40G QPSK and DQPSK Modulation
... The on-going growing demand for greater capacity in optical communication systems, calls for an increase in transmission speed from 10 Gbps to 40 Gbps and beyond, while maintaining signal quality. Optical communication systems have predominantly used some form of on/off keying (OOK) as a modulation ...
... The on-going growing demand for greater capacity in optical communication systems, calls for an increase in transmission speed from 10 Gbps to 40 Gbps and beyond, while maintaining signal quality. Optical communication systems have predominantly used some form of on/off keying (OOK) as a modulation ...
Document
... What is the purpose of AFC loop? Why is one required for the crosby transmitter? The purpose of AFC loop is to achieve a near crystal stability of the transmit carrier frequency without using a crystal in the carrier oscillator. It is required for Crosby transmitter because this transmitter uses eit ...
... What is the purpose of AFC loop? Why is one required for the crosby transmitter? The purpose of AFC loop is to achieve a near crystal stability of the transmit carrier frequency without using a crystal in the carrier oscillator. It is required for Crosby transmitter because this transmitter uses eit ...
AD8346 数据手册DataSheet 下载
... I Channel Baseband Positive Input Pin. Input should be dc-biased to approximately 1.2 V. Nominal characterized ac swing is 1 V p-p (0.7 V to 1.7 V). This makes the differential input 2 V p-p when IBBN is 180 degrees out of phase from IBBP. I Channel Baseband Negative Input Pin. Input should be dc-bi ...
... I Channel Baseband Positive Input Pin. Input should be dc-biased to approximately 1.2 V. Nominal characterized ac swing is 1 V p-p (0.7 V to 1.7 V). This makes the differential input 2 V p-p when IBBN is 180 degrees out of phase from IBBP. I Channel Baseband Negative Input Pin. Input should be dc-bi ...
ch-66 - Technology
... which lies within the audible range of 20 to 20,000 Hz. Variations in human voice can be converted into corresponding variations in electric current with the help of a microphone as Fig. 66.2 shown in Fig.66.2. When a sound wave strikes the microphone, it produces AF sound current. The positive half ...
... which lies within the audible range of 20 to 20,000 Hz. Variations in human voice can be converted into corresponding variations in electric current with the help of a microphone as Fig. 66.2 shown in Fig.66.2. When a sound wave strikes the microphone, it produces AF sound current. The positive half ...
Drake_TR-4C HF Comms Reciever_Manual
... Figure 3-l illustrates and describes all front panel controls and indicators on the TR-4C Transceiver. Controls and connectors located on the rear and sides of the unit are described under “other controls” below. Rear chassis connectors are identified in figure 2-2. 3-2. MODE SWITCH. In the SSB posi ...
... Figure 3-l illustrates and describes all front panel controls and indicators on the TR-4C Transceiver. Controls and connectors located on the rear and sides of the unit are described under “other controls” below. Rear chassis connectors are identified in figure 2-2. 3-2. MODE SWITCH. In the SSB posi ...
COMPARISON BETWEEN TWO MODULATION TECHNIQUES FOR
... It can be seen in Fig. 1 that there are 4 sets of registers in the datapath. So the ZSS computation needs 4 clock cycles. The 4 computational steps correspond to the following operations: the input values are saved, the absolute values of the sinusoidal signals are computed and saved, the 3 differen ...
... It can be seen in Fig. 1 that there are 4 sets of registers in the datapath. So the ZSS computation needs 4 clock cycles. The 4 computational steps correspond to the following operations: the input values are saved, the absolute values of the sinusoidal signals are computed and saved, the 3 differen ...
ZA013563570
... transmitted digital pulses are successfully detected at the receiver. The output of the detector is fed to comparator which is examined using the dual trace oscilloscope as shown in figure 8. Now adjusts the bias 1 preset until the bias input at t.p.13 is halfway between the top and the bottom of th ...
... transmitted digital pulses are successfully detected at the receiver. The output of the detector is fed to comparator which is examined using the dual trace oscilloscope as shown in figure 8. Now adjusts the bias 1 preset until the bias input at t.p.13 is halfway between the top and the bottom of th ...
WIDE-BAND PERCEPTUAL AUDIO CODING BASED ON
... Clearly, for coding efficiency, the residual signal representing the Hilbert carrier of the sub-band FDLP envelope cannot be transmitted in its original form, but needs to be efficiently coded to preserve its important components as accurately as possible for proper reconstruction of the coded signa ...
