In recent years, the KTV entertainment model has undergone major changes, which has led to the popular trend of using pre-amplifiers and post-amplifier applications, triggering a "karaoke effect boom" in the entertainment industry. !
Karaoke effects are mainly divided into two types: analog and digital (DSP). Which one is better than others? Different manufacturers have their own opinions based on their own interests. After all, end users are unavoidably biased. The author has been engaged in the research and development of karaoke effects for a while, and has done different digital and analog solutions. Here, I will only talk about the views with my personal experience, and report my research and development results to everyone.
A digital effect
The digital effect processor uses DSP chips to achieve a full range of functions. Not only the effects of various microphone signals (such as delay, echo times, reverb, pre-delay time, etc.) can be completed on one chip, but also It can also develop and utilize functions such as equalization, frequency shifting, amplitude limiting, amplitude limiting, frequency division, and transposition. In the eyes of ordinary people, digital effects are almost perfect. Manufacturers and merchants have enough "selling points". There are too many reasons for users to be dazzled. Many people think that the complicated menus and operation modes of digital effects are " high tech".
Digital effects are undoubtedly the future direction of development. In recent years, there has also been considerable progress, but the technical bottleneck in front of them cannot be completely broken through. There are two main constraints:
1 At present, the purchase of high-quality chips is limited, and the technology development platform is not enough. As far as signal fidelity is concerned, it is very sad to just switch between "digital" and "analog". "", "Dead". !
2 The development of a digital effect device must start from the "bottom layer" of the DSP chip. How the "algorithm" is critical is critical to software engineers. If the engineers engaged in the development of effect software do not have sufficient cultivation of music and have no thorough research on analog circuits, they can only "blindly touch the elephant" in the end, and can make the tail of the elephant, but the whole is an elephant, a cow, a horse It is unknown. At present, there are extremely few talents capable of combining technology and art in China. Most manufacturers share a few DSP effect modules for secondary development.
Two analog effects
The earliest domestic analog effect device appeared in the early 1990s, at that time, the front part of the merger was removed, called "karaoke pre-stage".
There are many effect chips that can be selected for the G analog effect device. Commonly used are: 2399, 65831, 56031, 50195, etc., but the quality is very different, and the application difficulty is different from the final effect performance. The analog effect chip has few functions, and there are not many parameters that can adjust the microphone signal. There are only three types of delay time, number of repetitions, and depth of reverberation (effect volume).
The cost of analog effects is low, easy to use, and the sound quality is basically feasible in terms of karaoke with low requirements, and there will be a certain market in the future; but its inherent birth defects are obvious.
1 The function of traditional analog effect device is too simple, users think that there is no "new idea" that the grade is too low; manufacturers and merchants can't come up with "selling point" lack of profit space, in a word: people are old and yellow.
2 The microphone effect processing of the analog effect device is subject to the chip, and there is not much room for the R & D engineers to play. Everyone thinks that the current product seems to have reached the apex of technical maturity. Some defects that have not been overcome have hindered the progress of the analog effect device. 65831 is the most used chip for analog effects. The application is very simple. As long as the peripheral circuits recommended by the supplier are copied, there will be no errors and the sound will be soft and warm; The brain rustle. 56031 is actually "Taiwan version of 65 831", which is not as good as 65831 except for its low price. The 50195 peripheral circuit is complicated, and it is far inferior to 65831 with a little care in design. It is difficult to apply, so most manufacturers are reluctant Optional; the fidelity and clarity of the 50195 chip is the best among the current analog effect chips, but the fullness of the sound is not enough, the high frequency band is also easy to break, and the supporting memory 4164 is easy to damage, causing machine failure The rate is high. In general, the response speed of the analog effect device is slow. The main advantage is that the microphone effect is soft and easy, but it has obvious disadvantages of insufficient fidelity, clarity, and permeability, and is only suitable for small space occasions. Now KTV rooms are getting bigger and bigger, the decoration materials are generally harder, and most of them are equipped with professional speakers. At this time, the analog effect is certainly not enough.
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