Receive filtering and filters for phase or amplitude coded pulse sequences

A system for generating information responsive to pulse sequences, the system comprising:

• a receive beamformer for generating first and second beamformed signals responsive to sequential first and second transmit pulses, respectively;
• an adder for combining of the first and second beamformed signals;
• and
• a filter connected between the beamformer and the adder, the filter operable to filter the first beamformed signals, the filter including at least two taps where the filter applied to the first beamformed signal is different than filtering applied to the second beamformed signal.

A method for generating information responsive to phase or amplitude coded pulse sequences, the method comprising:

• (a) combining of first and second beamformed signals responsive to sequential first and second transmit pulses, respectively;
• (b) discriminating between two media based on (a);
• (c) filtering the first beamformed signal prior to (a) in response to a first spectral response with at least two taps;
• and
• (d) filtering the second beamformed signal prior to (a) in response to a second spectral response, the second spectral response different than the first spectral response.

A system for generating information responsive to phase or amplitude coded pulse sequences, the system comprising:

• a receive beamformer for generating first and second beamformed signals responsive to sequential first and second transmit pulses, respectively;
• an adder for combining of the first and second beamformed signals;
• and
• an at least two tap filter connected between the beamformer and the adder, the filter operable to filter the first and second beamformed signals in response to first and second spectral responses, respectively, the second spectral response different than the first spectral response.

A method for generating information responsive to phase or amplitude coded pulse sequences, the method comprising:

• (a) combining of first and second beamformed signals responsive to sequential first and second transmit pulses, respectively, the first transmit pulse having one of a different phase and amplitude than the second transmit pulse;
• (b) discriminating between non-linear and linear information based on (a);
• (c) filtering the first beamformed signal prior to (a);
• and
• (d) providing at least one of a frequency dependent amplitude weighting and frequency dependent phase shift based on (c).

A system for generating information responsive to phase or amplitude coded pulse sequences, the system comprising:

• a receive beamformer for generating first and second beamformed signals responsive to sequential first and second transmit pulses, respectively, the first transmit pulse having one of a different phase and amplitude than the second transmit pulse;
• an adder for combining of the first and second beamformed signals;
• and
• a filter connected between the beamformer and the adder, the filter operable to filter the first and second beamformed signals to provide at least one of a frequency dependent amplitude weighting and frequency dependent phase shift to the first and second beamformed signals.