Is playing a recorded Adhan at home to accustom children to prayer considered a bid‘ah (innovation), knowing that it is not heard in the streets and does not take the place of the শরعي Adhan?

Setting an alarm that plays the Adhan (call to prayer) at the beginning of the prayer time is a good thing; it reminds one of the prayer and helps in maintaining it, and it is not considered an innovation (bid'ah). If the mosque is far away, one can pray in congregation at work or at home to earn the reward of communal prayer.