Practica 1 Electroacustica

 

Instituto Politécnico Nacional

Escuela Superior de Ingeniería Mecánica y Eléctrica

Ingeniería en Comunicaciones y Electrónica

ELECTROACUSTICA y TRANSDUCTORES (ACUSTICA II)

PRACTICA: PATRON DE CAPTACION Y SENSIBILIDAD DEL MICROFONO

NOMBRE

No.BOLETA

Mariscal Hernández Eduardo Javier

2019301876

GRUPO:7CM3

PORFA.DE LA CRUZ CARTAS XUNAXI GUADALUPE

FECHA DE ENTREGA: 6-03-2022

 

MATERIALES: - 2 cab cable les s cai caima mann-ca caim iman an - 1 micrófono - 1 osciloscopio - 2 cab cable les s de de osc oscil ilos osco copi pio o - 1 gene genera rado dor r de frec frecue uenc ncia ias s - 1 flexómetro - 1 altavoz - 1 sonómetro - Base Base para para micr micróf ófon ono o - Cable Cable cannon cannon-plu -plug(e g(esté stéreo reo o balan balancea ceado) do) TABLAS DE MEDICIONES

Frec.[Hz] Angulo gulo[° [°]] 0 45 90 135 180 225 270 315 Frec[Hz] Angulo[°] 0 45 90 135 135 180 180 225 225 270 315 315

32

64

125

250

500

S[d [dB B] 60.2 57.3 56.4

V[v [v]] 80 80 80 80

S[d [dB B] 62.6 64.7 63.2

V[v [v]] 80 80 80

S[d [dB B] 69.8 68.7 67.2

V[v [v]] 40 40 40

S[d [dB] B] 81.3 82.4 80.1

V[v [v]] 40 40 40

S[d [dB B] 91.3 91 .3 90.5

V[v [v]] 40 40 40

55.2 52.1 52.3 52.0 54.5

40 80 80 80 40

62.4 60.1 63.2 6 63 3.2 63.3

80 40 40 80 80

67.2 67.3 67.3 68.6 69.1

40 40 40 40 40

79.4 78.5 78.6 79 .5 80.2

40 40 40 40 40

88.9 88.9 88.9 87.1 89.3

40 40 40 40 40

1k

2k

4k

8k

16k

S[dB] 90.5 92.9 90.6 90 90.7 .7 84 84.3 .3

V[v] 31.2 28 28 39 39.2 .2 35 35.2 .2

S S[[dB] 94.3 94 .3 95 .1 88.3 88.3 91.3 91.3

V[v] 34 30.2 30 31.2 31.2 32.8 32.8

S S[[dB] 94.5 92.9 88.3 89.7 89.7 89.7 89.7

V[v] 33.6 33.2 29.6 30 30.4 .4 32

S S[[dB] 88.1 80.5 76.3 78 78.4 .4 61 61.2 .2

V[v] 30.4 31.6 34.8 29 29.2 .2 31 31.2 .2

S[ S[dB] 60.1 56.4 54.5 50 50.2 .2 50 50.3 .3

V[v] 23.6 26.4 25.2 29 29.2 .2 30

87 87.2 .2 87.3 86 86.1 .1

30 30 30

94.5 94.5 93.5 93.5 93.5

28.9 28.9 29.2 28.8 28.8

86.1 86.1 92. 92.9 92.8 92.8

29 29.2 .2 26 24 24.8 .8

79.4 79.4 76.5 86 86.7 .7

30 29.6 29 29.2 .2

56 56.5 .5 54.5 63 63.2 .2

27 27.6 .6 26 29 29.6 .6

Las mediciones de voltaje están en milivolts Converr mili volts a volts y a decibeles con la siguiente formula en hoja polar

NPS = 20 X Log Donde Vr= 1

V  Vr

 

Esta formula es para el patrón de captación para que no se confundan son 80 resultados con esta formula jejeje ejemplo:

0°NPS(32Hz) = 20 X Log

V  Vr

45°NPS(32Hz) = 20 X Log

90°NPS(32Hz) = 20 X Log

 

V  Vr V  Vr

135°NPS(32Hz) = 20 X Log

180°NPS(32Hz) = 20 X Log

V  Vr

 

