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Audiofrog BMH-1 User Manual

Binaural head microphone
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BMH-1
Binaural Head Microphone
User Guide

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Summary of Contents for Audiofrog BMH-1

  • Page 1 BMH-1 Binaural Head Microphone User Guide...
  • Page 2 The preamp is designed for equipment with an input impedance of or high- er than 1kΩ. If you suspect a problem with your BHM-1, please contact us through the contact form at www.audiofrog.com, or email us at customerservice@audiofrog.com.
  • Page 3 The measurements have been saved as simple .txt files and can be easily imported into many measurement and analysis programs. The complete set of measurements is available for download on the BHM-1 section of www.audiofrog.com. When we listen to a binaural recording (made with a head microphone) through headphones, the timing of the arrival of sounds and their frequency responses recorded by the head microphone--the head microphone’s...
  • Page 4 present. Plug the BHM-1 into your chosen audio interface. Press record in your recording program or app and record the event. Once you have made the saved the recording, you may want to import it into a digital audio workstation to adjust levels, clip out silence at the beginning or the end of the track or edit or remix the track in some other way.
  • Page 5 Connections: 1. 9V Battery Compartment: 9 V battery is only necessary if you intend to use the 3.5 mm stereo line output (4). Press to release the clip and slide the battery drawer away from the base to install the battery. 2.
  • Page 6 Connection pin out diagrams: 3.5mm (2-9V) 3.5mm (Stereo) XLR (48V) Ring Sleeve Sleeve Tip: Signal + Tip: Left Signal + 1: Ground (Shield) Sleeve: Signal - (ground) Ring: Right Signal + 2: Positive (Hot) Sleeve: Signal - (ground) 3: Negative (Cold) Refer to the drawings above when considering how you will connect your BHM-1 to other equipment.
  • Page 7 1. Connect R and L XLR outputs to R and L XLR inputs of the interface. 2. Set BMH-1’s output switch to “XLR 48V”. 3. The interface phantom power will power the microphones, so there is no need to turn on the pre- amp.
  • Page 8 Connecting to a consumer audio device’s line level input: 3.5mm to Stereo RCA Adapter Stereo 3.5mm Stereo RCA 1. Connect the Stereo output to the stereo line level input of the consumer device. A “Y” adapter or a 3.5 mm to stereo RCA adapter may be required. 2.
  • Page 9 Connecting the BHM-1 to a camera or a video camera: Stereo (TRS) to two Mono (TS) adapter 1. Consult your camera’s owner’s manual to confirm that the microphone input is a stereo input. If your camera has an input labeled “mic” it probably includes bias voltage sufficient for the BHM-1 Left and Right 3.5 mm Outputs.
  • Page 10 Connecting to a phone using a Rode AI Micro (available from Rode Microphones at www.Rode.com) Rode Microphones makes a handy solution that will connect your BHM-1 to a phone using a USB connection. It will work with PCs and Macs, too. It comes with a convenient phone app to make recording and saving files on your phone easy.
  • Page 11 Appendix: Equalization for playback over speakers: Recordings made with a binaural head work when we listen to them over headphones, because the headphones play sound directly into our ears without the influence of our own HRTF. The head microphone’s HRTF is substituted for our own. If you want to listen to the binaural recordings you make with the BHM-1 over loudspeakers in a room, there will still be some, however greatly reduced, spatial effect.
  • Page 12 Polar plots depicting frequency response over elevation are limited to the forward angles. See the next page for a complete map of the measurement locations. You can download the normalized data as text files in the BHM-1 section at www.audiofrog.com.
  • Page 13 Measurement positions 0° Elevation 0˚ Elevation, 180° Azimuth 0˚ Elevaton, 270° Azimuth 0˚ Elevation, 90° Azimuth 0˚ Elevation, 0° Azimuth In the graphs on the following pages each of the curves depicted 90° Elevation, 0˚ Azimuth in the frequency response plots will be named according to the convention described in the graphics on this page:...
  • Page 14 Graphics on this page depict all of the measurement positions represented in the graphs on the following pages and in the text files available for download. The baseline position, 0˚ Elevation, 0˚ Azimuth is highlighted in red below. 0˚ Elevation, 0˚ Azimuth...
