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PocketRTA has many features which can only be found in much more expensive sound analysis software, providing accurate graphical feedback for amateur hi-fi enthusiasts, A/V engineers / installers and electricians.PocketRTA samples sounds picked up by the built-in microphone on the Pocket PC or the input of your PC's sound card and then applies a Fourier Transform to the samples to obtain a frequency spectrum. The result is an accurate representation of the sampled sound broken down into its frequency components.}' There are two versions of PocketRTA in this package, one that can be installed on your Pocket PC and the other will run on any PC running Windows 95/98/ME or XP. These two programs are almost identical in design although because the PocketPC does not have the processing power of your desktop PC it is not quite as accurate but has additional features to compensate for this.6 ** $4P:HFeatures&*# 0 ̀4P:H""""""""44Khz sampling allowing signals up to 22Khz to be measured.Dual Channel FFT display (PC version only).Definable FFT size and sample frequency (Pocket PC only).Single channel spectrograph Standard ANSI/IEC A and C weighting curves.Automatic noise cancellation.Automatic peak note / frequency and octave display.Narrow band Linear and Logarithmic scalable displays.*O  ̀Q4P:H""""""""Octave, 1/3 octave and 1/6 octave displays.SPL (Sound Pressure Level) display.250x zoom for accurate analysis of narrow band data.Internal Signal GeneratorTouch screen plotting of nearest point with frequency and decibel readout.Up to 64x averaging and smoothing to help stabilize the display.Peak trace facility for better reading of fluctuating frequencies.Selectable signal decay speeds.e0 < H4P:H""Selectable signal gain control.Pause facility freezes the live trace to aid analysis of data,DO 4 . *-Getting Started.When you run Pocket RTA the display mode defaults to a narrow band linear frequency graph showing a complete spectrum of sound from 0 to 22Khz. The PC version is hard coded to perform a 44.1Khz - 8K - FFT which means it takes 1024*8=8192 samples from the microphone before each frequency analysis. This gives a theoretical distance between consecutive points (resolution) as 44100 / 8192 = 5.38Hz. The Pocket PC on the other hand performs floating point calculations much slower than your desktop PC and could not manage to perform a real time display with data this large. To compensate the Pocket PC version allows you to restrict the sample frequency with the benefit of increasing accuracy. This will be explained in more detail later in this documentation. & Z # D4 4 8""Figure 1!Z & The other major difference in the two versions is that the PC is able to display two simultaneous traces, one for the left channel and one for the right (See Figure 1). This is useful for monitoring stereo signals or if you want to display input data against a known test signal.Another point worth noting is that the maximum frequency that can be analysed is half that of the sample frequency. This is because each cycle of a sound requires two values, one high and one low in order to generate sound.t lB- (Changing FFT SettlB ings (Pocket PC only)Since the Pocket PC is unable to process data as fast as your desktop PC, you can change various FFT settings in order to give a faster response to our input signal. The thing to remember is that the more data we process the more accurate the results but the slower the display. If you only need to analyse signals up to 4Khz for example you can change the sample frequency to 8Khz which cuts down on the amount of data sampled from our input source. If we only need a rough estimation of frequency then we can start with a small buffer size which again speeds up display response.&B# 3lBC. * " Pressing the FFT Parameters button on your Pocket PC allows you to input new values for Sample Rate and FFT buffer size (See figure 2). If you change either of these settings you will notice that the resolution and time constant values change accordingly.DB D4 8""Figure 2hCF5 8RESOLUTION = SAMPLE FREQUENCY / FFT SIZETIME CONSTANT = 1000 / RESOLUTIONAs you can see in the above formula both display resolution and the time needed to process the data are directly related to the sample frequency and the FFT buffer size. Specifying a low sample frequency and a small buffer size will provide the fastest update but at the expense of accuracy. Decibel Levels - What are they?The decibel (abbreviated as dB) is a logarithmic expression of the ratio between two signals. A decibel is one-tenth of a Bel, a seldom-used unit named for Alexander Graham Bell, inventor of the telephone. 