There are many great inventions like cell phone, internet, satellite, TV etc. I also know one company that takes part in improving and inventing new devices. I read that Beta Solutions once partnered with Atkinson & Rapley Consulting Ltd. They were wrking on designing a dual-channel, broad-spectrum, USB sound recording device for recording environmental sound, specifically for investigating industrial noise pollution. The device simultaneously captures the indoor and outdoor acoustic environments. Houses can greatly change the sound character, so recording both is essential.