Playback Loudness Monitoring During Media Replacement Events
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Solution Overview
Problem
During media content replacement events, playback devices often fail to detect and respond to user-adjusted volume changes, leading to a poor user experience as they lack access to volume playback information from the source device, resulting in apparent malfunctions or unresponsive volume controls.
Innovation Solution
The playback device monitors an audio signal corresponding to the replaced media content, measures loudness levels, and adjusts the volume of the new content based on detected user changes, even when volume information from the source is inaccessible, by analyzing shorter portions of content during replacements to quickly respond to volume adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the playback device uses a longer time constant to measure loudness levels, then measurement precision is improved, but response speed to volume changes deteriorates
Solution Approach 1:
The patent applies dynamics by making the time constant adaptive rather than fixed. The system dynamically adjusts the time constant based on whether a media replacement event is detected: using a first (longer) time constant during normal operation for precise loudness measurement, and switching to a second (shorter) time constant during media replacement events for rapid response to volume changes. This dynamic parameter adjustment resolves the contradiction between measurement precision and response speed.
Solution Approach 2:
The patent changes the parameter of time constant based on operational context. By detecting media replacement events and switching between different time constant values (first time constant vs. second time constant), the system optimizes both measurement precision and response speed for different operational states, resolving the inherent trade-off between these two parameters.
2Ease of operation
If the playback device monitors loudness levels continuously with longer time constant, then volume control responsiveness is improved, but device complexity increases
Solution Approach 1:
The patent segments the loudness monitoring operation into distinct modes based on media replacement event detection. Instead of using a single complex continuous monitoring system, the device divides operation into: (1) normal operation mode with first time constant, and (2) media replacement mode with second time constant. This segmentation simplifies the overall system design while maintaining responsiveness.
Solution Approach 2:
The system performs preliminary detection of media replacement events and prepares by switching to the appropriate time constant before volume adjustments are needed. This preliminary action allows the system to be ready for rapid response without requiring complex real-time analysis, thereby improving ease of operation without proportionally increasing device complexity.
3Speed
If the playback device uses shorter time constant during media replacement, then response speed to volume changes is improved, but measurement precision deteriorates
Solution Approach 1:
The system dynamically selects the appropriate time constant based on operational context. During media replacement events, it uses a shorter second time constant for rapid response, while during normal operation it uses a longer first time constant for precise measurement. This dynamic selection resolves the contradiction by applying the appropriate parameter for each operational state.
Solution Approach 2:
The system periodically evaluates whether a media replacement event is occurring and switches between different measurement approaches accordingly. This periodic assessment allows the system to maintain measurement precision during normal operation while achieving rapid response during media replacement events, resolving the precision-speed trade-off.
Data Source
AI summary
In one aspect, an example method includes (i) determining, by a playback device, a first loudness level of a first portion of first media content from a first source while the playback device presents the first media content, with the first portion having a first length; (ii) switching, by the playback device, from presenting the first media content from the first source to presenting second media content from a second source; (iii) based on the switching, determining, by the playback device, second loudness levels of second portions of the first media content while the playback device presents the second media content, with the second portions having a second length that is shorter than the first length; and (iv) while the playback device presents the second media content, adjusting, by the playback device, a volume of the playback device based on one or more of the second loudness levels.