| 摘要 |
<p>At a method for providing predefined audio signals in response to a detected condition, said audio signals stored in a memory [10], said apparatus comprising a microcontroller [12] and audio output means, said memory [10] comprising said audio signals stored in digital form, and said microcontroller [12] comprising a processor and on-chip peripheral [26] it is intended to receive at said processor detector signals indicating a changed condition, to select from said memory [10] an appropriate audio signal associated with said changed condition, to retrieve a delta modulation of said audio signal from said memory [10], to set a duty cycle for a pulse width modulator by a time unit [30], said modulator [28] and time unit [30] being integral on said on-chip peripheral [26], to modulate said audio signal by said modulator [28] so as to produce a digital representation of said audio signal, to transmit said digital representation to a buffer [34] integrated on said on-chip peripheral [26], and to transmit said digital representation to said audio output means for analog reproduction [24] of said audio signal.</p> |
