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Marani Pro Audio PDA500PF, Быстрое руководство пользователя

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Marani Pro Audio PDA500PF Скачать руководство пользователя страница 35

As a consequence of the windowing process, the computed IR is not accurate in the low frequency
range: it is not possible to estimate the frequency response below the reciprocal of the analisys time
interval, due to the time-frequency duality. So, to avoid misleading view, the frequency response plot
shows a dotted line below 200Hz.

To proceed with the FIR filter computation, click “Next” button and the “Calculate FIR” page will be
shown.

FIR Calculation

Содержание PDA500PF

Страница 1: ...e internal intermediate processes and high performance 24bit AD DA Converters Processes as Noise Gate up to 512 taps FIR filters OR up to 48dB Oct IIR Hp Lp filters for X over parametric EQs per input...

Страница 2: ...FIR type and the Out Band attenuation or importing from external application the FIR coefficients as txt file IIR Crossover filters with slopes from 6dB Octave up to 48dB Octave including Butterworth...

Страница 3: ...20 kHz 8 load Frequency Response 20Hz 20kHz 0 5 dB Power Supply Switch mode power supply with PFC Power Factor Correction and integral standby converter Operating Range Universal Mains 85 265V Consump...

Страница 4: ...applications Crossover section IIR HPF LPF Butterworth 6 12 18 24 48dB Octave Linkwitz Riley 12 24 36 48dB Octave Bessel 12 24dB Octave Filter resolution 1Hz Input Special Filters FIR up to 512 Taps f...

Страница 5: ...witch Red LED Power Yellow LED Link Green LED Signal presence 1 x XLR female connector Input 1 x XLR male connector Link Output 2 x RJ45 connector M LAN Rs485 IEC C13 16A connector Power on off switch...

Страница 6: ...Processes Block Scheme...

Страница 7: ...e that the Net Framework 4 0 is already installed on the PC used After install the setup exe and run the app PDA500PF then the system show the following window and after few seconds the main window Th...

Страница 8: ...l units can be connected in Network and to be controlled by the same Pc sw If only one unit with a defined Id is connected to the remote control in order to control it will be enough to select as conn...

Страница 9: ...he Sw will show a list of the devices found if no device are found then is possible to continue in demo mode Off line on the window List ID If no devices found the Sw will ask if the user want to cont...

Страница 10: ...hose parameters strictly related t the cabinet itself and its set up and not instead used for creating different sounding styles which are left to the user in terms of Input parameters set up On the b...

Страница 11: ...ted preset If the Pc will be connected for an Editing Session the Pc connection time will read the Current input buffer the Fixed output parameters area and the System variables are and show the curre...

Страница 12: ...Configuration from one of 8 available locations within the PDA500PF The configuration loaded will be the one edited with its parameters set on the Input editing window The stored Preset within the uni...

Страница 13: ...s a Balanced Analog one coming from the the Front Panel XLR connector Noise Generator frame In alternative to the Analog Input a Noise Generator can be sent to the DSP processes and to the PDA500PF ou...

Страница 14: ...this case the FIR turn to be a up to 512 Taps standard FIR which can be loaded with any sort of coefficients for getting any sort of result PEQ Min Phase Lin Phase etc For the use of the external coe...

Страница 15: ...The 2dBu 0dBV represent the Input Level at the one the boost on both Lows and Highs stops maintaining a constant value up to the Max input level of 12dBV The level of 16dBu which is 18dBV is the Input...

Страница 16: ...ocesses and Input levels close to the max accepted by the unit The process is active ONLY in case of Overflow occurring when the signal is not exceeding with the sum of the Input level and the process...

Страница 17: ...g a wide list of filters type which can be selected for each filter of the parametric Eq The available filters are Bell constant Q Hi Low Shelving Q Symmetrical with variable Q Lp Hp Q 12dB Oct second...

Страница 18: ...f Classic types is available there where the APEC sw is used for a cabinet working with a separate SUB RMS Compressor the PDA500PF is implementing a powerful RMS compressor on Inputs and Outputs which...

Страница 19: ...ng a wide list of filters type which can be selected for each filter of the parametric Eq The available filters are Bell constant Q Hi Low Shelving Q Symmetrical with variable Q Lp Hp Q 12dB Oct secon...

