Location:
Search - digital radio
Search list
Description: 设计一个具有时、分、秒计时的电子钟，按24小时计时。要求：
（1）数字钟的时间用六位数码管分别显示时、分、秒；
（2）用两个控制键，对数字钟分别进行分、时校正；
（3）具有仿广播电台整点报时的功能。即每逢59分51秒、53秒、55秒及57秒时，发出4声500Hz低音，在59分59秒时发出一声1kHz高音，它们的持续时间均为1秒。最后一声高音结束的时刻恰好为正点时刻。
（4）具有定时闹钟功能，且最长闹铃时间为1分钟。要求可以任意设置闹钟的时、分；闹铃信号为500Hz和1kHz的方波信号，两种频率的信号交替输出，且均持续1秒。设置一个停止闹铃控制键，可以停止输出闹铃信号。
（5）输入时钟脉冲的频率为50MHz。(Design an electronic clock with time, minutes and seconds, and time by 24 hours. Requirements:
(1) the time of digital clock is shown with six digital tubes, respectively, minutes and seconds;
(2) two control keys are used to divide and adjust the digital clock respectively.
(3) it has the function of imitating radio station. That means that at 59 minutes, 51 seconds, 53 seconds, 55 seconds and 57 seconds, a 4 500Hz bass is emitted. A 1kHz note is emitted at 59 minutes 59 seconds, and their duration is 1 second. The end of the last treble is exactly the moment of truth.
(4) it has a timer function and the longest alarm time is 1 minute. Ask to set the alarm clock at any time. The alarm signal is a square wave signal of 500Hz and 1kHz. The signals of both frequencies alternate and output for one second. Set a stop alarm button to stop the output alarm signal.
(5) the frequency of input clock pulse is 50MHz.)
Platform: |
Size: 52224 |
Author: LIMBO2K
|
Hits:
Description: 为APM，Pixhawk飞控升级最新版本固件；
对飞控进行配置，调整参数以达到最优的性能；
可以在Google或者其它地图上进行点击式的飞行路径规划设置，并将自动航线飞行任务上传至飞控；
可以将飞控上记录的飞行日志下载下来并进行分析；
可以和PC上的飞行模拟器软件进行交互，来实现一个无人机的半实物仿真功能；
在拥有合适的数传电台的情况下，你可以：
1.在操作飞行器的时候同时监测它的状态；
2.通过无线数据传输可以记录下比板载日志功能更多的信息；
3.查看和分析数传日志；
4.在FPV（第一人称视角）模式下操纵你的飞行器。(Upgrade the latest version of firmware for Apm,pixhawk flight control;
The flight control is configured and the parameters are adjusted to achieve optimal performance.
Can be on Google or other maps on the click-Type flight path planning settings, and the automatic route of the mission upload to flight control;
Can download and analyze flight logs recorded on flight control;
Can interact with the Flight Simulator software on PC to realize the hardware-in-the-loop simulation function of UAV;
With the right number of radio stations, you can:
1. Monitor its state while operating the vehicle;
2. Through wireless data transmission can record more information than the onboard log function;
3. View and analyze the digital log; 4. Manipulate your aircraft in FPV (first-person perspective) mode.)
Platform: |
Size: 8180736 |
Author: yjwpm |
Hits:
Description: In millimeter wave (mmWave) systems, antenna architecture limitations make it difficult to apply
conventional fully digital precoding techniques but call for low cost analog radio-frequency (RF) and
digital baseband hybrid precoding methods. This paper investigates joint RF-baseband hybrid precoding
for the downlink of multiuser multi-antenna mmWave systems with a limited number of RF chains. Two
performance measures, maximizing the spectral efficiency and the energy efficiency of the system, are
considered.
Platform: |
Size: 627712 |
Author: hadjidw |
Hits:
Description: Antenna arrays will be an important ingredient in millimeter wave (mmWave) cellular systems.
A natural application of antenna arrays is simultaneous transmission to multiple users. Unfortunately,
the hardware constraints in mmWave systems make it difficult to apply conventional lower frequency
multiuser MIMO precoding techniques at mmWave. This paper develops low-complexity hybrid analog/digital precoding for downlink multiuser mmWave systems. Hybrid precoding involves a combination
of analog and digital processing that is inspired by the power consumption of complete radio frequency
and mixed signal hardware.
Platform: |
Size: 3248128 |
Author: hadjidw |
Hits:
Description: General Description
The SC14480A5M, SC14480A2M6 are family members
of digital CMOS ICs with fully integrated radio
transceivers and baseband processors for DECT &
DECT 6.0 CAT-iQ handsets and basestations.
The SC14480A5M has a FLASH version with CR16
trace unit for development of all family members.
For the family overview refer to SiTel Portal
SC1448x_product_overview.xls
The radio transceiver, when combined with a power
amplifier and a Tx/Rx switch, implements a complete
DECT radio transceiver compiant with the ETSI CTR6
standard.
The audio path comprises a 16 bit CODEC, analog
frontend, including a high efficiency 4 Ohm audio
amplifier (Class-D) and user programmable Gen2DSP.
The CompactRISCTM CR16Cplus microprocessor with
a one wire debug port running from ROM controls the
protocol stack and the I/O peripherals, keyboard,
UART, ACCESS bus, SPI, LED drivers, RF switches
Platform: |
Size: 3697255 |
Author: Andy2248 |
Hits:
«
1
2
...
11
12
13
14
15
16»