This page explains the DSP on the output side. These DSPs mainly perform signal processing for speakers (SP). Many output-side DSPs are used in sound systems* to process multiple SPs to produce a single sound. Although this page describes each DSP feature individually, it will be easier to understand if you understand how the output side of a sound system is designed. Please refer to this page regarding the output side design of the sound system.
* "Sound system" does not have a general or clear definition,
but on this page it refers to a system that needs to output a wide frequency range at a high volume.
* "Sound system" does not have a general or clear definition,
but on this page it refers to a system that needs to output a wide frequency range at a high volume.
Xorver (Crossover)
Xorver has two important roles.
Separating signals by frequency band In sound systems, the roles are often divided into an SP dedicated to low frequencies and an SP dedicated to high frequencies. In this case, the signal going to the low-frequency SP must include only low frequencies, and the signal going to the high-frequency SP must include only high frequencies. The role of Xorver is to isolate this frequency band.
Time Alignment Another important feature of Xorver is time alignment. This is a feature that delays the time passing through Xorver by very small amounts of time. Understanding why such a delay function is necessary requires some knowledge of waves. The reasons for this will be explained as simply as possible below.
By the way, it may be divided into 3 bands by Xorver.
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Filter (Output Fileter)
The output filter is used to cancel the frequency characteristics of the SP.
SP generally has unique frequency characteristics. To explain it in simple terms, the sound changes just by passing through the SP. Filters generally set characteristics that are opposite to those of SP and attempt to cancel them.
In more detail, the filter also has an inverse characteristic that cancels out the characteristics of the room. There is a room (space) between the SP and the listener, and the room also has its own frequency characteristics.
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Gain (Output Gain)
Delay
This function delays the input signal and outputs it. When SPs are installed in front and behind each other, there will be a slight difference in the time the sound output from both arrives at the listening point. In this case, the sound will sound like a duplicate. You will rarely hear two voices completely separated, but the clarity of the voices will be slightly lost. To prevent this, a delay is used to delay the sound output from the closest SP and to align the arrival times.
In reality, the delay time is often set so that the SP in front (the SP placed near the speaker) arrives a little earlier. This is because humans have the tendency to perceive sound images in SPs where sounds that arrive early are output. In other words, this is done as a device to direct the listener's attention in the direction of the speaker.
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