Mobile communicator and method for deciding speech coding rate in mobile communicator
First Claim
1. A mobile communicator that encodes an inputted speech signal, amplifies the encoded speech signal and transmits the amplified encoded speech signal, comprising:
- an encoder that encodes an inputted speech signal at one of a plurality of different speech encoding rates;
a speech encoding rate selector that allows a user of the mobile communicator to select one of said plurality of different encoding rates as an upper limit speech encoding rate; and
a speech encoding rate controller that determines a speech encoding rate used by said encoder to encode said inputted speech signal, wherein the determined speech encoding rate is less than or equal to the upper limit speech encoding rate selected by said user.
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Abstract
This invention relates to a mobile communicator which is arranged to save power by efficiently controlling a power amplifier by selecting an adequate speech coding rate. An inventive mobile communicator comprises a plurality of encoding means for encoding a speech signal with different encoding rates, respectively; encoding rate inputting means for accepting an input of encoding rate selected by a terminal user; and encoding rate deciding means for deciding an encoding rate applied for encoding the speech signal based on the encoding rate inputted via the encoding rate inputting means and for selectively switching the plurality of encoding means corresponding to this encoding rate.
37 Citations
9 Claims
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1. A mobile communicator that encodes an inputted speech signal, amplifies the encoded speech signal and transmits the amplified encoded speech signal, comprising:
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an encoder that encodes an inputted speech signal at one of a plurality of different speech encoding rates;
a speech encoding rate selector that allows a user of the mobile communicator to select one of said plurality of different encoding rates as an upper limit speech encoding rate; and
a speech encoding rate controller that determines a speech encoding rate used by said encoder to encode said inputted speech signal, wherein the determined speech encoding rate is less than or equal to the upper limit speech encoding rate selected by said user. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining a speech encoding rate of a mobile communicator, comprising the steps of:
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receiving a selected speech encoding rate as inputted to said mobile communicator by a user of said mobile communicator as an upper limit speech encoding rate; and
determining a speech encoding rate to be used by a process for encoding a speech signal inputted to said mobile communicator such that the determined speech encoding rate is less than or equal to the received selected speech encoding rate. - View Dependent Claims (7, 8)
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9. A method for determining a speech encoding rate of a mobile communicator, comprising the steps of:
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receiving a speech encoding rate corresponding to residual power of a battery power supply of said mobile communicator;
receiving a speech encoding rate from a control signal from a mobile communication network;
receiving a speech encoding rate computed from an inputted speech signal;
determining whether a selected speech encoding rate has been inputted to said mobile communicator by a user of said mobile communicator as a maximum speech encoding rate;
if a selected speech encoding rate has been inputted by a user, setting the selected inputted encoding rate as a first comparison encoding rate;
if a selected speech encoding rate has not been inputted by a user, setting the speech encoding rate corresponding to residual power as said first comparison encoding rate;
comparing said speech encoding rate from said control signal with said speech encoding rate computed from said inputted speech signal and selecting the lower of said speech encoding rates as a second comparison encoding rate; and
comparing said first comparison encoding rate with said second comparison encoding rate and selecting the lower of said comparison encoding rates as a speech encoding rate for encoding said inputted speech signal.
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Specification