通信処理 ppt
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- さや こびき
- 7 years ago
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1 PCM TDM 5. Q 28726?2?
2 AM VsSinωst t ωs ω VcSinωct t ωc ω t ωc-ωs ωc+ωs Vc(1+mSinωst)Sinωct ωc ω SinωsSinωc=-1/2Cos(ωs+ωc)+1/2Cos(ωs-ωc) " " " " AM(DSB,SSB)/FM/PM FDM" 1R" " " " 2PCM" " TDM" R" " "
3 " Pulse Code Modulation: PCM " " 2" PCM" " " PCM PCM() (PAM) (PCM)
4 Step1: PAM ωmωs/ ωm ωs Step2: PAM (PAM) t t
5 p N Q y i = y i + y i +1 : (s = y 2 i+1 y i ) iyii n y N Q = p i {y (y i + s i + s y i =1 2 )}2 dy = i p s3 i i =1 12 = s2 12 V 2 s = V N Q = n 2n NqdB n s s s p111 [bps] [Hz] [bit]
6 AD" n n n bita n,a n-1,+a 2,a 1 " inpamn inv 0 (a n 2 n-1 +a n-1 2 n-2 ++a a 1 +ε) in V 0 2 n-1 V 0 " in >V 0 2 n-1 a n 1,< in V 0 (a n 2 n-1 +2 n-2 a n-1 1,<" n a n,a n-1,+a 2,a 1 nor0 ADPAM f02f0 τ Vin t PCM PAM AD
7 Step3: 2" bit " 2! bit
8 PCM 2 23 S5 S4 S3 S2 S b3,b2,b1 b3b2b S5 S4 S3 S2 S1
9 LSI PCM LSI 3R CRC
10 PCM WAV PCM bit- rate khz khz 1/2f0=1/6.8kHz khz bit kbit/s Full Speck (CCITT 3.1kHz 64kbit/s
11 2kHzCD khz-16bit" CD20kHz" 1/2f0=1/40kHz44.1kHz" bit" 2ch Mbit/s" MD:1624bit" ADPCM(PCM)" 292kbit/s" PCM/ <khz PAM 256 =2 8 8bit Sampling Pules >8kHz PCM [kbit] 8[bit] 8 [khz] =64 [k bit /s] 176.8[kbit]
12 kbps ( " " "
13 NTSC(Na$onal Television System Commi2ee) " 2012"
14 VHF(30-300MHz,FM1-12ch)" UHF(300M-3GHz,13-62ch)" UHF" +EU8 6MHz( MHz13-62ch)" " " " 121" " 4 7 PCM JPEG(,MPEG
15 (1) RGBYCbCr (2) DCT (3) " "
16 MPEG(Moving Picture Experts Group)}" MPEG1 NTSC Mbit/s" MPEG NTSCMbit/sHDTVMbit/s" " (MPEG1or4 Layer3:" MPEG2
17 16bit44.1kHz 16sampling 2Byte 161=(16*16+16)=272bit 144.1k/16== , bit 12,698,920,000bit= MByte kByte 674.7MByte 10.1kHz~10kHz-70dB -2V~2V 23 S1 S2 S3 S4 S5 b1b2b S1 S2 S3 S4 S5 b1b2b
18 α C(bit/s)=W(Hz)log2(1+S/N) C S WN S/N " "
19 P b b b b b b b a b c d f BCC b 1 b4 1 db410 2
20 CRC Mr CRC (b8b7bb6b5b4b3b2b1)( ) module2 (b8b7bb6b5b4b3b2b1)( ) 8CRC bit (7bit MRCRC r=r-1
21 bit CRC(Cyclic Redundancy Check cord) CRC= (17bit) F(x) 0 OK0: PCM (0)
P15 P211 1 P1 P4 P2 P3 P4 P17
P15 P211 1 P1 P4 P2 P3 P4 P17 P3 P4 P7 P8 P9 2 1 Q A P17 P17 1 2 3 4 3 5 6 7 8 2 P17 Q A P17 4 1 2 3 4 2 P17 P4 P12 P17 P4 5 5 6 7 8 2 P4 P4 6 1 2 3 4 3 P17 P10 P17 7 5 6 7 8 4 0120-096-991 P17 8 1 2 3
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