JPS59171240A - Digital signal transmitter - Google Patents

Abstract

PURPOSE:To detect the state of a line at digital data transmission and to perform identification of the state of line from that at voice transmission by adding a specific identification signal at the transmission of digital data and counting the identification signal at receiving at a prescribed section. CONSTITUTION:An identification signal adding circuit 15 adds identification signals 1.0 to digital data in a prescribed period. An output and a voice digital signal of the circuit 15 are modulated and transmitted to a transmission line. The signals are demodulated by a demodulating circuit 11, an up-down counter circuit 24 counts up a clock pulse in synchronization with the identification signals 1, 0 in the output taken as an up-down switching signal, and a count state detecting circuit 26 detects whether or not a count value at a prescribed section of the circuit 24 is larger than a prescribed value. Further, the digital transmission and voice transmission are discriminated and the transmission state of the digital transmission is discriminated by the output of the circuit 26.

Description

[Detailed Description of the Invention] Industrial KIJ Field The present invention relates to a digitized signal transmission device that transmits audio digital signals or digital data through the same transmission path, such as a digital mobile radio. The configuration of the conventional example and its problems Figure 1 (shows a conventional digital transmission device.The configuration of this conventional example () will be explained below along with Figure 1.In Figure 1, , 1 is a code circuit, and the input terminal f/C (1 microphone L1 PON 2 is connected to it). 3 is a modulation circuit, and the input terminal of this modulation circuit 3 (is connected to the switch (Accordingly, the output terminal of the sign-bow circuit 1 or i is connected to either the output terminal of the digital data input terminal 5 and one side C. 6 is a transmitting circuit, and this transmitting circuit 6
The input terminal (is the output terminal 1 of the modulation circuit 3, and the output terminal (σ1
:Connected to antenna 7! I'm on top.

8 (・This is a transfer multiplier circuit, and the input terminal of this receiving circuit 8 is connected to the antenna 9. One of the two output terminals is connected to the line status detection signal terminal 10, and the other is connected to the demodulation circuit 11. One side of the dI power of this demodulation circuit 11 is sent to the digital data output terminal;
The output end of the speaker is connected to the power 14.
′ □ Next, the operation of the above conventional example will be explained. The audio signal is converted into a digital signal of O゛ or (is 1'°) by the encoder circuit 1 2. One of the digital signals or the digital data output terminal 6 (marked with /) is switched to 4, and modulation/circuit 3 (
The modulated signal is converted into a predetermined frequency and power by the transmitting circuit 6vc, supplied to the antenna 7, and emitted into space as a radio wave.

The signal that has propagated through space is converted into a predetermined frequency and amplitude by the receiving circuit 8 via the antenna 9 and applied to the demodulating circuit 11. Signal: '-4 is □ outputted to terminal 10 as a line state detection signal, and □0 demodulation circuit 11 demodulates the modulated input signal □ and outputs it to 7-L.
l □ II and ゛. ', one is outputted to the speaker 14 as an audio output, and the other is outputted to the output terminal 12 as digital data.

However, the conventional example described above had the following drawbacks.

(1) Because it is not possible to distinguish between the audio transmission and the digital data output terminals, unnecessary signals may be applied to the speaker 14 during digital data transmission, or conversely, they may be output to the digital data output terminal 12 during audio transmission and may be connected. 'Continued equipment malfunctions. □ Reno □ Since there are only signals corresponding to the electric field strength in the line condition, 1 For example, if the noise figure of the receiving circuit changes, the bit error rate of □ II, l-1' I + data will change even with the same electric field strength. The correct line status could not be detected.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples, and aims to distinguish between voice transmission and digital data transmission, and to detect the line status during digital data transmission. In order to achieve the above object, the present invention adds a specific identification signal when transmitting digital data, and when receiving it, it adds a specific identification signal to the digital data.
By counting the identification signals for only a certain period, it is possible to distinguish between digital data transmission and voice transmission, and to detect the state of the line during digital data transmission. Description: The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the digital data input terminal 5-: is connected to the non-circuit with identification signal 15. This identification signal addition circuit 16 digitally outputs an identification signal "1" at a predetermined period.
〇-Microphone 7 that captures one-sided voice input Phone 2
is connected to the code circuit 1. The output ends of the code circuit 1 and the identification signal addition circuit 15 are connected to the modulation circuit 3 via the switch 4. The output ends of the modulation circuit 3 are connected to the transmission circuit 6, and the output of the transmission circuit 6 The end is connected to antenna 7.

