Question

Q. 3. Write short notes on :
(1) Estimation of number of people :
(2) Signalling with the help of sound :​

Answer 1

Answer:

1. Crowd counting or crowd estimating is a technique used to count or estimate the number of people in a crowd. The most direct method is to actually count each person in the crowd. For example, turnstiles are often used to precisely count the number of people entering an event.

2. Audio signals have frequencies in the audio frequency range of roughly 20 to 20,000 Hz, which corresponds to the lower and upper limits of human hearing. ... Loudspeakers or headphones convert an electrical audio signal back into sound. Digital audio systems represent audio signals in a variety of digital formats.

Answer 2

irrational

irrational

irrational