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Tone Control The amplitude versus frequency characteristics of a hi-fi sound system are adjusted by means of a tone control or controls In its simplest form, a tone control consists of a single knob or slide device The counterclockwise, lower, or left-hand settings of this control result in strong bass and weak treble audio output The clockwise, upper, or right-hand settings result in weak bass and strong treble When the control is set to midposition, the audio response of the amplifier is more or less flat; that is, the bass, midrange, and treble are in roughly the same proportions as in the recorded or received signal Figure 31-3A shows how a single-knob tone control can be incorporated into an audio amplifier The amplifier is designed so that the treble response is exaggerated The potentiometer attenuates the treble to a variable extent A more versatile tone control has two capacitors and two potentiometers, as shown in Fig 31-3B One combination is in series, and the other is in parallel The series-connected resistance-capacitance (RC) circuit is connected in parallel with the audio output, and it attenuates the treble to a variable extent The parallel RC circuit is in series with the audio path, and it attenuates the bass to a variable extent The two potentiometers can be adjusted separately, although there is some interaction Audio Mixer If you simply connect two or more audio sources to the same input of an amplifier, you can t expect good results Different signal sources (such as a computer, a tuner, and a CD player) are likely to

Summary

Add a string containing the message for the error As with the error command, the message is a direct parameter and doesn t have a parameter keyword, such as message, as parameters usually do

What neither of these tells us is that the existence of the index is being used by the optimizer. The optimizer sees that we re grouping by a field which has a unique index on it, and realizes that this is somewhat redundant. That s right AK_Product Subcategory_Name is a UNIQUE index, ensuring that every entry in the Name column is different from all the rest. Therefore, the optimizer can treat the query as if it s grouping by the field from the other table (the field that we re joining to) without changing the logic of the query at all. Without the unique index, the optimizer considers that there may be nondistinct values in the field, so it must perform the grouping on that field explicitly. We see this in our first, simpler queries as well. When the unique field ProductNumber was introduced to the mix, the optimizer realized that no Distinct Sort was required, and treated the query as a simple index scan. In figure 7, we see that the Production.ProductSubcategory table is accessed only after the grouping has been completed. The Sort operator is sorting the Production. Product table by the ProductSubcategoryID field and aggregating its data on that field. Even though we request the grouping to be done on s.Name, the system has completed the grouping before s.Name becomes available. The optimizer is clearly using the existence of the unique index when deciding how to execute the query, even though the index isn t being used in other ways.

control At A, a single potentiometer/capacitor combination (X) provides treble attenuation only At B, one potentiometer/ capacitor combination (X) attenuates the treble, and the other (Y) attenuates the bass

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CREATE PROCEDURE load_fragments_personlists AS SET NOCOUNT ON SET XACT_ABORT ON DECLARE @batchstart int, @batchsize int, @totalrows int SELECT @batchstart = 1, @batchsize = 20000 SELECT @totalrows = COUNT(*) FROM persons TRUNCATE TABLE fragments_personlists WHILE @batchstart <= @totalrows BEGIN ; WITH numbered_persons(person_id, email, rowno) AS ( SELECT person_id, email, row_number() OVER(ORDER BY email, person_id) FROM persons ), personlists(fragment, person_list, cnt) AS ( SELECT w.frag, dbo.integerlist(p.person_id), COUNT(*) FROM numbered_persons AS p CROSS APPLY wordfragments (p.email) AS w WHERE p.rowno >= @batchstart AND p.rowno < @batchstart + @batchsize GROUP BY w.frag ) MERGE fragments_personlists AS fp USING personlists AS p ON fp.fragment = p.fragment WHEN MATCHED THEN UPDATE SET no_of_entries = fp.no_of_entries + p.cnt, stored_person_list.write(p.person_list + CASE WHEN fp.listlen < 7000 AND fp.listlen < 4 * (fp.no_of_entries + p.cnt) THEN convert(varbinary(2000), replicate(0x0, 4 * (fp.no_of_entries + p.cnt))) ELSE 0x END, 4 * fp.no_of_entries, 4 * p.cnt) WHEN NOT MATCHED BY TARGET THEN

INSERT(fragment, no_of_entries, stored_person_list) VALUES (p.fragment, p.cnt, p.person_list + CASE WHEN p.cnt < 7000 THEN convert(varbinary(2000), replicate(0x0, 4 * p.cnt)) ELSE 0x END); SELECT @batchstart = @batchstart + @batchsize END ALTER INDEX pk_fragments_personlists ON fragments_personlists REORGANIZE

have different impedances When connected together, the impedances appear in parallel This can cause impedance mismatches for most or all of the sources, as well as at the amplifier input The result will be degradation of system efficiency and poor overall performance Another problem arises from the fact that the signal amplitudes from various sources almost always differ A microphone produces minuscule audio-frequency currents, whereas some tuners produce enough power to drive a pair of small loudspeakers Connecting both of these together will cause the microphone signal to be obliterated by the signal from the tuner In addition, the tuner output audio might damage the microphone An audio mixer eliminates all of the problems involved with the connection of multiple devices to a single channel First, it isolates the inputs from each other, so there is no impedance mismatch or competition among the sources Second, the gain at each input can be varied independently This allows adjustment of amplitudes so the signals blend in the desired ratio