JPH083110Y2 - Selective call signal receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a selective call signal receiver having a battery saving circuit, and more particularly to its synchronous monitoring and control of the battery saving circuit.

[Prior Art] A conventional selective call signal receiver is disclosed in Japanese Patent Laid-Open No. 62-160830.
It was like.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technique, as shown in FIG.
Even if the code string DATA in the selective calling signal can be correctly reproduced, if the synchronization is lost once when the receiving processing of the code string DATA is performed, the error detection signal of the selective calling code in the selective calling signal is thereafter detected. ERROR is output as an error (306), and since it continues, it is determined that the selective call signal is shortly cut off, the reception of the selective call signal ends, and only the preamble detection is performed. FIG. 3 is a timing chart showing the situation, which will be described with reference to this figure. Code string DA
TA starts with selective call signal disconnection 305, preamble 3
01, batch 302 and so on. A number of batches 302 are continuously sent. At the beginning of each of the batches 302, there is a sync code sequence 303, and after that, there are eight frames each. For one receiver, one or more of the eight frames becomes the own frame 304. The battery saving signal PWSV cancels the battery saving for a very short time at a constant interval during the selective call signal disconnection 305, and performs preamble detection. Code string DATA
When the preamble 301 appears, the preamble detection signal P
Battery saving signal PWSV is synchronized code string by REAM
The battery saving is canceled until the 303 detection signal SYNC is output. The battery saving signal PWSV cancels the battery saving only at the position of the own frame 304 after the synchronization code string 303 is detected. When an error is detected in the code string DATA, an error detection signal ERROR is output, and if this signal continues for a predetermined time, the battery saving signal PWSV stops the battery saving cancellation in its own frame and continues the selective call signal. As in the case of disconnection 305, only preamble detection is performed. Therefore, even if the synchronization is lost, the error detection signal ERROR continues until it is re-synchronized, which causes the problem that the same operation as the disconnection of the selective call signal occurs even if there is a correctly reproduced code string DATA. there were.

Therefore, the present invention solves such a problem,
The purpose is that, if the selective call signal is continuously sent after the frame synchronization is lost, the first synchronization code string that is continuously transmitted after the frame synchronization is lost. The purpose is to provide a selective call receiver that regains frame synchronization by receiving an SC and prevents the subsequent selective call signal from not being received.

[Means for Solving the Problems] A selective call signal receiver of the present invention has a selective call code error detection means in a selective call signal and a battery saving circuit, and receives and processes the selective call signal. In the above, a synchronization code string monitoring means for controlling the battery saving circuit and receiving the synchronization code string according to an error detection signal from the error detection means is provided.

[Operation] According to the above configuration of the present invention, when the frame synchronization is lost even though the selective calling signal is correctly reproduced, this selective calling code error detecting means in the selective calling signal detects this code string. It is judged as an error. The battery saving circuit is controlled by the error detection signal from the selective call code error detection means, and the synchronous code sequence is received at the position of the first synchronous code sequence in the selective call signal continuously sent to the selective call signal. The circuit works as you can. When the sync code sequence can be received, frame synchronization is re-synchronized, and subsequent reception becomes possible.

[Embodiment] FIG. 1 is a block diagram of a main part of an embodiment of the present invention, that is, a synchronous code string monitoring means. A selective calling code error detecting means 101 in a selective calling signal, a battery saving circuit 102, and a synchronous code string. It has a detection circuit 103. The selective calling code error detecting means 101 in the selective calling signal is configured to select the selective calling code DATA of a predetermined frame in the selective calling signal and the clock signal.
In response to CLK, the presence or absence of an error in the selective calling code is detected, and if there is an error, an error detection signal ERROR is output. The battery saving circuit 102 receives the error detection signal ERROR, the preamble detection signal PREAM, the synchronous code string detection signal SYNC, and the clock signal CLK. Then, when the error detection signal ERROR is continuously detected over a predetermined time,
It is determined that the selective call signal disconnection or out-of-sync has occurred, and the receiving circuit is operated at the position of the sync code string expected to come next. When the synchronous code string is detected and the synchronous code string detection signal SYNC is input, the receiving circuit is operated at the position of the own frame that continues, and the same operation as before is performed. If the sync code string is not detected, it is determined that the selective call signal is disconnected, the reception operation up to now is stopped, and the reception circuit is operated for a short time at a constant interval only for detecting the preamble.

