Digital signal processors use digital computations and analog inputs to generate analog outputs. They are found in electronic devices and sound cards, and enable technologies like speech and biometric recognition. Analog-to-digital converters and digital-to-analog converters are built into the processor. Applications include noise reduction and two-way digital signaling for interactive TV.
A digital signal processor is a special computer program that uses digital computations and possibly one or more analog inputs to generate required analog outputs. For example, a voice changer can accept normal voice from a microphone. This ordinary voice becomes a stream of digital bytes or words that can be digitally changed to produce a “different” voice.
This microprocessor is one of the reasons cell phones and other electronic devices are so reliable and produce crystal clear audio. It is also found in sound cards in personal computers (PCs) and laptops. The development of the digital signal processor promises new products that will change the way people live. Technology, such as speech recognition and biometric recognition, is made possible by digital signal processing systems.
Due to the superiority of digital signal processor and the decreasing cost of digital hardware, digital signal processing has become a powerful technology to create better products for entertainment and communications. The digital television (TV) signal reaching homes is showing new two-way digital signaling capabilities where home viewers can actually interact with the TV broadcasting facility in a variety of ways. One of them is video on demand and pay-per-view.
An analog-to-digital (A/D) converter is a device built into the digital signal processor. The A/D converter converts analog to digital, and the digital-to-analog (D/A) converter converts digital to analog. For example, the output of an A/D converter can be stored as a binary file on a PC or laptop.
The digital signal processor has a digital processing unit capable of receiving machine instructions that belong to the plus-argument opcode format of that computer program. For example, a numeric code such as 9E can produce a machine sequence that transfers the contents of an 8-bit register into a cascaded digital port in a digital-to-analog converter. The digital processing unit can perform almost any type of digital computation.
There are many interesting applications for the digital signal processor. In noise reduction, the goal may be to eliminate audible noise that repeats regularly or is of a periodic nature, such as engine or engine noise. A digital signal processor can detect noise, which it converts to digital. Given the digital data and the expected delays involved, the digital signal processor generates “out of phase” noise canceling as digital words that will be fed into the onboard D/A converter to drive an analog noise canceling speaker . The resulting noise level is significantly reduced because this computer program also monitors the resulting noise level and makes digital adjustments to compensate for the slightest noise.
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