from any Windows applications. You can also splice and blend
files together for interesting audio effects. By default your view
of the file being displayed is of the entire file and the total length
of your file is always displayed in seconds format. Figure 1 below
describes the interface's buttons and meters. Your interface may
look different depending on your PC's capabilities.
Operating Requirements
IBM personal computer or compatible
Windows 3.1
2 MB RAM
Hard Disk
File Functions
New
Creates a new file, and presents the user with a dialogue box for
specifying recording parameters.
Open
Opens an existing waveform file, and presents the user with a standard
file requester dialogue box.
Save
Saves the current waveform file. If the current waveform is untitled
the user is prompted to input a standard file format.
Save As...
Lets you save your file under a different name and extension. Save
As.. saves the current contents of the file being edited to a new
file, without affecting either the contents or state of the current
file.
Revert
Causes the current waveform file to revert to the last saved version.
This feature is helpful when you accidentally edit a wavefile.
Exit
Exits the Pocket Recorder application, if there is an open waveform
file currently being edited, you will be prompted to save changes.
About
Displays information on which version of Pocket Recorder you are using
and also displays the Media Vision logo.
Edit Functions
You can insert a file at any location within a waveform file (it simply appends
the selected file to the current file, thereby increasing its overall
length). However, you cannot mix two files which were recorded at
different sample rates. The two files to be joined must be of the
same sample rate. Pocket Recorder does not support sample rate conversion.
Insert File
Lets you place a file within your current file. The placement of the
file depends on the position of the insertion point.
Blend File
Effectively overlays the files on top of on another. The duration
of the final file will be the same length as the longest file used.
This features essentially merges two waveforms into one file.
Note!
Saturation levels must be monitored while blending files. Saturation is
another form of distortion that occurs when the amplitude of a blended
file is excessive. This is sometimes referred to as clipping.
Delete to Start
Deletes the file contents starting from the insertion point to the
start of the file.
Delete to Finish
Deletes the file contents starting from the insertion point to the
end of the file.
Effects Functions
Louder
Increases the amplitude of the wavefile by 50%.
Softer
Decreases the amplitude of the waveform file by 50%.
Faster
Increases the speed of the waveform file by 100%.
Slower
Decreases the speed of the waveform file by 50%.
Higher
Raises the pitch of the waveform file. The speed and duration are
not affected.
Lower
Lowers the pitch of the waveform file.
Echo
Adds an echo effect to the waveform file.
Reverb
Applies a reverb characteristic to all waveform data in the file.
Reverse
Plays your waveform file backwards.
Using Pocket Recorder
To Play a Waveform File
1. Select "Open" from the File menu. The Open Wave File dialog box
appears.
2. Click on the disk drive or subdirectory where you have stored
your waveform (*.wav) files.
3. Highlight the waveform file you want to open. Click on the OK
button. The waveform file is automatically loaded into Pocket Recorder's
window.
4. Click on the Play button (or press the space bar) to playback the
waveform file. As it is played back, notice the activity of the VU
meter. Both bars moving confirms that you have selected a waveform
that was recorded in stereo. The green bar represents channel 1 and
the blue bar represents channel 2.
To Record a Waveform File
Several options are available when recording waveform files. However,
if a selection appears greyed-out, it simply means that it is not
available with your version. Before proceeding with these steps,
ensure that your microphone or audio device is plugged into either
the microphone or line-in input plug on your Pro AudioSpectrum board.
1. Select "New" from the File menu. The Record Parameters dialog box
appears and presents several options from which to choose:
Sample Rate: Select either 44.1 kHz, 32.0 kHz,
22.05 kHz, or 11.05 kHz. Keep in mind that the larger the sampling
rate, the more disk space is required to store the waveform file.
Channels: Stereo. If you are going to record
in stereo, click on this button. Otherwise select Mono.
Compression: Select either 4:1, 2:1 or none.
Sample: Select either the 8 bit mode or the
16 bit mode. If you plan to use this waveform file with another application,
check to see that it will accept a 16 bit waveform file first.
Pocket Recorder does not convert waveform files from different
formats.
2. Click on the Record button (red circle) to record from your selected
audio source. Speak into your microphone or activate your audio source. Keep
a close eye on your VU meter. The record mode changes the VU meter's
bars from green and blue to red.
3. Click on the Stop button (square) to end the recording process. Notice
how the File Status window constantly informs you of your operating
status.
4. Select "Save As..." from the File menu. Type in a name for your
new file when Pocket Recorder displays the "Save Wave File" dialog box.
To Exit from Pocket Recorder
Select "Exit" from the File menu. If you have modified your current
waveform file, you will prompted to save these changes.
Glossary
The following definitions describe terms you will encounter using
Media Vision multimedia products.
Clipboard
A clipboard is where sample data is saved when you cut it from a sample
so that you may paste it or mix it into another sample. This clipboard
should not be confused with the normal Windows clipboard.
Insertion Point
The Insertion Point is like the cursor in a word processor. It is
where pasted data will be placed or other data may be inserted depending
on the operation. The Insertion Point appears as a vertical line
and can be moved by clicking the left mouse button any where in the
Pocket Recorder window.
Microsoft Multimedia Wave File(.WAV)
This is a format for sampled sounds defined by Microsoft for use with
their Multimedia Extensions for Window.
Sampled Sound
Sampled sounds are sounds which have been recorded in a digital format
and saved on your system for playback through a sound board.
----------------------------------------------------
WIN.INI ENTRIES
Pocket Recorder preferences can be found in your win.ini file.
In order to change the default values, remove the semi-colon (;)
from the start of the line and change the value. A sample of some
non-default entries is shown below.
[Media Vision Pocket Recorder]
; Current UI support allows for:
; - one or two channels.
; - variable sample rates between specified minimum and maximum.
; - eight and/or sixteen bits per sample (put commas between multiple values).
; - file compaction by two and/or four (put commas between multiple values).
; Buffer Management
; - buffer size should be a power of two (default 32768).
; - number of buffers used for playback and record ahead (default 5, max 16).
NumChannels=2
MinSampRate=1
MaxSampRate=44100
BitsPerSamp=8,16
;Compression=2,4
BufferSize=32768
NumBuffers=8