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636 Wire and Wireless Communication Applications Chap. 8 RF amplifier TV tuner Superheterodyne receiver IF amplifier (bandpass from 41 to 47 MHz) Envelope detector Composite video plus FM audio carrier (5-MHz bandwidth) Local oscillator Channel selector Video amplifier Contrast (video gain) V Horizontal sync + + Video (intensity) signal CRT bias Brightness (CRT bias) To TV display Sync separator circuit Horizontal oscillator, f h Horizontal hold (oscillator frequency) To horizontal deflection circuit Vertical sync Vertical oscillator, f v Vertical hold (oscillator frequency) To vertical deflection circuit IF amplifier sound carrier f if = 4.5 MHz FM detector FAudio amp Figure 8–32 Black-and-white TV receiver. Volume (audio gain) that the white level cannot be lower than (12.5 ; 2.5)% of the peak envelope level (see Table 8–12 and Fig. 8–31b). When this occurs, a buzz will be heard in the sound signal since the 4.5-MHz FM carrier is disappearing at a 60-Hz (field) rate during the white portion of the TV scene. The sync separator circuit consists of a lossy integrator to recover the (wide) vertical sync pulses and a lossy differentiator to recover the (narrow) horizontal
- Page 1270: Sec. 8-6 Link Budget Analysis 611 U
- Page 1274: Sec. 8-6 Link Budget Analysis 613 E
- Page 1278: Sec. 8-6 Link Budget Analysis 615 2
- Page 1282: Sec. 8-6 Link Budget Analysis 617 F
- Page 1286: Sec. 8-7 Fiber-Optic Systems 619 fi
- Page 1290: Sec. 8-8 Cellular Telephone Systems
- Page 1294: Sec. 8-8 Cellular Telephone Systems
- Page 1298: TABLE 8-10 1G MAJOR ANALOG FDMA CEL
- Page 1302: TABLE 8-11 2G MAJOR DIGITAL CELLULA
- Page 1306: Sec. 8-8 Cellular Telephone Systems
- Page 1310: Sec. 8-9 Television 631 Camera Targ
- Page 1314: Sec. 8-9 Television 633 The composi
- Page 1318: Sec. 8-9 Television 635 Composite b
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636<br />
Wire and Wireless Communication Applications Chap. 8<br />
RF<br />
amplifier<br />
TV tuner<br />
Superheterodyne receiver<br />
IF amplifier<br />
(bandpass from<br />
41 to 47 MHz)<br />
Envelope<br />
detector<br />
Composite video plus<br />
FM audio carrier<br />
(5-MHz bandwidth)<br />
Local<br />
oscillator<br />
Channel<br />
selector<br />
Video<br />
amplifier<br />
Contrast<br />
(video gain) V<br />
Horizontal sync<br />
+<br />
+<br />
<br />
Video (intensity) signal<br />
CRT bias<br />
Brightness<br />
(CRT bias)<br />
To TV display<br />
Sync<br />
separator<br />
circuit<br />
Horizontal<br />
oscillator, f h<br />
Horizontal hold<br />
(oscillator frequency)<br />
To horizontal<br />
deflection circuit<br />
Vertical sync<br />
Vertical<br />
oscillator, f v<br />
Vertical hold<br />
(oscillator frequency)<br />
To vertical<br />
deflection circuit<br />
IF amplifier<br />
sound carrier<br />
f if = 4.5 MHz<br />
FM<br />
detector<br />
FAudio<br />
amp<br />
Figure 8–32<br />
Black-and-white TV receiver.<br />
Volume<br />
(audio gain)<br />
that the white level cannot be lower than (12.5 ; 2.5)% of the peak envelope level (see<br />
Table 8–12 and Fig. 8–31b). When this occurs, a buzz will be heard in the sound signal<br />
since the 4.5-MHz FM carrier is disappearing at a 60-Hz (field) rate during the white<br />
portion of the TV scene. The sync separator circuit consists of a lossy integrator to recover<br />
the (wide) vertical sync pulses and a lossy differentiator to recover the (narrow) horizontal
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