Welcome to Tech class session. Speaker is the essential thing for the sound output for any device whether it can be taking a call in loud speaker mode or enjoying music/movie.
So in this tech class, we are going to learn about this Speaker thing.
What is a Speaker?
Speaker is an electroacoustic transducer which converts an electrical audio signal into a corresponding sound. Speaker takes an electric signal and converts it back into physical vibrations, which create sound waves. If everything works just like it should, the speaker produces the vibrations close to those in microphone that produced the electric signal.
In short, a loudspeaker is an item that is used to create the sound in radio, TV, Mobile Devices, and any sound output systems.
How does it work?
Mainly a speaker consist of the following parts:
When there is no electrical current applied to the coil, it's just hold in place by the diaphragm and the spider. When an electrical current is applied the coil becomes an electromagnet, and inside the constant magnetic field of the permanent magnet it moves up or down, depending on the polarity of the applied current. The positive end of electromagnet is attracted to the negative pole of the permanent magnetic field, and its negative end is repelled by negative pole. When the polar orientation of the electromagnet switches, the direction of attraction and repulsion changes too. This moves the coil, which moves the diaphragm and creates physical vibrations causing sound waves to be formed. What the speaker drivers do is constantly changing the polarity of electromagnet.
You can experience it from the below gif
Types of Speakers
The mostly used type of speakers are : Full-range drivers, Subwoofer, Woofer, Midrange driver, Tweeter, Coaxial drivers, Horn loudspeakers.
1. Full Range Drivers: A full-range driver is a speaker designed to be used alone to reproduce an audio channel without the help of other drivers, and therefore must cover the entire audio frequency range. These drivers are small, typically 3 to 8 inches in diameter to permit the reasonable high-frequency response, and carefully designed to give low-distortion output at low frequencies, though with reduced maximum output level.
2.Subwoofer : A subwoofer is a woofer driver used only for the lowest-pitched part of the audio spectrum: typically below 200 Hz for consumer systems, below 100 Hz for professional live sound, and below 80 Hz in THX-approved systems. Because of propagation delay, their output may be somewhat out of phase from another subwoofer (on another channel) or slightly out of phase with the rest of the sound. Consequently, a subwoofer's power amp often has a phase-delay adjustment which may improve performance of the system as a whole at subwoofer frequencies
3.Woofer : Woofer is a driver that also reproduces low frequencies. The driver works with the characteristics of the enclosure to produce suitable low frequencies
4. Midrange driver: A mid-range speaker is a loudspeaker driver that reproduces a band of frequencies generally between 1–6 kHz, otherwise known as the 'mid' frequencies -between the woofer and tweeter.
5.Tweeter: A tweeter is a high-frequency driver that reproduces the highest frequencies in a speaker system
6.Coaxial Drivers: Coaxial driver is a loudspeaker driver with two or several combined concentric drivers.
7.Horn Loudspeaker: Horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element.
8. Smartphone Speakers/Device Speakers: Mobile speakers are very small to be fit into a thin casing and even in a small sized device also. This speakers can play very loud, but the sound quality in mobile speakers can never be the same as in standard size speakers. Smaller speakers are more suitable for playing high-frequency sounds. So it's just your feeling that they are loud - because of the amount of high-frequency sounds coming out from them.
Speakers can be of different sizes and shape to suite your need. But it need to be more durable to take all kind of sounds.Nowadays mobile manufacturers are building the speakers of a higher quality and also to better fit the devices. Xiaomi is now using MEMS speakers in its smartphones. This allows them to minimize the thickness of the final devices, but produces a significantly better sound quality than standard small-sized electrodynamic speakers do.
Credits: Google, Wikipedia, & other blogs.
Previous Tech Class Lessons
Chapter 1: Introduction to Smartphone Specifications
Chapter 3: All You Need To Know About Augmented Reality
Chapter 4: All You Need To Know About Charging Cycle
Chapter 5: All About Activity Tracker & Fitness Band
Chapter 6: Internet of Things & Mi Home
Chapter 7: Infrared Blaster
Chapter 8: CPU Architecture, CPU, GPU
Chapter 9: Megapixels and Photo Quality
Chapter 10: PDAF and its difference with CDAF
Chapter 11: All About Network Bands
Chapter 12: All About Rooting
Chapter 13: All about Kernel
Chapter 14: All you need to know about Wi-Fi!Chapter 15: All About CPU Cores
Chapter 16: All About TWRP
Chapter 17: All About RAM
Chapter 18: All About Memory Cards
Chapter 19: All About Data Cables
Chapter 20: All About Batteries
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