May Bluetooth Outdoor Speakers Deliver CD-Quality Audio?

Have you ever asked what some of the technical jargon means which manufacturers use in order to show the performance of wireless speakers sold by Amphony? In this expose, I am going to highlight one frequently used specification: THD or “total harmonic distortion”.

Cordless speakers are available in all different shapes and sizes. Picking the correct model can frequently be tough. I will shed some light on a commonly utilized term that is used in order to show the technical performance of the speaker: “total harmonic distortion” or “THD”. Total harmonic distortion is usually not very well understood. Nevertheless, this term is still important in terms of determining the performance of a specific type. Other specs, for instance “output power” or “frequency response” are generally easier understood. In a nutshell, THD describes the difference between the sound which is produced by the loudspeaker versus the audio signal with which the speaker is driven. The most common methods to state distortion are percent along with decibel. These two conventions can be translated into one another. If a speaker specifies a distortion of 10% to provide an example then one 10th of the energy radiated by the loudspeaker is distortion. A distortion of 10% may also be shown as -20 dB. 1% distortion is equal to -40dB.

Harmonic distortion in a cordless speaker is actually the result of several components, such as the power amp which is built into the speaker to drive the speaker element. Amplifier distortion normally depends on the amplifier output power and is sometimes specified for several power levels.

Distortion ratings for different output power levels are generally specified for several power levels or as a diagram listing distortion versus output power. Both of these techniques allow to better evaluate the quality of the amplifier.Typically distortion is measured with a 1 kHz test tone. This enables comparing equipment from various manufacturers. Though, distortion usually varies with different frequencies. Many digital amplifiers will show growing distortion amid higher frequency which cannot easily be uncovered by glancing at the specification sheet. The next contributing factor is the loudspeaker element itself. The majority of loudspeakers use a diaphragm kind driver that is driven by a voicecoil which is suspended in a magnetic field. The coil is moving according to the change in the magnetic field which is excited by the audio signal but does not correlate 100% with the signal as a result of core losses along with other factors. As such the result is distortion caused by the speaker element. Many manufacturers will display harmonic distortion based on the power level since usually the higher the speaker is driven the higher the level of distortion.

The total distortion of the speaker thus is the sum total of the amplifier distortion in addition to the loudspeaker element distortion. Furthermore, there are other contributing factors. Depending on the material used to manufacture the loudspeaker enclosure, there will be vibrations or enclosure resonances. Those normally depend on the sound pressure level, the box shape, the housing fabric in addition to audio frequency. For that reason extra audio distortion will be caused by the enclosure itself.

The total distortion of the speaker is usually determined by a measurement which involves a low-distortion audio generator plus a microphone which is connected to an audio analyzer. The audio analyzer is going to calculate the amount of higher harmonics and compare these with the main signal in order to calculate the distortion. Then again, pure sine signals hardly give an accurate indication of the distortion of the wireless speaker with real-world signals. A better distortion analysis is the so-called intermodulation distortion analysis in which a test tone which includes a number of sine waves is used. Then the level of harmonics at other frequencies is measured.

Cordless loudspeakers are going to also have some level of distortion during the audio transmission. The amount of distortion will depend on the sort of cordless transmission method and the quality of components. Generally 900 MHz FM transmitters have among the highest level of distortion. Superior models are going to utilize digital transmission and transmit at 2.4 GHz or 5.8 GHz to reduce signal distortion.

An Evaluation Of Bluetooth Audio Receivers Along With Bluetooth Loudspeakers

Lately many people possess a smartphone. The majority of the latest mobile phones may hold music and also videos. Usually you’d probably enjoy the audio kept on your cell phone by employing some headphones. However, the audio quality of earphones bundled with mobile devices often is rather poor. The majority of loudspeakers provide much better audio quality as compared to tiny earphones. By attaching your cellular phone to a pair of active speakers, it is easy to greatly improve the listening experience. Should you be looking for a method to send tunes from the smartphone to a pair of speakers then you’ll find several choices out there. Below I am going to take a look at a couple of of those alternatives as a way to offer you a better understanding of what is available.

Speakers are generally a good substitute to earbuds that come with a cell phone. They possess significantly better audio quality plus you are no longer tethered to your cellular phone. Connecting your cell phone to a pair of stereo speakers can easily be done in several ways. Bluetooth music receivers tend to be one of the most desired choices with regard to sending tracks from your mobile phone. Almost all of modern mobile devices are able to work with these kinds of music receivers. That is because Bluetooth is compatible with many cellular phones. The music which is embedded within the Bluetooth signal is recovered by the receiver and output to the speakers. Bluetooth supports quite a few protocols with regard to sending audio. A2DP and also AptX are actually among the most commonly used protocols. AptX, though, is only supported by the newest generation of phones whilst A2DP is compatible with virtually all mobile phones.

