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Audio books have been known for its benefit in reading classes. Compared to the traditional story-telling in schools, listening to audio books have been found effective in enhancing a child”s listening skills and teaching proper pronunciation of words. While many educational researchers have contended the use of audio books in schools as these might promote laziness in reading among kids, more and more schools continue to play CDs and cassette tapes during reading time because of the audio books” convenience and practicality.

Since audio books can be costly when bought from bookstores, teachers resort to download audio books free from many websites. However, not all the audio books available online have a good quality.

When downloading audio books, the first thing to consider is the clarity of the recorded reader”s voice. Teachers who download free audio books should be keen on the quality of the voicing, sound beds, and sound effects. The sound bites should aid in keeping the attention of children and not in distracting them.
These and other information book lovers need to know before they download audio books free are available from websites that offer free audio books. You can get the best quality of books from these websites and save some time to do other activities rather than searching from one website to another for good audio books.

Most of the website offering free audio books also offer a wide selection of books written by popular authors from the works of Stephen King and Dan Brown. With over 85,000 titles, you can surely find that book you”ve been eyeing for so long. It gives an easy step-by-step procedure when you want to download free audio books so you can never go wrong. For as long as you have a reliable internet, you can have the luxury of listening to your favourite novel anytime anywhere.
So when you”re looking for high quality audio books, all you have to do is visit the website and click on your favourite title. Put on your headsets and earphones, relax, and enjoy the book.

Home theater systems are a present in homes installed for the purpose of providing cinema quality video and audio duplicate. It includes television and video equipment with special audio systems integrated – like surround sound. Have a look below configuration of some branded home theatre systems:

(1). Home Theater System – 5000 PMPO

Home Theater System – 5000 PMPO – 5.1 with 5.1 channel DVD player with USB & SD card slot + Mpeg and Divx Features:

.Subwoofer, Speaker type: 5.25 woofer
.Impendence: 4 Ohm
.Frequency Response: 40- 300Hz
.Efficiency: 92dB, Satellite
.Speaker type: 3.0 woofer, Impedance: 4 Ohm
.Frequency Response: 200- 18KHz
.Efficiency: 85dB
.Input Sensitivity: 500mV
.S/N Ratio: 75dB

Accessories: .

.5.1 Subwoofer/Amplifier Unit
.Phone to 3.5mm jack socket
.Phone AV jack Plug, Remote control Unit
.Combo with Latest and most advanced DVD player by VOX
.1200 lines high clarity pictures
.32 kind of captions, 8 languages
.5.1 sound track output
.Simulation DTS Digital Audio – Frequency output
.Dolby Ac 3 output & Digital coaxial output
.Optical Fiber output & S Video Output
.Complete function digital karaoke
.Support SD/MMC card, USB and Game port

(2). 5.1 Home Theatre System – 6200 P.M.P.O

Features:

.5.1 Home Theatre System with Display and Remote
.Output Power : 6200 Watts P.M.P.O
.Professionally designed built-in amplifier, subwoofer and satellite speaker designed.
.5.25″ professionally enhanced subwoofer driver.
.Outside heat sink designed.
.Dynamic bass boost, Low distortion.
.The system can be connected to DVD and any other Audio output equipment.
.The system is magnetically shielded which can be put near the monitor or TV and without magnetic influence.
.Remote Control designed.
.AUX and 5.1 CH switch Function.
.Point hosters Power are pointing remote control on Power machine start job aboard first.
.When playing the music, adjust all control knob to demanding level.
.Power Output : 30 W + 10W X 5
.Frequency Response : BASS : 10Hz ~ 300Hz
.Control : Volume , Mute, Menu, 5.1 /AUX / Remote

Accessories:

.Subwoofer Speaker :1 pcs
.Satellite Speaker : 5 pcs
.Audio Cable : 6 pcs, User
.Manual: 1 pcs
.Remote Control :1 pcs

Author suggests you to buy home theatre speakers from homeshop18 and get maximum discount.

Did you know that A trucker working to the legal limit in the U.S. can rack up to 3,432 driving hours a yearnearly 10 times that of the average New York commuter or enough to listen to the unabridged audio book version of Bill Clintons My Life 77 times? (Publishing Trends, Market Partners International, September 2005).
Think of the way audio books could optimize your time management. Audio books can turn the day to a 26 hours day. Yes, audio books can add extra two hours each day. Still not convinced? Did you know that The average rush hour driver will spend an additional 62 hours stuck in trafficat standstilleach year and that More than 97 million workers drive alone to work each day.

