Ultrasonic transmitting-receiving apparatus

• US 5,515,339 A
• Filed: 11/15/1994
• Issued: 05/07/1996
• Est. Priority Date: 11/15/1994
• Status: Expired due to Term

• Current Assignee: Honda Electronics Co., Ltd.
• Original Assignee: Honda Electronics Co., Ltd.
• Inventors: Noda, Tetsuya
• Primary Examiner(s): Pihulic, Daniel T.
• Application Number:
  US08/339,768
• Time in Patent Office: 539 Days
• Field of Search: 367/903, 367/100, 367/909
• US Class Current: 367/100
• CPC Class Codes: G01S 15/101 Particularities of the measurement of distance G01S15/12, G01S15/14, and G01S15/18 take precedence
• CPC Class Codes: Y10S 367/903 Transmit-receive circuitry

Abstract

Intervals of timing pulses generated by a timing pulse generating means are changed by an interval changing means, interference signals from a second vibrator having the same intervals of the timing pulses being eliminated by changing the interval of the timing pulses by the interval changing means.

Claims

1. An ultrasonic transmitting-receiving apparatus comprising:

timing pulse generating means for generating timing pulses during a plurality of different generating intervals,

interval changing means for setting a next generating interval to be different from one generating interval,

oscillator means for generating pulse signals in response to the timing pulses from the timing pulse generating means,

ultrasonic vibrator means for;

generating one pulse-like ultrasonic wave in response to one pulse signal from the oscillator means during said one generating interval,

receiving one echo ultrasonic wave in water in response to said one pulse-like ultrasonic wave generated by said ultrasonic vibrator,

generating a next pulse-like ultrasonic wave in response to a next pulse signal from the oscillator means during the next generating interval,

receiving a next echo ultrasonic wave in water in response to said next pulse-like ultrasonic wave generated by said ultrasonic vibrator,

converting said one echo ultrasonic wave to one echo signal, and

converting said next echo ultrasonic wave to a next echo signal,

receiving means for amplifying the one echo signal and the next echo signal from the ultrasonic vibrator means,

memory means for successively storing the amplified one echo signal and the amplified next echo signal from the receiving means, and

correlation means for eliminating different signals between said amplified one echo signal and the amplified next echo signal stored in said memory means.

2. An ultrasonic transmitting-receiving apparatus as set forth in claim 1, further comprising a display device for displaying common signals from the correlation means.

3. An ultrasonic transmitting-receiving apparatus as set forth in claim 1 wherein the interval changing means includes an operating means.

4. An ultrasonic transmitting-receiving apparatus comprising:

timing pulse generating means for generating timing pulses having a plurality of different generating intervals,

oscillator means for generating pulse signals in response to the timing pulses from the timing pulse generating means,

ultrasonic vibrator means for;

generating a first pulse-like ultrasonic wave in response to a first pulse signal from the oscillator means,

receiving a first echo ultrasonic wave in water in response to said first pulse-like ultrasonic wave generated by said ultrasonic vibrator,

generating a second pulse-like ultrasonic wave in response to a second pulse signal from the oscillator means,

receiving a second echo ultrasonic wave in water in response to said second pulse-like ultrasonic wave generated by said ultrasonic vibrator,

converting said first echo ultrasonic wave to a first echo signal, and

converting said second echo ultrasonic wave to a second echo signal,

receiving means for amplifying the first echo signal and the second echo signal from the ultrasonic vibrator means,

memory means for successively storing the amplified first echo signal and the amplified second echo signal from the receiving means,

correlation means for eliminating different signals between said amplified first echo signal and the amplified second echo signal stored in said memory means, and

interval changing means for setting the generating interval of said second pulse signal different from the generating interval of said first pulse signal so that interfering signals in said first and second intervals having different timings to produce said different signals, and are thereby eliminated by said correlation means.

5. An ultrasonic transmitting-receiving apparatus as set forth in claim 4, further comprising a display device for displaying common signals from the correlation means.