Audio Console Gain Compensation for Shared Microphone Preamps
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Solution Overview
Problem
The increasing use of digital consoles in audio systems necessitates a more efficient method for sharing a single microphone amplifier among multiple consoles, as analogue splitting systems are inefficient and can cause conflicts due to gain adjustments affecting other consoles, leading to increased costs and complexity.
Innovation Solution
An audio console system with a master console and slave consoles, where the master console includes an adjustable input amplifier and a direct out output amplifier that inversely adjusts the gain of the direct out output signal to maintain a constant system gain, allowing the slave consoles to share the audio signal without needing to adjust for changes in the input gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single microphone amplifier is shared among multiple digital consoles, then system costs are reduced through elimination of duplicated hardware components, but conflicts arise as operators may adjust gain and affect levels on other consoles
Solution Approach 1:
The system divides the console architecture into master and slave units, with the master console containing the microphone amplifier and slave consoles receiving distributed audio signals. This segmentation allows one amplifier to serve multiple consoles without gain adjustment conflicts, as each console operates independently with its own signal processing chain.
Solution Approach 2:
The master console acts as an intermediary between the microphone amplifier and slave consoles. It receives the audio signal, processes it through its own channels, and distributes the processed signal to slave consoles via audio connections. This intermediary role prevents direct gain adjustment conflicts while enabling resource sharing.
2Ease of operation
If analogue splitting system is used to distribute source signal to multiple consoles, then each console has independent amplifier control, but system complexity and cost increase due to duplicated hardware components
Solution Approach 1:
The master console performs multiple functions: it acts as both a full-featured mixing console and a signal distribution hub for slave consoles. The audio connections from master to slave consoles enable the master to serve multiple purposes, reducing the need for additional amplifiers while maintaining operational independence across the system.
Solution Approach 2:
Slave consoles receive copies of the audio signal processed by the master console. Instead of each console having its own amplifier, the system creates signal copies that are distributed to multiple consoles, eliminating the need for duplicated amplifier hardware while maintaining signal availability across all units.
3Quantity of substance
If multiple consoles share a single microphone amplifier, then infrastructure costs are reduced, but gain adjustments on one console affect levels on other consoles
Solution Approach 1:
The system segments the signal processing path so that the microphone amplifier resides exclusively in the master console, while slave consoles receive processed signal copies. This segmentation isolates the amplifier from direct control at slave consoles, preventing gain adjustment conflicts and maintaining level stability across the system.
Solution Approach 2:
The master console's audio processing channels act as an intermediary between the amplifier and slave consoles. Any gain adjustments at slave consoles affect only their local processing, not the amplifier output, because the master console mediates the signal distribution and maintains stable amplifier gain settings.
Data Source
AI summary
An audio console system includes an input for receiving an audio signal. The system may also include a user adjustable input amplifier which may amplify audio signals received from the input with a predefined gain. The system may additionally include a direct out output amplifier provided after the adjustable input amplifier. The direct out output amplifier may output a direct out output signal. The direct out output amplifier may adjust a gain of a signal transmitted from the adjustable input amplifier. The direct output amplifier may be configured in such a way, that, upon a user adjustment of the adjustable input amplifier, the direct out output amplifier may adjust the gain of the direct out output signal inversely to the adjustment of the input amplifier resulting in a predefined gain of the audio signal from the at least one input to the direct out output being maintained.