Well, enough with that pile of useless data, Think about yourself what have you been doing while driving – Listening to the radio? Making unnecessary calls with your mobile phone? Wasting valuable time?
Now close your eyes and imagine you could read the last edition of the New York Times, Read the last Harry Potter book or learn Chinese all simultaneously while driving your car. Now open your eyes and stop dreaming, you can do it all now. The only difference is that you are going to use a new method of reading listening to audio books.

And it is so easy: You may get audio books in different formats from books on tapes and audio books on CD to downloadable audio books. You can get it from different sources libraries, book and music stores and online audio book sources. You could buy audio books, rent audio books and even get free audio books. According to eBrain Market Research survey, 71% of the audio book listeners listen to them on long car trips.

Believe me; I couldnt wait getting into the heavy morning traffic listening to the audio book IT by Stephen king. In fact, I couldnt resist listening to it at home after work. I love audio books.

The concept of forensic audio investigation may have become popular in recent years along with the forensic sciences in general but it’s been in practice since World War II. With audio use in full swing for radio transmissions across long distances, scientists were trying to identify the voices of their enemies among the many radio broadcasts that took place on open frequencies. The work done in forensic audio investigation today is based on the pioneer work of those scientists.

Specifically, forensic audio has to do with any type of audio of an evidentiary nature. In modern cases, law enforcement or other legal professionals (e.g., defense attorneys and prosecutors) will turn to a forensic audio examiner to perform any one of a number of services where audio is concerned.

In many cases these specialists are hired on a contract basis.

While the most common Hollywood portrayal is audio enhancement with a few twists of a knob (if only it were so easy) there is a great deal of work that can be done:

* Audio Enhancement – the most common and offered by just about every forensic audio company you can find.
* Audio Authentication – geared toward tape and digital formats
* Forensic Transcription
* Speaker Identification

There are also a number of other services or procedures that can be classified in their own right as a specialty process or “miscellaneous” in terms of categorization. This article will focus specifically on Audio Enhancement and Authentication.

Audio Enhancement

Audio enhancement is the most common and well known service where forensic audio is concerned.

It’s not likely that one can take a garbled and mangled inaudible conversation and “tweak it” to produce clear speech that is intelligible. While audio enhancement isn’t specifically focused on speech, that is usually the intent behind cleaning up or enhancing audio for legal purposes. It’s a means of reducing or filtering out unwanted noise from a poor recording in order to clear up the speech that’s covered with noise or is a victim of poor recording methods.

A forensic examiner is not a miracle worker however, and while modern software and equipment has provided a variety of tools to improve the quality of speech in a recording, there are still limitations. When it comes to enhancing speech, you can’t fix something that’s just not there. If the recording doesn’t contain the robust elements of someone’s speech, and the equipment only picked up bits of a word or phrase, there is no magic software to fill in the blanks. Enhancement techniques can sometimes have fantastic results with intelligibility, but more often would be a disappointment to the layperson.

In terms of speech enhancement, an examiner can offer critical listening in combination with forensic transcription and speech decoding methods to help identify and discern what is being said. Again, technology can only do so much so an examiner with linguistics and phonetics experience is usually best for the job. However, if the speech waveform isn’t picked up by the recording device or is masked by noises of the same frequency range, he won’t be able to decipher the speech.

Forensic audio enhancement sometimes simply involves increasing the volume of a whisper from a suspect where traditional playback – even at high volume – can’t help an individual understand the utterance. Audio enhancement offers the most benefit in situations where noise can be eliminated or at least reduced so as not to distract the listener from the speech. Enhancement techniques are quite good at getting rid of electronic buzzing or hum and other noises such as tape hiss, the crackles and pops of a phonograph record or the beeping of a backing truck, open car door, low battery warning of a fire detector, etc. Enhancement used in this way is often called improving the listenability of the recording. Unintelligible speech isn’t made intelligible but the recording is easier on the ears.

Audio Authentication

Authenticity is an important part of legal matters where evidence is concerned. This is especially true when it comes to audio that is or will be entered into evidence in a criminal or civil matter. As technology advances, it becomes progressively easier for an individual to tamper with a recording.

Audio authentication – either involving tape authentication or digital file authentication – is a way to ensure that the audio being utilized as evidence has not been tampered with in some way.

Not only will a forensic audio examiner use software to examine the actual recording, but authentication involves examining the physical tape itself and its casing.

This includes:

* Checking the tape for splices
* Examining the tape’s plastic shell to check for prying or disassembly
* A process of examining the tape call magnetic development

Magnetic development involves using a magnetic liquid called ferrofluid in the examination of audio or video tape. The ferrofluid allows the forensic examiner to see the magnetic patterns on a tape. The types of things the audio engineer would look for include magnetic signatures left by stopping, pausing and starting the recording process. It can also be possible to tell if the tape has been recorded over or simply erased and left blank.

