Features Of The Built-In Dsp; Dsp Circuit; Ideal For Mobile Operations: Dnl; Principle Of Dnl Operation - Kenwood TS-480 User Manual

Features of the Built-in DSP

DSP circuit

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Ideal for mobile operations: DNL

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When you hear the crackling of ignition and other types of pulse noise, it is possible to remove it
using the noise blanker (NB); however, this does not work in all cases. Depending on the type of
noise, or if there is a very strong signal close by, the pulse noise may remain and be demodulated.
This can result in an unpleasant sound being emitted from the speaker, thus reducing the clarity of
your target signal. In such cases, the DNL (digital noise limiter) can reduce pulse noise that has
been demodulated at the AF stage, effectively extracting your target audio signal.
Fig.13 is a block diagram illustrating in principle how the DNL operates.
Fig. 13: Principle of DNL operation
BPF
LPF
The digital signal processor equipped on the TS-480 is the 16-bit
fixed-point TMS320VC5402 from Texas Instruments, which
offers excellent value for the money. Running at 100MHz, it
provides double-precision arithmetic operations (equivalent to
32-bit processing), making it more than capable of serving as an
AF DSP. Thanks to this, the TS-480 offers many powerful
features of use in HF operations.
Delay device
Removal
Calculation of
amplitude
component
variation
Delay device
22
NEW
Derivation of
of DC attenuation
coefficient