Compu-TTY KA300TX Instrukcja Użytkownika Pobierz pdf (Strona 15)

U.S.

Patent

Jan.

30,

2007

Sheet

12

0f

13

US

7,170,404

B2

>

1

> )

DD)

MICROPHONE

8

l

ANALOG

TO

/\12

DIGITAL

CONVERSION

J,

123

EXPECTED

TONE

I

BAND PASS

/\

122

,\

FREQUANCY

INPUT

FILTERING

l

AMPLITUDE

/\124

DETECTING

i

SAMPLE

/\

126

DECIMATION

l

PULSE

MATCHING

/\128

FILTERING

132

’\

EXPECTED

SEQUENCE

ENSEMBLE

p130

LENGTH

INPUT

’

AvERAGING

136

PSEUDO

-

RANDOM

PATTERN

MATCHING

/\134

’\

SEQUENCE

INPUT

'

CORRELATION

I40

’\

THRESHOLD

DETECTION

p138

INPuT

’

DECISION

DETECTION

SIGNAL

F:

2.

LE

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 34 35

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