  • Page 15 90° Elevation dBSPL 100 Hz 1: 90E 0A.txt 4: 90E 45A.txt 7: 90E 90A.txt 10: 90E 135A.txt 2: 90E 15A.txt 5: 90E 60A.txt 8: 90E 105A.txt 11: 90E 150A.txt 3: 90E 30A.txt 6: 90E 75A.txt 9: 90E 120A.txt 12: 90E 165A.txt 13: 90E 180A.txt 16: 90E 225A.txt 19: 90E 270A.txt...
  • Page 16 75° Elevation dBSPL 100 Hz 1: 75E 0A.txt 4: 75E 45A.txt 7: 75E 90A.txt 10: 75E 135A.txt 2: 75E 15A.txt 5: 75E 60A.txt 8: 75E 105A.txt 11: 75E 150A.txt 3: 75E 30A.txt 6: 75E 75A.txt 9: 75E 120A.txt 12: 75E 165A.txt 13: 75E 180A.txt 16: 75E 225A.txt 19: 75E 270A.txt...
  • Page 17 60° Elevation dBSPL 100 Hz 1: 60E 0A.txt 4: 60E 45A.txt 7: 60E 90A.txt 10: 60E 135A.txt 2: 60E 15A.txt 5: 60E 60A.txt 8: 60E 105A.txt 11: 60E 150A.txt 3: 60E 30A.txt 6: 60E 75A.txt 9: 60E 120A.txt 12: 60E 165A.txt 13: 60E 180A.txt 16: 60E 225A.txt 19: 60E 270A.txt...
  • Page 18 45° Elevation dBSPL 100 Hz 1: 45E 0A.txt 4: 45E 45A.txt 7: 45E 90A.txt 10: 45E 135A.txt 2: 45E 15A.txt 5: 45E 60A.txt 8: 45E 105A.txt 11: 45E 150A.txt 3: 45E 30A.txt 6: 45E 75A.txt 9: 45E 120A.txt 12: 45E 165A.txt 13: 45E 180A.txt 16: 45E 225A.txt 19: 45E 270A.txt...
  • Page 19 30° Elevation dBSPL 100 Hz 1: 30E 0A.txt 4: 30E 45A.txt 7: 30E 90A.txt 10: 30E 135A.txt 2: 30E 15A.txt 5: 30E 60A.txt 8: 30E 105A.txt 11: 30E 150A.txt 3: 30E 30A.txt 6: 30E 75A.txt 9: 30E 120A.txt 12: 30E 165A.txt 13: 30E 180A.txt 16: 30E 225A.txt 19: 30E 270A.txt...
  • Page 20 15° Elevation dBSPL 100 Hz 1: 15E 0A.txt 4: 15E 45A.txt 7: 15E 90A.txt 10: 15E 135A.txt 2: 15E 15A.txt 5: 15E 60A.txt 8: 15E 105A.txt 11: 15E 150A.txt 3: 15E 30A.txt 6: 15E 75A.txt 9: 15E 120A.txt 12: 15E 165A.txt 13: 15E 180A.txt 16: 15E 225A.txt 19: 15E 270A.txt...
  • Page 21 0° Elevation dBSPL 100 Hz 1: 0E 0A.txt 4: 0E 45A.txt 7: 0E 90A.txt 10: 0E 135A.txt 2: 0E 15A.txt 5: 0E 60A.txt 8: 0E 105A.txt 11: 0E 150A.txt 3: 0E 30A.txt 6: 0E 75A.txt 9: 0E 120A.txt 12: 0E 165A.txt 13: 0E 180A.txt 16: 0E 225A.txt 19: 0E 270A.txt...
  • Page 22 -15° Elevation dBSPL 100 Hz 1: -15E 0A.txt 4: -15E 45A.txt 7: -15E 90A.txt 10: -15E 135A.txt 2: -15E 15A.txt 5: -15E 60A.txt 8: -15E 105A.txt 11: -15E 150A.txt 3: -15E 30A.txt 6: -15E 75A.txt 9: -15E 120A.txt 12: -15E 165A.txt 13: -15E 180A.txt 16: -15E 225A.txt 19: -15E 270A.txt...
