Digital frequency synthesizer receiver
First Claim
1. A superheterodyne receive, comprising means for receiving a high frequency signal, local oscillating means for providing an oscillation frequency signal the frequency of which is different by a given frequency difference from said received high frequency signal and mixing means responsive to said received high frequency signal and said local oscillation frequency signal for providing an intermediate frequency signal;
- said local oscillating means comprisingvoltage controlled oscillating means for providing said oscillation frequency signal the oscillation frequency of which is variable as a function of a given control voltage,means for modifying the oscillation frequency of the output from said voltage controlled oscillating means,means for controlling the rate of frequency modification of said oscillation frequency modifying means, andmeans responsive to the output from said oscillation frequency modifying means, as modified at the frequency modification rate controlled by said frequency modification rate controlling means, for providing a control voltage associated with the frequency of the output from said oscillation frequency modifying means to said voltage controlled oscillating means, whereby said local oscillating means is adapted to provide a local oscillation frequency signal the frequency of which is associated with the frequency modification rate, as controlled by said frequency modification rate controlling means, said receiver further comprising,means for inputting information concerning the manner of controlling the frequency modification rate by said frequency modification rate controlling means,means responsive to the information inputted by said inputting means for controlling sequentially the manner of controlling said frequency modification rate by said frequency modification rate controlling means,said sequential control means comprising means for generating timing signals, and means responsive to the information inputted by said inputting means and said timing signals obtainable from said timing signal generating means for providing a sequential control signal in synchronism with said timing signals, said timing signal generating means being adapted to be actuated in response to the information inputted by said inputting means,means responsive to said inputting means for accommodating the control of frequency modification rate by said frequency modification rate controling means for enabling reception of the frequencies in a given receiving frequency range,means for providing a signal representative of the tuning state by said receiver, andmeans for commanding a scanning operation by said receiver,said frequency modification rate controlling means comprising means responsive to said commond output from said scanning operation commanding means to be enabled to make variation of the frequency modification rate in a given direction and responsive to said signal representative of the tuning state by state receiver to be disabled, thereby to discontinue the variation of said frequency modification rate,said accommodating means comprising means for storing information concerning said given receiving frequency range, and means operatively coupled to said information storing means for controlling the variation range of said frequency modification rate variation means with said information concerning said given receiving frequency range.
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Accused Products
Abstract
A scanning type frequency synthesized receiver utilizing a voltage controlled oscillator (VCO) for producing a local oscillator signal. The control voltage for the VCO is provided in response to the division rate of a programmable divider. A control circuit programs the divider which control circuit operates to vary the divisor of the divider within a predetermined range as determined by information stored in a memory corresponding to a range of frequencies in a frequency band to be scanned and received by the receiver. Upon a command signal the control circuit operates to vary the divisor of the divider either up or down to cause the frequency of VCO, and thereby the receiver, to scan in a given direction and upon a signal being received the variation of the divider divisor and the receiver scanning is terminated. The VCO can be scanned either up or down in frequency, and the scanning can be either from the upper (or lower) end of a frequency range back to the lower (or upper) end and then reversed or a repetitive scanning from one end of the range to the other in the same direction. In the preferred embodiment disclosed is a multiband scanning receiver in which the stored information for the control circuit corresponds to the extremities of each of a plurality of frequency bands, the information corresponding to a particular band being utilized in response to selection of the band for reception by a band switching means.
