Creative Thinking
& # 8211 ; Car Audio Normalizer Essay, Research Paper
Undertaking Description and Overview
My proposal for this undertaking is a auto audio normaliser. This device would be packaged as a micro chip with assorted input and end product pins. The grounds for this device have been experienced by about everyone with a auto sound system of any type.
Weather you own a simple mill made auto wireless or an expensive usage sound apparatus, an unsought affect occurs. A coveted sound volume is set on the system at some point in clip. The job is that the environmental sound degrees about ne’er stay changeless. Typically, an unfastened window, a passing vehicle such as a semi truck, or an addition in engine noise, drowns the sound out. When you manually adjust the sound degree back to an hearable one, the loud noise may frequently vanish. The truck passes, or you slow your vehicle, or near your window. After which, the volume degree is unwantedly high.
My proposed system would be activated when the wireless was turned on. Each clip the volume is adjusted, the system uses a mike to try the environmental audio degree and cipher a ratio between the environmental audio degree and the audio system volume. Then, utilizing the mike to try the environment, the system maintains this ratio by seting the audio system volume.
History
The engineering that precedes this device is the heritage of auto audio systems. Car sound rose to popularity in the 1950 s when auto radios we widely seen in new autos. The first systems that allowed users to play their ain music in a auto was an eight path system. This was followed by the popularity of the cassette deck in the 1980 s. All these systems are linear, take parallel media, and have analog controls, hence they do non impart themselves to a digital normaliser, which I am suggesting.
Modern systems, nevertheless, are digital, have digital volume controls, and take digital media. Therefore, a digital normaliser could be used as a constituent in these systems and would set the volume digitally.
There are several similar merchandise patented and possible implemented and on the market. Patent figure US5414386 is a muting setup for a auto sound system. Patent figure US5758272 is a patent on a addition commanding system, but it normalizes FM wireless signals. There were several in writing equalisers patented, an illustration being patent figure USD0310369. There is besides a merchandise on the market that raises the audio system volume in relation to the vehicle s engi
ne revolutions per minute s. There are self tuning Dolby Digital 5.1 systems available. A environment sound degree controlled system would be a great add-on to an already powerful armory of auto audio equipment.
Technical Information and Implementation
The system I have described above would be implemented a micro chip and perceivable sold to auto audio constituent makers. This bit would hold several inputs and end products that the makers would hold to account for in their system design. The device would include a low base on balls filter, a mike input, a DAC, and VLSI circuitry. The block diagram is shown below.
There are several relevant inside informations about the internal circuitry. The first is a low base on balls filter. This device will do merely low frequence signals to be received from the mike. This will do motor sounds, go throughing vehicle sounds, blowing air current, and the lick to impact the system, but human voices and other high frequence signals will be filter out by the system. In this manner human communicating does non number as an environmental sound. Humans will be able to speak over the wireless, or sing along with it, without holding the volume degree rise unwantedly.
Another characteristic is the manner in which the end product volume is adjusted. There will be a scene from system input, that will find how rapidly the volume goes to the new degree which maintains the ration of environmental noise to system volume degree. Since it is undetermined conditions users would prefer the system to instantly to the new volume degree, or bit by bit adjust the volume. The statement for immediate is that loud distractions may be really impermanent and they may be about over before the system perceptibly adjusts. The statement for gradual accommodation is that a fast volume alteration may be more deflecting than good. Again, because the ambiguity, I have chosen to do this a user puting through the sound system.
Decision
Environmental audio degree alterations have long been an raging drawback to listening to auto sound. The solution does non lie in altering the environmental sound degrees, but in altering the auto s sound system s volume degree to fit the alteration in environmental noise. I propose a device that uses a mike and current volume degree input to normalise to a ratio of audio degree to environmental noise. This would be packaged as a micro chip and sold to auto audio constituent industries. It would filtrate out human address and be configurable to rapidly or decelerate modulate the end product volume degree.
