| (19) |
 |
|
(11) |
EP 0 314 487 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
11.10.1989 Bulletin 1989/41 |
| (43) |
Date of publication A2: |
|
03.05.1989 Bulletin 1989/18 |
| (22) |
Date of filing: 28.10.1988 |
|
| (51) |
International Patent Classification (IPC)4: G10K 11/34 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB |
| (30) |
Priority: |
29.10.1987 US 114815
|
| (71) |
Applicant: Hewlett-Packard Company |
|
Palo Alto,
California 94304 (US) |
|
| (72) |
Inventors: |
|
- Hunt, Thomas J.
Derry, NH 03038 (US)
- Lipschutz, David
Lexington, MA 02173 (US)
- Savord, Bernard J.
Ithaca, NY 14850 (US)
|
| (74) |
Representative: Williams, John Francis et al |
|
WILLIAMS, POWELL & ASSOCIATES
34 Tavistock Street
London WC2E 7PB
London WC2E 7PB (GB) |
|
| |
|
| (54) |
Delay coefficient calculator |
(57) Apparatus for calculating the delay coefficients to be used for the transducer of
a linear array at successive focal points along each radial line of a sector along
which ultrasonic pulses are transmitted comprising a plurality of clocked accumulators
connected in series (AC3,AC2,AC1) said accumulators being preloaded with appropriate
combination of the coefficients of the successive terms of a series expressing an
approximation of the formula, D = R - √(X-Xo)² + Yo² where R is the distance of a
focal point from a given point in the sector, X is the number of the accumulator from
the origin and Xo, Yo are the coordinates of the focal point.