Newer software provides an edge when it comes to detecting authenticity in audio as it looks into variances that could lead to falsification of a recording – particular in tape recordings:

* Equipment noise – hums, pops, varying pitch in inconsistent forms over the whole of the recording
* Fading – Any gradual or sudden decline in volume that effects the interpretation of noise or dialogue. If the sound cuts out completely that becomes a gap in the recording
* Gaps – Any segment where there is a change (often unexplained) in the content or context of an audio recording. A perfect example of this is the infamous Watergate recording where there is an 18 and minute gap in the recorded audio that was later discovered to be an overlaid recording of electrical interference.
* Transients – These are clicks or pops and other “attack” sounds within a recording and may signify that there has been a splice or some other alteration to the recording

There are a number of methods that are used to authenticate a recording, checking it specifically for originality. An obvious and important tool that a forensic audio examiner has is the ear. Critical listening affords a great deal of benefit and it takes training and experience to know what to listen for while playing a track over and over.

In some cases, an examiner may have to run through a section of audio many dozens of times. They examine bits of a conversation or sections of a recording to fully understand the sounds – including both foreground and background sounds. If something stands out the examiner will further investigate that specific segment using their trained ear to discern if the recorded event is authentic or not.

Beyond listening, the examiner utilizes physical inspection as well as spectrum and waveform analysis to visually inspect the quality and construct of a specific piece of audio. All of these methods come together allowing the examiner to certify the authenticity of a tape recording.

Things become more difficult when a recording is made using a digital recorder that creates audio files such as .wav or .mp3. While many of the above methods may be useful with a recording that originated as a digital file, it is somewhat easy for a knowledgeable person to edit the file without leaving any known sign of doing so.

One promising method of digital authentication is the use of ENF (electric network frequency) data. Whenever someone is recording while plugged into an electrical outlet or using a battery operated device within an ENF magnetic field, their recording will include a 50Hz or 60Hz (depending on country) waveform signature. This signature can be compared to an ENF database to possibly determine where and when the recording was made, whether it’s an original or a copy, or whether it was edited or altered in anyway. Digital audio authenticity examination, and more specifically the use of ENF, is in its infancy and has a way to go before forensic audio examiners reach the level of sophistication that has been achieved with authentication of analog tape recordings.

The use of software to determine authenticity and enhance audio is just the beginning when it comes to forensic audio. Depending on the situation, additional specialty services or skills may need to be applied such as speaker identification and the analysis of gunshot sounds to determine if more than one weapon was used, which type of firearm was used, or the sequence of the shots fired. Forensic audio is a robust trade that encompasses a number of specialists who work together to bring clarity through the study and examination of audio.

The human mind goes through several wave cycles everyday. Each of these waves is associated with a different conscious state of the brain. Altering these waves will alter mental states. Most of the brainwaves fall below the audio limit of human ears (20 20,000 Hz). Binaural beats provide a convenient access to the frequency range of the brainwaves. They have been known for over 170 years and can be easily used to explore and awaken various brain states.

Audio recordings with embedded binaural beats have opened up a lot of opportunity for personal growth. They offer the most convenient and quick way of reaching the subconscious mind that is not possible with any other technique. For example, every one wants to stay away from stress and anxieties of daily life, but hardly anyone is adept at relaxing at will. Listening to binaural beats recordings can straight away put you in a highly relaxed state within minutes. No other technique can relax you so easily and so fast.

Binaural beats can be embedded music

Binaural beats are not sound waves so do not hear them through ears; they are created in the brain when two slightly different audio frequencies are fed one through each ear. For instance, if a frequency of 350 Hz is fed to the left ear and 360 Hz to the right ear, binaural beats of the difference frequency, 10 Hz is generated in the brain.

These are embedded in the recordings of some pleasant sound like that of ocean waves, flowing river, waterfall or rain etc. These pleasing natural sounds generate a relaxing and receptive mood, which further assists in the functioning of the binaural beats.

Brainwaves and entrainment

When the recordings are played, the current dominant brainwave shifts to match the applied binaural beats frequency. This tendency to synchronize with the applied signal is called entrainment (or frequency following response). After entrainment, if the frequency of the beat is changed the brain follows it. So, now what brain state is experienced depends on what the frequency of the beat is.

Just by changing the frequency you can explore states of deep sleep in the delta wave region (0-4 Hz), generate meditative or dream states in the theta wave region (4-7 Hz), or relaxed wakeful states of the alpha waves (7-13 Hz). The manner in which the beat frequency is varied depends on the purpose at hand.

