Speech sign processing



Speech signal processing is just like as the talk processing in which first the transmission is analyzed and then being procesed ithe form of digital control. It involves the signals like audio signs, image signs, electrocardiogram alerts and control system impulses. The speech indication handling is the blend of the speech processing and the sign processing. Speech handling is just the analysis of the alerts like music, image, etc. and then these indicators are being refined in the form of digital representation.


Speech sign processingis the analysis ofspeechsignalsand the processing methods of these signs. The can be audio, image, control, electrocardiogram impulses, etc. The signals are usually prepared in adigitalrepresentation, so that the speech handling can be regarded as a special case ofdigital signal control, applied to speech signal. Also, they are very close tothe natural language processing(NLP), as its source will come from / result can go to NLP applications. There can be an example like words to speech indication designed to use an information extraction techniques. It refers to the acquisition, manipulation, safe-keeping, transfer and outcome of vocal utterances by way of a computer. The primary applications of conversation signal handling are:

1. 1) Speech recognition

1. 2) Talk synthesis

1. 3) Talk compression

The speech sign control is the combination of the talk handling and the transmission processing.

Speech processing is merely the study of the impulses like audio tracks, image, etc. and then these alerts are being processed in the form of digital representation. It is divided into the following five categories: conversation coding, speech acknowledgement, voice analysis, speech synthesis and talk enhacement.

Signal processing is an area ofelectrical engineeringandapplied mathematicsthat deals with operations on or examination of alerts, in either discrete or continuous time to execute useful operations on those signs. Depending upon the applying, a useful procedure could be filtering, spectral analysis, data compression, data transmitting, denoising, prediction, smoothing, deblurring, tomographic reconstruction, recognition, classification, or a number of other operations. Indicators appealing can includesound, images, time-varying measurement values andsensordata, for example the biological data such as the electrocardiogram impulses, the control systemsignals, telecommunicationtransmissionsignals such as radio impulses, and many more. Signalsare analog or digital electric representations of time-varying or spatial-varying physical quantities. In the framework of signal control, arbitrary binary data channels and on-off impulses are not regarded as signs, but only analog and digital signs that are representations of analog physical quantities. The signal control is categorised into three types that are: audio signal processing, discrete time control and the digital transmission processing.


It is also called voice acknowledgement which targets capturing the human voice as a digital sond influx and switching it in to the format which can be read by computer. It is also known as programmed speech reputation or the computer conversation rscognition. It turns the tone of individual in to the machine readable input like computers. The term "voice recognition" is sometimes used to make reference to speech recognition where in fact the identification system is trained to a specific speaker - as is the truth for most desktop reputation software, hence there is an aspect ofspeaker recognition, which attempts to identify the person speaking, to better recognise what's being said. Speech recognition is a wide term which means it can recognise almost anybodys conversation - like a callcentre system designed to recognise many voices. Words recognition is a system trained to a specific end user, where it recognises their talk based on their particular vocal audio.

The applications of conversation recognition are the following:

a. ) Health care:

In medical care, voice identification technologies are sidely used. Talk reputation can be applied in front-end or back-end of the medical paperwork process. Front-End SR is where in fact the provider dictates into a speech-recognition engine unit, the known words are exhibited right after these are spoken, and the dictator is in charge of editing and signing off on the doc. It never undergoes an MT/editor. Back-End SR or Deferred SR is where the supplier dictates into an electronic dictation system, and the tone of voice is routed by way of a speech-recognition machine and the identified draft record is routed along with the original voice file to the MT/editor, who edits the draft and finalizes the article. Deferred SR is being widely used on the market presently. ManyElectronic Medical Records(EMR) applications can be more effective and may be performed easier when deployed in conjunction with a speech-recognition engine. Searches, inquiries, and form filling up may all be faster to execute by tone of voice than by by using a keyboard.

b. ) Army:

Substantial initiatives have been dedicated within the last ten years to the test and evaluation of conversation popularity in fighter airplane. Of particular word are the U. S. program in talk identification for the Advanced Fighter Technology Integration (AFTI)/F-16aircraft (F-16 VISTA), this program in France on installing talk reputation systems onMirageaircraft, and programs in the UK dealing with a variety of aircraft programs. In these programs, conversation recognizers have been handled efficiently in fighter airplane with applications including: establishing radio frequencies, commanding an autopilot system, arranging steer-point coordinates and weapons release guidelines, and controlling airline flight shows. Generally, only very limited, constrained vocabularies have been used successfully, and a major effort has been specialized in integration of the talk recognizer with the avionics system.

Some important conclusions from the task were as follows:

* Speech popularity has definite potential for reducing pilot workload, but this potential was not understood consistently.

* Success of very high recognition correctness (95% or even more) was the most critical factor for making the speech popularity system useful- with lower popularity rates, pilots wouldn't normally use the machine.

* More natural vocabulary and sentence structure, and shorter training times would be useful, but only if very high reputation rates could be maintained.

Laboratory research in solid speech acknowledgement for military surroundings has produced appealing results which, if extendable to the cockpit, should enhance the utility of conversation acceptance in high-performance aeroplanes.

Working with Swedish pilots flying in theJAS-39Gripen cockpit, Englund (2004) found acceptance deteriorated with increasing G-loads. It was also figured adaptation greatly upgraded the results in every conditions and introducing models for deep breathing was shown to improve recognition ratings significantly. Unlike what might be likely, no ramifications of the broken English of the speaker systems were found. It had been obvious that spontaneous talk brought on problems for the recognizer, as could be expected. A constrained vocabulary, and above all, an effective syntax, could thus be expected to improve acceptance accuracy significantly.

TheEurofighter Typhooncurrently operating with the UKRAFemploys a speaker-dependent system, i. e. it needs each pilot to create a template. The system is not used for just about any basic safety critical or weapon critical duties, such as weapon release or lowering of the undercarriage, but is used for an array of othercockpitfunctions. Voice orders are confirmed by visual and/or aural responses. The system is seen as a major design feature in the reduction of pilotworkload, and even allows the pilot to assign targets to himself with two simple voice commands or even to any of his wingmen with only five commands.


The artificial production of human talk is named the speech synthesis. A computer system used for this function is called aspeech synthesizer, and can be integrated insoftwareorhardware. It's the reverse process of speech popularity and innovations in the area to enhance the computer's usability for the visually impaired. Atext-to-speech (TTS)system turns normal language content material into speech, other systems rendersymbolic linguistic representationslikephonetic transcriptionsinto speech.

Synthesized talk can be created by concatenating bits of recorded conversation that are stored in adatabase. Systems differ in how big is the stored conversation units; a system that storesphonesordiphonesprovides the greatest output range, but may lack quality. For specific usage domains, the storage space of entire words or sentences allows for high-quality output. Additionally, a synthesizer can add a model of thevocal tractand other real human voice characteristics to make a completely "synthetic" words output.

The quality of the speech synthesizer is judged by its similarity to the individuals voice and by its ability to be known. An intelligible text-to-speech program allows people withvisual impairmentsorreading disabilitiesto pay attention to written works on a family computer. Many computer operating systems have included speech synthesizers since the early 1980s.

A wording to speech system (TTS) is explained below:

Overview of a typical TTS system

A text-to-speech system comprises two parts: afront-endand aback-end. The front-end has two major responsibilities. First, it turns raw text containing symbols like quantities and abbreviations into the equivalent of written-out words. This technique is often calledtext normalization. The front-end then assignsphonetic transcriptionsto each expression, and divides and grades the written text intoprosodic items, likephrases, clauses, andsentences. The process of assigning phonetic transcriptions to words is calledtext-to-speech. Phonetic transcriptions and prosody information along constitute the symbolic linguistic representation that is result by the front-end. The back-end also known as thesynthesizer then turns the symbolic linguistic representation into audio.

