Digital demodulating apparatus and controlling method thereof
A technology of digital demodulation and receiving unit, applied in the field of digital demodulation device, can solve the problem of inability to control power supply, and achieve the effect of reducing the power supply and suppressing power consumption
Inactive Publication Date: 2008-06-11
SHARP KK
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Therefore, in a configuration in which the supplied power is changed immediately after the reception condition changes, the power supply cannot be properly controlled according to the reception condition
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[0022] Preferred embodiments of the present invention will be described below. Figure 1A An external view of the cellular phone 1000 according to the first embodiment of the present invention is shown. Figure 1B A rough configuration of the digital demodulation device 1 included in the cellular phone 1000 is shown.
[0023] The digital demodulation device 1 is included in the cellular phone 1000 of this embodiment. The digital demodulation device 1 demodulates the signal Sr received by the cellular phone 1000 through its antenna. From the demodulated signal output from the digital demodulation device 1, information on data of characters, images, sounds, or programs is extracted, and the data is reproduced. These characters, images, etc. are provided to the user of the cellular phone 1000 through an unillustrated display and an unillustrated speaker provided on the telephone 1000 . In addition, the digital demodulation device 1 can be adopted in other digital receivers than...
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A digital demodulating apparatus includes a supplying unit that supplies power to each of circuit elements constituting a receiving unit that receives a signal, and a demodulating unit that demodulates the received signal. The apparatus further includes a correcting unit that corrects errors due to noises generated on a transmission path of the received signal; a calculating unit that calculates a value indicating the quantity of noises contained in the signal when the correcting unit corrects the errors; a judging unit that judges whether or not reception conditions of the received signal are good in a predetermined time period, based on values calculated by the calculating unit; and a reducing unit that reduces the power to be supplied to each circuit element by the supplying unit, when the judging unit decides that the reception conditions are good. The judging unit judges the reception conditions based on values repeatedly calculated by the calculating unit in the predetermined time period after a value calculated by the calculating unit indicates that the noises have become not more than a predetermined reference quantity.
Description
technical field [0001] The present invention relates to a digital demodulation device and a control method of the device. Background technique [0002] In a device that receives a modulated signal and demodulates it, it must be ensured that each circuit element is supplied with a certain level of power to obtain a correctly demodulated signal. The strength of the necessary power supply varies according to the signal reception conditions. For example, in circuit elements, it is necessary to increase the supply power when the reception condition is poor. However, under good reception conditions, the supply power does not need to be increased that much. Therefore, in order to reduce power consumption, it is conceivable to control the power supplied to each circuit element according to the reception status of a signal. [0003] An apparatus disclosed in Japanese Unexamined Patent Laid-Open No. 2005-33671 receives a television broadcast and demodulates a signal of the broadcas...
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IPC IPC(8): H04L27/00H04H40/45H04H1/00
CPCG10L19/005Y02B60/50H04W52/0245Y02D30/70
Inventor 海木延佳坂井孝江
Owner SHARP KK