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Articles Jan-Feb 2023

Creating State-of-the-Art AUDIOVISUAL Experiences Surrounding The Statue of Unity New!

In PALM + AV-ICN's conference session titled 'AV Architect of the Year', Narendra Naidu, Chairman and MD, Rhino Engineers, talks about rendering jaw-dropping audiovisual technology for Gujarat's Statue of Unity and several other projects situated in its periphery... read more

Articles Jan-Feb 2023

Udaipur City Palace Comes Alive with Splat Studio & Dataton New!

Splat Studio makes use of Dataton's Watchout software to highlight India's culture and heritage on the palace's facade

The G20 Sherpa Meet in Udaipur, India witnessed a congregation of world leaders, who partook in key conversations on sustainable lifestyle, technological transformations, and more. The City of Lakes - the host of the G20 Sherpa Meet... read more

Articles Jan-Feb 2023

AV Innovations Galore at ISE Barcelona 2023 New!

ISE Barcelona 2023, held from January 31 - February 3, 2023 in Barcelona, Spain, witnessed a record-breaking footfall over the four-day show. Clocking in at 58,107 unique attendees from 155 countries around the world, the ISE Barcelona 2023 not only gave the global AV industry a much-needed push in the right direction after the two-year long COVID-19 pandemic... read more

Articles Jan-Feb 2023

BRINGING SOUND TO LIFE: Ashish Saksena on his Love & Passion for Live Sound Mixing New!

With more than 25 years of experience as a live sound engineer for musical stalwarts such as Shankar Ehsaan Loy and KK, Ashish Saksena has forged his craftsmanship with technical acumen in monitor mixing and Front of House mixing. But his expertise in sound engineering isn't restricted to the live stage. Even in the studio, Ashish knows how to make the mix dance to his own tunes. read more

Articles Nov-Dec 2022

Leading with LED New!

PALM + AV-ICN reports on the latest popular, reliable, and cost-effective LED video walls available in the Indian pro AV industry today. From Barco's TruePix to NEC E Series, these indoor LED video walls are here to change the conferencing game in the long run. read more

Articles Nov-Dec 2022

An 'AV'ant-Garde Fusion of Nature & Technology New!

Gujarat has always been a home to the greatest minds who believe in the concept of 'simple living, high thinking'. Be it Mohandas Karamchand Gandhi, Sardar Vallabh Bhai Patel, and India's current Prime Minister,Narendra Modi - these individuals have been a testimony to how a human being... read more

Articles Nov-Dec 2022

Active LED Video Walls - Demystifying The AV Enigma by Abdul Waheed, CTS, Managing Director, EYTE Technologies Pvt. Ltd. New!

The ever changing video market is reaching new heights with active LED video walls. From projection to plasma displays; LCD to LED, the continuous journey for large size display wall is always challenging. The indirect light of projection system, to the thick breaking lines of Bezel in LCD and LED is always disturbing the impact of the high resolution content. The cost of Micro LED panels and the alignment issues didn't allow it to be a success. read more

Articles Nov-Dec 2022

On Delivering Quality Mega Scale AV Projects in India New!

The PALM + AV-ICN conference session witnessed a panel of AV experts, Prashanth Govindhan, Claron D'souza, Abdul Waheed, and Kapil Thirwani sit for a dialogue on the evolution of Indian AV industry, how it differs from AV industries in other countries, and how moral is the concept of jugaad in the Indian AV sphere. In this article, read the highlights of the talk. read more

Articles Nov-Dec 2022

Mondosonic Studios' Varun Krrishna on Preferring Analog-Over-Digital SetupNew!

Varun Krrishna is not just a mixing engineer and music producer out of profession, but also out of passion. With an ardent love for music, Varun Krrishna is also the founder and owner of Mondosonic Studios in Kerala, a space he has built for music to breathe free. So, it isn’t a surprise that the man of music is always in a quest to stay abreast with the latest trends in the world of acoustics, and knows just how big the spatial audio boom is. To encapsulate the essence of spatial sound, Varun Krrishna is upgrading Mondosonic Studios with an extension for spatial audio. read more

Articles Nov-Dec 2022

Dialing it up: Ashish Saksena on how Monitor Mixing can Elevate a PerformanceNew!