An important thought on employing Bluetooth speaker systems is that they may only attach to active stereo speakers. Alternatively you may utilize a sound amplifier. Integrated Bluetooth cordless amps, however, don’t require a separate power amp. However, the wireless range of Bluetooth is fairly restricted. Generally you can’t broadcast in excess of 30 ft. This means you are limited to one space. The real range depends on the surroundings as well as on your smartphone. Additionally you can stream tunes from various other gadgets that understand Bluetooth by using the same setup.

Airplay may provide improved audio quality compared to Bluetooth considering that it may transmit uncompressed music. One of the more recent standards used within Bluetooth is AptX. It can provide close to CD-quality music sending – yet again assuming that you have uncompressed music available. This standard isn’t yet recognized by a large number of cellular phones but the most recent Bluetooth receivers offer AptX as an choice.

Bluetooth cordless speakers happen to be one more option for playing songs stored on a cellular phone. You can find plenty of designs out there. It is usually best to test the loudspeakers before your investment. Plenty of Bluetooth speakers are lacking a great deal regarding sound quality as compared to a decent set of regular speakers. To achieve the greatest audio quality, utilizing a standalone Bluetooth music receiver is therefore a terrific idea. You can select any speaker which you prefer. If you desire mobility and select a Bluetooth loudspeaker, check that it works with your particular cell phone first.

A Quick Explanation Of Music Amplifiers

Requirements concerning audio power and audio fidelity of recent speakers and home theater products are constantly increasing. At the core of these systems is the audio amp. Today’s mini amps have to perform well enough to satisfy these always growing demands. It is difficult to pick an amplifier given the big number of styles and concepts. I will explain a few of the most common amp designs including “tube amplifiers”, “linear amplifiers”, “class-AB” and “class-D” and also “class-T amplifiers” to help you understand a few of the terms commonly utilized by amplifier suppliers. This guide should also help you figure out what topology is perfect for your particular application.

The basic operating principle of an audio amp is quite basic. An audio amplifier will take a low-level audio signal. This signal usually originates from a source with a comparatively high impedance. It subsequently translates this signal into a large-level signal. This large-level signal may also drive loudspeakers with low impedance. Determined by the type of amplifier, one of several types of elements are utilized in order to amplify the signal like tubes and transistors.

A few decades ago, the most popular type of audio amplifier were tube amps. Tube amps employ a tube as the amplifying element. The current flow through the tube is controlled by a low-level control signal. Thereby the low-level audio is transformed into a high-level signal. Tubes, however, are nonlinear in their behavior and are going to introduce a fairly large level of higher harmonics or distortion. Today, tube amps still have a lot of fans. The main reason is that the distortion which tubes cause are often perceived as “warm” or “pleasant”. Solid state amps with low distortion, on the other hand, are perceived as “cold”. Furthermore, tube amps have rather low power efficiency and thereby radiate much power as heat. Tube amps, however, a fairly expensive to manufacture and thus tube amplifiers have mostly been replaced with amps using transistor elements which are less expensive to make.

The first generation models of solid state amplifiers are often known as “Class-A” amps. Solid-state amplifiers utilize a semiconductor rather than a tube to amplify the signal. Typically bipolar transistors or FETs are being used. The working principle of class-A amps is quite similar to that of tube amplifiers. The primary difference is that a transistor is being utilized as opposed to the tube for amplifying the audio signal. The amplified high-level signal is sometimes fed back in order to minimize harmonic distortion. Class-A amps have the smallest distortion and usually also the smallest amount of noise of any amplifier architecture. If you require ultra-low distortion then you should take a closer look at class-A models. Though, similar to tube amplifiers, class-A amps have very low power efficiency and the majority of the power is wasted.

By employing a number of transistors, class-AB amplifiers improve on the low power efficiency of class-A amplifiers. The operating region is split into two separate areas. These 2 regions are handled by separate transistors. Each of those transistors works more efficiently than the single transistor in a class-A amp. The larger efficiency of class-AB amps also has 2 other benefits. First of all, the required number of heat sinking is reduced. For that reason class-AB amplifiers can be manufactured lighter and smaller. For that reason, class-AB amps can be made cheaper than class-A amps. When the signal transitions between the 2 separate areas, though, a certain level of distortion is being created, thereby class-AB amplifiers will not achieve the same audio fidelity as class-A amplifiers.

Class-D amplifiers are able to achieve power efficiencies higher than 90% by utilizing a switching transistor that is constantly being switched on and off and therefore the transistor itself does not dissipate any heat. The switching transistor is being controlled by a pulse-width modulator. The switched large-level signal needs to be lowpass filtered to remove the switching signal and get back the music signal. Both the pulse-width modulator and the transistor have non-linearities that result in class-D amps exhibiting larger music distortion than other kinds of amplifiers.

