Sound reference pressure5/8/2023 ATSC Recommended Practice: Techniques for Establishing and Maintaining Audio Loudness for Digital Television (A/85:2013) RP 200:2012 - SMPTE Recommended Practice - Relative and Absolute Sound Pressure Levels for Motion-Picture Multichannel Sound Systems - Applicable for Analog Photographic Film Audio, Digital Photographic Film Audio and D-Cinema A Statistical Model That Predicts Listeners’ Preference Ratings of In-Ear Headphones: Part 1 – Listening Test Results and Acoustic Measurements A Statistical Model that Predicts Listeners’ Preference Ratings of Around-Ear and On-Ear Headphones Methods for the subjective assessment of small impairments in audio systems Dolby 5.1-Channel Music Production Guidelines *This is 80 dB 1 kHz if the headphones follow the Harman target curve. "Reference level for all channels except low frequency effects is calibrated by adjusting the audio chain such that a pink noise signal recorded at -20dB relative to full scale (0dB) creates 85dB sound pressure level as measured with a C weighted SPL meter at the seating locations." Or put more simply, using playback for movies as an example: Set the individual channel level controls, such as power amplifier gain controls, or gain controls on powered loudspeakers for the Sound Pressure Level measured C-weighted and slow. Keep your body perpendicular to the meter, off to one side, as the level can be affected by a strong reflection off your body.ħ. Put a sound level meter at the position of the center of the head of the normal position for the operator, pointing it at the loudspeaker channel in use. Play all channels except the subwoofer (which is calibrated separately) if calibrating for movies.Ħ. Play one channel at a time if calibrating for music or television. Copy the second test tone, band-limited pink noise at -20 dBFS, to each channel of the digital audio workstation.ĥ. Set the level of each channel in turn for the sine-wave test level for the meter in use, such as -20 dBFS for digital meters, or 0 VU for VU meters.Ĥ. You may keep the monitor level control low for the time being.ģ. Play the file, setting the output level controls of the workstation to unity gain, the console input to unity gain, and the console master level control to unity gain. Copy the first test tone, 1 kHz sine wave at -20 dBFS, to a digital audio workstation, and then copy it into each of the channels to be employed.Ģ. The human hearing system is non-linear, especially in the bass, so having a consistent playback level – a reference – is critical if the mix is to translate from one production house to another and audiences are to hear the director’s intent in terms of the balance in the soundtrack between dialog, effects and ambiance."ġ. "Reference level is a calibrated volume setting used for both movie production (in dubbing stages and post production houses) and reproduction (in screening rooms and theaters). It characterizes the acoustic gain of the reproduction channel in order to ensure the same sound pressure level in different listening rooms for the same excerpt." "The reference listening level is defined as a preferred listening level, produced with a given measuring signal at the reference listening point.
0 Comments
Leave a Reply. |