1 DH3 4A decibel is a ratio, so its absolute value is not really significant. It is just a way of saying one sound is N times louder than another sound. Decibels are calculated using the following formula:-dB = 20 * log10 (S1 / S2)where S1 is the input signal and S2 is the smallest possible input signal that can be measured.PocketRTA samples sounds using 16 bit sampling which means there are 65535 distinguishable voltage levels. The maximum dB level measurable is therefore 20log(65535/1) = 96 dB. FK> J"By definition an input signal which is as loud as the maximum possible input level has a decibel value of 0db. Any signal which is less than the maximum input is displayed as a negative value on PocketRTA's display. For convenience PocketRTA therefore displays db values in the range of 0 to -100db.Peak Level Display PocketRTA is constantly monitoring the sound source for the loudest frequency and automatically displays this along with estimated musical note id and octave on the screen below the microphone level meters. The value of frequency is interpolated so it is not tied to the resolution of the FFT and can be considered relatively accurate (approx 0.01 Hz at 1Khz on PC version).i0H?N9 @c"Microphone / Input Levels Pocket RTA gives a constant readout of the input signal using the two sets of lights at the top of the display. A decibel readout is also provided which displays the peak volume for a given period of time. You should assume a value of 0dB to indicate that clipping has occurred and the sampled sound was distorted in some way. TIP: If you are running the PC version of PocketRTA it is possible to select the line in / microphone / cd or wave device as the source of input using the recording section of your Windows mixer.K_1 0Input GainThis option allows fairly course calibration of the input signal. If the input signal is too low to read then you may wish to increase the level by 3db which is equivalent to doubling the input sound level. In Spectrograph mode you may want to decrease the gain in order to prevent unwanted background noise from cluttering the display. You can also use this option in conjunctio?N_ n with the 'Noise Weighing' curve in order to totally eliminate background noise.?N_\ INarrow band Linear and Logarithmic Display ModesBy default the linear display mode is used as for most purposes this is the most useful display mode. Initially the whole spectrum is displayed on screen but you can zoom in and out using the arrow keys or direction pad on the Pocket PC.KeyOperationUP Zoom InDOWN Zoom OutLEFT Scroll display to the left.RIGHTScroll display to the right.D_4 8""Figure 3<_߄& -The ZOOM feature allows you to magnify the display up to 250 times in order to get a clearer view of a given frequency range. You can determine the frequency and dB level at any point on the graph by simply pressing the left mouse button (touch screen on the Pocket PC) on the graph nearest the point of interest. The Logarithmic display is better suited for analysing data of a musical nature as the frequencies of consecutive notes are themselves logarithmic. In this mode the distance between consecutive notes is equidistant.{- *TIP: You may find it handy in some instances to PAUSE the trace before zooming.Octave and Sub Octave Display ModesN߄Յ< H(""  Figure 4' These modes are similar to those found on a conventional spectrum analyser and are not scalable. The basic Octave display breaks the frequency spectrum into ISO standard spaced bands which are one musical octave apart. Because the musical scale is logarithmic it makes more sense view music using this type of display than a linear display. You can determine the center frequency and amplitude of a bin by simply clicking your left mouse button (touch screen on Pocket PC) on a chosen bin.dՅ1 01/3 and 1/6 Octave displays are simply sub divisions of the Octave display.Spectrograph DisplayA Spectrograph is a 3D representation of frequency/amplitude over time often used for analysing speech. Each row of the spectrograph represents the results of an FFT on a block of data read from the microphone, the lowest row being the most recent. Bĉ3 6 " Figure 52 2UThe colors represent the amplitude of the frequency at a given point in time. Colors range from BLUE, through CYAN, GREEN and YELLOW to RED being the color representing the loudest ampliture possible.You can halt the display at any time using the PAUSE button. It is also possible to use the cursoe keys (touch screen on Pocket PC) to zoom into the spectrograph in order to focus on a frequency range.SPL - Sound Pressure Level DisplayThe SPL display is used to determine noise levels such as those recorded by sound level meters. Unlike these dedicated devices that are specifically designed and calibrated PocketRTA works totally in the digital domain and can only be as accurate as the computer's sound hardware. PocketRTA does not know the A/D converter's input voltage range or any other details about the gain structure of an input signal and therefore must be calibrated to obtain accurate sound pressure readings.