SPEAKER RECOGNITION

SPEAKER RECOGNITIO is the human identity system based on the voice analysis. Human being is able to identify someone simply by his/her voice. Within few seconds of speech it can be quite enough to identify the voice which is familiar with.

Speaker Recognition can be simply defined as automatic recognizing who is speaking based on his/her voice. Here the machine is treated in such a way that it can understand the voice of one people or a certain group of people and being able to identify them from any other people.

There are mainly two classes of speaker recognition which are very often used.
The first one is “Speaker Verification”. This speaker verification is the process of accepting or rejecting the voice of the user/speaker, this is the simpler one since the machine/computer is just verifies the single user if he/she is the correct user.

The second is the “Speaker Identification”. This speaker identification is the process of identifying a single people among a group of “n” people. This process is somehow complicated since the machine is required to identify which registered user provides given information at that time. It means that there are multiple users who have been registered to that machine so each should be identified and being accepted and use the machine.

There are several advantages of having this knowledge of speaker recognition, but here I am going to site on the most three important.
Speaker recognition for security purposes; for keeping our machine safe we have to put some restriction in such a way that only permitted users will have the access to the machine and not otherwise. This is much better comparing with the use of password and PIN which can easily get lost and sometimes people can still and get access to the machine easily something which is very hard for the case of voice recognition.

The speaker recognition also helps much in control of the restricted services such as banking by telephone, information services and also in voice dialing together with security control of confidential information whereby the required identification is voice. Another thing which is very important in the speaker recognition is in the military services where the machine can be commanded only by the voice of the commander by only talking into the microphone for example “shoot” then the machine start shooting. So this technique of speaker recognition can make people to do multiple works at a time.

The mechanisms on how this system works is somehow complicated since it involves the complex mathematics. But anyway I am going to give just a brief on how the system works. Actually the speaker speaks to the microphone and then the voice is converted to analogy speech signals which is then converted to digital signals and stored as binary words. So the machine can simply identify voice of a speaker by comparing the stored voice and the current voice already in the machine.

Though the speaker recognition system seems to be a better solution for the case of security purposes but still there are some failures which normally people are facing. Most people are facing many problem in this technology, but the three of them are the most common, first is failing to determine the correct unit of recognition i.e. exactly words/phrase, the second is the boundaries of these units for example the voice pitch-high/low and pronunciation of words. The third one is variation in units of speech whereby many people are failing to produce the same voice as the one used in the registration process.

Otherwise the speaker recognition technique is so good and it can improve the security of our properties.

AUTOMATIC ESSAY ASSESSMENT.

Automatic essay assessment;
Automatic essay assessment is the process of evaluating the essay work by using the electronic machine like computers. A computer itself have no ability to do all these instead there is a special software which is purposely for marking and evaluating essay work.
After some years of study, the researchers made a research on how they can improve and simplify the essay work so that the essay work can be marked accurately and being graded according to the nature of the work. So the researchers made a project which was able to measure the total number of words as well as the length of the essay.
The intentions of these researchers were lying on mainly four things; to avoid plagiarism, to improve marking consistency, to analyze learning outcome/evaluation and to determine the grade.
The first one was to avoid plagiarisms among the learners. Marking the essay work manually is quite difficult for the markers to identify if the work has been copied from somebody else or not. So the automatic essay assessment is the better solution in fighting with plagiarism.
The second importance of this automatic essay assessment is to improve the marking consistency. This helps both teachers and learners to be in the safe position i.e. for the case of teachers/markers no biers can be made to students for example giving different grades to the essays of the same quality. Also students should be very creative so as to avoid cheating which will lead them to the low grade. So this is the challenge to both students and teachers since the process looks the qualities of the student’s work and not comparison of the essay with others.
The third thing which is important is to make the evaluation, this automatic essay assessment automatically check the essay work, mark it and the fourth one is to provide the grades according to the nature of the essay given.
Although the automatic essay assessment has got many advantages, but still there are some failures which accompanied by this system. Well in some cases the system can lead into misunderstanding among the learners since if the teacher/marker of the essay work fails to analyze things to be checked during marking process the machine/ computer will produce grades which are irrelevant.
Lastly, the system can only be applicable to the connected people, which mean it can only be used in very few institutions simply because the system won’t work in stand alone computer, the computer should be connected to the internet.