Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
(1) A unique word detection system in a digital communication system comprising; an acoustic surface wave matched filter having a piezoelectric substrate, a first interdigital electrode disposed on said substrate, and a second interdigital electrode disposed on said substrate wherein a pattern of said second interdigital electrode is determined depending upon a unique word to be detected, an input means for applying an input signal which is binary phase modulated in IF band to said first interdigital electrode, and means for recognizing a unique word coupled with said second interdigital electrode when output level of said second interdigital electrode exceeds a predetermined level.
Claim 2
Dependent Claim
36 words
(2) A unique word detection system according to claim 1, wherein said input means comprises a conversion means which is supplied local frequency to convert input baseband data to binary phase shift keyed IF band signal.
Claim 3
Dependent Claim
25 words
(3) A unique word detection system according to claim 1, wherein said input means is a frequency converter which is a part of the receiver.
Claim 4
Dependent Claim
130 words
(4) A unique word detection system in a digital communication system comprising; an acoustic surface wave matched filter having a piezoelectric substrate, a first interdigital electrode disposed on said substrate, and a second interdigital electrode disposed on said substrate wherein a pattern of said second interdigital electrode is determined depending upon a unique word to be detected, an input means for applying an input signal which is binary phase modulated in IF band to said first interdigital electrode, an output means coupled with said second interdigital electrode which coherently detects an output signal of said second interdigital electrode, and means for recognizing a unique word and the received phase in the demodulator coupled with said output means when absolute value of level of said output means exceed a predetermined value.
Claim 5
Dependent Claim
36 words
(5) A unique word detection system according to claim 4, wherein said input means comprises a conversion means which is supplied local frequency to convert input baseband data to binary phase shift keyed IF band signal.
Claim 6
Dependent Claim
25 words
(6) A unique word detection system according to claim 4, wherein said input means is a frequency converter which is a part of the receiver.
Claim 7
Dependent Claim
24 words
(7) A unique word detection system according to claim 4, wherein said input means and said output means are a supplied common local frequency.
Claim 8
Dependent Claim
163 words
(8) A unique word detection system for a digital communication system employing a multiphase or multilevel modulation system comprising; a plurality of first conversion means for converting a plurality of baseband data, which are demodulated by a multiphase or multilevel demodulator, to a plurality of binary phase modulated IF band signals, a plurality of acoustic surface wave matched filters each having a piezoelectric substrate, a first interdigital electrode disposed on said substrate, and a second interdigital electrode disposed on said substrate wherein a pattern of said second interdigital electrode is determined depending upon a unique word to be detected, each of said acoustic surface wave matched filter being coupled with related first conversion means, an arithmetic means coupled with output of said acoustic surface wave matched filters for performing linear operation of outputs of said filters in the IF band, means for recognizing a unique word coupled with said an arithmetic means when output level of said arithmetic means exceeds a predetermined value.
Claim 9
Dependent Claim
80 words
(9) A unique word detection system according to claim 8, wherein a plurality of second conversion means are coupled with outputs of said filters in order to coherently detect outputs of said filters to provide baseband signals, said arithmetic means performs linear operation for said baseband signals, and said means for recognizing a unique word recognizes a unique word and the received phase in the demodulator when absolute value of level of said output arithmetic means exceeds a predetermined value.