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  • Ten Daily Electronics Common Sense-Section 136

    What is real-time 3D visualization?

    Through real-time 3D visualization, the water environment information can be effectively and intuitively presented to experts as the basis for qualitative decision-making by the expert group.
    How to make the constructed 3D scene reflect the current water environment in real time;
    How to organize water environment information and graphic information to improve the speed of graphic display and data query;
    How to quickly display the 3D scene to the expert group on the client side is a key problem that needs to be solved.

    What are the main technical features of the MAX6966?

    • With high-speed 26MHzSPI/QSPI/MICROWIRE compatible serial port;
    • 2.25~3.6V working voltage;
    • When the power is turned on, the I/O port defaults to a high-impedance (LED off) state;
    • I/O port input overvoltage protection The value is 7V;
    • I/O port output is an open-drain output with a rated voltage of 7V;
    • I/O port output is 10mA or 20mA constant current, static/PWM or open-drain logic output;
    • Each output is an independent 8-bit PWM Control, any output can use or not use PWM control, each output independent l-bit analog control (half/full);
    • Schmitt logic input with overvoltage protection;
    • Exit with simple two pulses Shutdown (hot start), automatic ramp down when entering shutdown, automatic ramp up when waking up from shutdown;
    • Built-in analog and switch white LED brightness control, global 3-bit analog control for all LED outputs;
    • The typical value of shutdown current is 0.8.

    What are the CAN test content?

    1. CAN bus test is generally divided into two parts: single node test and bus system integration test.
    2. CAN bus test can be divided into physical layer test, data link layer test, application layer test and so on according to the communication level.

    What are the benefits of the system code?

    The benefit of systematic codes is that some received source symbols can be used directly by the receiver without decoding.
    Even in the case where the source block cannot be decoded, the original data in the first k symbols can still be passed to higher layers, where errors are handled by error concealment algorithms.
    At the receiving end, the receiver can decode the source block as long as it receives enough data packets (source or repair).
    If the receiver cannot receive enough packets to decode the entire source block due to multiple packet losses, it passes only the decoded part of the source block to higher layers.

    What is the goal of software design for terminal nodes?

    Data acquisition of analog input and switch input through C language. That is to collect parameters from electrical equipment in power grids and substations. And classify and process the data, so as to grasp the operation status of the substation and the status of the electrical equipment in the station. At the same time, it receives the dispatching command and closes the switch to achieve the purpose of monitoring and control.

    How to design a fast data exchange mechanism for multi-DSP digital controllers?

    There are many kinds of fast data exchange mechanisms in common implementation methods.
    Shared memory is the most commonly used method. Using dual-port or multi-port RAM for data exchange between DSPs is generally considered to be the most efficient and simple implementation method, and it is also the most common implementation method.

    What are the main technical indicators of stepper motors?

    1. Working voltage
    2. Winding current
    3. Rotating torque
    4. Holding torque
    5. Detent torque
    6. Step angle
    7. No-load starting frequency
    8. No-load running frequency
    9. Accuracy
    10. Surface temperature
    11. Excitation method

    The amount of information transmitted by the tag also directly affects the polling time.Therefore, what are the main considerations for achieving time validity?

    • Reduce signal conflicts so that the information returned by the tag is wasted as little as possible;
    • The tag sends less information (such as one bit) instead of the entire ID, reducing transmission time.

    How to easily identify common varactor diodes?

    The varactor diode is a special diode specially designed according to the principle that the junction capacitance of the “PN junction” inside the ordinary diode can change with the change of the external reverse voltage.
    Varactor diodes are mainly used in high-frequency modulation circuits of mobile phones or landlines in cordless telephones to modulate low-frequency signals to high-frequency signals and transmit them.
    In the working state, the modulation voltage of the varactor diode is generally added to the negative pole, so that the internal junction capacitance of the varactor diode changes with the change of the modulation voltage. The failure of the varactor diode is mainly manifested as leakage or poor performance:
    (1) When leakage occurs, the high-frequency modulation circuit will not work or the modulation performance will deteriorate.
    (2) When the varactor performance deteriorates, the operation of the high-frequency modulation circuit is unstable, so that the modulated high-frequency signal is sent to the other party and is distorted after being received by the other party.
    When one of the above situations occurs, the varactor diode of the same type should be replaced.

    What are the TV encoder related registers?

    • TV Controller control SFR set
    • Vertical back porch end point
    • Horizontal back porch end point
    • Horizontal enhancer offset
    • Vertical demo window size
    • Horizontal demo window Size
    • Input image size
    • Encoder pedestal control
    • Y/C filter bandwidth control
    • HUE control
    • Sub Carrier Frequency control
    • Fsc DTO manual control
    • Background control
    • Background VAV & HAV control
    • Contrast & Bright control
    • Cb & Cr gain control
    • Demo window control
    • Flesh tone control
    • Black & White stretch gain control
    • Sharpness control
    • Gamma control
    • FSC auxiliary control
    • Sync size control
    • Burst signal control
    • Macrovision burst signal control
    • Active video position control
    • Encoder control


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