How does your dog listen to radio?
In between studying Archeology in my cosmeticdentistryguide.co.uk/teethwhitening.html, I listened to the radio a lot, and then started watching movies on BBC iPlayer. This was when I discovered BBC Leeds on iPlayer and that its used for advertising by letting agents in Leeds too. When I turn the sound down, my cat paws the computer screen.
In contrast to most humans, dogs and cats can hear ultrasound frequency that resonates above the human frequency limit. With radio, signals or wavelengths in the air can be affected by attenuation where amplitude drops as the signal passes through a medium. This is because photons are absorbed and scatter. Similarly, with ultrasound the amplitude of the ultrasound beam reduces the signal. So where we humans are limited in the range of radio signals we may hear, dogs and cats are not as limited, which explains why they respond.
My fascination with radio started when I was a child because of the high pitched frequencies that made a lot of noise. I wondered what information was in the noise, and what my dog and cat heard that I could not. So many appliances, including radio, use digital signal processing now – cell phones, Wi-Fi and television. Are these ever designed with consideration for cats and dogs, or humans who are sensitive enough to hear ultrasound?