  • Page 23 -30° Elevation dBSPL 100 Hz 1: -30E 0A.txt 4: -30E 45A.txt 7: -30E 90A.txt 10: -30E 135A.txt 2: -30E 15A.txt 5: -30E 60A.txt 8: -30E 105A.txt 11: -30E 150A.txt 3: -30E 30A.txt 6: -30E 75A.txt 9: -30E 120A.txt 12: -30E 165A.txt 13: -30E 180A.txt 16: -30E 225A.txt 19: -30E 270A.txt...
  • Page 24 -45° Elevation dBSPL 100 Hz 1: 0E 0A.txt 4: 0E 45A.txt 7: 0E 90A.txt 10: 0E 135A.txt 2: 0E 15A.txt 5: 0E 60A.txt 8: 0E 105A.txt 11: 0E 150A.txt 3: 0E 30A.txt 6: 0E 75A.txt 9: 0E 120A.txt 12: 0E 165A.txt 13: 0E 180A.txt 16: 0E 225A.txt 19: 0E 270A.txt...
  • Page 25 -60° Elevation dBSPL 100 Hz 1: -60E 0A.txt 4: -60E 45A.txt 7: -60E 90A.txt 10: -60E 135A.txt 2: -60E 15A.txt 5: -60E 60A.txt 8: -60E 105A.txt 11: -60E 150A.txt 3: -60E 30A.txt 6: -60E 75A.txt 9: -60E 120A.txt 12: -60E 165A.txt 13: -60E 180A.txt 16: -60E 225A.txt 19: -60E 270A.txt...
  • Page 26 -75° Elevation dBSPL 100 Hz 1: -75E 0A.txt 4: -75E 45A.txt 7: -75E 90A.txt 10: -75E 135A.txt 2: -75E 15A.txt 5: -75E 60A.txt 8: -75E 105A.txt 11: -75E 150A.txt 3: -75E 30A.txt 6: -75E 75A.txt 9: -75E 120A.txt 12: -75E 165A.txt 13: -75E 180A.txt 16: -75E 225A.txt 19: -75E 270A.txt...
  • Page 27 0° Azimuth dBSPL 100 Hz 1: 90E 0A.txt 4: 45E 0A.txt 7: 0E 0A.txt 10: -45E 0A.txt 2: 75E 0A.txt 5: 30E 0A.txt 8: -15E 0A.txt 11: -60E 0A.txt 3: 60E 0A.txt 6: 15E 0A.txt 9: -30E 0A.txt 12: -75E 0A.txt 0°...
  • Page 28 15° Azimuth dBSPL 100 Hz 1: 90E 15A.txt 4: 45E 15A.txt 7: 0E 15A.txt 10: -45E 15A.txt 2: 75E 15A.txt 5: 30E 15A.txt 8: -15E 15.txt 11: -60E 15A.txt 3: 60E 15A.txt 6: 15E 15A.txt 9: -30E 15A.txt 12: -75E 15A.txt 15°...
  • Page 29 30° Azimuth dBSPL 100 Hz 1: 90E 30A.txt 4: 45E 30A.txt 7: 0E 30A.txt 10: -45E 30A.txt 2: 75E 30A.txt 5: 30E 30A.txt 8: -15E 30A.txt 11: -60E 30A.txt 3: 60E 30A.txt 6: 15E 30A.txt 9: -30E 30A.txt 12: -75E 30A.txt 30°...
  • Page 30 45° Azimuth dBSPL 100 Hz 1: 90E 45A.txt 4: 45E 45A.txt 7: 0E 45A.txt 10: -45E 45A.txt 2: 75E 45A.txt 5: 30E 45A.txt 8: -15E 45A.txt 11: -60E 45A.txt 3: 60E 45A.txt 6: 15E 45A.txt 9: -30E 45A.txt 12: -75E 45A.txt 45°...
  • Page 31 60° Azimuth dBSPL 100 Hz 1: Import: 90E 60A.txt 4: Import: 45E 60A.txt 7: Import: 0E 60A.txt 10: Import: -45E 60A.txt 2: Import: 75E 60A.txt 5: Import: 30E 60A.txt 8: Import: -15E 60A.txt 11: Import: -60E 60A.txt 3: Import: 60E 60A.txt 6: Import: 15E 60A.txt 9: Import: -30E 60A.txt 12: Import: -75E 60A.txt...