... Clearly, for coding efficiency, the residual signal representing the Hilbert carrier of the sub-band FDLP envelope cannot be transmitted in its original form, but needs to be efficiently coded to preserve its important components as accurately as possible for proper reconstruction of the coded signa ...
Radio receiver circuits
... amplifier input. However, the same output voltage also drives an identical-valued current in the opposite direction through Cn and L1b. Therefore the currents in L1 will be equal and opposing, thereby resulting in a zero feedback voltage appearing at the input of the amplifier. This null will only o ...
... amplifier input. However, the same output voltage also drives an identical-valued current in the opposite direction through Cn and L1b. Therefore the currents in L1 will be equal and opposing, thereby resulting in a zero feedback voltage appearing at the input of the amplifier. This null will only o ...
Notes on ASK, FSK and PSK
... For example, a standard telephone circuit has a bandwidth of approximately 2700 Hz, which has the capacity to propagate 5400 bps through it. However, if more than two levels are used for signaling (higher-than-binary encoding), more than one bit may be transmitted at a time, and it is possible to pr ...
... For example, a standard telephone circuit has a bandwidth of approximately 2700 Hz, which has the capacity to propagate 5400 bps through it. However, if more than two levels are used for signaling (higher-than-binary encoding), more than one bit may be transmitted at a time, and it is possible to pr ...
AD8346 0.8 GHz to 2.5 GHz Quadrature Modulator Data Sheet (Rev
... I Channel Baseband Positive Input Pin. Input should be dc-biased to approximately 1.2 V. Nominal characterized ac swing is 1 V p-p (0.7 V to 1.7 V). This makes the differential input 2 V p-p when IBBN is 180 degrees out of phase from IBBP. I Channel Baseband Negative Input Pin. Input should be dc-bi ...
... I Channel Baseband Positive Input Pin. Input should be dc-biased to approximately 1.2 V. Nominal characterized ac swing is 1 V p-p (0.7 V to 1.7 V). This makes the differential input 2 V p-p when IBBN is 180 degrees out of phase from IBBP. I Channel Baseband Negative Input Pin. Input should be dc-bi ...
TG2000 low cost 20MHz DDS function generator from TTi
... impedance of 50Ω or 600Ω. Waveform quality remains excellent over the full amplitude range. ...
... impedance of 50Ω or 600Ω. Waveform quality remains excellent over the full amplitude range. ...
Collector-Injection Modulator
... controlled by changes in the control grid bias, the gain of the tube requires only a low-level modulating signal. Even when the input signals are at these low levels, occasional modulation voltage peaks will occur that will cause V1 to saturate. This creates distortion in the output. Care must be ta ...
... controlled by changes in the control grid bias, the gain of the tube requires only a low-level modulating signal. Even when the input signals are at these low levels, occasional modulation voltage peaks will occur that will cause V1 to saturate. This creates distortion in the output. Care must be ta ...
Perception of mid frequency and high frequency
... equal amplitude sine waves. A root, the minor third above, and the fifth above the root. The minor third was chosen as even tempered, and the fifth was chosen to be perfect. Thus a sweep would consist of a frequency f0 which sweeps from 250Hz to 4kHz, in combination with f1 = 1.1225*f0, in combinati ...
... equal amplitude sine waves. A root, the minor third above, and the fifth above the root. The minor third was chosen as even tempered, and the fifth was chosen to be perfect. Thus a sweep would consist of a frequency f0 which sweeps from 250Hz to 4kHz, in combination with f1 = 1.1225*f0, in combinati ...
Perception of mid frequency and high frequency intermodulation
... equal amplitude sine waves. A root, the minor third above, and the fifth above the root. The minor third was chosen as even tempered, and the fifth was chosen to be perfect. Thus a sweep would consist of a frequency f0 which sweeps from 250Hz to 4kHz, in combination with f1 = 1.1225*f0, in combinati ...
... equal amplitude sine waves. A root, the minor third above, and the fifth above the root. The minor third was chosen as even tempered, and the fifth was chosen to be perfect. Thus a sweep would consist of a frequency f0 which sweeps from 250Hz to 4kHz, in combination with f1 = 1.1225*f0, in combinati ...
EEL 4512 – INTRODUCTION TO COMMUNICATION SYSTEMS
... case where the RC time constant is too short and plot the results as Figure 4. Finally, find a case where the RC time constant is too long and plot the results as Figure 5. 4. Now set the values of R2 and C1 to their optimal values as found in the above step. Plot the results for different values of ...
