GB1379541A - Ultrasonic mobility aids - Google Patents
Ultrasonic mobility aidsInfo
- Publication number
- GB1379541A GB1379541A GB6028470A GB6028470A GB1379541A GB 1379541 A GB1379541 A GB 1379541A GB 6028470 A GB6028470 A GB 6028470A GB 6028470 A GB6028470 A GB 6028470A GB 1379541 A GB1379541 A GB 1379541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- pulses
- echo
- ultrasonic
- gating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/42—Simultaneous measurement of distance and other co-ordinates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
- G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves
- G01S15/18—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves wherein range gates are used
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B21/00—Teaching, or communicating with, the blind, deaf or mute
- G09B21/001—Teaching or communicating with blind persons
- G09B21/006—Teaching or communicating with blind persons using audible presentation of the information
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Acoustics & Sound (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- General Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
1379541 Ultrasonic ranging ST DUNSTAN'S 20 Dec 1971 [18 Dec 1970] 60284/70 Heading H4D An ultrasonic pulse-echo distance indicating device transmits pulses at a predetermined rate and the echo receiver is arranged to give an output signal in response to an echo pulse only during periods so timed with respect to the transmission instants that the output signals are provided at a rate which varies with the distance of the echo-producing object from the device. In one binaural blind-aid embodiment clock pulses are fed to a logic switching circuit providing two outputs. One output comprises pulses for triggering or gating anoscillator to periodically energize an ultrasonic transmitting transducer; the other output comprises cyclically recurring trains of pulses for opening receiving circuit gates. Echo pulses of the transmitted ultrasonic pulses are received in two channels. In each channel the output of a receiving transducer is amplified, detected and fed via a gate to an earpiece to give for each gated received ultrasonic pulse an audible pulse of amplitude dependent on the range of the echo-producing object. Fig. 3, shows an example of the timing of the gate-opening pulses. When a first ultrasonic pulse is transmitted at time t = 0 a first pulse 17 opens both receiver gates for a 64 mS period whereby any echo-producing object at a range of up to about 32 ft. will be detected and give an audible click from the earpieces. When a second ultrasonic pulse is transmitted the second gating pulse, 19, of 4 mS duration enables objects up to 2 ft. range to be detected. The third gating pulse is of 8 mS duration, and so on. The result is that in each complete train of gating pulses the number of audible clicks produced relating to an object depends on the object range, being higher at shorter ranges. Other gating pulse sequences are envisaged (Fig. 4, not shown). The transmitting transducer may be hand-held to assist directional location of an object and the receiving transducers are mounted such as to preserve intensity and/or time difference relationships in the two receiving channels.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6028470A GB1379541A (en) | 1970-12-18 | 1970-12-18 | Ultrasonic mobility aids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6028470A GB1379541A (en) | 1970-12-18 | 1970-12-18 | Ultrasonic mobility aids |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1379541A true GB1379541A (en) | 1975-01-02 |
Family
ID=10485359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6028470A Expired GB1379541A (en) | 1970-12-18 | 1970-12-18 | Ultrasonic mobility aids |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1379541A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160650A (en) * | 1984-05-25 | 1985-12-24 | Casio Computer Co Ltd | Obstacle detection system |
ES2087014A2 (en) * | 1993-10-27 | 1996-07-01 | Garcia Ramon Manrique | Device for detecting/warning of obstacles |
EP0749744A1 (en) * | 1995-06-19 | 1996-12-27 | Siemens Aktiengesellschaft | Guiding apparatus for the blind |
-
1970
- 1970-12-18 GB GB6028470A patent/GB1379541A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160650A (en) * | 1984-05-25 | 1985-12-24 | Casio Computer Co Ltd | Obstacle detection system |
US4658385A (en) * | 1984-05-25 | 1987-04-14 | Casio Computer Co., Ltd. | Obstacle detection system |
ES2087014A2 (en) * | 1993-10-27 | 1996-07-01 | Garcia Ramon Manrique | Device for detecting/warning of obstacles |
EP0749744A1 (en) * | 1995-06-19 | 1996-12-27 | Siemens Aktiengesellschaft | Guiding apparatus for the blind |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |