Automatic speech recognition ppt result

This moment has been a long time coming. The technology behind speech recognition has been in development for over half a century, going through several periods of intense promise — and disappointment.

So what changed to make ASR viable in commercial applications? And what exactly could these systems accomplish, long before any of us had heard of Siri? The story of speech recognition is as much about the application of different approaches as the development of raw technology, though the two are inextricably linked.

Over a period of decades, researchers would conceive of myriad ways to dissect language: by sounds, by structure — and with statistics. Human interest in recognizing and synthesizing speech dates back hundreds of years at least! Audrey could recognize spoken numerical digits by looking for audio fingerprints called formants — the distilled essences of sounds.

Better yet, Shoebox could pass the math problem to an adding machine, which would calculate and print the answer. Meanwhile, researchers in Japan built hardware that could recognize the constituent parts of speech like vowels; other systems could evaluate the structure of speech to figure out where a word might end. And a team at University College in England could recognize 4 vowels and 9 consonants by analyzing phonemes, the discrete sounds of a language. And then: disaster.

The turning point came in the form of a letter written by John R. Pierce in Pierce had long since established himself as an engineer of international renown; among other achievements he coined the word transistor now ubiquitous in engineering and helped launch Echo Ithe first-ever communications satellite.

By he was an executive at Bell Labs, which had invested extensively in the development of speech recognition.

Pierce, Thankfully there was more optimism elsewhere. In the early s, the U. Despite this progress, by the end of the s ASR was still a long ways from being viable for anything but highly-specific use-cases. This hurts my head, too. A large part of the improvement in speech recognition systems since the late s is due to the power of this statistical approach, coupled with the advances in computer technology necessary to implement HMMs.

HMMs took the industry by storm — but they were no overnight success. Jim Baker first applied them to speech recognition in the early s at CMU, and the models themselves had been described by Leonard E.

These data-driven approaches also facilitated progress that had as much to do with industry collaboration and accountability as individual eureka moments. With the increasing popularity of statistical models, the ASR field began coalescing around a suite of tests that would provide a standardized benchmark to compare to. This was further encouraged by the release of shared data sets: large corpuses of data that researchers could use to train and test their models on.

In other words: finally, there was an imperfect way to measure and compare success. NovemberInfoworld. And it required that users speak in a stilted manner: Dragon could initially recognize only 30—40 words a minute; people typically talk around four times faster than that. But it worked well enough for Dragon to grow into a business with hundreds of employees, and customers spanning healthcare, law, and more.

Even so, there may have been as many grumbles as squeals of delight: to the degree that there is consumer skepticism around ASR today, some of the credit should go to the over-enthusiastic marketing of these early products. But without the efforts of industry pioneers James and Janet Baker who founded Dragon Systems inthe productization of ASR may have taken much longer.

The latter article surveys the state of the industry circawhen the paper was published — and serves as a sort of rebuttal to the pessimism of the original.

Among its takeaways:. The Whither sequel ends with a prognosis, forecasting where ASR would head in the years after Among their eight predictions:.Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. Published on Jun 14, SlideShare Explore Search You.

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automatic speech recognition ppt result

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Help Preferences Sign up Log in. To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Title: Automatic Speech Recognition.

Description: 2 Marry picks a color ball, tells the blind observer 3 Marry puts the ball back in urn Tags: and automatic news observer recognition speech.

automatic speech recognition ppt result

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automatic speech recognition ppt result

Marry plays a game with a blind observer 1 Marry initially select an urn at random 2 Marry picks a color ball, tells the blind observer 3 Marry puts the ball back in urn 4 Marry moves to the next urn randomly 5 Repeat steps 14 Example Urn-and-Ball 2?

Observation Sequence - The color sequence of picked-up balls? States - The identity of the urn? State Transitions - The process of selecting the urns? An Observation Sequence? A Set of N States? Resulting State Sequence? Transition Probabilities? A Set of M Observation Symbols?The table below presents the results. The rows are ordered by the median of their WER scores across all 12 files.

Each cell is color coded according to the degree to which the WER score is better lower, deeper green or worse higher, deeper red than the median of this set of results for that file. One of the few benefits of taking years to work through this process is that I can see how ASR results for a service change over time. The prices shown are the approximate USD cost per hour, ignoring any free tier or bulk discounts.

A 2019 Guide for Automatic Speech Recognition

The problem in my previous test, where the transcript of the F E82 clip was missing a chunk of text, was still present. You already have a job that used a file with this name. Are you sure you want to select it again? Speechmatics uploaded the file, took some time to transcribe each one, and charged me for the service. When I downloaded the transcripts I found that they were identical to the previous transcripts generated in This seemed suspicious so I edited an audio file to remove a tiny moment of silence and tried again.

This time the transcript was different, so I did the same for all the other files. That sure seems like a bug. Speechmatics score has dropped since December Jay Lee, the General Manager of speech services at Rev.

We had a call where we talked over the project, my methods, the results. Full disclosure: Jay very kindly donated enough minutes of Rev. I tested their Rev. As I was drafting this post Eddie Gahan from 3Scribe contacted me with an invitation to try out their new service. Their scores are impressive. Each service has a relatively high WER score when using the transcript from one of the others as the ground truth. This is good. But which ones would have a significant effect?

