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STEP 9 - ADVANCED AUDIO PROCESSING CONSIDERATIONS
A unique feature of the
RIGblaster Pro
is that it is possible to process, equalize, compress or
expand transmitted audio. This is done simply by routing your microphone audio into your
computer and back out to your radio while processing the audio (real time) with appropriate
sound card software.
In order to enable this feature and begin to make digital recordings of station operation, plug
the jumper on the P6 Jumper Block to send the microphone audio to the PC. See the section
labeled “MIC MODE JUMPER – P6” later in this manual for jumpering diagrams. A cable from
the
RIGblaster Pro
MIC OUT (R7) to the Computer Sound Card MIC IN is also needed to
enable this feature.
The PC must have an available Mic In and must have a full duplex sound card that will pass
the sound card microphone input through software and then back out to the
RIGblaster Pro
.
To enable microphone audio processing,
turn on the “process” switch (F10). The function of
process mode is to redirect audio from the radio microphone through the PC and back to the
radio.
Process Mode of the
RIGblaster Pro
to process the audio from the radio microphone is
enabled by utilizing appropriate real time equalization software on the PC and set the sound
card recording control panel to feed microphone audio through the software, and then the
sound card playback control panel to send the audio back in to the radio through the
RIGblaster Pro
. Note that this is a different sound card setup than is used by digital mode
sound card programs. Also note that if the sound card is set incorrectly there could be
feedback and/or echo conditions. Voice is not heard coming from the PC speakers, as they are
muted on transmit in the process mode to prevent acoustic feedback.
The gain of the sound card input and output will need to be set for minimum distortion and
minimum noise by determining the optimum settings for equipment. Do the basic setup with
the equalizer softwar
e set to “flat”. When satisfied that the microphone is being passed through
the PC with little or no change, then experiment with equalization of the microphone audio.
Equalization control in the voice spectrum of 100 to 3500 Hz will have a noticeable effect on
voice. Trying to boost equalization outside of this spectrum may overdrive the sound card or
radio audio stages with microphone handling and room noises. It is generally desirable to
totally cut or filter out the frequencies outside the voice spectrum range. Take into
consideration that equalization can be done in any way to make the audio sound either better
or worse. Attempt to achieve the most intelligible audio for DXing and general communication.
Wideband FM or AM operation prefer the most natural audio for a high fidelity sound.
If using compression or noise reduction software, all of the same issues of doing equalization
are present.
Summary of Contents for RIGblaster Pro
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