... case where the RC time constant is too short and plot the results as Figure 4. Finally, find a case where the RC time constant is too long and plot the results as Figure 5. 4. Now set the values of R2 and C1 to their optimal values as found in the above step. Plot the results for different values of ...
Tech Short 16 - Detectors and Discriminators
... rather briefly outline the various forms of detector used in valve receivers, when and why they are used, discuss typical detector circuits used in Eddystone valve receivers of the post-WWII era, and provide some commentary on their performance and faults that may develop in them. Detector circuits ...
... rather briefly outline the various forms of detector used in valve receivers, when and why they are used, discuss typical detector circuits used in Eddystone valve receivers of the post-WWII era, and provide some commentary on their performance and faults that may develop in them. Detector circuits ...
Exponential Carrier Wave Modulation
... requires no tuning, as usually in FM radios) Helsinki University of Technology,Communications Laboratory, Timo O. Korhonen ...
... requires no tuning, as usually in FM radios) Helsinki University of Technology,Communications Laboratory, Timo O. Korhonen ...
LICOMBA Communications Integrated Laboratory Laboratory structure Modules
... This module allows to show the three main deltas: Delta modulation: The basic one. May transmit with errors, if the signal contains high frequency components or direct current levels. Adaptive-delta modulation: Using variable gain integrators the frequency problem can be solved. The consequence is a ...
... This module allows to show the three main deltas: Delta modulation: The basic one. May transmit with errors, if the signal contains high frequency components or direct current levels. Adaptive-delta modulation: Using variable gain integrators the frequency problem can be solved. The consequence is a ...
MC1496, MC1496B Balanced Modulators/ Demodulators
... not fully switch the upper switching devices, and results in lower signal gain, hence lower carrier suppression. A higher than optimum carrier level results in unnecessary device and circuit carrier feedthrough, which again degenerates the suppression figure. The MC1496 has been characterized with a ...
... not fully switch the upper switching devices, and results in lower signal gain, hence lower carrier suppression. A higher than optimum carrier level results in unnecessary device and circuit carrier feedthrough, which again degenerates the suppression figure. The MC1496 has been characterized with a ...
Signal Encoding Techniques
... Quadrature Amplitude Modulation • QAM used on asymmetric digital subscriber line (ADSL) and some wireless standards • Combination of ASK and PSK • Can also be considered a logical extension of QPSK • Send two different signals simultaneously on same carrier frequency — Use two copies of carrier, one ...
... Quadrature Amplitude Modulation • QAM used on asymmetric digital subscriber line (ADSL) and some wireless standards • Combination of ASK and PSK • Can also be considered a logical extension of QPSK • Send two different signals simultaneously on same carrier frequency — Use two copies of carrier, one ...
Unit 4 Frequency Modulation
... Heterodyne receivers "mix" all of the incoming signals with an internally generated waveform called the local oscillator. The user tunes the radio by adjusting the set's oscillator frequency, In the mixer stage of a receiver, the local oscillator signal multiplies with the incoming signals, which sh ...
... Heterodyne receivers "mix" all of the incoming signals with an internally generated waveform called the local oscillator. The user tunes the radio by adjusting the set's oscillator frequency, In the mixer stage of a receiver, the local oscillator signal multiplies with the incoming signals, which sh ...
01_02_03_05b-TransmissionOfInformation
... The use in MP3 of a lossy compression algorithm is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners. An MP3 file that is created using the setting of 128 kbit/s w ...
... The use in MP3 of a lossy compression algorithm is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners. An MP3 file that is created using the setting of 128 kbit/s w ...
Amplitude and Angle Modulation
... application of current pulses to the tuned tank circuit gives AM signal. The operation can be shown by waveforms as shown in Fig. 2.6b. ...
... application of current pulses to the tuned tank circuit gives AM signal. The operation can be shown by waveforms as shown in Fig. 2.6b. ...
Single-sideband modulation
In radio communications, Single-SideBand modulation (SSB) or Single-SideBand Suppressed-Carrier (SSB-SC) is a refinement of amplitude modulation which uses transmitter power and bandwidth more efficiently. Amplitude modulation produces an output signal that has twice the bandwidth of the original baseband signal. Single-sideband modulation avoids this bandwidth doubling, and the power wasted on a carrier, at the cost of increased device complexity and more difficult tuning at the receiver.