8 is a receiving circuit, the input end of this receiving circuit 8 is connected to the antenna e, and the output end is connected to the demodulation circuit 11 h.
ing. The output of the i-tone circuit 11 is the audio data/evening discrimination circuit 1.
6, decoding circuit 17 and digital data output terminal 18
It is connected to the output (control of d switching circuit 19) input terminal of the audio data identification circuit 16, the line state detection signal terminal 20, and the lamp 21.The input terminal of the switching circuit 19 is The decoding circuit 175 is connected to the oscillation circuit 22, and the output end thereof is connected to the subee-z14.

FIG. 3 is a detailed configuration diagram of the audio data identification circuit 16 shown in FIG. The power to the down counter circuit 24 is the latch circuit 2.
5. and is connected to the input terminal of the up-down circuit 24. '1! fc, count state detection circuit 26 (
1') The human forces t, li, and l are connected to the output terminal of the runt circuit 24, and the output terminal 1 of the count state detection circuit 26 is connected to the input terminal of the latch circuit 25. .

Next, the operation of the above embodiment will be explained. In FIG. 21, the voice 1 is converted into a signal by the microphone 2, and then the signal is changed to "°O"' by the signal recircuit 1.
, "1 '" digits 1 easy (/hi can also be converted.

- Force titital data human power woman:, q-5 stamped (1 Tigital day, evening (with size identification signal) Attachment 1 and ';I
)...This wave I' Nishikikei mark is shown in Figure 4 [al.

As the input of the second modulation circuit 3, by Suinoji 4, the office No. 1 1.311 path 1 or switch/ζ is the identification 1 symbol
Either output of 7J total r1 path 15 (7) output is selected, -r: ○ city 6 sea; de: 4. Modulates the gear rear control signal inside the adjustment circuit 3. Next, the transmitting circuit 6 transmits the modulated output signal to a predetermined frequency. and ¥11 force, which is sent out into space through the entire Andena 7.

On the other hand, the receiving circuit 8 converts the minute input signal detected by the antenna 9 into a predetermined frequency signal and supplies it to the -7 demodulation circuit 11. By this demodulation circuit 11, 'o
”, “1”’ digital signal is demodulated!■, this digital signal, the digital signal of the digital signal, the voice, the E number is set to 1 in the output signal name of the booter identification field I6, and it is output as the digital signal L data. It is supplied to terminal 18.

When the identification signal 1-1 of the audio/data identification circuit 16 is active, the upper voice signal output from the 1-1 circuit is off.
l circuit 19〈iλAs L sub-basket 4 all, 1 drive''
SR l-, the audio is played. 3! ! When the identification number is 1', the output of the oscillation circuit 22 is applied to the speaker 14, and an alarm is sounded to notify the time to the digital boot receiver, and the lamp 21 is lit at the same time. 1.Identification viewing moon (short line condition IB signal - bow terminal 20 all through the outside i'l □be'&n K);
hru.

Next, the operation of the voice and data identification circuit 16 will be explained using FIG. −First, human power;
The waveform shown in FIG. 4(b) is applied to the ID t'11, and the up/down counter circuit 24 is switched between amplifier and down.
I can stay once a month as a believer. On the other hand, timing occurrence 1
iurax 231-j - From the above input signal, generate a pulse corresponding to the tie 13 slot. This waveform is the 41st branch 1(d)
-6 inches. This pulse is used as one pulse for the up/down counter circuit 24.By connecting in this way, the up/down counter circuit 211
When the identification signal is "1", it operates as an amplifier counter, and conversely, when it is "○'", it operates as a down counter.The output of the up/down counter circuit 24 (Fig. 4(e) to fq
! ) i, dimension, 1 tear JJ to the count state detection circuit 26
(Experiment N) When the value of tl becomes larger than a certain value, the output becomes "1", and the output becomes "1", and the output is passed to the next latch circuit 25 (.tau. mark 7J1.).

