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Impulse Noise Generation
(Forensics Version Only) Sometimes it is desirable to be able to generate Random Impulsive Noise. One application involves room acoustical propagation delay testing. Another application is theatrical in nature; that is to say that a modern recording may need to have some “aged patina” added to give it the sound of a time gone by and contemporaneous with the time of a particular theatrical performance.
The following Presets can be found under the Multi-Filter for Random Impulse Creation:
The first set of 5 presets will allow you to generate Random Impulses using the DC Forensics version of the software. You will need to start with a "Makes Waves" file consisting of Monophonic, 44.1 kHz, 16 bit Random noise at the -10 dB level. Next, apply the resultant signal to any of the first five presets in your Multi-Filter and the result will be randomized impulses of varying characteristics. This signal can be used to simulate an olde recording by “Paste Adding” it to a modern recording. (Please refer to the Bandpass Filter preset listing for additional theatrical sound simulations.) If you do not have the DC Forensics version of the software, download the DC Forensics / Forensics demo from our website located at www.diamondcut.com and use it to create the file that you desire. If you need more than a one- minute duration of random impulses, use the concatenate function in your DCArt10 software to elongate it.
*The sixth preset (78 RPM Record Simulator) requires a different stimulus signal that can be created using the following procedure:
1. Create a Make Waves file of Random Noise, - 10 dB, 16 bits, 44.1 kHz, Mono, 30 seconds long (which represents 39.00 revolutions of the record).
2. Copy that file to the clipboard.
3. Create a Make Waves file of Sine waves, 1.3 Hz, -30 dB, 16 bits, 44.1 kHz, Mono, 30 seconds long.
4. Paste Mix this file to the one on your clipboard.
5. Apply the White to Impulse Noise Converter.
6. Preview and/or Run that filter preset on the file that you had just created.
The resultant file, (or concatenated groups of files) when added to a musical source, will give you an excellent simulation of 78 RPM record crackle which can be useful if you are trying to create an artistic effect for theatrical purposes.
If you need to perform acoustical room propagation delay testing, use White to Impulse Noise Converter 5. If you only want one impulsive event every 10 seconds, use the Edit/Mute function to establish that relationship. If you need to modify the shape of the impulse(s), Zoom-In and use the Pencil Tool to make the desired changes.
Note: If you desire a stereophonic simulation of Impulsive Noise, simply “Make Waves” in stereo instead of mono. Then, use the file conversion filter to create stereo using a time offset value of 20 mSec before applying the stimulus signal to the White Impulse Noise Converter preset of choice.
(Forensics Version Only) Sometimes it is desirable to be able to generate Random Impulsive Noise. One application involves room acoustical propagation delay testing. Another application is theatrical in nature; that is to say that a modern recording may need to have some “aged patina” added to give it the sound of a time gone by and contemporaneous with the time of a particular theatrical performance.
The following Presets can be found under the Multi-Filter for Random Impulse Creation:
- White to Impulse Noise Converter 1 (45 RPM Low Cost Record Player Simulator)
- White to Impulse Noise Converter 2 (33 RPM Low Cost Record Player Simulator)
- White to Impulse Noise Converter 3 (45 RPM Hi-Fi Quality Record Simulator)
- White to Impulse Noise Converter 4 (33 RPM Hi-Fi Quality Record Simulator)
- White to Impulse Noise Converter 5 (Radio Static Simulator / Acoustical Test Signal)
- White to Impulse Noise Converter 6 (78 RPM Record Simulator *)
The first set of 5 presets will allow you to generate Random Impulses using the DC Forensics version of the software. You will need to start with a "Makes Waves" file consisting of Monophonic, 44.1 kHz, 16 bit Random noise at the -10 dB level. Next, apply the resultant signal to any of the first five presets in your Multi-Filter and the result will be randomized impulses of varying characteristics. This signal can be used to simulate an olde recording by “Paste Adding” it to a modern recording. (Please refer to the Bandpass Filter preset listing for additional theatrical sound simulations.) If you do not have the DC Forensics version of the software, download the DC Forensics / Forensics demo from our website located at www.diamondcut.com and use it to create the file that you desire. If you need more than a one- minute duration of random impulses, use the concatenate function in your DCArt10 software to elongate it.
*The sixth preset (78 RPM Record Simulator) requires a different stimulus signal that can be created using the following procedure:
1. Create a Make Waves file of Random Noise, - 10 dB, 16 bits, 44.1 kHz, Mono, 30 seconds long (which represents 39.00 revolutions of the record).
2. Copy that file to the clipboard.
3. Create a Make Waves file of Sine waves, 1.3 Hz, -30 dB, 16 bits, 44.1 kHz, Mono, 30 seconds long.
4. Paste Mix this file to the one on your clipboard.
5. Apply the White to Impulse Noise Converter.
6. Preview and/or Run that filter preset on the file that you had just created.
The resultant file, (or concatenated groups of files) when added to a musical source, will give you an excellent simulation of 78 RPM record crackle which can be useful if you are trying to create an artistic effect for theatrical purposes.
If you need to perform acoustical room propagation delay testing, use White to Impulse Noise Converter 5. If you only want one impulsive event every 10 seconds, use the Edit/Mute function to establish that relationship. If you need to modify the shape of the impulse(s), Zoom-In and use the Pencil Tool to make the desired changes.
Note: If you desire a stereophonic simulation of Impulsive Noise, simply “Make Waves” in stereo instead of mono. Then, use the file conversion filter to create stereo using a time offset value of 20 mSec before applying the stimulus signal to the White Impulse Noise Converter preset of choice.