For instance, for lucid dreaming you would like to be in the theta brainwave state where dreams occur. But you would go for a brief trip to the alpha state where you have awakened awareness, and quickly come back to the theta state again. Hence, the person dreams and also knows it because of the brief excursions to the waking alpha state. Recording for the purpose of meditation will have different binaural beats. I think you got the general idea.

Availability of music with binaural beats has opened up an entirely new facility for ordinary folks to develop their personal capabilities at the most basic level. They offer an amazingly simple and quick way to awaken the hidden potentials of mind.

Subliminal affirmation software are what we refer to as computer programs that create either a visual or audio representation of your affirmations. In the case of affirmations using visual subliminal you have a program similar to a screen saver that displays the positive affirmations on your screen for a very short moment. All of this happens so quickly that you don’t realize that a subliminal message was displayed; all at the same time your unconscious captures the message and registers it along with thousands, if not millions, of other information it is processing.

In the case of sound files, or subliminal affirmations mp3s as they are also known, the software transforms the audible affirmations so that you can no longer consciously hear them, yet your unconscious mind picks up the messages and stores them.

Subliminal affirmation software are great tools that technology brings us for easy and effective personal change. Using this specialized software, you can take positive affirmations and digest them through subliminal technology, delivered to you either visually or in audio. The best part is that while you can use your conscious mind to choose to create the positive affirmations, you leave it to the software to deliver the messages to your unconscious.

Your unconscious mind is constantly processing everything that comes to its attention. All information is stored; according to some scientists, on a permanent basis. You can use subliminal affirmation software to create a steady flow of desired statements straight into your unconscious mind’s attention. As the affirmations are repeated, your unconscious considers these as reality. This is the way our unconscious works; if the information keeps coming in and is the same, then it assumes it to be true.

You should be careful when you choose your positive affirmations. Let’s be clear here: We’re stepping under our conscious mind’s radar and planting seeds in our unawareness zone. Whatever you put there will be considered to be true. So don’t start a self talk with yourself saying things that are untrue to who you really are. Your conscious mind will detect it as a core value violation and will ignore it. You won’t benefit from your investment if you’re not careful.

Make sure you are true to yourself when you start making your own subliminal affirmations. Your subliminal affirmation software needs to have the flexibility to choose your own personal affirmations. You also have to look at features for instance update frequency for visual affirmations or different choices to encode audio, if you are utilizing the computer program to generate subliminal affirmation mp3s.

You know when you hear one of your favorite artists is coming into town, and without hesitation, you part with an absurd amount of money to spend, at most, two hours watching them perform? Part of your motivation is because you love this artist, and their music likely served as the background theme songs to pivotal moments in your life – or you just love to sing along in your car.

The other part is the anticipation of the performance itself. You hope it will be captivating. While the artist’s musical ability certainly plays an important role in how spectacular the performance is, they wouldn’t be able to dazzle without audio visual equipment. The same is true for the Oscars, highly televised events, and pretty much every famous performance you can recall.

And it’s why you should definitely hire audio visual equipment for your next corporate event. Of course, there’s no real need for you to host an event that would rival a Rihanna concert (although it wouldn’t hurt) but creating the best possible atmosphere for your guests can only reflect well on your company.

Whether you’re holding a conference, gala dinner, exhibition, award show, exhibition, or any big event, the special occasion requires audio visual equipment to be memorable.

Audio visual equipment can include many things, such as:

Amplifiers

Mixing decks

Data projectors

Video walls

Plasma screens

Data projectors

Exhibition audio kits

While the above is nowhere near an exhaustive list, it does highlight how many other options there are for creating a great corporate event. Leave PowerPoint’s for the conference room and use a wall screen to set the atmosphere for the evening. A wall screen or projector is also a great choice if you’re giving out awards. You can use the projector to highlight some of the nominee’s best moments.

Hiring audio visual equipment allows you to get creative when planning your event, and your guests will surely thank you for it. Even if your guest will only include current employees, hosting an impressive event is also a great way to boost company morale.

If you have never planned a big event, an event planning company that provides audio visual equipment can help you create an event that perfectly reflects your brand. They can also provide solutions specifically designed for the kind of event you’re holding and spacing parameters of your location.

There’s no reason for your event this year to be the exact same as it was last year. Hiring audio visual equipment is a great way to differentiate your brand and create a truly memorable event. If you’re lucky, guests will remember your event as fondly as they remember their favorite concert.

