tầng khuyếch đại ghi trong máy ghi âm và các biện pháp nhằm nâng cao chất lượng của máy ghi âm

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Môc lôc
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Lêi nãi ®Çu
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PhÇn II-#

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Lắp ráp một máy ghi âm (phần đọc)
Tình hình phát sóng tại địa phơng? Thuận lợi và khó khăn ?
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Một lời cảm ơn chân thành em xin đồng kính gửi tất cả!
H Nội, tháng 3 năm 2009
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Nguyễn Thị Thủy
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Phần I
Lý thuyết
Chơng I: Tổng quan về máy ghi âm
1.1. Khái niệm về ghi âm
1.1.1. Ghi và đọc lại âm thanh
-*4F3@-2134-S!;
c!;-53421J/-6[-4Bd-9eBd21
)f7!(S!82!V:3EBd-921)'J<-9!-<-9!

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341*-9NB?-)21*4(8?QF3@-7!(>
I/-6.2134417H/-6-R--7!S!;
21J3!-WN*-*47/-6-R--%21J
/-6[-47/-6-R@0N*->&'(7/-6-R
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1.1.2. Các phơng pháp ghi âm
1.1.2.1. Phơng pháp ghi âm cơ khí (phát minh năm 1870)
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jI-ND('-R072!%I534072!%I
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1i<!"6*4-72!;0Bd-921)_39/;A*K-0

72!'1i-!"6*4-72!;0Bd-921)?-
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H×nh 1.1: Ph¬ng ph¸p ghi c¾t ngang
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-8R*41pO>&0B4"1@8?\11>&D1p(JdDH(
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qc!;FD
4"".-BP[/-6A=!@3@-21-9AedF-
34)!S!"DG-A-8!f9-9*49-9l
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\121*D:!
Z!0B2"D
m TBYl
rk-1
tu-7T0
\-'-9
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rkpB-9
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JN)*47h@"NI%D3418-1B0eB0
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l,S!3u-7T0etf"[-*4@7!=-90?15N!0
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B2"eZf>&(34Bd21)-ND3@--A4"G(H-J
'-?175Gb38-1>
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2"8,;/4">yJ-'1%-'"(?"<J7:
BC>

1.1.2.2. Ghi ©m theo ph¬ng ph¸p quang häc
1-Q1\wwxBz-71-J7:BCN-9?8T
C;@-121>
!"T-21R;\m
(b-6!78,[-S!9HS!FO1=!
8<0-C.,RK-AJ?V@*4-S!108RkO-F-*4
-1?>
¸7-*4-1;-17h/$R {8,-*Y]>
A3T3R21*;*"-7]@"-@"3@-1G
-1341{7-+!{7<>
H×nh 1 - 3: Ph¬ng ph¸p ghi ©m quang häc
AJT*49H-H)!-A8-'!-9le;\rf>
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!8--+!67*4-1'8,/$7BC>
qc!;F
-1I-21@"S!10/(b7*4106/4S!
-9(7-S!-1>¸766/4S!-9J-+!6
21)N-1>;*"Bd-9l6/4S!-9<34Bd21
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m>&917!-W37T
r>7T
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1.1. Ghi ©m b»ng ph¬ng ph¸p tõ tÝnh
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-21A3/l
-21l<34ABPBP21)/-6[-4l
1@e)!l-f>k-/Ql3KS!3K/07T%/Q./Q/$l(*4
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   !"#$%"
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q-217H3/Ql
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1.2.2. S¬ ®å khèi m¸y ghi ©m khuyÕch ®¹i hçn hîp
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Hình 1- 8: Sơ đồ khối máy ghi âm khuyếch đại hỗn hợp
k-N60F.OO7h/$Te('1@217TK-
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1.2.3. Sơ đồ khối máy ghi âm stereo
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T11@C*41@8-'1>;*"((1-/0)!>
{-/0J=!*4101"e8f>1{-8(l)-+!_
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chỉnh
Hiệu
chỉnh
M
AX
U
AX
U
AX
U
P
1
P
2
K
3
R
a
K

1
K
2
G
Đ
K
2
Đ
MiC
AuX
Line
X
K Đại
hỗn hợp
K Đại
hỗn hợp
R

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Hình 1 - 9: Sơ đồ khối máy ghi âm Stereo đơn giản
!"#$%"
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MiC

P
R
P
R
P
R
P
R
KĐ
CS
KĐ
CS
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siêu âm
Dao động
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X
K Đại
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Hỗn hợp
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L
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G
G
G
Đ
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X
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G
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1.2.4. Sơ đồ khối máy ghi âm trên đĩa CD
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D.CDN2"-9/3Re;\\xf>
Hình 1 - 10: Ghi âm lên đĩa CD
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x.tm
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7h3R8<?V@.-$LxL(7h8,3R->
0!"'[-vy!"'<-9!3e3-3@f4<-9!
y--3>
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Đĩa gốc
Bộ điều
chế
ánh sáng
Bộ điều
chế
ánh sáng
Bộ Laze
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Bộ Laze
khí
Bộ chuyển đổi
A/D
Bộ chuyển đổi
A/D
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sinh
mã
con
Bộ
sinh
mã
con
Bộ
sinh
mã
con
Bộ
sinh
mã
con
Kính phản xạ
Thấu kính hội
tụ
Đĩa gốc
Mô tơ
Mô tơ
Máy tính
Máy tính
Kiểm tra vị trí truyền
cảm
Điều
khiển
tốc độ
Kiểm tra
hội tụ

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chơng ii: tầng khuyếch đại ghi trong máy ghi
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Hình 2 - 1: Các dạng mạch cơ bản của KDG
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2.2 - 2a. M¾c nèi tiÕp
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2.2 - 2b. M¾c song song
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H×nh 2 - 4a: M¹ch söa ®Æc tuyÕn K§G trong m¸y SHARP GF560
;Zr7:BCB@1@2(0N77N)7H
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Ch¬ng III
C¸c biÖn ph¸p nh»m n©ng cao chÊt lîng
cña m¸y ghi ©m
3.1. BiÖn ph¸p tù ®éng ®iÒu chØnh møc ghi
3.1.1. Môc ®Ých
k-<-9!-3/Ql.<-9!(B?-F"[-*;*"'?1
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