| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wireless communication unit that can easily be set to a characteristic in matching with an audio frequency characteristic that is a requirement of each delivered place. SOLUTION: A digital signal processor 15 configures a transmitter side filter that consists of digital filters 3, 5, 7 and 11, receives an A/D conversion audio signal, sets an AF bandwidth, pre-emphasizes the signal and gives the result to a modulation stage and a receiver side filter that consists of digital filters 27, 29 and 31, receives an A/D conversion detection output signal, sets the AF bandwidth and de-emphasizes the signal and provides an output. At application of power, a delivery place code with respect to a designated delivery place is written in a delivery place code storage area, a head address of delivery place filter coefficient storage areas on the basis of the delivery place code written in the delivery place code storage area is stored in a filter coefficient address storage area, and a filter coefficient read from the delivery place filter coefficient storage area whose head address is stored in the filter coefficient address storage area is set to the transmitter side filter and the receiver side filter.</p> |
