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Detection of FM Frequency-modulated (FM) signals can be detected in various ways These methods also work for phase modulation Slope detection: An AM receiver can detect FM in a crude manner by setting the receiver frequency near, but not on, the FM unmodulated-carrier frequency An AM receiver has a filter with a passband of a few kilohertz, having a selectivity curve such as that shown in Fig 25-14B If the FM unmodulated-carrier frequency is near either edge, or skirt, of the filter response, frequency variations in the incoming signal cause it to swing in and out of the receiver passband This causes the instantaneous receiver output to vary The relationship between the instantaneous FM deviation and the instantaneous output amplitude is not linear, however, because the skirt of the passband is not a straight line, as is apparent in the figure The result is an unnatural-sounding received signal PLL: If an FM signal is injected into a PLL, the loop produces an error voltage that is a duplicate of the modulating waveform A limiter, which keeps the signal amplitude from varying, can be placed ahead of the PLL so the receiver does not respond to AM Weak signals tend to abruptly appear and disappear, rather than fading, in an FM receiver that employs limiting Discriminator: This type of FM detector produces an output voltage that depends on the instantaneous signal frequency When the signal is at the center of the passband, the output voltage is zero If the frequency falls below center, the output voltage becomes positive If the frequency rises above center, the output becomes negative The relationship between the instantaneous FM deviation and the instantaneous output amplitude is linear, so the output is a faithful reproduction of the incoming signal data A discriminator is sensitive to amplitude variations, but this can be overcome by a limiter Ratio detector: This type of FM detector is a discriminator with a built-in limiter The original design was developed by RCA (Radio Corporation of America), and is used in high-fidelity receivers and in the audio portions of TV receivers A simple ratio detector circuit is shown in Fig 25-14C The balance potentiometer should be adjusted for the best received signal quality.

So how does this all work As figure 1 showed, it all starts with the partition function. This is a special type of function used in table partitioning, and is unlike other T-SQL functions in several ways. Like other functions, each partition function is scoped to the database it s created in. Although the partition function is a user-created database object, it s not visible by ordinary means in Management Studio; you can find partition functions, along with partition schemes, in the Storage node for each database. The reason is because the partition function is a special database object, not found in the sys.sysobjects table like other user-created and system functions.

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What a partition function does is define the boundaries of a partitioned table based on the data type of the partitioning key of the table. The partition function splits up the range of all possible values that might be in the partitioning key of a table, and assigns each to a possible partition. It s important to see that the partition function operates in a flexible way that can change over time. This is critical: you use the SPLIT and MERGE operations to add and remove partitions in a table by adding and removing partitions in the table s partition function. For example, you can create a partition function using the following syntax:

Detection of SSB For reception of SSB signals, a product detector is preferred, although a direct-conversion receiver can also do the job A product detector also works well for the reception of CW and FSK The incoming signal combines with the output of an unmodulated LO, producing audio or video Product detection is done at a single frequency, rather than at a variable frequency as in direct-conversion reception The single, constant frequency is obtained by mixing the incoming signal with the output of the LO Two product-detector circuits, which are also representative of the mixers used in superhet receivers, are shown in Fig 25-14D and E At D, diodes are used; there is no amplification At E, a bipolar transistor is employed; this circuit provides some gain The essential characteristic of either circuit is the nonlinearity of the semiconductor devices This generates the sum and difference frequency signals that result in audio or video output

Figure 8-10 Drag your icon to the Bundle Contents drawer at the side of the AppleScript Editor window

CREATE PARTITION FUNCTION PFNExample1_Left (int) AS RANGE LEFT FOR VALUES (10, 20, 30);