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Audio improvement for a digital cordless phone Disclosure Number: IPCOM000022071D
Publication Date: 2004-Feb-23
Document File: 1 page(s) / 21K

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Audio improvement for a digital cordless phone

Audio quality is one of the most crucial decision factors that come into play when customers are considering the purchase of a cordless phone. Cordless phones frequently operate in unlicensed RF bands such as, the 2.4 GHz ISM band in the United States of America. However, non radio-devices such as microwave ovens may also operate into these frequency ranges and are known to interfere with cordless phones. This kind of interference causes, bit errors, which are manifested to the user as clicks or mute effects. To reduce the number of perceived bit errors, a Forward Error Correction scheme (FEC) can be applied. However, this increases the number of bits that are to be transmitted by the cordless phone which obviously also increases the power consumption of the cordless phone. By applying the FEC scheme only to the audio data and not to the control data of the cordless phone, an improved audio quality can be obtained whilst at the same time the number of additional transmitted bits can be kept to a minimum. It will be appreciated that this will lead to an optimized power consumption of the cordless phone.

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