An audio processor, also known as a digital processor, is a process for processing digital signals. The internal structure is generally composed of an input portion and an output portion. Its internal functions are more complete, and some have processing modules that can be dragged and programmed, which can be composed of users freely built systems.
Audio processor featuresInput function introduction
Audio Processor Software Interface Input Gain: Controls the input level of the processor. Generally adjustable range is around 12 decibels.
Input equalization: Most digital processors use 4-8 full parametric equalization. There are 3 internal adjustable parameters, which are frequency, bandwidth or Q value and gain.
Input Delay: This function is to make some delays when the input signal of this processor is entered. Generally, the overall delay adjustment is made when the processor and the speakers it controls are used as auxiliary.
Input polarity conversion: It can change the polarity phase of the whole processor between positive and negative, saving you from changing the line.
Output function introduction
Signal input distribution routing (ROUNT): The function is to let this output channel choose which input channel to accept the signal, generally can choose A (1) input, B (2) input or mixed input (A + B or mix Mono), if you choose A, then the signal of this channel comes from input A, and does not accept the signal of input B. If A+B is selected, then there will be a signal coming in regardless of which signal is present in A or B.
High-pass filter (HPF): This is used to adjust the lower limit of the frequency of the output signal, such as adjusting the lower crossover point of the speaker. The internal is usually composed of three parameters, one is the frequency, which is used to select the desired lower frequency limit. The other is the filter form, there are generally three kinds, LR, BESSAL, butworth, if you don't understand, choose LR, the third parameter is the filter slope, generally 6,12,18,24,48dB/ OCT is a few, too deep, I don't say much. The meaning of this slope is that the larger the value you choose, the cleaner the score.
Low Pass Filter (LPF): It is used to adjust the upper frequency limit of the output signal, such as controlling the upper crossover point of the subwoofer, and the internal adjustment content is the same as HPF.
The combination of HPF and LPF is a bandpass filter, such as an external 3-way speaker with a crossover point of 500/3000 Hz, then the LPF of the bass channel is 500, the HPF of the midrange is 500, and the LPF is 3000. The HPF of the high-pitched channel is 3000, the filter format is LR, and the crossover slope is 24, which is generally correct.
In addition, some processors combine the filter form and the crossover slope as options.
Output equalization is generally the same as input equalization, except that general output equalization is only parametric equalization, and there is no option to illustrate equalization.
The output polarity adjustment is the same as the input section. It is used to convert the polarity of the output signal. Some processors also have a phase angle (PHASE) adjustment at the output. This is a bit deep, I will not say much.
Limiter at the output: Generally there are 3 adjustable parameters, which are the start level, start time and recovery time. The adjustment of the startup level is based on the characteristics of the amplifier and the speaker. Generally, under normal circumstances, the control does not allow the amplifier to emit a red light. The startup time and recovery time are selected according to the frequency, the low frequency is slowly recovered with a slow start, and the high frequency is quickly recovered with a fast start. , the middle frequency is in the middle.
The role of the dsp audio processorAs automotive applications become more electrically and electronically controlled, digital signal processing will spread throughout the car. In automotive signal processing systems, energy efficiency and high speed operation play a large role in overall performance. The DSP is a dedicated processor designed to handle high-density, repetitive data. The traditional processor is far less than the speed of the DSP processor, and it is inferior in function. It cannot exceed the DSP processor of high-tech.
Traditionally, GPP has adopted Feng. In the Neumann memory structure, the program shares a memory space with the data, and a common set of buses (an address bus and a data bus) are linked to the processor core. Although the typical high-performance GPP now includes two on-chip caches (one data, one instruction) directly connected to the processor core to speed up the runtime access. The wide application of new technology has made tuning into a new era, bringing you a new field of perfect sound quality. It marks the end of the era of distorted old generation audio processors. Unparalleled signal-to-noise ratio and ultra-low distortion are the result of technological innovations. The DSP audio processor can be operated by computer and is very simple to operate.