Страница 20: ...max input delay 680ms 231meter RMS Compressor the PDA500PF is implementing a powerful RMS compressor on Inputs and Outputs which compression coefficient is calculated on the base of tabled values givi...

Страница 21: ...lowest than 250Hz Back the the X over for cutting frequencies lower than 250Hz of for any other reason coming from the user IIR classic Lp Hp filters can be used IIR X over If selecting IIR in the Sel...

Страница 22: ...Hz step 1Hz c select the number of the Num Taps of the FIR from 256 to 512 The FIR latency is dependent from the number of the taps and being the FIR running at 48kHz the latency can be calculated as...

Страница 23: ...ng from Third Party Sw EXT Icon here external coefficients can be imported into the FIR Clicking on the EXT Icon button the following window open and from the clicking on the LOAD icon a txt file see...

Страница 24: ...s for Hp Lp for low frequencies and still have FIR filters available let say for further filtering as PEQ one or any sort of phase configuration then the user can operate in the following way sacrific...

Страница 25: ...4dB Oct Two Cells Q1 0 55 Q2 1 30 36dB Oct Three Cells Q1 1 95 Q2 0 70 Q3 0 50 48dB Oct Four Cells Q1 2 55 Q2 0 90 Q3 0 60 Q4 0 50 Linkwitz Riley 12dB Oct One Cell Q1 0 70 24dB Oct Two Cells Q1 0 70 Q...

Страница 26: ...l to aid the user in optimizing the response of a loudspeaker but driver choice as well as good cabinet and Xover design still remain the primary steps to achieve the best sound quality In general bef...

Страница 27: ...R measurement to do this be sure you have an ASIO sound card a measurement microphone and at least a 4m x 5m x 4m L x W x H obstacle free measuring room if the available space is a little bit smaller...

Страница 28: ...arios For each measurement geometry the minimum distances between loudspeaker microphone and obstacles has been computed in order to maintain a minimum distance between 1 the direct sound wave path fr...

Страница 29: ...escribed 1 Loudspeaker system and microphone suspended at half height In this case the measurement space should be at least 4m x 5m x 4m L x W x H The microphone should be in axis with the loudspeaker...

Страница 30: ...contact with the floor The floor should be very reflecting smooth especially beneath the mic a fine metal sheet under the mic can be useful for this purpose As the picture below shows in this measurem...

Страница 31: ...g position The microphone should be in axis with the loudspeaker at an height of about 1 7m where the listener s head will stay So arrange the measurement choosing one of the three geometry setup and...

Страница 32: ...audio card and the right input output channels using the list box at the top of the screen Now click the Test button to start the microphone test making sure the loudspeaker amplifier volume is low T...

Страница 33: ...vity progress bar shows the activity completion status Wait in silence for the process completion After the sine sweep the Wizard starts the IR computation and the measured IR is plotted on the left g...

Страница 34: ...e position The calculation engine applies a windowing process to the first 10ms of the real IR centered on its peak value to remove unwanted obstacle reflections in such a way to provide an environmen...

Страница 35: ...estimate the frequency response below the reciprocal of the analisys time interval due to the time frequency duality So to avoid misleading view the frequency response plot shows a dotted line below 2...

Страница 36: ...olution between the IR and the FIR filter IRxFIR yellow line It represents the result of the IR compensation process that corresponds to what would be the IR if it is measured with FIR processing enab...

Страница 37: ...ow analize in more details the linearization capability of the computed FIR by comparing the time and frequency domain plots of the IR and the IRxFIR curves for a flat target magnitude In the time dom...

Страница 38: ...ion and on the poor resolution of the FIR filter at low frequencies The upper limit MaxFreq is a user defined parameter that will be described afterwards Moreover the time domain graph shows the laten...

Страница 39: ...e a target curve can be applied 2 Phase only In this mode the FIR filter works on the phase response only leaving the IR magnitude unchanged Max Frequency Before calculating the FIR the first thing th...

Страница 40: ...parameter implies that the FIR filter will totally compensate them with corresponding peaks in the FIR frequency response which can result in undesired audible ringing effects tonal components will be...

Страница 41: ...he magnitude response only or to both magnitude and phase For the magnitude smoothing the algorithm scans the frequency response of the FIR filter searching for frequency points where the magnitude is...

Страница 42: ...sabled right side plot smoothing enabled When the Magn Phase mode is selected the phase smoothing is always applied to the whole frequency range even if the threshold is not equal to 0dB The following...

