| 摘要 |
The present invention provides an audio blending device of an FM bandwidth DAB system wherein signal interruption is mitigated and sound loss is reduced in digital audio broadcasting. The audio blending device of an FM bandwidth DAB system comprises: a first signal delay detecting circuit for detecting a first signal delay between a main broadcasting signal, which is input within an initially configured time, and a spare broadcasting signal, and applying the first signal delay to the spare broadcasting signal; a signal delay monitoring circuit for determining whether or not a second signal delay, which is caused by the packer error of the main broadcasting signal input from the first signal delay detecting circuit, occurs; a second signal delay detecting circuit for detecting a second signal delay caused by a packet error occurring during broadcasting according to the determination result of the signal delay detecting circuit and determining the delay type of the second signal delay; a signal delay determining circuit for applying the second signal delay to any one among the main broadcasting signal and the spare broadcasting signal depending on the second signal delay and the delay type of the second signal delay detecting circuit or configuring a current frame to be in a signal interruption state; a voice motion detecting circuit for outputting a voice motion coefficient to be able to detect the signal interruption interval of the main broadcasting signal depending on the signal interruption state configured for the signal delay determining circuit; and a voice blending circuit for blending the main broadcasting signal and the spare broadcasting signal depending on the voice motion coefficient output from the voice motion detecting circuit. |