New amps include internal audio feedback to minimize the amount of audio distortion. “Class-T” amps (also referred to as “t-amplifier”) make use of this kind of feedback mechanism and for that reason can be manufactured very small while achieving low audio distortion.

A Quick Overview Of Music Amps

Requirements regarding audio power and audio fidelity of latest loudspeakers and home theater systems are continuously increasing. At the core of these systems is the audio amplifier. Recent music amps have to perform well enough to meet those ever growing requirements. It is tricky to select an amp given the big range of models and concepts. I will describe a few of the most common amp designs such as “tube amps”, “linear amplifiers”, “class-AB” and “class-D” in addition to “class-T amplifiers” to help you comprehend a few of the terms frequently used by amplifier makers. This article should also help you figure out what topology is perfect for your particular application.

An audio amp is going to convert a low-level music signal that often comes from a high-impedance source into a high-level signal that can drive a loudspeaker with a low impedance. As a way to do that, an amplifier utilizes one or more elements which are controlled by the low-power signal to create a large-power signal. These elements range from tubes, bipolar transistors to FET transistors. Tube amps used to be common several decades ago. A tube is able to control the current flow according to a control voltage that is connected to the tube. Tubes, however, are nonlinear in their behavior and are going to introduce a quite large amount of higher harmonics or distortion. A lot of people favor tube amplifiers since those higher harmonics are frequently perceived as the tube amp sounding “warm” or “pleasant”.

One downside of tube amps is their small power efficiency. In other words, most of the power consumed by the amplifier is wasted as heat rather than being transformed into audio. As a result tube amplifiers are going to run hot and require sufficient cooling. Yet another disadvantage is the big price tag of tubes. This has put tube amps out of the ballpark for many consumer products. Because of this, the majority of audio products these days makes use of solid state amps. I am going to describe solid state amplifiers in the following sections.

Solid state amplifiers replace the tube with semiconductor elements, typically bipolar transistors or FETs. The earliest type of solid-state amplifiers is known as class-A amplifiers. The working principle of class-A amps is quite similar to that of tube amplifiers. The primary difference is that a transistor is being used rather than the tube for amplifying the audio signal. The amplified high-level signal is sometimes fed back to minimize harmonic distortion. Class-A amps have the lowest distortion and usually also the lowest amount of noise of any amplifier architecture. If you require ultra-low distortion then you should take a closer look at class-A models. Though, similar to tube amps, class-A amps have extremely low power efficiency and most of the energy is wasted.

Class-AB amps improve on the efficiency of class-A amps. They use a number of transistors to split up the large-level signals into two separate regions, each of which can be amplified more efficiently. Because of the higher efficiency, class-AB amps do not need the same number of heat sinks as class-A amplifiers. As a result they can be manufactured lighter and less costly. Class-AB amplifiers have a disadvantage however. Each time the amplified signal transitions from one region to the other, there will be some distortion created. In other words the transition between these two regions is non-linear in nature. Consequently class-AB amplifiers lack audio fidelity compared with class-A amplifiers.

To further improve the audio efficiency, “class-D” amps utilize a switching stage which is continuously switched between two states: on or off. None of these two states dissipates power inside the transistor. Therefore, class-D amplifiers regularly are able to attain power efficiencies beyond 90%. The on-off switching times of the transistor are being controlled by a pulse-with modulator (PWM). Typical switching frequencies are in the range of 300 kHz and 1 MHz. This high-frequency switching signal has to be removed from the amplified signal by a lowpass filter. Typically a straightforward first-order lowpass is being utilized. The switching transistor and in addition the pulse-width modulator frequently exhibit rather large non-linearities. As a result, the amplified signal will have some distortion. Class-D amps by nature exhibit higher audio distortion than other types of mini stereo amps.

Newer amps incorporate internal audio feedback in order to reduce the amount of audio distortion. One type of audio amplifiers that uses this type of feedback is called “class-T” or “t amplifier”. Class-T amps feed back the high-level switching signal to the audio signal processor for comparison. These amplifiers have low music distortion and can be manufactured very small.

The Best Way To Pick The Most Reliable Wireless Speakers

Let me examine exactly how contemporary audio transmission systems that are utilised in today’s wireless speaker systems operate in real-world situations having a great deal of interference from other cordless devices.

The rising interest in cordless consumer gadgets including wireless speakers has begun to cause difficulties with several devices competing for the limited frequency space. Wireless networks, cordless phones , Bluetooth and also various other products are eating up the precious frequency space at 900 MHz and 2.4 Gigahertz. Cordless sound gadgets need to assure robust real-time transmission within an environment having a large amount of interference.

