发明名称 |
Pulse length encoded transmitter/receiver |
摘要 |
<p>A transmitting/receiving apparatus comprises a means for transmitting phase modulated signals and a receiver having a waveform shaper and a discriminator for determining the presence of binary 0 and 1 in the received signal. The received signal comprises regularly repeated inverted and non-inverted signal groups. A leader code is provided for each signal group and indicates whether the following group is inverted and defines a reference bit of duration 2T. A unit period of time T may be defined as representing a 0 and some integer multiple of this unit period to represent a 1. A high and subsequent low level of the signal are said to define a unit bit, measurement of the period of two successive unit bits is used to discriminate between 0 and 1. The above apparatus may be used to transmit inclination data of a remote detector with respect to a source from the detector back to a base computer, for example to move a cursor on a display screen. The coordinates of a source relative to a detector or vice versa may also be transmitted.</p> |
申请公布号 |
GB2317253(A) |
申请公布日期 |
1998.03.18 |
申请号 |
GB19970022589 |
申请日期 |
1994.11.23 |
申请人 |
* ALPS ELECTRIC CO., LTD. |
发明人 |
YICHI * UMEDA;JUNICHI * SAITO;ICHIIRO * MORISHITA;MASARU * NAKAYAMA;ARAO * SATO;KAZUHIRO * KATAGIRI |
分类号 |
G01S3/781;G01S3/783;G01S3/784;G01S5/16;G06F3/033;G06F3/0354;G06F3/042;(IPC1-7):G08C19/22 |
主分类号 |
G01S3/781 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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