I picked a number of parameters and ran transcriptions with various combinations of likely-looking parameter values. I was especially hopeful that specifying a NAICS code for the topic of the podcast would have a positive effect. To cut a long story short, nothing made a significant difference, except providing a vocabulary.Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. Published on Jul 9, A basic introduction to Isolated word speech recognition engine for low cost applications. Credits to respective owners. SlideShare Explore Search You. Submit Search. Home Explore. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads.

You can change your ad preferences anytime. Automatic speech recognition. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px.

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Start on. Show related SlideShares at end. WordPress Shortcode.Computer-based processing and identification of human voices is known as speech recognition. It can be used to authenticate users in certain systems, as well as provide instructions to smart devices like the Google Assistant, Siri or Cortana.

Essentially, it works by storing a human voice and training an automatic speech recognition system to recognize vocabulary and speech patterns in that voice.

GPUs are used because the model is trained using thousands of hours of data. The model has also been built to effectively handle noisy environments. The major building block of Deep Speech is a recurrent neural network that has been trained to ingest speech spectrograms and generate English text transcriptions. The purpose of the RNN is to convert an input sequence into a sequence of character probabilities for the transcription.

The RNN has five layers of hidden units, with the first three layers not being recurrent. At each time step, the non-recurrent layers work on independent data. The fourth layer is a bi-directional recurrent layer with two sets of hidden units. One set has forward recurrence while the other has backward recurrence. They also integrate an N-gram language model in their system because N-gram models are easily trained from huge unlabeled text corpora.

The figure below shows an example of transcriptions from the RNN. Machine learning is rapidly moving closer to where data is collected — edge devices. Subscribe to the Fritz AI Newsletter to learn more about this transition and how it can help scale your business. In the second iteration of Deep Speech, the authors use an end-to-end deep learning method to recognize Mandarin Chinese and English speech.

The proposed model is able to handle different languages and accents, as well as noisy environments. The authors use high-performance computing HPC techniques to achieve a 7x speed increment from their previous model. The English speech system is trained on 11, hours of speech, while the Mandarin system is trained on 9, hours.

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During training, the authors use data synthesis to augment the data. The architecture used in this model has up to 11 layers made up of bidirectional recurrent layers and convolutional layers. The computation power of this model is 8x faster than that of Deep Speech 1. The authors use Batch Normalization for optimization.

automatic speech recognition ppt result

For the activation function, they use the clipped rectified linear ReLU function. At its core, this architecture is similar to Deep Speech 1. The architecture is a recurrent neural network trained to ingest speech spectrograms and output text transcriptions.

The model is trained using the CTC loss function. Below is a comparison of the Word Error Rate comparison for various arrangements of convolution layers. Deep Speech 2 has a much lower Word Error Rate.


The authors benchmark the system on two test datasets from the Wall Street Journal corpus of news articles. The model outperforms humans on the Word Error Rate on three out of four occasions. The LibriSpeech corpus is also used.

Machine learning is moving closer and closer to edge devices. Fritz AI is here to help with this transition. Explore our suite of developer tools that makes it easy to teach devices to see, hear, sense, and think. The authors of this paper are from Stanford University. In this paper, they present a technique that performs first-pass large vocabulary speech recognition using a language model and a neural network. The neural network is trained using the connectionist temporal classification CTC loss function.AI is the study of the abilities for computers to perform tasks, which currently are better done by humans.

AI has an interdisciplinary field where computer science intersects with philosophy, psychology, engineering and other fields. Humans make decisions based upon experience and intention. The essence of AI in the integration of computer to mimic this learning process is known as Artificial Intelligence Integration.

When you dial the telephone number of a big company, you are likely to hear the sonorous voice of a cultured lady who responds to your call with great courtesy saying "welcome to company X. Please give me the extension number you want".

You pronounces the extension number, your name, and the name of the person you want to contact. If the called person accepts the call, the connection is given quickly.

This is artificial intelligence where an automatic call-handling system is used without employing any telephone operator. Artificial intelligence AI involves two basic ideas. First, it involves studying the thought processes of human beings. Second, it deals with representing those processes via machines like computers, robots, etc. AI is behaviour of a machine, which, if performed by a human being, would be called intelligence. It makes machines smarter and more useful, and is less expensive than natural intelligence.

Natural language processing NLP refers to artificial intelligence methods of communicating with a computer in a natural language like English. The main objective of a NLP program is to understand input and initiate action. The input words are scanned and matched against internally stored known words. Identification of a keyword causes some action to be taken. In this way, one can communicate with the computer in one's language. No special commands or computer language are required. There is no need to enter programs in a special language for creating software.

Voice XML takes speech recognition even further. Instead of talking to your computer, you're essentially talking to a web site, and you're doing this over the phone.

A Brief History of ASR: Automatic Speech Recognition

OK, you say, well, what exactly is speech recognition? Simply put, it is the process of converting spoken input to text.

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Speech recognition is thus sometimes referred to as speech-to-text. Speech recognition allows you to provide input to an application with your voice. Just like clicking with your mouse, typing on your keyboard, or pressing a key on the phone keypad provides input to an application; speech recognition allows you to provide input by talking.

In the desktop world, you need a microphone to be able to do this. In the Voice XML world, all you need is a telephone.

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