There are fundamental differences between Apple and Android in how they handle recording through the charging ports. Basically, iOS includes audio support; Android does not. Google farmed audio support out to the device manufacturers, resulting in much confusion about which devices are compatible and which are not.
Many audio manufacturers, consciously or unconsciously, connect balanced shields to audio signal ground; pin 1 for 3-pin (XLR-type) connectors, the sleeve on 1/4" (6.35mm) jacks. Any currents induced into the shield modulate the ground where the shield is terminated. This also modulates the signal referenced to that ground. Normally great pains are taken by circuit designers to ensure "clean and quiet" audio signal grounds. It is surprising that the practice of draining noisy shield currents to audio signal ground is so widespread. Amazingly enough, acceptable performance in some systems is achievable, further providing confidence for the manufacturer to continue this improper practice -- unfortunately for the unwitting user. The hum and buzz problems inherent in balanced systems with signal-grounded shields has given balanced equipment a bad reputation. This has created great confusion and apprehension among users, system designers as well as equipment designers.
Audio jacks evolution to confusion
Sadly, the possibility of including connector type in a recommended practices document is slim. The duplicate connectors on many audio components contributes to higher costs and wastes millions of dollars worth of connectors that are never used. Some manufacturers are attempting to eliminate the 1/4" connector to avoid the confusion and problems when 1/4" jacks are used. This is a step in the right direction, though the high density allowed by these connectors requires less valuable rear-panel real estate. Most marketing departments prefer thirty connectors per inch, making the currently available 3-pin (XLR) alternative markedly unpopular. What is needed is a 3-pin connector solution that requires less space than the traditional XLR connector. A locking, stackable 3-pin mini-DIN comes to mind. 2ff7e9595c
תגובות