Common FM transmitters typically operate at 900 MHz and do not have any certain method of coping with interference but switching the broadcast channel is a solution to cope with interfering transmitters. Today’s sound systems employ digital sound transmission and frequently operate at 2.4 GHz. These digital transmitters broadcast a signal which takes up far more frequency space than 900 MHz transmitters and therefore have a greater potential for colliding with other transmitters.

Quite a few wireless products including Bluetooth products and also cordless phones incorporate frequency hopping. Thus just switching the channel will not avoid these kinds of frequency hoppers. Real-time audio has very strict requirements relating to stability and minimal latency. To be able to offer these, other means are needed.

One method is referred to as FEC or forward error correction. This approach enables the receiver to repair a corrupted signal. For this purpose, supplemental information is transmitted from the transmitter. Using this added data, the receiver can easily recover the original information even if the signal was damaged to some degree. FEC is unidirectional. The receiver will not send back any data to the transmitter. As a result it is often used by systems such as radio receivers in which the number of receivers is large.

Another method makes use of receivers which transmit information packets back to the transmitter. The information that is transmit includes a checksum. Using this checksum the receiver can determine whether any particular packet was received correctly and acknowledge. As lost packets must be resent, the transmitter and receivers must store information packets in a buffer. This is going to introduce an audio latency, also known as delay, to the transmission that could be a dilemma for real-time protocols including audio. Commonly, the larger the buffer is, the larger the robustness of the transmission. Video applications, however, require the sound to be in sync with the movie. In such cases a big latency is problematic. Wireless systems which use this approach, nonetheless, are only able to broadcast to a limited quantity of wireless receivers. Typically the receivers have to be paired to the transmitter. As each receiver also requires transmit functionality, the receivers are more pricey to make and in addition consume more power.

So as to better overcome interference, a few wireless speakers is going to monitor the available frequency band so as to decide which channels are clear at any given moment in time. If any particular channel becomes crowded by a competing transmitter, these products can switch transmission to a clean channel without interruption of the audio. The clear channel is picked out from a list of channels which has been identified to be clean. A technique that employs this kind of transmission protocol is referred to as adaptive frequency hopping spread spectrum or AFHSS

Solid Information About Cell Phones Which Are Easy To Understand

Cell phones are very difficult to understand sometimes. In spite of that, learning more will improve your experience with your cell phone. Are you wanting to get a phone that’s new, or do you just want to learn about phones? Keep reading and you will learn more.

You don’t really have to pay high costs to dial the information number with your cell phone. The best thing to do is dial 1-800-411-FREE. Then you will hear the info you need after a short advertisement.

Be careful if you watch videos while using LTE or 4G. Your monthly plan likely has data limits. Video can quickly go through the allowance and charge you more quickly. If this is a problem for you, consider switching to a different plan tailored to your needs.

Don’t always rush to update to the latest phone. Generally speaking, you won’t get much reward. Companies like to put out new phones often, but you’ll find that many times the updates are only minor. Wait a couple of weeks and check out what other people think about their purchase before you make a choice to purchase one. Most of the time, you don’t.

Don’t expose your cell phone to water. A lot of users accidentally drop their phone into water and damage it. Just keep it away from moisture. Even if you think that you will never drop it, accidents do happen.

Make sure your phone stays out of water. Dropping a phone in water can ruin it and lose all of your important data. Just keep your phone clear of all risk of getting wet. Though you may feel invincible, accidents are common.

Smartphones will slow down over time. Thus, you might find it harder and harder to update the phone’s software. When this begins to happen, you will need to make a decision. You can keep the status quo, and refuse any new updates, or upgrade your phone to a newer version.

Take time to find out the different applications you can do with your phone. Most recent models of phones are capable of surfing the web and playing music. You can also access a calendar function on many of them. Figuring out what goes into these programs is going to help you get a lot of use out of the money you spend.

Don’t let your phone get wet. Dropping a phone in water can ruin it and lose all of your important data. Ideally, don’t even place your phone anywhere near water. Though you may be careful, you want to avoid the chance of a costly accident.

If your sole purpose for getting a phone is for talking, you do not need a smartphone. Smart phones are great for web surfing and apps, but they aren’t needed for those that just need a phone for talking. Smartphones are much more expensive that your run-of-the-mill cell phone, and you don’t need to spend the extra money if you only want to talk.

Playing mobile games can cure boredom and add some much needed excitement to your day. You’d be surprised at the quality of the games out there for cell phones (get detailed infos here regarding motorola cell phones). Don’t overburden your phone with too many games, since this can eat up your memory.

Nowadays, everywhere you look you see cell phones. You may not be able to leave your home without your or see others outside without one. If you are thinking of buying a cell phone, there are a few things you should keep in mind. In this article, we have given you a broad overview. Use your new knowledge and apply it to your own life.