The request of conversation synthesis are:

a. ) Convenience:

Speech synthesis have a technology tool and its own application is widely spread in a few areas. It allows environmental barriers to be removed for people with a wide range of disabilities. The longest software has been around the use ofscreenreadersfor people withvisual impairment, but text-to-speech systems are actually commonly employed by people withdyslexiaand other reading complications as well as by pre-literate young people. Also, they are frequently employed to assist people that have severespeech impairmentusually by having a dedicatedvoice outcome communication help.

b. ) Entertainment:

Speech synthesis techniques are also trusted as entertainment such as video games. In 2007, Animo Small announced the introduction of a software program package based on its conversation synthesis software FineSpeech, explicitly geared towards customers in the entertainment market sectors, able to create narration and lines of dialogue regarding to user features. The application come to maturity in 2008, when NECBiglobeannounced an online service that allows users to build phrases from the voices ofCode Geass: Lelouch of the Rebellion R2character types. Software such asVocaloidcan generate singing voices via lyrics and melody. That is also the aim of the Singing Computer project (which uses theGPLsoftwareLilypondandFestival) to help blind people check their lyric type.


It is vital in the telecommunications area for increasing the quantity of information which is often transferred, stored, or noticed, for a given set of time and space constraints. The compression of talk alerts has many practical applications. One of these is within digital cellular technology where many users discuss the same rate of recurrence bandwidth. Compression allows more users to talk about the system than normally possible. Another example is in digital voice storage (e. g. answering machines). For a given ram size, compression allows much longer emails to be stored than usually.

In the history, the digital talk signals are sampled for a price of 8000 samples/sec. Each one of the sample is symbolized by 8 bits (using mu-law). This corresponds to an uncompressed rate of 64 kbps (kbits/sec). With current compression techniques (which are lossy), it is possible to reduce the rate to 8 kbps with minimal perceptible damage in quality. Further compression is possible at a price of lower quality. All the current low-rate conversation coders derive from the concept oflinear predictive coding (LPC)which is presented in the next sections.

Speech compression may also means the two various things i. e. conversation coding and time compressed talk.

Now, there is an example that how we speak and exactly how speech comes out from our mouth.

Physical Style of Speech Production

When we speak:

Air is pressed from your lung through your vocal tract and out of the mouth area comes speech.

a. For certainvoicedsound, your vocal cords vibrate (open and close). The rate at which the vocal cords vibrate determines thepitchof your tone. Women and young children tend to have high pitch (fast vibration) while adult males tend to have low pitch (poor vibration).

b. For certainfricatives and plosive (or unvoiced)sound, your vocal cords do not vibrate but stay constantly opened up.

c. The shape of your vocal tract determines the sound that you make.

d. While you speak, your vocal tract changes its shape producing different sound.

e. The condition of the vocal tract changes relatively slowly but surely (on the scale of 10 msec to 100 msec).

f. The quantity of air via your lung decides the loudness of your voice.


Speech transmission processingis the analysis ofspeechsignalsand the handling methods of these impulses. The can be audio, image, control, electrocardiogram impulses, etc. The impulses are usually prepared in adigitalrepresentation. The talk signal control is the combo of the speech handling and the signal processing. The primary applications of speech signal processing are: Speech popularity, Talk synthesis and Talk compression. The man-made production of individual speech is called the conversation synthesis. Speech handling is just the analysis of the signals like audio tracks, image, etc. and then these signals are being prepared by means of digital representation.


[1] http://en. wikipedia. org/wiki/Speech_signal_processing

[2] http://en. wikipedia. org/wiki/Speech_recognition

[3] http://en. wikipedia. org/wiki/Speech_synthesis

[4] http://en. wikipedia. org/wiki/Speech_compression

[5] http://en. wikipedia. org/wiki/Signal_processing

[6] http://en. wikipedia. org/wiki/Speech_processing

[7] http://www. dspecialists. com/en/produkte/audiosysteme/software/sprachsignalverarbeitung. html

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