When you say ‘house’ do you mean the realworld reverberation times of each room/one room, or the theoretical total reverb time of your entire house? The answers also depend on whether you need a mathematical algorithm for recreating the realworld room, or a system for capturing the rooms’ reverb. If it is the former, you first need a measuring tape. Then you should search for ‘Sabine’s formula’, which states that:
Tr = (Kv)/Se
where ‘Tr’ is total reverb time, ‘v’ is the volume of the room in meters cubed, ‘Se’ is the effective absorbtion area (m2) and ‘K’ is a constant (0.16). ‘Se’ itself is dependent on a number of factors, which can easily be determined if you search for ‘absorbtion coefficient’.
OK, I think I understand; by ‘calculate’ you mean ‘capture’, like an impulse response? Sending a short burst of noise into the room via loudspeaker and then capturing the reverberations? Most sources recommend using a 0db burst of white noise for the duration of 1 sample.
The practical application of this is beyond me I’m afraid, but here’s an article I found via google, on convolution reverb, which may or may not help:
i think that could be possible calculate the Tr using a source with pink noise and 100 dB. when the source stop send a bang to a clock and when the level decrease 60dB send another bang and stimate the time between the 2 bangs.