Audible errors detection and prevention for speech decoding, audible errors concealing
AssigneeAudax Radio Systems LLP
InventorGraham Kinns
Life of this patent
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Abstract
A method and apparatus of providing an audio output to a user in a communications system in which the audio to be output to a user, preferably an audio frame, is assessed before it is broadcast to the user, and then selectively changed on the basis of the assessment. The assessment may be carried out in the audio encoding process, in the audio decoding process and/or after the audio decoding process. The selective changing of the audio output may comprise selectively replacing the audio output and/or re-encoding of the audio output.
Claims10
A method of providing audio output from a Terrestrial Trunked Radio (TETRA) speech decoder to a user in a TETRA communications system, the method comprising:
- assessing only a portion of a decoded audio output frame emitted by the TETRA speech decoder before it is broadcast to the user by taking Pulse Code Modulation (PCM) samples of said portion of said decoded audio output frame and comparing a measure of the quality and/or the sampled parameter or parameter values of the decoded audio frame portion with one or more predetermined threshold and/or reference measures and/or parameter value or values to determine whether or not it is acceptable;
- and
- replacing the entire audio output frame that is broadcast to the user when said assessed portion is determined to be unacceptable.
An apparatus for providing audio output from a Terrestrial Trunked Radio (TETRA) speech decoder to a user in a TETRA communications system, the apparatus comprising:
- means for assessing only a portion of a decoded audio output frame from the TETRA speech decoder before it is broadcast to the user by taking Pulse Code Modulation (PCM) samples of said portion of said decoded audio output frame and comparing a measure of the quality and/or the sampled parameter or parameter values of the decoded audio frame portion with one or more predetermined threshold and/or reference measures and/or parameter value or values to determine whether or not it is acceptable;
- and
- means for replacing the entire audio output frame that is broadcast to the user when said assessed portion is determined to be unacceptable.
Dependencies are inferred from the claim text.