Broadcast Audio Receiver Feedback Channel for Power and AFH Control

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Solution Overview

Problem

Bluetooth broadcast audio systems suffer from poor audio quality and increased power consumption due to arbitrary power level selection and sub-optimal channel selection, which affects receivers at varying distances from the broadcaster, leading to reception failures and battery drain.

Innovation Solution

Implementing feedback logic circuitry that includes a feedback channel for receivers to provide reception metrics, allowing the broadcaster to adjust power levels and AFH channel maps based on collected feedback, such as RSSI and PER, to optimize audio transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the Broadcaster uses high power level for audio transmission, then receivers further away can receive audio, but receivers very close to the Broadcaster experience LNA saturation and reception failures

Engineering Contradiction:

Improvereception reliabilityVSAvoidLNA saturation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic power level adjustment where the Broadcaster transitions from using a fixed arbitrary power level to dynamically adapting power levels based on feedback received from synchronized receivers. The feedback channel enables receivers to report reception quality metrics, and the Broadcaster adjusts transmission power accordingly - using lower power for nearby receivers and higher power for distant receivers, thereby preventing LNA saturation while maintaining reception reliability.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the Broadcaster uses arbitrary power level, then transmission is simple, but user experience deteriorates due to poor audio quality and increased power consumption

Engineering Contradiction:

Improvetransmission simplicityVSAvoidaudio quality

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces a feedback channel that enables synchronized receivers to send reception quality feedback (including RSSI, PER, and other metrics) back to the Broadcaster. This feedback mechanism transforms the previously open-loop arbitrary power level selection into a closed-loop adaptive system, where the Broadcaster can optimize transmission parameters based on actual reception conditions, thereby improving audio quality while maintaining operational simplicity through automated adjustment.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent implements parameter changes by dynamically adjusting transmission power levels and AFH channel maps based on feedback from receivers. Instead of using fixed arbitrary parameters, the system modifies transmission parameters (power level, channel selection) according to measured reception conditions, optimizing audio quality and power consumption through adaptive parameter tuning.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the Broadcaster selects AFH channel map based on its position alone, then channel selection is simple, but receivers at different positions experience audio fades and glitches

Engineering Contradiction:

Improvechannel selection simplicityVSAvoidaudio continuity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent extends the feedback mechanism to include AFH channel map optimization. Synchronized receivers report channel quality metrics and reception conditions back to the Broadcaster, which then adjusts the AFH channel map accordingly. This enables the system to select optimal RF channels based on actual reception conditions at different positions, preventing audio fades and glitches while maintaining simple automated channel management.

Inventive Principle:

Principle #23Feedback

4Reliability

If receivers stay awake to receive unconditional retries, then reception reliability improves, but battery consumption increases

Engineering Contradiction:

Improvereception reliabilityVSAvoidbattery consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements adaptive retransmission parameters based on feedback from receivers. Instead of using fixed unconditional retries that keep receivers awake and consuming battery, the system adjusts retransmission timing and parameters according to actual reception conditions reported by receivers. This enables more efficient power management where receivers can enter sleep mode more aggressively when conditions are good, while still maintaining reception reliability through targeted retransmissions when needed.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12445777B2Methods and arrangements for a broadcast audio receiver feedback channel

Publication Date: 2025.10.14 INTEL CORP

AI summary

Logic to cause transmission of an audio protocol data unit (PDU) during each of the one or more subevents. Logic to generate a feedback request frame as a feedback request PDU. Logic to cause transmission of the feedback request PDU on a feedback channel. Logic to scan the feedback channel for one or more feedback response PDUs transmitted in response to transmission of the feedback request PDU. Logic to modify the one or more parameters of transmission of the audio PDUs in a subsequent broadcast isochronous group (BIG) event based on the one or more feedback response PDUs. Logic to receive of an audio PDU during each of the one or more subevents. Logic to receive the feedback request PDU on a feedback channel. Logic to generate a feedback response PDU in response. And logic to cause transmission of the feedback response PDU on the feedback channel.