At present, there are not many audio processors with DSPs on the market, and major brands have launched one or two DSP audio processor products, and there has not been a large-scale product launch. The future market of DSP audio processors is still to be further developed. Now let's take a look at some of the popular audio processors on the market that are recommended for you.
Abstract: Car audio and DSP technology have an inseparable relationship. The data processing capability of DSP digital signal processing technology is not comparable to that of a general processor. For the first-time audio enthusiasts, how to fully understand and understand the functions of the DSP processor is the first priority. In recent years, affected by foreign audio conversion, domestic car audio modification has become popular. In order to enrich their car life and highlight their unique personality, more and more car owners began to pay attention to and experience the audio upgrade modification. With the increasing innovation of technology, various digital audio and video technologies are increasingly used in automobiles. DSP digital signal processing technology provides a high performance programmable processor for signal processing applications, characterized by flexible applicability, low power consumption, high efficiency and low cost. To provide consumers with high-priced products to solve urgent needs.
What is a DSP processor?
DSP (Digital Signal Processing) is a unique microprocessor that processes digital information with digital signals. It works by receiving an analog signal and converting it to a digital signal of 0 or 1. The digital signal is modified, deleted, and enhanced, and the digital data is interpreted back into analog data or the actual environment format in other system chips. Not only is it programmable, but it can run tens of millions of complex instructions per second in real time, far surpassing general-purpose microprocessors, and is an increasingly important computer chip in the digital electronics world.
The DSP processor can control the digital signal with a fixed program, and use the strength of the frequency to create the sound field effect, and the auditory environment creates a feeling like in the space of the opera house. Or it can also modify the style of music into Jazz, Pop and other music types. Its powerful data processing capabilities and high operating speed are two of the most commendable features.
DSP has several advantages: 1. It is not sensitive to the tolerance of component values, and is less affected by external factors such as temperature and environment; 2. Easy to integrate; 3. VLSI can be time-multiplexed and shared processor; 4. Easy to adjust The coefficients of the processor implement adaptive filtering; 5. Functions that cannot be realized by analog processing: linear phase, multi-sampling rate processing, cascading, easy storage, etc.; 6. Can be used for signals with very low frequency. What are the advantages of digital signals compared to analog signals?
First of all, let's first understand these two terms, what is a digital signal? What is an analog signal? An analog signal is information represented by a continuously varying physical quantity whose amplitude, or frequency, or phase of the signal changes continuously with time, such as a currently broadcasted sound signal, or an image signal. Digital signals mean that the magnitude of the amplitude is discrete and the amplitude representation is limited to a limited number of values. A binary code is a digital signal. The binary code is less affected by noise and is easy to be processed by digital circuits, so it has been widely used.
There are two main disadvantages of analog signal communication: (1) poor confidentiality: analog signal communication, especially microwave communication and wired open line communication, is easily eavesdropped. As long as the analog signal is received, it is easy to get the communication content. (2) Weak anti-interference ability: The electrical signal will be interfered by various noises inside and outside the communication system during the transmission along the line. It is difficult to separate the noise and signal, which makes the communication quality degrade. The longer the line, the more noise is accumulated.
Digital signals make up for the insufficiency of analog signals. The advantages of digital signal communication are: 1. The superiority of digital transmission and exchange. The signal form of digital communication is consistent with the signal used by the computer, and is a binary code. Therefore, it is convenient to be networked with a computer, and it is also convenient to store, process and exchange digital signals by a computer, so that the management and maintenance of the communication network can be automated and intelligent. 2. Strengthened the confidentiality of communication. Encryption processing of digital communication is much easier than analog communication. Taking a voice signal as an example, a digitally converted signal can be encrypted and decrypted by a simple digital logic operation. 3. Improve the anti-interference ability. Since the amplitude of the digital signal is a finite number of discrete values ​​(usually taking two amplitudes), although it is also interfered by noise during transmission, when the signal-to-noise ratio deteriorates to a certain extent, that is, the decision regeneration is performed at an appropriate distance. The method generates a digital signal that is the same as the original transmitting end without noise interference, so that long-distance high-quality transmission can be realized.
