Phase shifting apparatus and method with frequency multiplication

An apparatus for shifting a phase of an input signal, said input signal having a bandwidth range greater than one octave, said apparatus including means for generating at least a first selected repetitive offset signal and a second selected repetitive offset signal having a selected frequency and phase relationship,

• a predetermined phase shift being determined by a phase difference of said first and second selected repetitive offset signals, said predetermined phase shift being substantially 90.degree.,
• and means for converting the phase of said input signal in response to said first and second selected repetitive offset signals so as to provide at least a first output signal, said first and second selected repetitive offset signals coupled to said converting means,
• said first output signal having a frequency the same as that of said input signal, said first output signal having a known phase shift with respect to said input signal,
• said converting means comprising
• first multiplier means for multiplying said input signal and said first offset signal to provide at least a first intermediate signal,
• first filter means for filtering said intermediate signal and outputting a filtered intermediate signal,
• second multiplier means for multiplying said filtered intermediate signal and said second selected repetitive offset signal to provide at least said first output signal,
• and second filter means for filtering a first output signal and outputting said filtered output signal.

An apparatus for shifting a phase of an input signal having a variable frequency, said apparatus including

• means for generating a first offset signal and a second offset signal, said first and second offset signals having a frequency and phase difference with respect to said input signal,
• first path means which generates at least an intermediate signal having a frequency different from said input signal for converting the phase of said input signal in response to said first and second offset signals to produce a first output signal, said first output signal having a frequency the same as that of said input signal and a predetermined phase shift determined by said phase difference,
• a second path means for processing at least said input in response to one of the first and second offset signals to produce a second output signal, said second output signal having a frequency and a phase matching those of said input signal,
• said first path means comprising first multiplier means for multiplying said input signal and said first offset signal to provide at least a first intermediate signal,
• first filter means for filtering said first intermediate signal and outputting a first filtered intermediate signal,
• second multiplier means for multiplying said first filtered intermediate signal and said second offset signal to provide at least said first output signal,
• and second filter means for filtering said first output signal and outputting a first filtered output signal.

A method of shifting a phase of an input signal having a variable frequency, said apparatus including

• generating a first selected repetitive offset signal and a second selected repetitive offset signal, said first and second selected repetitive offset signals having a selected phase difference and a frequency difference with respect to said input signal,
• shifting the frequency and the phase of said input signal in response to said first selected repetitive offset signal to generate at least a first intermediate signal with a frequency and a phase,
• filtering said first intermediate signal and outputting a first filtered intermediate signal,
• shifting the frequency and the phase of said first filtered intermediate signal in response to said second selected repetitive offset signal to generate at least a first output signal,
• and filtering said first output signal and outputting a first filtered output signal,
• whereby said first filtered output signal has a frequency the same as that of said input signal and a predetermined phase shift determined by said selected phase difference.

A method of shifting a phase of an input signal having a variable frequency, said apparatus including

• generating a first offset signal and a second offset signal, said first and second offset signals having a mutual phase difference and a frequency difference with respect to said input signal,
• shifting the frequency and the phase of said input signal in response to said first offset signal to generate at least a first intermediate signal with a frequency and a phase,
• filtering said first intermediate signal and outputting a first filtered intermediate signal,
• shifting the frequency and the phase of said first filtered intermediate signal in response to said second offset signal to generate at least a first output signal,
• and filtering said first output signal and outputting a first filtered output signal,
• said first filtered output signal having a frequency the same as that of said input signal and a predetermined phase shift determined by said phase difference
• further comprising a step of processing said input signal in response to one of the first and second offset signals to generate a second output signal corresponding in time to said first output signal,
• said second output signal being in quadrature with said first output signal and having a frequency the same as that of said output signal.

An apparatus for operating of an input signal having varying amplitude and frequency characteristics, which apparatus changes said frequency characteristics by a chosen frequency factor to provide an output signal such that a given input frequency is converted to a new frequency defined by said frequency factor multiplied by said given input frequency, said apparatus including

• an offset signal generating means for generating a plurality of offset signals having a known mutual phase relationship;
• phase shifting means responsive to said input signal to provide a plurality of phase signals having a known mutual phase relationship, including operation in response to said input signal and a first of said offset signals to generate an intermediate signal, and further operative in response to said intermediate signal and a second of said offset signals to provide a first of said phase signals,
• frequency component means responsive to said phase signals to derive a frequency component related signal therefrom,
• amplitude component means responsive to said plurality of phase signals to derive an amplitude component related signal therefrom,
• frequency altering means responsive to said frequency component means to provide an altered frequency component related signal,
• output means responsive to at least said altered frequency component related signal and said amplitude component means to provide said output signal.