Title:
FREQUENCY BAND INVERSION CIRCUIT
Document Type and Number:
Japanese Patent JPS6281889
Kind Code:
A
Abstract:
PURPOSE:To obtain a frequency band inversion circuit without a carrier leakage and the leakage of an input sound signal by applying a D/A conversion and a complementary conversion on the input sound signal after it is band-limited, and performing the inversion operation of a frequency band. CONSTITUTION:By adding a sound signal from an input terminal 101 and, a band exceeding over a sampling frequency is eliminated with an LPF to prevent a reflected distortion. The signal is added to a 90 deg. phase shifter 103 and the signals having a phase difference of 90 deg. are outputted from output terminals 104 and 105. These two signals are added to A/D converters 110 and 111 through sample/hold circuits 107 and 108, and furthermore, to complementary conversion circuits 115 and 116. And by adding the outputs of these two complementary conversion circuits 115 and 116 at an adder 117 and passing it through a D/A converter 118 and an LPF119, the sound signal from which a high pass distortion and a noise are eliminated and the frequency band of which is inverted, can be obtained at an output terminal 120.
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Inventors:
IGATA YUJI
MORI HITOSHI
MORI HITOSHI
Application Number:
JP22221885A
Publication Date:
April 15, 1987
Filing Date:
October 04, 1985
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H04K1/00; H04N7/167; (IPC1-7): H04K1/00; H04N7/167
Attorney, Agent or Firm:
Toshio Nakao
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