Difference between DSP processor amplifier and ordinary power amplifier
Power amplifier with DSP processor refers to the use of DSP chip, which can be adjusted by computer, the parameters of each channel (EQ delay crossover point, etc.), it is better to manage the power amplifier through the computer. The DSP power amplifier has the functions of other power amplifiers; it can attenuate the overlapping frequencies of the interior environment, add the frequency of the environment attenuation, and adjust the distance between each speaker and the human ear in the car; DSP amplifier can adjust the defects that can not be adjusted in the car!
The DSP microprocessor (chip) of DSP power amplifier generally has the following main features: 1. One multiplication and one addition can be completed in one instruction cycle; 2. The program and data space are separated, and the instruction and data can be accessed simultaneously; 3. On-chip Fast RAM, usually accessible in two blocks over a separate data bus; 4. Hardware support with low or no overhead loops and jumps; 5. Fast interrupt handling and hardware I/O support; Multiple hardware address generators operating in a single cycle; 7. Multiple operations can be performed in parallel; 8. Pipeline operations are supported, allowing operations such as fetching, decoding, and execution to be performed in an overlapping manner.
Compared with ordinary power amplifiers, it is obviously a lot better. Ordinary power amplifiers can only be adjusted: gain, high and low pass, and can not be connected to the computer. The DSP amplifier can better manage the amplifier through the computer. DSP amplifiers have several advantages that are not available in ordinary power amplifiers: 1. Integrating the DSP module into the amplifier saves wire cost and wire interference, as well as saving installation space in the car. 2. Power amplifier with dsp function is very convenient to do active crossover, delay processing, EQ tuning, so that the car's complex environment can be improved, so that the sound of the sound is more resistant to listening!
DSP technology application and host
As technology matures, manufacturers have been able to improve the performance and usability of digital car audio equipment. By operating in the sideband and intermediate frequency (IF) signals of automotive entertainment systems, digital signal processors (DSPs) have evolved automotive radios from the original single audio processor into a sophisticated high-tech information and entertainment center. DSP has an irreplaceable importance in the field of digital signal processing due to its own characteristics. Car radio digital signal processing is a technology that infiltrates digital media into car radios.
The DSP host in the market has become a trend this year. The car DSP can provide a higher level of functions on a single chip, and the DSP chip in the car audio source is implanted into the host, which refines the very important crossover network and delay. system. It may be the cost reason. It also simplifies the number of EQ bands and has a Q-value adjustment. It is not difficult to adjust a set of competition-level systems with these DSP functions. In addition, the DSP system provides an extended listening range for car radios, allowing users to accept more stations in a wider range without the need to constantly adjust the radio for better reception. The DSP will make the traditional analog AM and FM broadcasts clearer, with better sound quality and lower interference.
Future DSP development trends
With the application of DSP in the field of communication, digital audio and video products will become more and more popular, making the relevant market demand more and more, the future DSP market competition will become increasingly fierce. Although the market for DSP's main application products is controlled by international semiconductor manufacturers, local manufacturers are actively investing in research and development resources, and consumer products as a stepping stone to enter the DSP market will also gain a place in the DSP market.
Digital signal processing (DSP) technology has been, is, and will play an indispensable role in it. The development of DSP devices must take into account the factors of 3P, namely performance, power consumpTIon and price. In general, with the rapid development of VLSI technology, modern DSP devices continue to maintain performance and power consumption per unit of computing while the price is significantly declining.
The convergence of DSP and microprocessor will be one of the future trends. Microprocessors are low-cost, and general-purpose processors that perform intelligent directional control tasks can
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