  • Page 32 75° Azimuth dBSPL 100 Hz 1: 90E 75A.txt 4: 45E 75A.txt 7: 0E 75A.txt 10: -45E 75A.txt 2: 75E 75A.txt 5: 30E 75A.txt 8: -15E 75A.txt 11: -60E 75A.txt 3: 60E 75A.txt 6: 15E 75A.txt 9: -30E 75A.txt 12: -75E 75A.txt 75°...
  • Page 33 90° Azimuth dBSPL 100 Hz 1: 90E 90A.txt 4: 45E 90A.txt 7: 0E 90A.txt 10: -45E 90A.txt 2: 75E 90A.txt 5: 30E 90A.txt 8: -15E 90A.txt 11: -60E 90A.txt 3: 60E 90A.txt 6: 15E 90A.txt 9: -30E 90A.txt 12: -75E 90A.txt 90°...
  • Page 34 105° Azimuth dBSPL 100 Hz 1: 90E 105A.txt 4: 45E 105A.txt 7: 0E 105A.txt 10: -45E 105A.txt 2: 75E 105A.txt 5: 30E 105A.txt 8: -15E 105A.txt 11: -60E 105A.txt 3: 60E 105A.txt 6: 15E 105A.txt 9: -30E 105A.txt 12: -75E 105A.txt 105°...
  • Page 35 120° Azimuth dBSPL 100 Hz 1: 90E 120A.txt 4: 45E 120A.txt 7: 0E 120A.txt 10: -45E 120A.txt 2: 75E 120A.txt 5: 30E 120A.txt 8: -15E 120A.txt 11: -60E 120A.txt 3: 60E 120A.txt 6: 15E 120A.txt 9: -30E 120A.txt 12: -75E 120A.txt 120°...
  • Page 36 135° Azimuth dBSPL 100 Hz 1: 90E 135A.txt 4: 45E 135A.txt 7: 0E 135A.txt 10: -45E 135A.txt 2: 75E 135A.txt 5: 30E 135A.txt 8: -15E 135A.txt 11: -60E 135A.txt 3: 60E 135A.txt 6: 15E 135A.txt 9: -30E 135A.txt 12: -75E 135A.txt 135°...
  • Page 37 150° Azimuth dBSPL 100 Hz 1: 90E 150A.txt 4: 45E 150A.txt 7: 0E 150A.txt 10: -45E 150A.txt 2: 75E 150A.txt 5: 30E 150A.txt 8: -15E 150A.txt 11: -60E 150A.txt 3: 60E 150A.txt 6: 15E 150A.txt 9: -30E 150A.txt 12: -75E 150A.txt 150°...
  • Page 38 165° Azimuth dBSPL 100 Hz 1: 90E 165A.txt 4: 45E 165A.txt 7: 0E 165A.txt 10: -45E 165A.txt 2: 75E 165A.txt 5: 30E 165A.txt 8: -15E 165A.txt 11: -60E 165A.txt 3: 60E 165A.txt 6: 15E 165A.txt 9: -30E 165A.txt 12: -75E 165A.txt 165°...
  • Page 39 180° Azimuth dBSPL 100 Hz 1: 90E 180A.txt 4: 45E 180A.txt 7: 0E 180A.txt 10: -45E 180A.txt 2: 75E 180A.txt 5: 30E 180A.txt 8: -15E 180A.txt 11: -60E 180A.txt 3: 60E 180A.txt 6: 15E 180A.txt 9: -30E 180A.txt 12: -75E 180A.txt 180°...
  • Page 40 195° Azimuth dBSPL 100 Hz 1: 90E 195A.txt 4: 45E 195A.txt 7: 0E 195A.txt 10: -45E 195A.txt 2: 75E 195A.txt 5: 30E 195A.txt 8: -15E 195A.txt 11: -60E 195A.txt 3: 60E 195A.txt 6: 15E 195A.txt 9: -30E 195A.txt 12: -75E 195A.txt 195°...
  • Page 41 210° Azimuth dBSPL 100 Hz 1: 90E 210A.txt 4: 45E 210A.txt 7: 0E 210A.txt 10: -45E 210A.txt 2: 75E 210A.txt 5: 30E 210A.txt 8: -15E 210A.txt 11: -60E 210A.txt 3: 60E 210A.txt 6: 15E 210A.txt 9: -30E 210A.txt 12: -75E 210A.txt 210°...