A transformer is an electrical device that allows an AC input signal to produce a related AC output signal without the input and output being physically connected together. The transformer offers several advantages in coupling signals from one circuit to another. A transformer is considered large, heavy, and expensive but it continues to be the most effective solution in many audio applications. Audio transformers improve sound quality by removing interference from audio signals. Audio transformer is generally encased in a magnetic shield which is filled with an epoxy resin that provides insulation, protects the windings, and prevents vibration of the core material. Some audio transformers do not have a center tap, while other devices have a center tap in only the primary side, only the secondary side, or in both the primary and secondary sides. Transformers can be manufactured with multiple primary or secondary windings.

The two types of audio transformers are step up/ step down transformers and unity 1.1 transformers. The basic use of step up transformer is signal level compatibility, and impedance compatibility. Use of unity1.1 transformers are DC blocking, radio frequency interference and ground lift. In step up transformer, the primary and secondary have a different number of windings, thus they have different impedances. A unity transformer allows an audio signal to pass unmodified from the primary to the secondary while blocking DC voltage and radio frequency interference (RFI). Pros of audio transformer is to match impedances, to increase or decrease signal level by up to 25 db. While unity 1:1 transformer is used to increase signal level by more than 25 db. Audio transformer is used in audio devices like microphones, speakers, tape drives to transmit voice and sound signals. The transformers have wide frequency bandwidth, low distortion and noise suppression.

Audio transformers are recognized as wide band transformers. The services that are related to audio transformers are current sense transformers, gate drive transformers, RF transformers, signal transformers, switch mode transformers and telecom transformers. Current sense transformers are used to detect and measure current. Gate drive transformers are used in applications such as switching power supplies. RF transformers transfer energy from one circuit to another by electromagnetic induction. Signal transformers transfer information from one circuit to another by electromagnetic induction. Switch mode transformers are generally used mainly in switching power supplies and DC-DC converters. Telecom transformers are used in applications which require high bandwidths and fast switching speeds.

There are a lot car audio subwoofers available out there. There are online store and off line store. The online store is means that the store in showing by websites. Now there are a lot of online store, so you can easy to get more information.
Car subwoofers is allowing you to enjoy bass. Without them, you won’t generate enough bass waves for your car’s audio system to be enjoyable. You’ll notice that many systems today consist of two subs, or a pair. The reason it’s good to have a pair of subs is because two subwoofers move twice as much air as one sub. This means you’ll be creating twice as much bass waves

The most common sizes of subwoofers are 10″, 12″ and 15″.
10″ subwoofers will hit harder but may not provide sufficient low end bass.
12″ subs will still hit hard and accurate, but will also provide the low end bass extensions. Simply put, 12″ subs are a really great choice for diversity in tunes.
15″ subwoofers may not be as accurate when it comes to hard hitting bass music, such as alternative music, but will provide the deepest bass possible for all the “bassy” tunes you listen to.

If you want your cheap car subwoofer to produce a lot of bass, you’ll generally need at least 250 watts of continuous power handling from each sub. This will give you a total of 500 watts of continuous bass waves. This is should be satisfy your needs. The higher power handling you go, and the more money you’ll be investing. Not only on the subs, but a more powerful amplifier to drive them as well.
There are many brands of car subwoofer to choose. Some of these brands are Pyle Audio, Boss Audio, Kicker, Power Acoustik, DB Bass Inferno and more. All of these brands are widely used and are a great choice. You should expect to pay as little as $20 and up to $400 or more depending on the brand and power handling.
Boss CX8 8″ Subwoofer 4ohm Voice Coil
I will review about Boss CX8 car subwoofer. I review this product because it is the cheap one from Amazon store. This is Boss CX8 and you can get it only $16.13 and free shipping for delivery ( in USA ).
Specification
8-inch subwoofer with 400 watts maximum power handling
4-Ohm impedance
Poly injection cone
Frequency Response: 35Hz – 2.2kHz
Mounting Depth: 3-7/16 Inches

Product Description
One look and you’ll know why they’re called Chaos Exxtreme, but form follows function–these subs are ready to deliver some serious low-end without too much damage to your wallet. The CX8 is a 8-inch sub packing 400 Watts maximum power.
What’s in the Box
Boss CX8 8″ Subwoofer 4-Ohm Voice Coil

Here my short review about Car Cheap Subwoofer from Amazon store. Read also my other guides on New 305 Or 205 Forerunner Garmin, Car Stereo Installation Kits and Garmin GPS Antenna.
If you are interesting in shoes, watches and jewelry you can visit my other sites in Shopping Area. There are a lot of guides and tips and also best review of best product from Amazon store.

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