PCM (Pulse-code modulation) Pulse coding modulation, pcm Pulse Coding modulation
In audio processing, we often hear PCM data. What is PCM Data?PCM data is a digital signal after the analog signal passes through PCM. PCM is the process of converting the audio signal from analog signal (time continuous, value continuous) to digital signal (time discrete, value dis
bilateral amplitude modulation (DSB-SC), single sideband amplitude modulation (SSB), residual sideband amplitude modulation (VSB), etc. The nonlinear amplitude modulation has strong anti-jamming performance, including FM (FM), Frequency shift keying (FSK), Phase shift keyin
Ask modulation simulation circuit:Device Selection:Select the signal source of the voltage-controlled sine wave in the sources->controlled_valtage_sources->voltage_controlled_sine_wave.Parameter settings:Set the signal generator to produce 1KHz, duty-free ratio 50%, amplitude of 5V square wave signal.Set the voltage control sine wave signal source control array -5v corresponding frequency 0hz,5v corresponds to 10khz,output peak low value = 0v,output P
The SSB delegation mechanism in MSsql was used two days ago to provide a small message distribution function. Here we will share with you a simple example of this method. step 1: perpardatabasedatausemasterInventorygouseInventoryinventory (TitleIdnvarchar (6) notnull, Quantity, primarykey (TitleId, Q
The SSB delegation mechanism in MSsql was used two days ago to provide a small message distribution functio
SSB router is a complete publishing-subscription framework based on SQL Server Service Broker technology. The message Creator sends the service broker message (also known as article) to SSB Router Server. The SSB Router Server is responsible for distributing messages to different subscribers (subscriber ). Each subscriber subscribes to receive specific messages.
the code and refer to how Service Broker works in conjunction with how it works in 11-8.Use masterGoALTER DATABASE ADVENTUREWORKS2008R2 set Enable_broker with rollback immediate;Go?Use ADVENTUREWORKS2008R2Go?Create message type Receivemsgtype validation = none;Create message type Sendmsgtype validation = none;?GoCreate Contract Samplecontract (Sendmsgtype sent by Initiator,receivemsgtype sent by Target,fraudendofstream sent by Initi Ator);Go?Create Queue Sampletargetque;Create service Sampletar
The ADSL access technology is still quite common. So I studied the modulation knowledge in the ADSL access technology. I would like to share it with you here, hoping it will be useful to you. Asypolicric Digital Subscriber Line (Asymmetric Digital user Line) is an Asymmetric copper access network technology. It uses Digital encoding technology to obtain large data transmission rates from existing copper telephone lines, at the same time, it does not i
made, then the mobile phone receives data with support from the hardware channel!3. How to modulated data
When it comes to signal modulation and demodulation, many people will think of the Radio. Yes, the reason why the radio can hear singing thousands of miles away is that it uses electromagnetic waves as the transmission media, loads the signal of a sound source to an electromagnetic wave through specific modul
The origin of all radio modulation techniques stem back to the AM and FM basic modulation. AM modulation changes the carrier frequency according to the data signal while the FM changes the carrier frequency accord ing to the data signal. The information signal varies with time such as it could increase, decrease, or vanish to zero. The following signal represents
Original link: http://www.elecfans.com/analog/20120509270848_4.htmlAmplitude modulation and detection circuitsRadio and radio communication is the use of modulation technology to add low-frequency sound signal to the high-frequency signal emitted. The process of restoring in the receiver is called demodulation. wherein the low frequency signal is called the modulation
Modern mobile communication systems all use digital modulation technology. Because digital communication is flexible in network construction, it is easy to use digital error control technology and digital encryption to facilitate integration and access the Integrated Service Network (ISDN ), therefore, all communication systems are crossing the data in analog mode. As a part of the entire network, mobile communication will inevitably transition from a
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What is PWM (Pulse Width Modulation): http://www.shenmeshi.com/Science/Science_20070315160722.html
PWM (Pulse Width Modulation)-pulse width modulation (PWM) is an on/off type regulated power supply application. It is a very effective technology that uses the digital output of a microprocessor to control analog circuits.
With the development of electro
How to disable Dynamic Frequency Modulation of CPU 1. how can I check whether the dynamic frequency modulation function www.2cto.com is enabled on the current OS and whether the clock speed of all cores is the maximum CPU speed: grep-E '^ model name | ^ cpu MHz'/proc/cpuinfo can also be used through: lsmod | grep cpufreq_ondemand to check whether the cpufreq_ondemand module is loaded or through: service --
First, FM modulation 1, the code is as follows:CLC,CLEAR;FM= -; %modulation signal frequency (Hz) Am=0.5; %modulation signal Amplitude FC= 5e3; %Carrier Frequency (Hz) Ac=1; %Carrier amplitude MF=5; %FM Index%%%FIRSTLYKF= MF *2* PI * FM/AMDIATF= KF *AmB=2* (MF +1) *FM%%%SECONDLYFS= 64e3; %Sample Rate N= the; %number of sample points T= (0: N-1)'/fs;% time T%plott
I. GMSK modulation signal generation, software radio DSP implementation processTwo. Gmsk demodulation, one-bit differential demodulation, DSP implementation processThree. Based on the software radio architecture idea, has been implemented and optimized DSP, in line with the projectFour. ReferencesThe DSP realization of GSM communication system Gmsk"Gmsk modulation and demodulation and its TMS320C6XXXDSP rea
With the rapid development of the Internet, communication technology is experiencing a huge revolution, because the number of users accessing the network rapidly increases. As a network connected to the end users in the communication network, the access network has become a hot topic in network technology.
Currently, the main access technologies include hybrid fiber/coaxial (HFCs) access technology, optical fiber access technology, copper wire access technology and wireless access technology. Co
A. 4FSK principleDMR System, digital trunking communication system. The DMR protocol adopts a modulation mode of 4FSK, which is a constant envelope modulation, which transmits 2,400 symbols per second and each symbol carries two bits of information. The maximum frequency offset d is defined as follows:d = 3h/2t,h represents the frequency offset factor for each modulatio
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