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Fixing the Roar

 

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 SREV1 Sampling Guide

 

Fixing the Roar

 

As the reverberation decays, the extraneous noise captured in the impulse-response 
data becomes relatively louder and can create a roaring sound. This can be seen clearly 
in IREdit by setting the vertical axis to dB.

This issue can be resolved by fading out the extraneous noise at the end of the sample, 
so that the reverberation decays naturally. You can do this by using the Fade Out func-
tion of IREdit.

The following image shows a region of extraneous noise selected prior to fading.

The following image shows the data after the fade out.

If you fade out the extraneous noise so that its fade rate matches that of the reverb data 
(i.e., you achieve a linear-looking fade), the reverberation may decay too quickly and 
sound unnatural. In some cases, a better result can be achieved by fading out the noise 
less steeply.

Summary of Contents for S Rev1

Page 1: ...SREV1 Sampling Guide An Introduction to Impulse response Sampling with the SREV1 Sampling Reverberator...

Page 2: ...Placement 6 2 Sampling Tutorial 7 Configuring IRSampler 7 Checking the Generator Output 9 Setting Input Levels Automatically 9 Actual Sampling 9 Using Your Data on the SREV1 10 3 Data Editing 11 Fixi...

Page 3: ...to add it to a vocal or instrument sound was to actually perform in that space and record the resulting sound With the introduction of the SREV1 however it s now possible to sample the reverberation...

Page 4: ...then picked up by a number of microphones and returned back to the SREV1 for processing The acquired data can be saved onto PC Card edited as neces sary using IREdit and then loaded into the SREV1 to...

Page 5: ...ly similar to the sound of an impulse this is akin to hearing an impulse response What you heard were the reverberation character istics of that acoustic space your hands being the audio source your e...

Page 6: ...listening Be careful with your volume level settings when using TSPs This higher level allows us to capture data with a better S N ratio than that possible using an impulse signal Of course simply ou...

Page 7: ...iorecordingshouldbeadequate ThePAsystemshouldhave a wide flat range and enough power to energize the reverberation you want to capture The better the equipment the more faithful the end results will b...

Page 8: ...which the SREV1 is connected The selected COM port is used automatically the next time IRSampler is started but can be changed at any time by choosing COM Port from the Setup menu Choose COM1 or COM2...

Page 9: ...ger window Assign the Sampler Inputs as follows Channel 1 Slot 1 1 Channel 2 Slot 1 2 Channel 3 Slot 1 3 Channel 4 Slot 1 4 Input Levels Main window Set the Sampler Input level faders as follows Chann...

Page 10: ...t appears in the Status box In addition to setting the input level faders the Level Adjust function automatically cal culates and sets the CNV Convolution Bit Shift parameter which is used to normaliz...

Page 11: ...OAD button and press ENTER to access the Data Load page Next select the PCMCIA button and press the ENTER button Your impulse response data should appear in the list of files Use the DATA wheel or the...

Page 12: ...nd of the reverberation An unwanted delay at the beginning of the reverberation Direct sound in the sample is making it unusable The reverberation is too loud These issues are addressed in the followi...

Page 13: ...at the end of the sample so that the reverberation decays naturally You can do this by using the Fade Out func tion of IREdit The following image shows a region of extraneous noise selected prior to f...

Page 14: ...onsedatamaycontainaspatialdelayatthebeginningduetothetime it takes the pulse to reach the microphone from the speaker In some cases this may be a hindrance and can be deleted by using the IREdit Cut f...

Page 15: ...crophones directly from the speakers In order to use the Reverb Balance parameter or to create a mix of dry and wet signals on your mixer it s best to remove the direct sound component which you can d...

Page 16: ...resolved by editing the header information with IREdit In IREdit choose Header from the Tools menu The Edit Header window appears dis playing various information about the data as shown below One of t...

Page 17: ...ch the SREV1 begins exponentially attenuating the reverb data Essentially reverberation consists of two components the early reflections and the main reverb which follows Early reflections define the...

Page 18: ...k up the rever berating sound which is fed back to the analog SREV1 inputs via the mic preamp Hall PC running IRSampler Power Amp Mic Preamp FL FR RL RR AC IN SLOT 1 SLOT 2 WORD CLOCK IN REMOTE 2 OUT...

Page 19: ...ll PC running IRSampler Power Amp Mic Preamp D A A D FL FR RL RR SREV1 AES EBU AES EBU IRSampler configuration Channel mode 4ch Trigger source Internal Generator output AES EBU1 1 Input Ch 1 AES EBU1...

Page 20: ...ng fluctuating waveforms such as acoustic reverberation since they provide the kind of simultaneousness across tracks necessary for accurate averaging Step 1 Recording Pulses on the Digital Recorder T...

Page 21: ...SREV1 The final step is to sample the recorded responses into the SREV1 using the trigger sig nal previously recorded on track 2 to trigger sampling as shown below Hall D A A D Power Amp Mic Amp FL F...

Page 22: ...YAMAHA CORPORATION Pro Audio Digital Musical Instrument Division P O Box 3 Hamamatsu 430 8651 Japan...

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