  • Page 42 225° Azimuth dBSPL 100 Hz 1: 90E 225A.txt 4: 45E 225A.txt 7: 0E 225A.txt 10: -45E 225A.txt 2: 75E 225A.txt 5: 30E 225A.txt 8: -15E 225A.txt 11: -60E 225A.txt 3: 60E 225A.txt 6: 15E 225A.txt 9: -30E 225A.txt 12: -75E 225A.txt 225°...
  • Page 43 240° Azimuth dBSPL 100 Hz 1: Import: 90E 240A.txt 4: Import: 45E 240A.txt 7: Import: 0E 240A.txt 10: Import: -45E 240A.txt 2: Import: 75E 240A.txt 5: Import: 30E 240A.txt 8: Import: -15E 240A.txt 11: Import: -60E 240A.txt 3: Import: 60E 240A.txt 6: Import: 15E 240A.txt 9: Import: -30E 240A.txt 12: Import: -75E 240A.txt...
  • Page 44 255° Azimuth dBSPL 100 Hz 1: 90E 255A.txt 4: 45E 255A.txt 7: 0E 255A.txt 10: -45E 255A.txt 2: 75E 255A.txt 5: 30E 255A.txt 8: -15E 255A.txt 11: -60E 255A.txt 3: 60E 255A.txt 6: 15E 255A.txt 9: -30E 255A.txt 12: -75E 225A.txt 255°...
  • Page 45 270° Azimuth dBSPL 100 Hz 1: 90E 270A.txt 4: 45E 270A.txt 7: 0E 270A.txt 10: 45E 270A.txt 2: 75E 270A.txt 5: 30E 270A.txt 8: -15E 270A.txt 11: -60E 270A.txt 3: 60E 270A.txt 6: 15E 270A.txt 9: -30E 270A.txt 12: -75E 270A.txt 270°...
  • Page 46 285° Azimuth dBSPL 100 Hz 1: Import: 90E 285A.txt 4: 45E 285A.txt 7: 0E 285A.txt 10: -45E 285A.txt 2: 75E 285A.txt 5: 30E 285A.txt 8: -15E 285A.txt 11: -60E 285A.txt 3: 60E 285A.txt 6: 15E 285A.txt 9: -30E 285A.txt 12: -75E 285A.txt 285°...
  • Page 47 300° Azimuth dBSPL 100 Hz 1: 90E 300A.txt 4: 45E 300A.txt 7: 0E 300A.txt 10: Import: -45E 300A.txt 2: 75E 300A.txt 5: 30E 300A.txt 8: Import: -15E 300A.txt 11: Import: -60E 300A.txt 3: 60E 300A.txt 6: 15E 300A.txt 9: Import: -30E 300A.txt 12: Import: -75E 300A.txt 300°...
  • Page 48 315° Azimuth dBSPL 100 Hz 1: 90E 315A.txt 4: 45E 315A.txt 7: 0E 315A.txt 10: -45E 315A.txt 2: 75E 315A.txt 5: 30E 315A.txt 8: -15E 315A.txt 11: -60E 315A.txt 3: 60E 315A.txt 6: 15E 315A.txt 9: -30E 315A.txt 12: -75E 315A.txt 315°...
  • Page 49 330° Azimuth dBSPL 100 Hz 1: 90E 330A.txt 4: 45E 330A.txt 7: 0E 330A.txt 10: Import: -45E 330A.txt 2: 75E 330A.txt 5: 30E 330A.txt 8: -15E 330A.txt 11: Import: -60E 330A.txt 3: 60E 330A.txt 6: 15E 330A.txt 9: -30E 330A.txt 12: Import: -75E 330A.txt 330°...
  • Page 50 345° Azimuth dBSPL 100 Hz 1: Import: 90E 345A.txt 4: Import: 45E 345A.txt 7: Import: 0E 345A.txt 10: Import: -45E 345A.txt 2: Import: 75E 345A.txt 5: Import: 30E 345A.txt 8: Import: -15E 345A.txt 11: Import: -60E 345A.txt 3: Import: 60E 345A.txt 6: Import: 15E 345A.txt 9: Import: -30E 345A.txt 12: Import: -75E 345A.txt...
  • Page 51 Audiofrog, Inc. 419 S. Mission Drive San Gabriel, CA 91776 www.audiofrog.com...