Nt1310 Unit 6 Lab Report

Throughout Canada, increasing use is being made of award winning Echo Sound Barriers to counteract noise pollution. As companies become aware of the advantages of the range of noise reduction solutions available from the Echo Barrier company, the impact of noise on the environment in Canada is reducing. This can only be an advantage to the health and welfare of the nation. Unacceptable levels of sound can come from many sources. Construction and building work, demolition sites, generators, airports and railways and even children playing in the garden can make life unbearable for those who live or work in close proximity.

Frequency (Hz) Mean (dB) Median (dB) Range (dB) Normal ear 500 1000 2000 4000 5.85± 0.14 7.42± 0.12 9.50± 0.1 10.71± 0.09

Aerodynamic analysis of voice includes static measures of respiration and dynamic measures of laryngeal valving. The static measures help in understanding the volumes of air that can be inhaled / exhaled in a breath and maximum capacities of an individual’s respiratory system. The dynamic measures provide information about the efficiency of laryngeal valving in converting the expiratory airstream to acoustic energy. Dynamic measures that aid in assessing efficiency of laryngeal valving comprise majorly of the measures of pressure variations at the level of glottis and airflow through the glottis during phonation.

So we can reduce that damping by using frictionless strings. We must stop the effect of wind in this practical. So we have to fix this apparatus into a glass box and make that box as a airless box. We must use less weight springs for this practical to avoid errors in calculations because this mass can change the final value. We haven't enough time to observe the correct value of amplitude.

Contrarily to bottle C, Bottle A had the longest wavelength and smallest frequency because there was a seventeen-centimeter air column for the waves to reflect back and forth. Secondly, the

Then, the cuvette that labeled #1 was wiped off with the KimWipe and placed in the single cuvette holder in position 1 in the sample compartment. The position 1 was making sure aligned with the light source. The sample compartment door was closed, and was pressed “auto zero” button on the keypad. Then, after 30 seconds, the absorbance that displayed on the screen was read again and it was 0. The absorbance was read at 0 seconds, at 30 seconds, at 60 seconds, at 90 seconds and at 120 seconds.

Open-open had .647m and the open-closed had .630m of distance. The tube with the least percent error and closest to the actual speed of sound was the open-open tube with a frequency of 512

THE EFFECT OF THE SOUNDPOST ON VIOLIN SOUND The sound output and the response of a violin were measured for three positions of the soundpost: no soundpost, inside and outside the treble foot of the bridge. The sound quality was assessed with Long Time Average Spectra that showed small differences. There were significant differences in the response plots, whether measured by a microphone in front of the top or a magnet/coil pickup on the bridge.

The final acoustic attribute that defines the sine-wave tone is its starting phase. Thit does not mean that this phase is not encoded by the auditory system. As phase differences between the sounds reaching each ear result in differences in perceived location of the sound source. The two sounds differ in frequency, with the sound cycling between periods of higher and lower air pressure at a lower rate, or frequency. These physical properties influence how it is displaced by sound; higher frequencies vibrate the stiffer base to a greater extent than do lower frequencies, creating a place code along the basilar membrane such that different locations are maximally displaced by different sound frequencies.

After changing the distance of alsthesiometer on 7cm, 0.5cm, 1cm and 1.5cm new trials were carried out. And readings were carried out. In next step the percentages of 1 and 2 point threshold were calculated on longitudinal position In the last step the percentages of 1 and 2 point threshold were calculated on lateral positions. To determine whether the hypothesis has been

The location of the largest vibration in the basilar membrane depends on the frequency of the travelling wave (Fig 1E). Width, thickness, and stiffness of the basilar membrane vary along the length of the cochlear spiral [2]. Due to this variation in impedance (mechanical), high frequency sounds amplify the motion of the basilar membrane near the base of the cochlea, whereas low frequency sounds amplify its motion near the apex (Fig 1E)

For individual representation of the harmonics of male speech, a frequency resolution less than the minimum expected f0 for males approximately 50 Hz is required. Consequently, there is a direct trade off to be considered between frequency and time resolution and this can be controlled by altering the bandwidth of the spectrograph’s analysis filter. Usually, this is indicated as wide or narrow based on the relation between the filter’s bandwidth and the f0 of the speech being

Dylan Garofalo Dylan Garofalo's Research Report How do different notes on different instruments effect the vibration of said instrument? Over the past month or so I, Dylan Garofalo, have been researching anything and everything that has to do with an instrument and how it works. The subjects that are connecting to my problem are such things as vibration, sound waves, frequency, and how all of these subjects connect to create the sound that is emitted from mostly any instrument. To find the intriguing answer to my problem statement I will use a device known as an oscilloscope to find out how large or how small of a sound wave is emitted from each instrument that I have availability over.

The treatment of such typical rooms where of perforated plates of wood with a mineral behind it, or with drilled holes into cellotex. Mostly these absorbers would only treat the mid high frequencies and high frequencies. And most documentation of that time showed that low frequencies where basically untreated as they were almost impossible to measure (Voetmann 2007). The equipment just was not invented at that time and more or less just was not thought

Timbre is the sound quality which differentiates musical notes of identical pitch, loudness and duration played by different instruments. Instruments have their own acoustic properties which generate the differences in listeners’ perceived timbres, and the key to it is the spectral and temporal features of the sound. In the aspect of spectra, most instruments generate harmonic resonances in which they produce energy at multiple numbers of fundamental frequency. These harmonic resonances are very similar to the speech produced by the vibration of vocal chords. Just like the varied vowels, the differed energy patterns across different harmonics determine distinct instrument properties.