ГОСТ 18670-84 Фильтры пьезоэлектрические и электромеханические. Термины и определения

Acoustic absorber

27

Aperture of transducer

24

Apodised transducer

23

Attenuation characteristic

48

Attenuation characteristic pole

79

Band-pass filter

15

Band-stop filter

17

Bulk wave signal

97

Comb filter

16, 19

Cut-off frequency

62

Discriminator

18

Discriminator operating bandwidth

91

Differential steepness of discriminator characteristic

93

Electromechanical filter

2

Feed through signal

98

Filter type

13

Frequency characteristic of phase shift

81

Group delay

85

Group delay distortion

87

Guaranteed attenuation

55

Hybrid piezoelectric filter

11

Input current

29

Input impedance

42

Input power

30

Input terminating resistance

44

Input terminating (load) impedance

40

Input voltage

28

Insertion attenuation

49

Insertion phase shift

80

Integrated piezoelectric filter

10

Interdigital transducer (IDT)

20

Low level of relative attenuation determining pass band (stop band)

57

Lower cut-off frequency (at -level)

63

Lower cut-off frequency (at -level)

65

Lower cut-off frequency of a stop band (of a pass band)

67

Lower pass (stop) bandwidth (at -level)

72

Maximum current

38

Maximum d. c. load

46

Maximum discriminator bandwidth

90

Maximum insertion attenuation within pass band

51

Maximum power

39

Maximum voltage

37

Mean steepness of discriminator characteristic

92

Microphone interference

47

Mid-band frequency of a pass band (stop band)

75

Minimum attenuation frequency

76

Minimum insertion attenuation within pass band

50

Monolithic piezoelectric filter

9

Multistrip coupler (MSC)

25

Nominal current

35

Nominal frequency

61

Nominal power

36

Nominal voltage

34

Non-linearity of amplitude-frequency characteristic of discriminator over the operating band

94

Non-symmetry of amplitude-frequency characteristic of discriminator

89

Non-symmetry of attenuation characteristic of a band-pass (band-stop) filter

86

Output current

32

Output impedance

43

Output power

33

Output terminating resistance

45

Output voltage

31

Output terminating impedance

41

Pass band

59

Pass-band ripple

53

Pass (stop) bandwidth

69

Pass (stop) bandwidth (at -level)

70

Pass (stop) bandwidth (at -level)

71

Piezoelectric ceramic filter

5

Piezoelectric crystal filter

4

Piezoelectric filter

1

Piezoelectric surface acoustic wave filter

12

Piezoelectric filter with discrete elements

7

Piezoelectric mechanical filter

6

Phase delay

84

Quartz filter

Rated level

3

Reflection coefficient

88

Relative attenuation

54

Ripple of phase schift characteristic

83

SAW reflector

26

Single-layer piezoelectric filter

8

Steepness of phase schift characteristic

82

Shape factor

74

Stop band

60

Surface acoustic wave coupling coefficient

95

Transducer attenuation

52

Transmission factor

78

Triple transit echo

96

Unwanted response attenuation within pass band (stop band)

56

Unwanted pass (stop) band

77

Upper cut-off frequency (at -levei)

64

Upper cut-off frequency (at -level)

66

Upper cut-off frequency of a stop band (of a pass band)

68

Upper level of relative attenuation determining pass band (stop band)

58

Upper pass (stop) bandwidth

(at -level)

73