Analog modulation is
typically used for AM, FM radio, and short-wave broadcasting.
Digital modulation
involves transmission of binary signals (0 and 1).
Digital modulation involves transmission of binary signals (0 and 1).
HDMI Encoder Modulator,16in1 Digital Headend, HD RF Modulator at Soukacatv.com
SKD32 IPTV Gateway
SKD81 IP Set Top Box
This method is
divided into single carrier modulation, by which the carrier occupies the
entire bandwidth (i.e. amplitude, frequency, and phase), and a multicarrier
scheme that modulates and transmits different data on multiple carriers.
In addition, there is
a pulse modulation technique used to change the pulse width and spread spectrum
method that spreads the signal energy over a wide band.
Modulation Method Definitions
In wireless
communication, information is transmitted by encoding voice and data on radio
waves of certain frequencies.
This section outlines
the modulation methods adopted by ROHM's short-range wireless lineup.
ASK (Amplitude Shift Keying)
A digital modulation
method that sends transmission data by varying the presence/absence of analog
signals.
FSK (Frequency Shift Keying)
This technique
utilizes the difference in the amplitude of analog signals to modulate digital
signals by switching between low frequency and high frequency in order to
represent 0 and 1.
[ASK and FSK]
O-QPSK (Offset-Quaternary Phase Shift Keying)
A digital modulation
scheme that performs data transmission by phase-modulating a reference signal.
The timing of the in-phase component (I) and quadrature component (Q) are
shifted by 1/2 from QPSK, which performs phase modulation in 4 steps.
*A spatial signal
diagram is a representation of a data signal on a two-dimensional plane.
[O-QPSK Signal Space Diagram*]
SKD121X Encoding & Multiplexing Modulator
Household Universal Encoding & Modulation Modulator
OFDM (Orthogonal Frequency Division Multiplexing)
A multicarrier
digital modulation method that transmits large amounts of data over multiple
closely spaced data streams.
SKD3013 3 Channel HD Encode Modulator
DSSS (Direct Sequence Spread Spectrum)
A type of spread
spectrum method utilizing a direct spread technique. Data signals are spread over
a wide frequency band at low power.
Established in 2000, the Soukacatv.com main
products are modulators both in analog and digital ones, amplifier and
combiner. We are the very first one in manufacturing the headend system in
China. Our 16 in 1 and 24 in 1 now are the most popular products all over the
world.
For more, please access to https://www.soukacatv.com.
CONTACT US
Company: Dingshengwei Electronics Co., Ltd
Address: Bldg A, the first industry park of
Guanlong, Xili Town, Nanshan, Shenzhen, Guangdong, China
Tel: +86 0755 26909863
Fax: +86 0755 26984949
Mobile: 13410066011
Email: ken@soukacatv.com
Source: rohm
没有评论:
发表评论