The full English name of E.I.D.C. is Edifier Intelligent Distortion Control, which is the Edifier intelligent distortion control system. It has applied for patents in many countries such as China and the United States. EIDC uses a single-chip microprocessor to collect and calculate the distortion of the power output, and automatically controls the gain of the amplifier to achieve high and low level input compatibility with different sound sources, avoid hardware damage, and protect your hearing.
Example
Edifier mobile series M3 (foreign model is MP300) is the first product to adopt EIDC technology. EIDC is a technology that can be seen and heard in it. . You can try this by adjusting the output of the sound card to the maximum, playing some powerful music, and then pressing the volume of the M3 to the maximum (see the power indicator light flashing quickly). At this time, the sound may become very noisy. , that is, obvious distortion appears. Please keep watching the indicator light, and you will find that the indicator light will flash several times. This is EIDC automatically controlling the gain of the speaker according to the degree of distortion. Each time the indicator light flashes, it indicates that the speaker gain has been adjusted. After a while, the sound from the speakers became less noisy, and basically no obvious distortion was audible. Detect and collect distortion;
Use a single-chip micro central processing unit (MCU) and an optimization algorithm in software programming to calculate parameters;
MCU controls and adjusts the gain of the amplifier .
EIDC application block diagram in multimedia speakers
In the block diagram, input, preamplifier circuit, volume adjustment, postamplifier circuit, and speakers are the main working components of conventional multimedia speakers. The EIDC system adds an MCU intelligent processor, a distortion and wave type detection circuit, an adjustment operation interface, and changes the ordinary analog volume adjustment to a digital volume potentiometer IC. The distortion and wave type detection circuit samples from the final output of the power amplifier and converts the distortion signal into a pulse width signal for MCU acquisition and calculation. The main control program of the MCU uses an optimization algorithm to determine whether the distortion exceeds the limit, and makes correction instructions to control the electronic volume integrated block through the I2C bus to achieve the purpose of controlling the overall gain of the amplifier. EIDC technology uses the detection and collection of parameters such as distortion, and uses distortion as the basis for adjustment and control. This is different from conventional voltage negative feedback circuits and current negative feedback circuits, which use the output voltage or current value. Since the speaker is an inductive load, coupled with the instantaneous music signal with complex frequency changes, it is difficult to reflect the actual output power, distortion and temperature characteristics of the amplifier using the output voltage or current. EIDC uses distortion as an intelligent control to ensure the quality of the output sound and avoid damage to the power amplifier and speaker system.
EIDC uses a single-chip micro central processing unit (MCU) and an optimization algorithm in software programming to calculate parameters. Due to the MCU programming used, optimized software algorithms can be used to achieve distortion collection, replacing expensive and complex hardware circuits and complicated hardware debugging work. The parameters in the control algorithm can also be flexibly adjusted. For products of different levels, the software algorithm can also be modified appropriately.
The electronic volume integrated block is used to connect to the MCU through the I2C bus or other IO methods, so that the MCU can intelligently adjust the gain according to the needs of the system.
EIDC control is different from ordinary AGC automatic gain control. AGC generally uses the output voltage as feedback to control the gain of the amplifier, and its function is continuous and single adjustment. The EIDC uses distortion as a basis to intelligently control the amplifier gain. Due to the use of MCU software algorithms, it can achieve integral or segmented adjustments. It is not a continuous gain adjustment, but based on the actual analysis of the system, at the appropriate time. Time to make appropriate adjustments, completed without the user knowing it. This can avoid the problem of loud and soft sounds that AGC is prone to, and ensure the dynamics of the original music.
EIDC achieves compatibility with high- and low-level inputs from various sound sources through intelligent control of amplifier gain, ensuring low sound distortion and avoiding damage to the product system. "Distortion" in the traditional sense refers to the excessive gap between photos and pictures and reality, such as the wedding photos, artistic photos, personalized photos we see, etc.; on the other hand, it refers to the difference between the processed sound and the original sound. difference between.