68 Citations
39 Claims
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1. A superheterodyne receive, comprising means for receiving a high frequency signal, local oscillating means for providing an oscillation frequency signal the frequency of which is different by a given frequency difference from said received high frequency signal and mixing means responsive to said received high frequency signal and said local oscillation frequency signal for providing an intermediate frequency signal;
- said local oscillating means comprising
voltage controlled oscillating means for providing said oscillation frequency signal the oscillation frequency of which is variable as a function of a given control voltage, means for modifying the oscillation frequency of the output from said voltage controlled oscillating means, means for controlling the rate of frequency modification of said oscillation frequency modifying means, and means responsive to the output from said oscillation frequency modifying means, as modified at the frequency modification rate controlled by said frequency modification rate controlling means, for providing a control voltage associated with the frequency of the output from said oscillation frequency modifying means to said voltage controlled oscillating means, whereby said local oscillating means is adapted to provide a local oscillation frequency signal the frequency of which is associated with the frequency modification rate, as controlled by said frequency modification rate controlling means, said receiver further comprising, means for inputting information concerning the manner of controlling the frequency modification rate by said frequency modification rate controlling means, means responsive to the information inputted by said inputting means for controlling sequentially the manner of controlling said frequency modification rate by said frequency modification rate controlling means, said sequential control means comprising means for generating timing signals, and means responsive to the information inputted by said inputting means and said timing signals obtainable from said timing signal generating means for providing a sequential control signal in synchronism with said timing signals, said timing signal generating means being adapted to be actuated in response to the information inputted by said inputting means, means responsive to said inputting means for accommodating the control of frequency modification rate by said frequency modification rate controling means for enabling reception of the frequencies in a given receiving frequency range, means for providing a signal representative of the tuning state by said receiver, and means for commanding a scanning operation by said receiver, said frequency modification rate controlling means comprising means responsive to said commond output from said scanning operation commanding means to be enabled to make variation of the frequency modification rate in a given direction and responsive to said signal representative of the tuning state by state receiver to be disabled, thereby to discontinue the variation of said frequency modification rate, said accommodating means comprising means for storing information concerning said given receiving frequency range, and means operatively coupled to said information storing means for controlling the variation range of said frequency modification rate variation means with said information concerning said given receiving frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- said local oscillating means comprising
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19. A superheterodyne receiver, comprising means for receiving a high frequency signal, local oscillating means for providing an oscillation frequency signal the frequency of which is different by a given frequency difference from said received high frequency signal and mixing means responsive to said received high frequency signal and said local oscillation frequency signal for providing an intermediate frequency signal;
- said local oscillating means comprising
voltage controlled oscillating means for providing for oscillation frequency signal the oscillation frequency of which is variable as a function of a given control voltage, means for modifying the oscillation frequency of the output from said voltage controlled oscillating means, means for controlling the rate of frequency modification of said oscillation frequency modifying means, and means responsive to the output from said oscillation frequency modifying means, as modified at the frequency modification rate controlled by said frequency modification rate controlling means, for providing a control voltage associated with the frequency of the output from said oscillation frequency modifying means to said voltage controlled oscillating means, whereby said local oscillating means is adapted to provide a local oscillation frequency signal the frequency of which is associated with the frequency modification rate, as controlled by said frequency modification rate controlling means, said receiver further comprising, means for inputting information concerning the manner of controlling the frequency modification rate by said frequency modification rate controlling means, said inputting means comprising means for selecting a plurality of receiving frequency bands, means responsive to the information inputted by said inputting means for controlling sequentially the manner of controlling said frequency modification rate by said frequency modification rate controlling means, said sequential control means comprising means responsive to the output from said band selecting means for accommodating the control of frequency modification rate by said frequency modification rate controlling means for enabling reception of the frequencies in the corresponding selected receiving frequency band, means for providing a signal representative of the tuning state by said receiver, and means for commanding a scanning operation by said receiver, said frequency modification rate controlling means comprising means responsive to said command output from said scanning operation commanding means to be enabled to make the variation of the frequency modification rate in a given direction and responsive to said signal representative of the tuning state by said receiver to be disabled, thereby to discontinue the variation of said frequency modification rate, said accommodating means comprising means for storing information concerning one extremity frequency of the frequency range of each of said plurality of receiving frequency bands, and means responsive to the band selecting output for controlling the variation range of said frequency modification rate variation means by initially setting said information concerning said one extremity frequency of the frequency range of the corresponding selected receiving frequency band in said frequency modification rate variation means. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
- said local oscillating means comprising
Specification