Amplitude modulation (AM) and frequency modulation (FM).
Pulse code modulation (PCM) and frequency shift key (FSK).
Phase modulation (PCM) and quadrature phase shift key (QPSK).
Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation.
Pulse-amplitude modulation (PAM).
Pulse-duration modulation (PMD).
Pulse-width modulation (PWM).
Pulse-code modulation (PCM).
Twice that of the modulating signal.
Half that of the modulating signal
Twice that of the carrier signal
Half that of the carrier signal.
2 decibels (dB) of improvement
4 dB of improvement
6 dB of improvement
8 dB of improvement
A phase modulation (PM)
A pulse modulation
A frequency modulation (FM)
An amplitude modulation (AM)
Transmitted intelligence
Intensity of speech
Composite waves
Splatter
20 kHz
50 kHz
75 kHz
88 kHz
Modulation index
Rate of phase shift
Frequency of the modulating signal
Amplitude of the modulating signal
Half the bandwidth as does bi-phase shift keying (BPSK)
The same bandwidth as does BPSK
Twice the bandwidth as does BPSK
Four times the bandwidth as does BPSK
Carrier presence is required to detect changes
It requires a less complex receiver than a basic phase shift keying (PSK) signal
It requires a more complex receiver than a basic PSK signal
The demodulator needs to detect changes in absolute phase values.
Pulse-amplitude modulation (PAM)
Pulse-duration modulation (PDM)
Pulse-position modulation (PPM)
Pulse-code modulation (PCM)
Pulse-amplitude modulation (PAM)
Pulse-duration modulation (PDM)
Pulse-position modulation (PPM)
Pulse-code modulation (PCM)
Pulse-amplitude modulation (PAM)
Pulse-duration modulation (PDM)
Less tolerant of noise than frequency modulation (FM)
Analog-to-digital conversion
Pulse-amplitude modulation (PAM)
Pulse-duration modulation (PDM)
Pulse-position modulation (PPM)
Pulse-code modulation (PCM)
Phase
Time slot
Amplitude
Frequency
3
4
5
8
Encoding
Companding
Uniform quantizing
Nonuniform quantizing
Speed
Phase
Amplitude
Frequency
Delta modulation (DM)
Frequency modulation (FM)
Pulse-code modulation (PCM)
Continuous variable slope delta modulation (CVSD)
Low-pass filter
High- pass filter
Bandpass filter
Band-reject filter
Delta modulation (DM)
Pulse-code modulation (PCM)
Conditioned diphase interface modulation (CDI)
Adaptive differential pulse-code modulation (ADPCM)
35
45
65
75
300 to 1,600 hertz (Hz)
300 to 2,600 Hz
300 to 3,400 Hz
300 to 3,800 Hz
Power variations
Amplitude variations
Black body radiation
Molecular breakdown of electronic components
The sampling rate
Pulse-bit stuffing
Pulse-code modulation
Elastic storage implementation
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