What does it take to create a technically accurate monitor mix and put the stage performance on a pedestal? Ashish Saksena, Live Sound Engineer for Shankar Ehsaan Loy & Late KK, spills the beans on crafting a good monitor mix in PALM + AV-ICN conference session titled, 'How Good Monitor Mixing Can Boost A Performance.'read more


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Acoustic and Audio System Design for Small Rooms - Part 1

By - Rahul Sharma, CEO, Menura Acoustic Labs In collaboration with Sound Wizard





Acoustic and audio system design for a “small room” can be extremely challenging, especially for critical listening applications like control rooms and reference home cinemas. It is vital to understand the relationship between system design and acoustics, and to accept that neither aspect can be designed in isolation without considering the needs and requirements of the other. In this six part educational series, we will outline many important “small room” design considerations and along the way demonstrate how to effectively tackle common acoustical and system design problems


Small Rooms

Let us start by defining a “small” room, firstly so that you aren’t utterly disappointed at the end of the series, and secondly because understanding the distinction between small and large rooms is the key to digesting the completely different design approaches to both. In an attempt to keep theory to a minimum, lets just say that small rooms are those where the room boundaries are close enough to create modal issues in the lower frequencies. Extensive low frequency absorption is usually required, and since the first reflections of sound from room boundaries reach the listener extremely quickly, a great deal of care must be taken to prevent early reflections from colouring the direct signal. As a rule of thumb, a room whose largest dimension is under 20m or 65 ft can be considered to be a small room

In the first part of this series, we will focus on three basic acoustic and psychoacoustic phenomena whose understanding are critical to effective design; the Haas effect, comb filtering and phase shift.


Fig.1: The Haas Effect


Haas Effect

The simplest way to describe the Haas effect is through its other name, the precedence effect. If two sources of sound are separated in arrival time by less than approximately 40ms, they are perceived as one. Because of this, both sounds also appear to come from the same location, which ends up being the physical location from which the first sound reaches your ears. Because of this powerful psychoacoustic phenomenon, your brain locks into this physical location, and it then becomes very difficult for your brain to reset and convince itself that there are in fact two separate sources of sound in different locations.

Either the level of one has to be reduced significantly, or it has to be delayed by over 40ms. The implication of the Haas effect in small rooms is straight forward; your brain is unable to separate the direct signal from early reflections because the arrival times are too close together! Why is this bad? The short answer is comb filtering, but the concept of phase shift needs to be understood before we openthat can of worms.


Fig.2: Amplitude, Time Period and Frequency of a Wave


Phase Shift and Comb Filtering

As audio professionals, most of us are aware that every audible (and inaudibile) frequency has a corresponding wavelength. The time period defines the time it takes for one complete oscillation over that wavelength. While most audio signals are complex and never resemble a sine wave, we will still use one to illustrate our concept.

In the image below, two audio signals with the same amplitude (level), frequency response and wavelength BUT different arrival times have been added. Because of the different arrival times, the combination of constructive and destructive interference results in the “combing” you see in the image below. As you can imagine, this is not a desirable result.


Fig.3: Combing


The time delay created a phase shift in the wave, which combined with the original signal. Thanks to the Haas effect, this is the resultant wave we hear in a room. We sometimes mistakenly attribute the resultant wave to the audio system alone, when in fact it is a combination of the room and source. The colouration affects the spectral content of the sound waves, which goes against the main design goal of any listening space – transparency. The solution is to create a reflection-free zone, both through acoustic treatment and/or angling the walls of the listening room. Stay tuned as we dive deeper into acoustic and audio system design considerations for “small” rooms!

www.menuralabs.com

info@menuralabs.com

Current Issue : January - February 2023
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