How Does Toyota Car Stereos Work?

I took apart a Toyota Corolla radio to see what's inside and how it works. I made a short video on the simplified way it works, of course new radios are more complex:


The radio I took apart was a single DIN, AM/FM/CD radio:



Radio lid removed:



The main motherboard has a number of main components that make up the radio, including the antenna input, the demodulator, tuner, equalizer, micro-controller, amplifier, communication bus controller, human interface input/output, power distribution and CD ROM input:



Here's an overall system diagram of how things are laid out and work inside the radio:



Here's a closer look at the radio tuner (digital) and the demodulator:



If you remember physics class, AM stands for amplitude modulation, and FM stands for frequency modulation. Basically the amplitude or frequency of the radio waves are varied in order to carry a signal, which the demodulator turns into a voltage audio signal:



This is the back of the human interface board, including the LCD driver and buttons:



Moving on to the CD drive, there's 3 motors, one to turn the CD, one to load the tray, and one to move the laser head along the radius of the disk:



Closer look at the laser head:



Here's an overview of how it works, essentially light is reflected back based on the information burned onto the disk. A photo sensor pics up this light and turns that into usable information:





The last piece to a stereo is its output in the form of sound. This is done by repeatedly moving a paper cone back and forth at high frequency. This creates pressure waves in the air which we hear as sound.

The paper cone is controlled by an electromagnet:



And that's pretty much the very basics of how a car stereo works!



- Enjoy

If you opt for a higher trim level on many new Toyota vehicles, you'll also see that you have access to Entune' Audio Plus. In addition to bringing you a heightened sound experience via a JBL® Audio system, you can also take advantage of Scout® GPS Link navigation by way of your smartphone, as well as the upgraded entertainment capabilities of SiriusXM® Satellite Radio and HD Radio® with traffic and weather updates.

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At the cutting edge of technology in the new Toyota lineup is the Entune' Premium Audio with Navigation and App Suite. In addition to featuring up to a 9-inch touchscreen, this infotainment package adds in a variety of other features, including:

The JBL® Premium Surround Sound audio system delivers a superior sound experience to all passengers, regardless of where they're seated. It also features unique GreenEdge' Technology, which uses lightweight materials and reduced electrical energy technology in order to help improve efficiency.

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• 24/7 Call Center
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It used to be the case that in order to charge your you would have to bring along your USB cords, which can easily get lost, tangled, or even damaged inside the car. The new Toyota lineup, however, is offered with a wireless smartphone charging station which lets you charge your Qi-compatible simply by placing it on a non-slip surface beneath the center console.

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• Cruising range
• Average speed
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