HT8972

Rev. 1.00

5

December 23, 2008

L P F 1

A / D

D e l a y

D / A

L P F 2

Functional Description

The HT8972 is an echo/surround effect generator with

built-in 40Kb SRAM. It ensures low distortion as well as

low noise for processing audio signal delay. The chip

provides two playing modes (echo and surround) and

the playing function block diagrams are shown as fol-

lows.

56.2

44

36.3

30.6

25.9

23.1

20.7

k

W

2

2.5

3

3.5

4

4.5

5

MHz

Td

320

264

219

188

164

147

132

ms

THD

1.3

1.05

0.815

0.625

0.58

0.525

0.43

%

18.5

16.7

15.1

14.5

13.9

11.9

10.9

k

W

5.5

6

6.5

7

7.5

8

8.5

MHz

Td

120

110

102

93

88

82

78

ms

THD

0.4

0.335

0.315

0.3

0.275

0.26

0.25

%

10

9

8.06

7.3

6.4

5.8

5.3

k

W

9

10

11

121314

15

MHz

Td

73.2

65.6

59.2

54.4

50

46

44

ms

THD

0.23

0.218

0.205

0.19

0.17

0.1675

0.1575

%

4.8

4.4

4

3.7

3.3

3

2.8

k

W

16

17

18

19

20

21

22

MHz

Td

41.2

38.4

36

33.6

33

32

30

ms

THD

0.16

0.145

0.14

0.14

0.13

0.125

0.12

%

L P F 1

A / D

D e l a y

D / A

L P F 2