ĉ[& +By default, PocketRTA is internally calibrated so that the maximum input signal from your Analog to Digital converter gives a reading of 100db. B3 6 " Figure 6n[F/ ,Figure 6 shows the SPL display and a default calibration level setting of 100db which can be modified in 1db increments during the calibration process. In order to calibrate PocketRTA you need a standard Sound Level Meter (SLM).Calibrating Pocket RTA for SPL.The calibration process of the SPL displaF y is relatively simple and requires the use of a standard Sound Level Meter. With PocketRTA in SPL mode use the PC's PAGEUP and PAGEDN keys in order to adjust the calibration level until PocketRTA's readout matches that of the SLM (use buttons A and B to the right of the direction pad on the Pocket PC version).]' Note that if you change the gain of the microphone preamp or mixer settings then you will need to repeat the procedure above to recalibrate. Please Note: SPL is only as accurate as the hardware you are running on so it is important to use a good quality microphone. Another point to note is that the Pocket PC's hardware may not be as sensitive to extreme low and high frequencies as a PC's hardware. This is most obvious when comparing A and C weightings which may give unexpected results..F5 8Using SPLIf the sound source contains short bursts or you are interested in peak readings then set Averaging to Off and Decay to Fast. This is roughly what you would expect from a SLM set to SLOW mode. To measure average sound levels set Averaging to 16 or higher. This is the equivalent of a SLM set to FAST mode.By default 'A Weighting' is selected when you enter SPL mode. A weighting is used for checking noise levels whereas 'C Weighting' is used for measuring levels of musical material.]. *Weighting CurvesThe sensitivity of the human auditory system is highly level and frequency dependent. At frequencies below 500Hz and above 4Khz hearing sensitivity drops. This means that both extreme low and high frequency sounds tend to sound quieter than normal speech levels. To compensate most professional audio equipment use some kind of frequency-dependent weighting curve. Some common examples include the ANSI / IEC "A" and "C" weighting curves used in sound level measurements.b3' PocketRTA can calculate the A, C and U weighted response curves and adjust the display to automatically compensate. PocketRTA also provides a unique noise cancellation curve which subtracts background noise from the input signal. To use this functionality you should first turn off all weighting curves and then ensure there are no other noises present other than those you wish to eliminate. Finally select 'Noise Weighting' from the Weighting menu. The display should now show approx -100db across the spectrum. If neccessary you can use the GAIN control to totally eliminate any remaining signals. d7 <Averaging This function is used to help make the display more stable and easier to read. As a general rule, the more difficult the measurement conditions, the more averaging is required. Note however that increasing the number of averages also causes real-time displays to respond more slowly. If this is a problem then it may be better to increase the Decay time rather than use averaging at all.Decay TimeDecay is a setting which refers to how quickly a frequency dies. A large decay time is often useful for measuring a highly fluctuating signal. If the input source contains small bursts of energy then setting a higher 'Decay' time may be more favorable than setting a higher 'Averaging' value. Averaging would have the side effect of diluting a signal that was present in short bursts whereas setting a high Decay time would highlight the peaks.30 .Tone GeneratorPocketRTA has a built in tone generator capable of generating test signals for use in measuring frequency response. You can generate sine waves at 1K, 2K 4K, 8K and 16K as well as white noise. You can use the Pocket PC's headphone socket to route the output through equipment under test. Because of internal resonance you may get undesired sub-harmonics on the display if you use the Pocket PC's internal speaker to play the test tones.To play a test tone press the Tone button at the botto m of the PocketRTA window and select the desired tone description from the popup menu. You can adjust the volume of the test tone using the two small volume buttons to the left and right of the Tone button.8 >TraceAll display modes accept the Spectrograph display a trace when this option is enabled. The trace shows the maximum amplitude over the frequency spectrum for a given period. This can be very handy if the input source has a rapidly fluctuating signal.PauseThe Pause feature temporarily freezes the display allowing close inspection of captured data. This is extremely useful when you have a highly fluctuating signal or when you need to take several readings across the frequency spectrum. When in PAUSE mode you can utilize PocketRTA's zoom feature and take readings by clicking the left mouse button on various locations on the graph.o@ N Pressing the PAUSE key a second time resumes data capture.Exiting the ProgramTo exit PocketRTA on the Pocket PC press the RECORD button (left hand shoulder buttonon the IPAQ) or the START button (Center of the direction pad).Contact UsYou can contact us through our website or via email address specified below:-Support Email:support@4pockets.comWeb Site:www.4Pockets.com11MS Sans SerifArialCourier NewTimes New Roman]T>Ӊ uSE*/&;)F24AveragingContentsDecay TimeDecibel Levels FeaturesFFT SettingsGetting StartedInput GainInput Levels Linear$Logarithmic(Microphone,Narrow band0Octave4Pause8Peak Level Display<Spectrograph@Sub OctaveDTone GeneratorHTraceLWeighting CurvesP/&;)LzContents/&;)L4 ހ5*=yģTӉEyJ CQuGy!7!>U%/l5sLP"8oqhlpx$nfeflp0C? 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