Patent
Channel selecting apparatus for simultaneous use with both phase-continuous modulation signals and digital modulation signals
Hiroshi Saka,Kazunao Urata +1 more
TLDR
In this article, the frequency of the digitally modulated IF signal can be controlled in accordance with the frequency shift information related to an IF signal having a continuous phase and a digital modulation signal having discontinuous phase.Abstract:
A channel selecting apparatus simultaneously selects both the modulation signals, which are simultaneously received at different channels where modulation signals having a continuous phase and digital modulation signals having a discontinuous phase are located. As both the modulation signals are propagated on the same transmission path or approximately the same inclination of transmission path, modulation signals existing on different channel frequencies suffer approximately similar frequency shift from the transmission path before being inputted to the channel selecting apparatus. Therefore, the frequency of the digitally modulated IF signal can be controlled in accordance with the frequency shift information related to an IF signal having a continuous phase and the frequency of the digitally modulated IF signal may be focused into the comparatively narrow frequency range around the synchronous pull-in frequency of the digital demodulating circuit and the modulation signal having a continuous phase may be focused into the comparatively narrow frequency range around the optimum input frequency of the demodulation circuit.read more
Citations
More filters
Patent
Transmodulated broadcast delivery system for use in multiple dwelling units
TL;DR: In this paper, a system for redistributing a broadband audio-visual-data signal to a multiplicity of receiver units within a multiple dwelling unit (MDU) includes a main receiving antenna that receives a broadband video/audio/data signal having a number of individual program multiplex signals therein and a transmodulator device that transmodulates the individual programmultiplex signals associated with the broadband signal from a first modulation scheme to a second modulation scheme.
Patent
Transmodulator with dynamically selectable channels
TL;DR: In this paper, a system for redistributing a broadband audio-visual-data signal to a multiplicity of receiver units within a multiple dwelling unit (MDU) includes a main receiving antenna that receives a broadband video/audio/data signal having a number of individual program multiplex signals therein and a transmodulator device that transmodulates a selected subset of the individual programmultiplex signals associated with the broadband signal from a first modulation scheme to a second modulation scheme.
Patent
System for and method of combining signals of combining signals of diverse modulation formats for distribution in multiple dwelling units
TL;DR: In this article, a system for distributing first and second television signals of diverse modulation formats to a number of locations in a multiple-dwelling unit is described, where a combiner or diplexer combines the first-and second-transmodulated signals into a combined signal and a distributing network distributes the combined signal to each of a plurality of locations.
Patent
Technique for simultaneous communications of analog frequency-modulated and digitally modulated signals using precanceling scheme
TL;DR: In this article, an extended Kalman filter is employed in the digital receiver to estimate the analog FM signal based on a recovered FM signal from the FM receiver, and a discrete version of the composite signal whose spectrum has been translated and is at an intermediate carrier frequency.
Patent
Method and apparatus for downconverting signals transmitted using a plurality of modulation formats to a common intermediate frequency range
TL;DR: In this paper, a receiver that downconverts input signals modulated using first, second, third, fourth and fourth modulation formats to a common intermediate frequency range is presented. But the input signals are provided to the first and second modulation formats are transmitted to the receiver in a first frequency range, and the third modulation format is transmitted to a recdeiver in a third frequency range.
References
More filters
Patent
Automatic frequency control circuit
TL;DR: In this paper, the frequency of the reproduced carrier is frequency-divided by a frequency dividing circuit and a frequency division output thereof is counted by a counter for a definite period.
Patent
Dual mode automatic frequency control
TL;DR: In this paper, a frequency control system (126) for locking the frequency of a receiver, defined as a receiver portion of a transceiver, to the frequencies of a transmitter, such as a base station is presented.
Patent
Dual-mode AFC circuit for an SSB radio transceiver
TL;DR: In this article, an automatic frequency control (AFC) circuit is proposed for an SSB radio transceiver having the capability of transmitting and receiving SSB and FM data signals over any one of a number of communication channels having equal bandwidths.
Patent
Synchronous demodulator for multi-phase PSK signal
TL;DR: In this article, an N-phase PSK demodulator with a phase-locked loop and a divide-by-two frequency divider is described, where all circuits therein operate in a frequency band equal to or below the carrier band.