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Linux Audio-driven Learning: (1) ASOC analysis

and reuse in the software world, the audio system of embedded devices can be divided into onboard hardware (machine),Soc (Platform), codec three parts, as shown: ①machine refers to a machine, can be a device, a development board, or a smart phone, it can be seen that machines are almost non-reusable, each machine hardware implementation may not be the same, the CPU is not the same, Codec different, audio input, output devices are not the same, machine for the CPU, CODEC, input provides a carrie

WIN8 System computer speaker equipment play music a ring how to solve

the speakers of the connection line is bad contact, loose and other phenomena. If the problem is still not solved, it is a faulty computer audio, or a computer card is faulty. Workaround Three: If the sound card setup problem, please open the Control Panel of your sound card settings interface (or double-click the system tray Small horn icon), check the channel balance is in the middle, if not, please adjust the left and right channel balance to the middle. Workaround

What is the reason that the computer speaker has current sound?

Many kinds of situation can cause the sound box to have the noise, for instance the speaker is disturbed, the interface or the connection line contact is bad, the sound box itself quality is inferior and so on. Generally speaking, the speaker is a lot of active speakers, its internal will certainly exist amplifier, so the noise is unavoidable, the source of noise from the source can be roughly divided into electromagnetic interference, mechanical noi

Why does the computer speaker have current sound?

Netizen consults the author said: His computer speaker recently suddenly appeared the noise, is the current sound, does not open any music has, the volume is bigger, the murmur is also big, before has been good, suddenly has been so, is the speaker bad, why does the speaker have the current sound? What if the speaker has current sound? Many kinds of situation can cause the sound box to have the noise, for instance the speaker is disturbed, the interface or the connection line contact is bad, th

Computer network Learning Notes--Physical layer (2) __ Network and communication

physical layer, which is not the same as the "frame" of the data link layer that will be discussed at a later time, and cannot be confused. 3, Wavelength Division multiplexing WDM (Wavelength division multiplexing) Wavelength division multiplexing is the frequency division multiplexing of light. Because of the high frequency of the optical carrier, it is customary to use wavelength rather than frequency to express the use of more than the optical carrier, so that the use of Wave Division mult

What are the common shortcut keys for Windows?

If we learn to use shortcut keys, then we will improve the speed of operation and work will be efficient. Windows commonly used shortcut keys have a quick lock screen, quickly open the Explorer, directly display the desktop, quickly turn off the page, restore the closed page, delete operation, text picture amplifier, etc., the following small series for you to introduce several Windows shortcut keys, I hope to help everyone. 1. Quick Lock Screen Wan

What happens when the computer suddenly doesn't sound?

normal. If the above check is correct, the computer suddenly no sound is most of the equipment problems, such as headphones on the volume control is inadvertently transferred to the minimum or the headset is damaged, if it is the amplifier, it may be bad or the connection between the computer and contact bad or damaged, Before the company appeared the computer and the power amplifier between the audio lin

3G Indoor Coverage Analysis

frequency band mostly covers the 800~2500mhz, no need to change. Increase 3G in the signal source part of the use of dual-frequency or multiple-frequency coupler to the signal after the road (for the downlink is closed, for the uplink is shunt) sent to the distribution system can be completed. For large buildings, signals in the transmission and distribution process, the signal is low to a certain extent need to use the trunk amplifier to amplify th

< turn >nios II embedded System hardware design (I.)

cycles, depending on the clock frequency depends on the value. The ezniosdk user can choose 20ns. In fact, pre-charging is a data rewrite of all the storage in the work line, and the line address is reset, while releasing the inside of the chip comparator (re-added to the comparator voltage , usually the capacitor voltage to help determine the logic level of reading data), To prepare a new line of work. Specifically, the data in the amplifier / Drive

Typical Fault solutions for hardware incompatibility

, but the power supply current is limited to ma. 14. The headset is incompatible with the sound card or motherboard. Sometimes, after you plug in the headset, you find that the sound of the headset is very small and cannot be used normally. There are two situations: (1) earphone Impedance The earphones we normally use are 8 ohm impedance headphones. If we purchase high-impedance headphones or other special-purpose headphones, we will feel a little sound when plugged into the computer, even if yo

Poj 1185 Artillery Position status compression DP

indicates the amplifier. In the same way, the hardware conditions must be met first, that is, some places cannot be the amplifier, then, there cannot be two 1 distance less than two in each row (to ensure that they do not attack each other). These must be handled in advance. Then there is the State representation and transfer problem. Because it is related to the status of the first two rows, a three-dimen

Signal Processing Circuit for ZZ Infrared Focal Plane Array

......, TN is the N headers of the input signal. The main function of siccd-MUX is to combine multiple lines (16, 32, 64, 128, 256,…) in the infrared thermal imaging system ,... ) Infrared detectors and line output signals are converted to serial output signals. Its main advantages are low noise, high sensitivity, and high working frequency. Since all input signals are output through a low-noise, high-sensitivity charge detector, the non-uniformity of output signals is easier to solve. Siccd-MU

Weisheng-hardware test questions

Hardware test questions1. What is the content of kilhov's theorem?Kikhov's law includes current law and voltage law.Current law: the algebra and constant of the branch current of all outgoing nodes at any time point in the set total circuit are equal to zero.Voltage law: in a set-sum circuit, the voltage algebra and the constant are equal to zero at any time and along any loop.2. Describe the concept of feedback circuit and list their applications.Feedback is to input the power in the output cir

Understanding successive approximation register ADC: Architecture comparison with other types of ADC

. Pipeline ADC generally requires more Silicon Wafer area than SAR of the same level. Like SAR, a pipeline ADC with a precision higher than 12 bits usually requires some form of fine-tuning or calibration. Compared with the flash ADC The flash ADC consists of a large number of comparator, each of which includes a broadband, low-gain pre-amplifier, and latches. The pre-amplifier must be used only to provide

Application of Digital microphone and array sound pickup Technology

of the microphone (see Figure 1a ). The ECM digital microphone is usually composed of a vibrating film, a back plate, a digital microphone chip, and a shielded housing. The digital microphone chip is mainly composed of a buffer level, a zoom-in level, a low-pass filter, and anti-modulus conversion. Buffer-level Impedance Transformation, amplification-level amplification of signals, low-pass filtering to filter out high-frequency signals, prevent mixing of Analog-to-analog conversion, analog-to-

ADbox106G-V advertising machine control (dual core 2160 P)

Function Overview ADbox106G-V advertising machine control board, integrated multimedia decoding, LCD driver, Ethernet, HDMI, WiFi, 3G, camera in one, support most of the currently popular video and image format decoding, supportHDMI/VGA video output, Dual 8-bit LVDS Driver, can drive a variety of tft LCD display, greatly simplifying the system design, is very suitable for HD network terminal box, video advertising machine and frame advertising machine.Features ◆ High integration level. Integra

Linear Power Supply and Switching Power Supply

(1) Concepts A Linear Power Supply typically samples the output voltage and sends it to the Compare voltage amplifier with the reference voltage. The output of this voltage amplifier serves as the input of the Voltage Adjustment tube, it is used to control the adjustment tube so that its junction voltage changes with the input, so as to adjust its output voltage. However, the switching power supply changes

Common sense concepts such as sound, audio sampling rate, and Sampling Accuracy

What is EQ? The value range is-15db-15db. BTL principles (Bridge-tied-load) indicates a bridge load. The two ends of the load are connected to the output ends of the two amplifiers respectively. The output of one amplifier is the image output of another amplifier. That is to say, the signal added at both ends of the load is only 180 ° different in phase. Load will generate 2 times the volt

Debug wm9714 audio channel Switching

The switching between the earphone and the Horn channel of wm9714 is controlled by the register software, which is a little different from the method of inserting the earphone in the TV to let the amplifier pull down and turn off the external sound directly. You can set the value of 0x1c in wm9714, where 0x00a0 and 0x1200 in the headset. In the circuit, the eint11 is fixed externally to a high level. The eint11 is lowered by inserting a headset to tri

The realization of the intelligent body fat weighing scheme

I. Overviewas people live more and more attention to the quality of life, the emergence of intelligent body fat can be measured by measuring body fat, body moisture, body weight, and a series of data to provide users with reference. To achieve the goal of testing fitness outcomes or health indicators. Two. Power supply circuit designPower circuit design: Powered by four 1.5v fifth battery. The voltage regulator chip provides 3.3v to the MCU, while the MCU pin monitors the battery charge change.

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