225°NPS(32Hz) = 20 X Log

 

270°NPS(32Hz) = 20 X Log

V  Vr

 

315°NPS(32Hz) = 20 X Log

V  Vr V  Vr V  Vr

 

CALCULOS: FRECUENCIA 32Hz: 80

-

0°NPS(32Hz) = 20 X Log

-

45°NPS(32Hz) = 20 X Log

1

  =38.06

80 1

180°NPS(32Hz) = 20 X Log

80 1

=38.06

225°NPS(32Hz) = 20 X Log

=38.06

270°NPS(32Hz) = 20 X Log

=38.06

80 1

=38.06 -

90°NPS(32Hz) = 20 X Log

80 1

80 1

=38.06 -

40

135°NPS(32Hz) = 20 X Log

1

=32.04

40

315°NPS(32Hz) = 20 X Log

1

=32.04

FRECUENCIA 64Hz: 80

-

0°NPS(64Hz) = 20 X Log

-

45°NPS(64Hz) = 20 X Log

1

  =38.06

80 1

180°NPS(64Hz) = 20 X Log

40

=38.06

225°NPS(64Hz) = 20 X Log

=38.06

270°NPS(64Hz) = 20 X Log

1

=32.04

40 1

=32.04 -

90°NPS(64Hz) = 20 X Log

80 1

80 1

=38.06 -

135°NPS(64Hz) = 20 X Log =38.06

80 1

=38.06

315°NPS(64Hz) = 20 X Log

80 1

 

FRECUENCIA 125Hz: -

0°NPS(125Hz) = 20 X Log

40 1

  =32.04

180°NPS(125Hz) = 20 X Log

40 1

=32.04 40

-

45°NPS(125Hz) = 20 X Log

1

40

=32.04

225°NPS(125Hz) = 20 X Log

=32.04

270°NPS(125Hz) = 20 X Log

1

=32.04 -

90°NPS(125Hz) = 20 X Log

40 1

40 1

=32.04 -

135°NPS(125Hz)) = 20 X Log 135°NPS(125Hz =32.04

FRECUENCIA 250Hz:

40 1

=32.04

315°NPS(125Hz) 315°NPS(125Hz) = 20 X Log

40 1

 

-

0°NPS(250Hz) = 20 X Log

40 1

  =32.04

180°NPS(250Hz) = 20 X Log

40 1

=32.04 -

45°NPS(250Hz) = 20 X Log

40 1

=32.04

225°NPS(250Hz) = 20 X Log

=32.04

270°NPS(250Hz) = 20 X Log

40 1

=32.04 40

-

90°NPS(250Hz) = 20 X Log

1

40 1

=32.04 -

40

135°NPS(250Hz)) = 20 X Log 135°NPS(250Hz

1

=32.04

40

315°NPS(250Hz) = 20 X Log

1

=32.04

FRECUENCIA 500Hz: -

0°NPS(500Hz) = 20 X Log

40

=32.04 -

45°NPS(500Hz) = 20 X Log

1

  =32.04

40 1

180°NPS(500Hz) = 20 X Log

=32.04

225°NPS(500Hz) = 20 X Log

=32.04

270°NPS(500Hz) = 20 X Log

40 1

40 1

=32.04 -

90°NPS(500Hz) = 20 X Log

40 1

40 1

=32.04 -

135°NPS(500Hz)) = 20 X Log 135°NPS(500Hz =32.04

40 1

=32.04

315°NPS(500Hz) = 20 X Log

40 1

 

FRECUENCIA 1KHz: -

0°NPS(1kHz) = 20 X Log

31.2 1

  =29.88

180°NPS(1kHz) = 20 X Log

35.2 1

=30.93 -

45°NPS(1kHz)) = 20 X Log 45°NPS(1kHz

28 =28.94 1

225°NPS(1kHz) = 20 X Log

30 1

=29.54 -

90°NPS(1kHz)) = 20 X Log 90°NPS(1kHz

28 1

=28.94

270°NPS(1kHz) = 20 X Log

30 1

=29.54 -

135°NPS(1kHz)) = 20 X Log 135°NPS(1kHz

39.2 1

=31.86

315°NPS(1kHz) 315°NPS(1kHz) = 20 X Log

30 1

=29.54

FRECUENCIA 2KHz: -

0°NPS(2kHz) = 20 X Log

34  1

=30.62

180°NPS(2kHz) = 20 X Log

32.8 =30.31 1

 

