Multi-Tuner Receiver Frequency Interference Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In electronic devices with multiple tuner units, there is a risk of local oscillation frequency interference between nearby tuner units, which can degrade reception performance due to their miniaturization and close physical arrangement.

Innovation Solution

A receiving device with multiple receiving circuits and local oscillation circuits, controlled by a unit that selects appropriate search algorithms to find reception frequencies that do not interfere with other circuits, ensuring non-interfering signal selection for each tuner unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If multiple tuner units are arranged physically close to each other for miniaturization, then device size is reduced, but local oscillation frequency interference occurs between tuner units

Engineering Contradiction:

Improvedevice sizeVSAvoidlocal oscillation frequency interference

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The control unit performs preliminary frequency coordination before the tuners operate. It determines the frequency of the first local oscillation circuit and uses this information to select an appropriate search algorithm for the second tuner that avoids the interfering frequency, preventing interference before it occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the search parameters of the second tuner based on the frequency parameters of the first tuner. By selecting different search algorithms or modifying search frequency ranges, the system adjusts the operational parameters of the second tuner to avoid the local oscillation frequency of the first tuner, resolving the interference issue

Inventive Principle:

Principle #35Parameter changes

2Productivity

If multiple receiving circuits operate simultaneously, then multiple channels can be received at the same time, but interfering waves are generated due to local oscillation frequency coincidence

Engineering Contradiction:

Improvesimultaneous channel reception capabilityVSAvoidinterfering waves

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The control unit uses feedback from the first local oscillation circuit's frequency to adjust the second tuner's search parameters. The system continuously monitors the frequency state of operating tuners and uses this feedback to coordinate the search and operation of other tuners, preventing interfering wave generation while maintaining simultaneous multi-channel reception

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP2975772B1Receiver and electronic appliance

Publication Date: 2018.03.07 SONY GROUP CORP

Figure 1
Figure 2
Figure 3~4

AI summary

A receiving device includes a plurality of receiving circuits, a plurality of local oscillation circuits that supply local oscillation signals to each of the plurality of receiving circuits, and a control unit that controls each receiving circuit and each local oscillation circuit. The control unit provides a plurality of search algorithms for searching for a reception frequency in each of the receiving circuits, and selects a search algorithm at the time of searching for the reception frequency of each receiving circuit according to a frequency which is handled by other receiving circuit or other local oscillation circuit.