Digital Signal Processing Reference
In-Depth Information
a n al og - i n pu t
trigger
re l ai s
1
data wi ndow
ti me domai n
FFT
freq.-domai n
freq. parame
li st
parameter
net data
counter
cycles
coded switch
trig ger
an alog -inp ut
r elais
2
da ta- win do w
time do main
wr ite data
counter
cy cles
read
de lay
fre q.d oma in
frequ.parame
pa r ame te r
3
ne t data
counter
cy cles
co de d sw itc h
analog-i n
trigger
re l a is
data window
ti me dom ai n
FFT
freq.paramet
netprognosis
formula
Aktion
mess age
4
analog-i n
trigger
re l a i s
5
data window
ti me dom ai n
FFT
freq.paramet
netprognosis
formula
Aktion
message
1
•
Direct diagram for network generatio . Signals are recorded via microphone and
transformed. Then the frequengcy parameters are detected and the*.nnd file created.
Finally the *.nn file is created by means of network training. Disadvantage: lengthy
detection of optimal parameters. Constant use of microphone.
•
2
Diagram for generation of spectra multi files. Each of the 5 words is spoken 10 times. The
altogether 50 spectra are filed in a total file or multi file as basic material for all further
tests (reference file). All further tests from now on without microphone.
3
•
With the help of the reference file, an optimal *.nnd file can be detected in tests by smart
selection of the parameters. From this, the *.nn file can be created.
•
4
Prognosis switch: via microphone, the tolerance of the neuronal network can be tested.
•
As the simplified speech recognition process is extremely dependent on the speaker
, the
quality of the network can be controlled most easily by a reference file of the speake.
5
llustration 293:
The block diagrams of the speech recognition project in use
In the electronic document, the 5 switches can be activated by clicking the colored buttons..
Unfortunately, it is not (yet) possible to directly process complete “bed- of- nails”
patterns in the form of two- dimensional arrays with the DASYLab. Thus, we have to use
“acoustic patterns” as in chapter 4, lasting exactly 1s long each. Also picked up again is
the example from chapter 4 in form of the acoustic steering of a forklift with the help of
the words “up”, “down”, “stop” , “left” and “right”.