FIG. 2 is a timing chart for explaining the operation of the main part of the embodiment of the present invention, that is, the operation of the synchronous code string monitoring means.
Selective call code in selective call signal in chart
The timings of DATA, battery saving signal PWSV, preamble detection signal PREAM, synchronous code string detection signal SYNC, and selective call code error detection signal ERROR in the selective call signal are shown.

FIG. 2 (a) shows a main feature of the present invention when the selective call signal DATA 205 is sent from the state of the selective call signal disconnection 205 to the preamble 201 and then two batches 202 and the state of the selective call signal disconnection 205 is again made. FIG. 6 is a timing chart showing the operation of the unit, that is, the synchronous code string monitoring means. At the beginning of each of the batches 202 is a sync code sequence 203, followed by eight frames. One or more of the eight frames is the own frame 204. The selective call signal receiver releases the battery saving by the battery saving signal PWSV at regular intervals for a very short time. When the preamble 201 is sent as the selective call code DATA, the preamble detection signal PRE
Due to the AM, the battery saving signal PWSV is not released immediately after the battery saving signal that has been released is released, and is kept released until the sync code string detection signal SYNC is output. The synchronization code string detection signal SYNC causes the battery saving signal PWSV to cancel the battery saving only in the own frame 204 thereafter. When the selective call code DATA becomes the state of selective call signal disconnection 205, the selective call code error detection signal ERROR is output when the battery saving signal PWSV cancels the battery saving at the position of the own frame. When the selective call code error detection signal ERROR continues for a predetermined time (two code strings in this case), the battery saving signal PWSV cancels the battery saving at the position of the next sync code string. In the case of FIG. 2 (a), since the synchronous code string is not sent, the synchronous code string detection signal SYNC is not output. Therefore, it is determined that the selective calling signal is disconnected and the battery saving signal PWSV is output.
Continues the battery saving release operation for preamble detection.

FIG. 2B shows the case where the preamble 201 and the batch 202 are continuously sent from the state of the selective call signal disconnection 205 as the selective call code DATA and when the synchronization is lost on the way. FIG. 4 is a timing chart showing the operation of the main part of the present invention, that is, the synchronous code string monitoring means. The synchronization code string detection signal SYNC
It is the same as in FIG. 2A until the saving signal PWSV releases the battery saving only at the position of the own frame. If the battery saving signal PWSV cancels the battery saving at the position of its own frame and the synchronization is lost, the selected calling code error detection signal ERROR
Is output. The selective call code error detection signal ERRO
When R continues for a certain period of time (two code strings in this case), the battery saving signal PWSV cancels the battery saving at the position of the next sync code string. In the case of FIG. 2 (b),
Since the sync code string 203 is sent and the battery saving cancellation timing of the battery saving signal PWSV is at least 1 bit before and after the sync code string position, the sync code string is detected and resynchronized, and The sync code string detection signal SYNC is output, and the battery saving signal PWSV continues the operation of canceling the battery saving only at the position of the own frame as before.

[Advantage of Device] As described above, according to the device, it is possible to select the reception of the subsequent synchronous code sequence according to the error detection output of the selective call code in the selective call signal.
It is possible to resynchronize the frame synchronization that has been once lost, and prevent the non-reception of the selective call signal that is continuously transmitted.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of the present invention, that is, a sync code string monitoring means. FIG. 2 is a timing chart showing the operation of the main part of the embodiment of the present invention, that is, the synchronous code string monitoring means. FIG. 2 (a) is a timing chart showing the operation when the selective call signal is disconnected. , FIG. 2 (b) shows the timing when the out-of-sync occurs.
Chart diagram. FIG. 3 is a timing chart for explaining the operation of the conventional synchronous code string monitoring means.

Claims (1)

[Scope of utility model registration request] 1. A radio receiver having a selective calling code error detecting means in a selective calling signal and a battery saving circuit, which receives and processes the selective calling signal, according to an error detecting signal from the error detecting means. A selective call signal receiver comprising a sync code string monitoring means for controlling the battery saving circuit and receiving a sync code string.