-

45°NPS(2kHz)) = 20 X Log 45°NPS(2kHz

30.2 1

=29.60

225°NPS(2kHz) = 20 X Log

28.9 1

=29.21 -

90°NPS(2kHz)) = 20 X Log 90°NPS(2kHz

30 1

=29.54

29.2

270°NPS(2kHz) = 20 X Log

1

=29.30 31.2

-

135°NPS(2kHz)) = 20 X Log 135°NPS(2kHz

28.8

=29.88

1

315°NPS(2kHz) 315°NPS(2kHz) = 20 X Log

1

=29.18

FRECUENCIA 4KHz: 33.6

-

0°NPS(4kHz) = 20 X Log

-

45°NPS(4kHz)) = 20 X Log 45°NPS(4kHz

1

  =30.52

33.2 1

180°NPS(4kHz) = 20 X Log

32

=30.42

225°NPS(4kHz) 225°NPS(4kHz) = 20 X Log

=29.42

270°NPS(4kHz) 270°NPS(4kHz) = 20 X Log

=30.10

1

29.2 1

=29.30 -

90°NPS(4kHz)) = 20 X Log 90°NPS(4kHz

29.6 1

26 1

=28.29 -

135°NPS(4kHz)) = 20 X Log 135°NPS(4kHz =27.88

30.4 1

=29.65

315°NPS(4kHz) 315°NPS(4kHz) = 20 X Log

24.8 1

 

FRECUENCIA 8KHz: -

0°NPS(8kHz) = 20 X Log

30.4 1

  =29.65

180°NPS(8kHz) = 20 X Log

31.2 1

=29.88 -

45°NPS(8kHz)) = 20 X Log 45°NPS(8kHz

31.6 =29.99 1

225°NPS(8kHz) 225°NPS(8kHz) = 20 X Log

30 1

=29.54 -

90°NPS(8kHz)) = 20 X Log 90°NPS(8kHz

34.8 1

=30.83

270°NPS(8kHz) = 20 X Log

29.6 1

=29.42 -

135°NPS(8kHz)) = 20 X Log 135°NPS(8kHz =29.30

FRECUENCIA 16KHz:

29.2 1

=29.30

315°NPS(8kHz) 315°NPS(8kHz) = 20 X Log

29.2 1

 

-

0°NPS(16kHz)) = 20 X Log 0°NPS(16kHz

23.6 1

  =27.45

180°NPS(16kHz) 180°NPS(16kHz) = 20 X Log

30 1

=29.54 -

45°NPS(16kHz)) = 20 X Log 45°NPS(16kHz

26.4 1

=28.43

225°NPS(16kHz) 225°NPS(16kHz) = 20 X Log

27.6 1

=28.18 25.2

-

90°NPS(16kHz)) = 20 X Log 90°NPS(16kHz

26

=28.02

1

270°NPS(16kHz) 270°NPS(16kHz) = 20 X Log

1

=28.29 -

135°NPS(16kHz) 135°NPS(16kH z) = 20 X Log

29.2 1

=29.30

315°NPS(16kHz) 315°NPS(16kHz) = 20 X Log

29.6 1

=29.42

Para la sensibilidad del micrófono hacer la media de los resultados y solo obtener uno solo de las frecuencias 32 64 125 250 500 hz 1 2 4 8 16 KH KHzz

Frecuencia 32 Hz 64 Hz 125 Hz 250 Hz 500 Hz 1K 2K 4K 8K 16K

Media 36.55 36.55 32.04 32.04 32.04 29.89 29.71 29.44 29.73 28.57

 

 

Dónde: Pr=20x10 -6 Pa

Revisen si esta bien el despeje para la p y si no pongan el correcto

*SI ESTA BIEN DESPEGADO P*

Y después ocupar la fórmula de la sensibilidad para la gráca hoja milimétrica

S=

V   P

 

CONCLUSIONES BIBLIOGRAFIA REFERENCIAS