Frequency converting apparatus
First Claim
Patent Images
1. Apparatus for frequency-converting a signal from a lower frequency band into a higher frequency band, comprising:
- means for receiving the signal to be subjected to frequency conversion;
means for sample-holding the received signal by using a sample-hold signal, a sample period and hold interval of the sample-hold signal being determined so that the top of a selected lobe in the spectrum of the sample-hold signal corresponds to the higher frequency band; and
a bandpass filter for extracting frequency components at the higher frequency band from the sample-held received signal to produce the signal at the higher frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
A frequency converting apparatus including a sample circuit and a bandpass filter wherein an input analog signal is sampled at predetermined periods only for predetermined time intervals to produce or increase the harmonic components of the original analog signal, a desired frequency component is extracted through the bandpass filter from the harmonic components to thereby convert the original signal having a particular frequency band to a signal having a higher-frequency band.
-
Citations
4 Claims
-
1. Apparatus for frequency-converting a signal from a lower frequency band into a higher frequency band, comprising:
-
means for receiving the signal to be subjected to frequency conversion; means for sample-holding the received signal by using a sample-hold signal, a sample period and hold interval of the sample-hold signal being determined so that the top of a selected lobe in the spectrum of the sample-hold signal corresponds to the higher frequency band; and a bandpass filter for extracting frequency components at the higher frequency band from the sample-held received signal to produce the signal at the higher frequency band. - View Dependent Claims (2, 3)
-
-
4. A digital modulated comprising:
-
an A/D converter for converting an analog baseband signal into a digital baseband signal; a processor responsive to the digital baseband signal for producing a modulated digital signal; a D/A converter for converting the modulated digital signal into a modulated analog signal; means for sample-holding the modulated analog signal by using a sample-hold signal, a sample period and hold interval of the sample-hold signal being determined so that the top of a selected lobe in the spectrum of the sample-hold signal corresponds to a modulation carrier frequency; and a bandpass filter for extracting frequency components from the sample-held modulated analog signal, the center frequency of the bandpass filter corresponding to the modulation carrier frequency.
-
Specification