¿Qué Son los Decibeles? Que no te Engañen

Los Decibeles: Unidades de Medida del Ruido, o de la Mentira Comercial

El concepto decibeles nos lo encontramos cada vez que buscamos las características de una Alarma. Unidad que se abrevia como dB. Aunque intuimos el significado de esa medida del ruido, muchas veces desconocemos realmente que significa. Esta falta de conocimiento, la utilizan muchos proveedores para confundir al consumidor.  En este mercado de la seguridad hay vendedores irresponsables que dicen abastecer sistemas con sirenas, por ejemplo,  de 120 dB. Cuando en realidad esa potencia apenas y alcanza los 80 dB. Lo anterior lo hemos comprobado técnicamente. Hemos comprado sus sistemas y los hemos puesto a prueba.  Para ello utilizamos una aplicación llamada decibelómetro.

decibeles: mentira
Esta sirena la anuncian como de 125 dB. La verdad con trabajos llega a 110 dB

Lo que es difícil de medir es la intención de esos proveedores, que puede ser por malicia o ignorancia. En el papel todos podemos mentir. Pero al final de cuentas, es el consumidor quien termina pagando por sistemas que no satisfacen su necesidad de seguridad.

Vamos a tratar de despejar la duda.

El decibel es la medida utilizada para expresar el nivel de potencia y el nivel de intensidad del ruido.  El decibelio es una unidad relativa que, para las aplicaciones acústicas se asigna el valor de 0 dB al umbral de audición del ser humano. Aun así, el verdadero umbral de audición varía entre distintas personas y para una misma persona. Se considera el umbral del dolor para el humano a partir de los 140 dB. Esta suele ser, aproximadamente, la medida máxima considerada en aplicaciones de acústica.

decibeles tablaComo puede apreciarse en la gráfica, un ruido empieza a ser irritante a los 80 dB (P.E. un tren de carga o un camión pesado a 15 metros).

A los 130 dB es ya doloroso (despegue de un avión a reacción a unos 60 m, discoteca, bocina de un automóvil a un metro).

El “umbral de audición” representa la cantidad mínima de sonido o  vibraciones por segundo  requeridas para ser percibidas por el oído humano.

Es importante señalar, que los decibeles se definen a 1 Mt de distancia de la fuente del ruido al  oído de quien lo percibe.

Sonido de las alarmas: ¿Cuál es su límite de potencia?

En lo que se refiere a las alarmas, siempre necesitamos que el sonido sea lo más fuerte posible, para que todos, en el ambiente circundante, puedan escucharlas.

En SeguComp fabricamos potentes alarmas que producen un intenso ruido que va desde los 118 hasta los 127 dB. Nosotros sí podemos comprobar que la potencia de nuestras alarmas es real, y no sólo un truco para engañarte.

En ese aspecto, es importante señalar que los decibeles no se suman; por cada fuente que agreguemos de la misma potencia sólo sumamos 3 dB a la intensidad de las sirenas. Es decir, sólo por poner un ejemplo, si tenemos 2 fuentes de 120 dB no nos da 240 dB. Más bien tendríamos 123 dB en total. Porque se trata de unidades relativas. Sin embargo, los seudo-técnicos de la seguridad, aquellos que con la intención de vender sus productos,  te dicen que el resultado es de 240 dB. Si ves la tabla, podrás notar que 240 dB ni siquiera es imaginable. Sencillamente la explosión de la bomba atómica lanzada en Hiroshima durante la Segunda guerra mundial produjo 200 dB. Esa magnitud es imposible de alcanzar por unas simples sirenas.

decibeles: tabla2Esto es así porque no se trata de sumas, sino de logaritmos, que llevaría mucho espacio explicar aquí.

Nosotros, ni por una u otra razón; es decir, ni por querer engañarte ni por ignorancia,  te estafamos. La razón es bien simple, pero tiene que ver con la honestidad. Porque en SeguComp nos interesa tu seguridad. La potencia de nuestras alarmas está técnicamente calibrada. Sin trucos.

Te invitamos a conocer nuestros modelos de Alarmas Vecinales con intensidad media de ruido real. Solicita una demostración y aleja las dudas. Compra sobre seguro.

Cualquier duda, por favor ponte en contacto con nosotros.

Autor: Luis Montes

Especialista en Sistemas Electrónicos de Seguridad

54 opiniones en “¿Qué Son los Decibeles? Que no te Engañen”

    1. Hola, gracias por participar. Mira, es muy difícil establecer los límites máximos y mínimos de decibeles en las sirenas, ya que hay fabricantes de estos dispositivos en todo el mundo, y francamente no tenemos esa información. Cualquier otra duda quedamos a la orden

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