Amphony h2500 情報ガイド
Q: What exactly is a RangeBooster transmitter ?
A: A RangeBooster transmitter is a secondary transmitter which can be used to extend the opera-
ting range of the 5.8 GHz Digital wireless headphones. This is useful if you want to listen to your
headphones in areas where the signal may be blocked by walls or other obstacles. Also, the use of
RangeBooster transmitters is recommended in areas where there may be strong interference from
other transmitters, microwave ovens etc. Please do not use a 2.4 GHz RangeBooster since it will
not work with your 5.8 GHz headphones.
ting range of the 5.8 GHz Digital wireless headphones. This is useful if you want to listen to your
headphones in areas where the signal may be blocked by walls or other obstacles. Also, the use of
RangeBooster transmitters is recommended in areas where there may be strong interference from
other transmitters, microwave ovens etc. Please do not use a 2.4 GHz RangeBooster since it will
not work with your 5.8 GHz headphones.
The RangeBooster transmitter can be placed in an area where signal reception from the main
transmitter is not possible or difficult. It is possible to use multiple RangeBooster transmitters. It is
necessary though to have a cable connection, preferably a coaxial cable connection, between the
location of the main transmitter and any RangeBooster transmitter. The audio will be transmitted
from the main transmitter to any RangeBooster transmitter via cable digitally, i.e. without any audio
degradation.
transmitter is not possible or difficult. It is possible to use multiple RangeBooster transmitters. It is
necessary though to have a cable connection, preferably a coaxial cable connection, between the
location of the main transmitter and any RangeBooster transmitter. The audio will be transmitted
from the main transmitter to any RangeBooster transmitter via cable digitally, i.e. without any audio
degradation.
Q: Can these headphones also be used to listen to surround sound ?
A: Yes. In order to experience surround sound via headphones, it is necessary to convert the
surround signal into something called a ‚binaural signal'. There are many binaural processors on the
market which can be connected directly to the transmitter. It is recommended though to test the
binaural processor prior to purchase since the surround perception very much depends on your
hearing and a particular binaural processor may not be suitable for you. You can test the processor
using corded headphones. It is preferable to use processors that provide a digital audio output
which can directly connect to one of the digital transmitter audio interfaces.
surround signal into something called a ‚binaural signal'. There are many binaural processors on the
market which can be connected directly to the transmitter. It is recommended though to test the
binaural processor prior to purchase since the surround perception very much depends on your
hearing and a particular binaural processor may not be suitable for you. You can test the processor
using corded headphones. It is preferable to use processors that provide a digital audio output
which can directly connect to one of the digital transmitter audio interfaces.
Q: What are the benefits of transmitting the full data rate without using audio compression ?
A: Since our transmitter transmits a data rate of over 3 Mbps (3 million bits per second), the audio
can be transmitted without audio compression. Also, forward error correction can be used. The
reason that other systems use audio compression is to reduce the extremely high data rate of a
pure (uncompressed) audio signal in order to either be able to store that signal or transmit that
signal more easily.
can be transmitted without audio compression. Also, forward error correction can be used. The
reason that other systems use audio compression is to reduce the extremely high data rate of a
pure (uncompressed) audio signal in order to either be able to store that signal or transmit that
signal more easily.
The biggest drawback of using audio compression is that the quality of the audio signal is reduced,
such as in MP3-compressed audio. This is because audio compression removes parts of the music.
Some types of music which are particularly difficult to compress without noticing audio degradation.
Systems using audio compression are not able to deliver CD-quality audio.
such as in MP3-compressed audio. This is because audio compression removes parts of the music.
Some types of music which are particularly difficult to compress without noticing audio degradation.
Systems using audio compression are not able to deliver CD-quality audio.
Forward error correction adds additional data to the transmitted signal so that in cases where the
data may be corrupted during transmission, the original data can be recovered at the receiver. This
ensures a very robust transmission.
data may be corrupted during transmission, the original data can be recovered at the receiver. This
ensures a very robust transmission.
Q: Do I need line of sight between the transmitter and headphones ?
A: Line of sight between the transmitter and headphones is not necessary for the headphones to
operate. However, for maximum range and reliability, we recommend that the transmitter be placed
such that the number of walls of obstacles between the transmitter and listening area is reduced to
a minimum.
operate. However, for maximum range and reliability, we recommend that the transmitter be placed
such that the number of walls of obstacles between the transmitter and listening area is reduced to
a minimum.
© 2004 Amphony 4