Relaying Device Audio Buffering for Channel Reservation
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Solution Overview
Problem
Existing relaying devices often clip off the beginning of verbal communication audio signals due to the time required to reserve a wireless communication channel, leading to incomplete transmission of audio signals to the transceiver.
Innovation Solution
The relaying device buffers audio signals received from the uplink interface until the repeater reserves a channel, ensuring that the beginning of the audio signal is not clipped off during channel reservation, and transfers the buffered audio signal once a channel is reserved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the repeater reserves a channel before transmitting the audio signal, then the channel reservation is ensured, but the beginning of the audio signal is clipped off due to the time required for channel reservation
Solution Approach 1:
The relaying device performs preliminary actions by requesting channel reservation before the audio signal transmission begins. The control unit sends a channel reservation request to the repeater in advance, allowing the channel to be prepared and ready before the actual audio signal needs to be transmitted, thus avoiding signal clipping.
Solution Approach 2:
The relaying device acts as an intermediary between the audio signal source and the repeater. It receives the audio signal, manages the channel reservation process, and coordinates the timing between channel availability and signal transmission, ensuring that the channel is ready before the signal arrives.
2Speed
If the audio signal is sent simultaneously with the VOX-ON signal, then the transmission speed is improved, but the beginning of the audio signal is discarded due to channel reservation time
Solution Approach 1:
The system performs preliminary channel reservation before audio signal transmission begins. The control unit requests channel reservation in advance, so when the audio signal becomes ready for transmission, the channel is already prepared and waiting, eliminating the delay that would cause signal loss.
Solution Approach 2:
The channel reservation process is initiated continuously as part of the call setup, ensuring that the channel is reserved and ready before the audio signal transmission begins. This continuous preparation eliminates gaps or interruptions in the transmission process.
Data Source
Figure 1
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Figure 4A~4C
AI summary
A relaying device is provided, which can mediate communication between a telephone set and a transceiver without clipping off the beginning of verbal communication. The relaying device includes: an uplink interface that continuously receives an audio signal in communication; a wireless apparatus interface to which a repeater acting as a wireless relaying apparatus is connected; a voice buffer that buffers the audio signal; and a control unit. The control unit performs a VOX processing of detecting whether or not a level of the audio signal is equal to or higher than a preset threshold. When the level of the audio signal is equal to or higher than the threshold, the control unit starts buffering the audio signal in the voice buffer, and requests the repeater to reserve a channel. After receiving, from the repeater, a reply indicating that a channel has been reserved, the control unit reads the buffered audio signal from the voice buffer, and transfers this audio signal to the repeater.