Dsp-Based Auxiliary Circuits (For Tx); Speech Processor (Af Processing) - Kenwood TS-590SG Manual

4.7 DSP-based Auxiliary Circuits (for TX)

4.7.1 Speech Processor (AF Processing)

TS-590S/SG also incorporates an AF-type speech processor. Though it is an AF type, the speech processor provides
sufficient compression through a unique signal processing technique.
A typical voice signal tends to have the highest amplitude in the low frequency range with smaller amplitude as the frequency
range increases. That is the reason why distortion is likely to occur in the low range while excessive compression processing
is used. On the TS-590S/SG, signal processing is conducted to reduce the difference in amplitude between the low and
high range when compression is performed. As a result, the speech processor can raise the talk power while minimizing
rasping distorted sounds.
Besides, since the relatively emphasized high range has an effect of raising the intelligibility of the voice, the speech
processor has now become an effective feature to receive a reply in a pileup.
Figure 4-21 shows how the waveform changes when the speech processor is toggled between active and inactive.
You can see that when the speech processor is activated, the differences in amplitude are averaged and the talk power
is increased.
The speech processor has two settings: HARD and SOFT.
HARD is a setting that you choose so as to increase talk power while tolerating some distortion and SOFT is a setting
to minimize rasping distorted audio. Select either of the two settings according to your predilection and operational
circumstances.
Figure 4-21 Speech Processor (Active/Inactive)
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