phonewiththecaronecanalsocontroltheACtemperatureinthecarbysittingathome,
making the car comfortable for travel.
Nowadayscarsarealsoinstalledwithactivenoisecontrol,enginenoiseisundesirabletofew
peoplewiththehelpofactivenoisecontrolassoonasthecarcrossesasspecificspeed(engine
noiseincrease)automaticallythesoundoftheaudiosystemincreaseshencehidingtheengine
noiseforthosesittinginthecabin.Thesamespeakerscanalsobeusedtoamplifytheengine
noise mainly in sports cars. Now let us talk a littleabout the history of audio systems.
History,
Asthehistoryofothercarparts,thehistoryofcaraudioisalsoaninterestingone.Waybefore
theinventionofsuitabletechnologyfortheradiothefatheroftheradioLeeDeForestdida
smalldemonstration onthe caraudio system.Itwasinthe 1920swhenthevacuumtube
technologywasintroducedthathelpedinreceivingtheradiosignalsforradiotowork.Butthe
difficultiesthatwerefacedwasthatitworkedonahighvoltageDCsupplyascomparedtothat
ofthecarbatteriesduetowhichadevicenamedvibratorwasusedtoamplifythecarbattery
voltage.Itwasin 1924 whenthefirstcarwiththeinstalledcarradiocameinthemarket.During
thistimeacompanynamedMotorolaintroduceda130$radioreceiverinthemarketthatwas
veryexpensive.InGermanymediumandlongwaveradiosweremarketedthatwereofonethird
thecarprice.Theradiosoccupiedmuchofthecarspaceandthuswerenotinstalledneartothe
driverandthushadtobeoperatedwiththehelpoftheremotecontrolpresentonthesteering
wheel.