The timing generating circuit 23 generates a pulse C that determines a certain section based on the mail of the 41st female LDI.
Using this pulse, count state detection 1',,j'']
The output of ll'jj' T26 is held in the latch circuit 25 (Fig. 4(f)), and the output of the knob counter is
:((t ``○゛nishi-t'-set to count start state-ito,'') When transmitting sound, Yamashin Tsubasa, and when there are many errors in line No. 1 (No. 4) Figure (b)
The identification signals shown in (are "0"° and "°1"
Up/down counter circuit 2 because it occurs at beans, 1, and ζ
WM in the form of 4 ((J is almost zero, but -Y-ia: 'ta, l-, -';6'' when transmitting signals is almost amp-counted if there are few code errors. Since the count value of the counter circuit 24 is a large positive value, the count value of the counter circuit 24 is 51. for the non-count state detection circuit 26 and the discrimination size 1, )ζ-,-.

Distinguish the length of data transmission I and the time of voice transmission.
It is possible for Yumizu to make a mistake (JJ's state and I soil can be issued).

Discomfort caused by non-implementation (・-[Voice transmission station knee, f1 shift/L = fJ-Identified the evening beast sending flash 65-Sunday transmission time)'S-, IA' Cut Q-
It is possible to turn on the lamp by setting r zll and (, 15-th ara, which informs digital data transmission) to 11β. Since it is also possible to detect that the code error is greater than the value, it has the advantage that the state can be notified to an external device that malfunctions due to a code error.

In the above embodiment, 1" may be added as an identification signal, or °'O"° may be omitted. An effect shown by j/rC can be obtained.

(-a) Day! Audio transmission port by encoder during transmission,
Since it can distinguish between J and ゛, it automatically prevents unpleasant sounds from being played during data transmission. (6 tb) Since it detects the code error status of the line during digital data transmission, it is necessary to notify the above status to the external equipment in the tizicle operation (( Therefore, malfunctions can be prevented.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional digital signal transmission device.
No.? The figure is a block diagram of a digital signal transmission device according to an embodiment of the present invention, FIG. 3 is a block diagram of the main parts of the device, and FIGS. 4(a) to 4(h) are diagrams explaining the operation of the device. 1... code circuit, 2...-microphone, 3...
... Modulation circuit, 5 ... Digicle 1 data input terminal, 6 ... Transmission circuit, 7 ... Antenna,
8... Pot, double circuit, 9... Antenna, 11
... Demodulation circuit, 14 ... mark, speaker, 15 ...
- Identification signal addition circuit, 16... - Audio, data identification circuit, 17... Decoding circuit, 18... Digital data output terminal, 19... Switching circuit, 20...
...Line status detection signal terminal, 21...Lamp. 22...Oscillation circuit, 23-...Timing generation circuit. 24...Awap down counter circuit, 25. Mountain.
Ushichi circuit, 26...Karan) state' detection circuit.

Claims (1)

[Claims] Scheduled laps in the evening! Identification signal "1" at 11
or 'O''' i)
A modulation circuit modulates the encoded audio and digital signals, and the output of this modulation circuit is transmitted wirelessly.
1111 = father is O ``up''
Down switching signal and [7 The above identification signal is measured 1゛ or ゛O.
Is it the opposite of the number? ″] 吋” o ”also 1f:'L ” i
"Down counter] / to start the knob down counter circuit and the count state horizontal +1 to detect whether the count value of the predetermined section of this knob counter Uno counter 1 path is larger than the predetermined 1 m; 41, and each output (/) of this count state detection is used to determine whether data transmission or voice transmission and the transmission state of digital data transmission are determined. Code transmission device.