Which of the following processes can a transcoder perform?
A.
conversion of analog audio to digital audio
B.
conversion of digital audio to analog audio
C.
conversion of digital audio from one codec to another
D.
sampling, encoding, and compression of analog audio
Explanation:
A transcoder can convert digital audio from one codec to another. Transcoders enable communication between
devices that support dissimilar audio codecs. For example, a transcoder can translate a G.729-encoded packet
to a G.711encoded packet and vice versa. Transcoders translate the data stream in real time between two
devices so that no audio delay is experienced by either endpoint.
A digital signal processor (DSP), not a transcoder, can convert analog audio to digital audio and convert digital
audio to analog audio. When analog audio is received by a DSP, the DSP samples and quantizes the analog
audio data, encodes the data into binary format, and optionally, compresses it to conserve bandwidth. For
example, Cisco Integrated Services Routers (ISRs) with DSP resources are used to process calls between
Cisco Unified Communications Manager (UCM) and the public switched telephone network (PSTN).Cisco: Transcoders: Understanding Transcoders