Dual-SIM Call Recording Audio Separation
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Solution Overview
Problem
Conventional call recording applications for Dual-Subscriber Identity Module (SIM) wireless communication devices cannot record conversations on both subscriptions simultaneously, leading to intertwined audio and loss of recorded conversations when switching between calls.
Innovation Solution
A multi-SIM wireless communication device with a control unit that interrupts the output of one audio signal to a sound reproduction device and directs it to a recording unit, while allowing the other audio signal to be output to the sound reproduction device, enabling separate recording of each call by muting one call when the other is active.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If call recording is enabled on a DSDA wireless communication device, then the audio of the active conversation can be recorded, but the audio from both subscriptions becomes intertwined when the user switches between them, making it difficult to filter the desired conversation
Solution Approach 1:
The patent segments the audio recording process by subscription. When a call on Sub1 is being recorded and the user switches to Sub2, the system separates the audio streams by muting Sub1 and recording only Sub2's audio. This segmentation prevents audio intertwining and ensures each subscription's conversation is recorded separately and clearly.
2Ease of operation
If the user answers a call on Subscription2 while a conference call on Subscription1 is being recorded, then the call on Sub2 can be communicated, but the conference call on Sub1 is put on local hold and not recorded even though it remains active at the radio layer
Solution Approach 1:
The system performs preliminary actions by detecting when the user switches subscriptions before the audio mixing problem occurs. When switching from Sub1 to Sub2, the system proactively mutes Sub1's audio output and directs only Sub2's audio to the speaker and recorder. This preliminary separation prevents the information loss that would otherwise occur during call switching.
3Device complexity
If conventional call recording applications record only the audio of the active conversation, then the recording process is simple, but simultaneous recording of both subscriptions is not possible
Solution Approach 1:
The patent implements dynamic recording behavior that adapts to the user's subscription state. The system automatically adjusts which subscription's audio is recorded based on real-time conditions: if Sub1 is active and being recorded, and the user switches to Sub2, the system dynamically mutes Sub1 and records Sub2 instead. This dynamic adaptation enables versatile multi-subscription recording while maintaining relatively simple system architecture.
Data Source
AI summary
A multi-Subscriber Identity Module (SIM) wireless communication device includes: a first communications unit; a second communications unit; a recording unit; and a control unit configured to cause the first communications unit to interrupt output of a first audio output signal to a sound reproduction device and conduct a first decoded audio signal to the recording unit; and the control unit configured to cause the second communications unit to output a second audio output signal to the sound reproduction device.