One of the major pitfalls of any wireless equipment is interference from other transmitters. To understand the issue better, I’m going to talk about setting up wireless speakers in some problems that can occur when there are other wireless devices in the area.
It doesn’t matter what type of wireless equipment you have, there will be interference between different devices if they work at the same frequency. As an example, wireless audio devices are much more susceptible to interference because they are strict requirements in terms of the audio latency which needs that the signal can be disrupted quite easily if there is a loss of signal for a certain amount of time.
Wireless speakers typically solve these issues by employing advanced frequency hopping which typically avoids frequency channels that are occupied by wireless routers. Other types of wireless audio device such as wireless subwoofers or outdoor speakers usually use a fixed frequency for transmission. Fixed-frequency transmitters have the advantage that it is easier to coordinate between different devices working in the same neighborhood.
However, the problem arises when they are frequency hopping devices in the area. Even though, frequency hopping devices don’t require frequency coordination between several devices, they constantly change frequency and thus collisions with other transmitters are unavoidable. However, since they hop frequencies often, only if you packets …
In this article, I will focus on power supplies. In particular, I will discuss which types of power supplies are suitable for driving audio products. The main two groups of power supplies are linear power supplies and switched-mode power supplies. The operating principle of each of these types of power supplies is quite different.
The linear power supply uses a transformer which converts the alternating current that is supplied by the mains power into another alternating voltage. This voltage is then rectified by one or multiple rectifying units and finally stabilized by voltage stabilizers.
In contrast, switched-mode power supplies first rectified the alternating voltage into a DC voltage. This is done by a rectifier which is located right at the input of the power supply. Then this voltage is being chopped into a switching waveform by using a MOSFET transistor. This MOSFET transistors connected in series with the transformer. At the secondary side of the transformer is another rectifier which converts the alternating voltage into a DC voltage. Some models of switch-mode power supplies have multiple secondary coils in order to generate multiple voltages. Each of these voltages are rectified as well. Finally, the resulting voltage is being filtered and output.
The reason for designing switched-mode power supplies is the higher power efficiency and also the smaller size. Because the frequency …
If you own some expensive audio equipment then you might be wondering whether it was worth spending all this money. The easiest way to verify the performance of some equipment is to read a review in a magazine. Magazine publishing houses usually have audio test equipment and people which are well trained in using the equipment. Also, the specification sheet of your device will give you some indication of the performance. However, some parameters are not very well standardized. As an example, the wattage rating of an amplifier is not very well defined. Some manufacturers will rate the maximum wattage that can be output during a short burst of time while other manufacturers will provide the wattage that can be sustained by the amplifier for an extended amount of time such as several minutes.
Audio distortion also is highly dependent on several criteria. Ideally, you should have distortion given versus wattage. As the wattage increases, audio distortion will increase as well. At some point clipping will occur and the distortion will shoot up tremendously. In addition, audio distortion of an amplifier typically varies versus frequency. The higher the frequency typically the higher the distortion will be. Another important criterion which is typically not published in specifications sheet is the intermodulation distortion. In order to determine this value, you typically would have …