Transforming Google Home Mini into Three-Way Tabletop Acoustics
Vetyugov, Arthur (2024)
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2024052314980
https://urn.fi/URN:NBN:fi:amk-2024052314980
Tiivistelmä
Modern speaker systems have much wider functionality than their predecessors. With the advent of smart technologies, loudspeakers have become even more technically complex, but have lost a variety of form factors on markets. This thesis project was aimed at studying the principles of operation of smart speakers and modifying one of the most affordable devices of this kind for expanding its acoustic capabilities.
The smart speaker used for modification was a Google Home Mini. Its circuit board was used as a device control unit as well as an input signal preamplifier. The output dedicated to a stock speaker was used as an input for an additional board. The board was an audio signal conversion circuit containing a half-bridge class D amplifier based on MOSFETs for amplifying, and a crossover built on analog filters for distributing the main flow into three components.
Each of the frequency components was responsible for the dedicated range – low, medium, and high. Those ranges were split according to cutoff frequencies chosen to be 800 Hz and 3000 Hz. Each of the three resulting signals was sent to the speaker driver intended for it – tweeter, midrange, woofer correspondingly.
The system was integrated into passive three-way speaker JVC SP-C330. Crossover filters were designed considering impedances and power handling capabilities of speaker drivers. The system was thoroughly tested in accordance with common practices, and the functionality and performance were confirmed empirically. The result was unpleasant, as the system did not work as intended.
The smart speaker used for modification was a Google Home Mini. Its circuit board was used as a device control unit as well as an input signal preamplifier. The output dedicated to a stock speaker was used as an input for an additional board. The board was an audio signal conversion circuit containing a half-bridge class D amplifier based on MOSFETs for amplifying, and a crossover built on analog filters for distributing the main flow into three components.
Each of the frequency components was responsible for the dedicated range – low, medium, and high. Those ranges were split according to cutoff frequencies chosen to be 800 Hz and 3000 Hz. Each of the three resulting signals was sent to the speaker driver intended for it – tweeter, midrange, woofer correspondingly.
The system was integrated into passive three-way speaker JVC SP-C330. Crossover filters were designed considering impedances and power handling capabilities of speaker drivers. The system was thoroughly tested in accordance with common practices, and the functionality and performance were confirmed empirically. The result was unpleasant, as the system did not work as intended.