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In a leap towards a more harmonious customer service landscape, technology giant, SoftBank, has developed an advanced AI voice-altering technology designed to convert angry voices of customers into calm ones. By ushering in this innovative intervention, SoftBank sets out to uplift the work environment for call centre operators, potentially reshaping their stress-infused experiences considerably.

SoftBank's technology stems from the ingenious idea of an employee, Toshiyuki Nakatani, who had been inspired by a television program addressing customer harassment. The technology centres around not altering the content or semantics of what the irate customer says, but rather tuning down the pitch and inflection of their voice to reduce the conversational tension. This new development aims to alleviate the job pressures associated with receiving constant complaints and anger from dissatisfied customers.

The AI backing the voice-altering technology had been trained on a massive dataset - over 10,000 pieces of voice data, generously provided by actors who performed different phrases with varying emotional authenticity. Each spoken set helped the AI's learning engine decipher and distinguish between various emotional indicators expressed through voice - an element instrumental in the tech’s success.

To maintain the necessary balance for operators to still discern if a customer is upset, the technology has been programmed to leave a slight trace of perceptible anger in the voice. This nuanced setting allows operators to still gauge customers' dissatisfaction levels, aiding in the productive resolution of their complaints.

In addition to soothing disgruntled voices, the AI is equipped to deal with extremely abusive or lengthy conversations. When such cases arise, the AI can issue a warning message to the customer, highlighting possible termination of service. This feature serves to protect call center operators against potential harm or harassment.

While SoftBank vouches for the efficacy of AI in managing customer complaints, the company continues to stress the critical role of humans in discerning and interpreting emotions - elements often too complex and vague for AI to fully grasp. As such, this nod to the inherent value of human interaction suggests the technology is not designed to overtake human call centre operators but, instead, equip them with a valuable tool to manage their work more meaningfully and less stressfully.

Aligning with the societal shift towards enhancing AI's capabilities, SoftBank is determined to keep refining its innovative tool by having the AI continually learn from more voice data. The company targets to commence selling this voice-altering technology from fiscal 2025.

As we stand on the outskirts of possibilities for AI in everyday conversations, SoftBank's new technology may be a trailblazer, leading us to a future where automatic voice modulation can be a common tool, not just for call centres but in virtually any conversational setting. With immediate implications for reducing stress in the workplace and the potential for wider use in the future, this technology signals a significant shift in managing tensions in verbal interactions.

This development not only enlightens us on the strides AI is making into understanding and simulating human emotion but also prompts wider discussions about AI's role in safeguarding human mental wellbeing in high-stress professional settings. It's this momentous convergence of technology, empathy, and conversation that marks a promising step into the future.