Страница 43: ...peaker IR but in the most cases latency values greater or equal to 2 5ms allow to preserve almost unchanged the filter correction effects The following pictures compare the frequency responses both in...

Страница 44: ...shown In the EQ Target page the magnitude response of the target curve blue line of the FIR filter green line and of the IRxFIR yellow curve are overlaid Curves in the plot can be hidden through the c...

Страница 45: ...ton the gain of each parametric filter is set to 0dB to flatten the target curve Enabling the target curve smoothing allows to reduce unwanted ripples in the magnitude response when low frequency filt...

Страница 46: ...e user defined parameters the corresponding coefficients can be saved in a file and recalled from outside the Wizard or stored in the DSP to start listening tests To save the filter file click the Sav...

Страница 47: ...actual loudspeaker response resulting in a misleading behaviour To start the verify process click the Measure button at the top left of the screen and wait in silence After the sine sweep completion t...

Страница 48: ...can be imported by the PDA500PF FIRFormat txt 2 65204521320808E 06 2 1021137868951E 06 1 21276289563775E 06 6 87446664056699E 20 1 48474417799171E 06 3 15405377541534E 06 4 88738331652021E 06 6 53749...

Страница 49: ...51246854189579E 05 7 04374224066184E 05 7 10458124187932E 05 6 64831793625681E 05 5 66308487325442E 05 4 17571192459109E 05 2 2529917126749E 05 5 1102251664014E 19 2 44463930985027E 05 4 9164275940912...

Страница 50: ...46844024973327E 04 3 11394337610545E 04 3 57669445636436E 04 3 81252688006995E 04 3 79096460903092E 04 3 49823599314919E 04 2 93925151201513E 04 2 13834135389745E 04 1 13862779262699E 04 2 32781645487...

Страница 51: ...754106962361E 04 5 92711089812363E 04 8 57878299265353E 04 1 07523500572324E 03 1 22719631042901E 03 1 29997245187562E 03 1 28472205062605E 03 1 17840786798259E 03 9 84280657644286E 04 7 1193976140140...

Страница 52: ...260002143754E 04 2 41680933904185E 18 8 70511607402655E 04 1 71974422513146E 03 2 48730388211796E 03 3 11574350200798E 03 3 55469356139325E 03 3 76468640395981E 03 3 7203963474693E 03 3 4130460571094E...

Страница 53: ...00210620593568E 03 5 89351721415639E 03 3 18184942298687E 03 3 14510315200239E 18 3 47724295915889E 03 7 04063460307877E 03 1 04563210050968E 02 0 01347762835209 1 58581902470997E 02 1 73657103968249E...

Страница 54: ...8581902470997E 02 0 01347762835209 1 04563210050968E 02 7 04063460307877E 03 3 47724295915889E 03 3 14510315200239E 18 3 18184942298687E 03 5 89351721415639E 03 8 00210620593568E 03 9 42131370559473E...

Страница 55: ...203963474693E 03 3 76468640395981E 03 3 55469356139325E 03 3 11574350200798E 03 2 48730388211796E 03 1 71974422513146E 03 8 70511607402655E 04 2 41680933904185E 18 8 3260002143754E 04 1 57319495244998...

Страница 56: ...280657644286E 04 1 17840786798259E 03 1 28472205062605E 03 1 29997245187562E 03 1 22719631042901E 03 1 07523500572324E 03 8 57878299265353E 04 5 92711089812363E 04 2 99754106962361E 04 1 3855551722280...

Страница 57: ...2779262699E 04 2 13834135389745E 04 2 93925151201513E 04 3 49823599314919E 04 3 79096460903092E 04 3 81252688006995E 04 3 57669445636436E 04 3 11394337610545E 04 2 46844024973327E 04 1 69425708251993E...

Страница 58: ...463930985027E 05 5 1102251664014E 19 2 2529917126749E 05 4 17571192459109E 05 5 66308487325442E 05 6 64831793625681E 05 7 10458124187932E 05 7 04374224066184E 05 6 51246854189579E 05 5 58617787966219E...

Страница 59: ...8E 06 3 87819635557018E 06 3 4267786230259E 20 3 37585149784821E 06 6 06932382028795E 06 7 97338946695563E 06 9 05364538873791E 06 9 34231057722965E 06 8 92767141156887E 06 7 94029938736576E 06 6 5374...

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