Bifunctional Turntable Dual-Record Playback
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Solution Overview
Problem
Conventional turntables for DJs are limited to playing simulated records and are inconvenient due to high cost, complex dual-axis design, and frequent assembly/disassembly issues, which lead to wear and decreased sensing accuracy, while they cannot play vinyl records and require a vast record collection.
Innovation Solution
A bifunctional turntable with a rotating shaft, platter, light sensor module, and audio control module mounted in a plinth, allowing the turntable to play both vinyl and simulated records by detecting rotation speed and sending control signals to a digital audio system, using a magnetic transducer and Hall element sensor for seamless operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual-axis design is used for DJ turntables, then the ability to play simulated records with audio effects is improved, but the device complexity increases and assembly/disassembly frequency causes wear and sensing accuracy degradation
Solution Approach 1:
The patent extracts the sensing function from the tonearm and relocates it to the rotating shaft. The speed sensor is now fixed to the rotating shaft to directly detect rotation speed, eliminating the need for the complex dual-axis mechanism while maintaining the ability to detect playback speed for audio effects.
Solution Approach 2:
The rotating shaft serves multiple functions: it drives the platter rotation for vinyl record playback and simultaneously acts as the mounting base for the speed sensor. This multi-functional design eliminates the need for separate dual-axis structures while maintaining sensing capability.
2Measurement precision
If a dual-axis design with separate sensed member and shaft assembly is used, then the sensing function is improved, but the ease of operation deteriorates due to frequent assembly and disassembly
Solution Approach 1:
The patent merges the sensed member (speed sensor) and the shaft into a single integrated assembly where the speed sensor is directly fixed to the rotating shaft. This eliminates the need for separate assembly and disassembly of multiple components, reducing wear and improving ease of operation while maintaining sensing accuracy.
3Measurement precision
If a tonearm is used as the base frame for fixing the speed sensor, then the sensing function is achieved, but the ability to play vinyl records is lost
Solution Approach 1:
The patent extracts the speed sensor mounting function from the tonearm and relocates it to the rotating shaft. This allows the tonearm to be dedicated solely to vinyl record playback while the rotating shaft handles speed sensing for both vinyl and simulated records.
Solution Approach 2:
The rotating shaft acts as an intermediary structure that connects the platter drive mechanism with the speed sensing function. By fixing the speed sensor to the rotating shaft rather than the tonearm, the system can detect rotation speed without interfering with vinyl record playback capability.
4Reliability
If conventional vinyl records are used for DJ scratching, then the audio quality is maintained, but the loss of substance increases due to easy damage and the volume required for record collection increases
Solution Approach 1:
The patent uses simulated records (digital copies) that replicate the appearance and scratching interface of conventional vinyl records but contain no physical grooves. These simulated records are played back through software that generates audio effects, eliminating physical wear and damage while maintaining the DJ scratching experience.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The bifunctional turntable provides a cost-effective and convenient solution for playing both vinyl and simulated records, enhancing usability and maintaining accurate sensing with reduced wear, enabling a fun and lively atmosphere for DJ performances.
Implementation Method 1
a light sensor module (4), arranged on the rotating shaft (2) for detecting rotation speed of the platter (3)
Implementation Method 2
The transducer is a magnetic transducer and the sensor is a Hall element
Data Source
AI summary
A bifunctional turntable which includes a rotating shaft, a platter, a light sensor module, an audio control module, and a plinth is revealed. The rotating shaft which is driven by a power source to rotate drives the platter to rotate. Then the light sensor module disposed on the rotating shaft detects rotation speed of the platter for playing a record at normal speed. The audio control module is located in the plinth and disposed on a simulated record for detecting changes in the simulated record which is manually operated. Then the audio control module sends signals to a digital audio control system at a rear end for driving the digital audio control system to output audio signals. Thereby the present turntable plays not only vinyl records but also simulated records.