JPH0574039U - PCM analyzer - Google Patents

Abstract

(57) [Summary] [Purpose] To allow the person without the expert to easily judge the contents of the PCM signal on the PCM line. [Configuration] Connect the measurement cable terminal 2 to the PCM line,
The PCM signal on the channel set by the channel setting selection switch 3 is converted into visible data and displayed on the display device 4, and D / A converted and output from the speaker 5 to facilitate the PCM signal of the specific channel. It is possible to judge.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a PCM analyzer that determines the content of a PCM line signal.

[0002]

[Prior Art]

 Conventionally, in order to judge the content of a PCM line signal, a measuring instrument having a signal waveform display device such as a synchroscope was connected to the PCM line.

FIG. 3 shows an example of signals on a PCM line. On the PCM line, the synchronous signal (hereinafter referred to as FP) 31 of FIGS. 3A and 3D, the clock signal (hereinafter referred to as CLK) 32 of FIG. 3B, and FIG. , (E) PCM signal (hereinafter referred to as PCM) 33. The measurer found the specific channel by counting the number of C LKs 32 based on the FP 31 from the signal wave displayed on the display device of the measuring machine. Note that FIGS. 3A and 3C are enlarged views of the FP 31 and the PCM 33 of FIGS. 3D and 3E, respectively.

In order to determine whether the signal of the PCM line is voice data, the measurer had to make an experience determination based on the shape of the waveform displayed on the measuring machine and the situation at the time of measurement.

[0005]

[Problems to be solved by the device]

 There is a problem that it is difficult to make a decision when using the above-mentioned conventional measuring equipment such as a synchroscope because it is visually observed by the operator to find a specific channel on the PCM line.

In addition, when voice and data are transmitted on the PCM line, the contents of these signals cannot be distinguished only by using a measuring instrument, and finally a person makes a judgment, which must be an expert. There was a problem that it could not be judged.

An object of the present invention is to provide a PCM analyzer capable of easily determining the content of an arbitrary channel on a PCM line even by an unskilled person.

[0008]

[Means for Solving the Problems]

 The PCM analyzer of the present invention comprises a measurement cable terminal connected to a PCM line, a selection switch for setting a specific channel, a display device for displaying data of the PCM signal input from the measurement cable terminal, and the PCM signal. , A channel counter that counts the number of channels from the synchronization signal and clock signal input from the measurement cable, and a comparator that compares the values of the selection switch and the channel counter. A shift register for converting a PCM signal input from the measurement cable terminal into a parallel signal; a video RAM controller for controlling the display device from inputs of the channel counter, the shift register and the comparator; PCM signal from the cable terminal and the comparator A PCM channel selection selector for selecting a PCM channel receives input and the PCM signal through the PCM channel selection selector and a D-A converter to be sent to the speaker into an analog signal.

[0009]

【Example】

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention. The PCM analyzer 1 has a FP terminal 2a for a synchronization signal connected to the PCM circuit, a CLK terminal 2b for a clock signal, and a PCM IN terminal 2C for a PCM signal, which has a measurement cable terminal 2. There is.

Further, this PCM analyzer is a display device using a channel selection switch (hereinafter referred to as SW) 3 for setting a channel of a PCM line on its upper surface and a liquid crystal or the like for displaying PCM signal data. 4 and a speaker 5 for outputting the sound of the PCM signal.

FIG. 2 is a block diagram of the internal configuration of FIG. Please refer to FIG. 3 as well for a detailed explanation. Connect each terminal of the measurement cable terminal 2 to the PCM line and set SW3 to the channel number you want to measure. The FP31 and CLK32 input to the FP terminal 2a and the CLK terminal 2b respectively count the number of channels in the channel counter (hereinafter, referred to as CNT) 21 of the detection unit 11, and the counted channel count data is stored in the comparator ( Hereinafter, it is sent to a COMP 22) and a video RAM controller (hereinafter VRAM) 23 which is a display control device of the display unit 12.

The channel count data sent to the VRAM 23 is input as a line feed signal when PCM data is displayed on the display device 4. In COMP22, the channel number set by SW3 is compared with the channel count data input from CNT21, and when the channel is set by SW3, the signal is VRAM23 and PCM channel selection selector (hereinafter referred to as SEL). And 24 as a selection signal.

The FP 31 and the CLK 32 are input to the FP terminal 2 a and the CLK terminal 2 b, respectively, and at the same time, the PCM 33 input to the PCM IN terminal 2 C is connected to the SEL 24 of the detection unit 11 and the shift register (hereinafter referred to as SFT). Note) 25 is input. In the SEL 24, the channel set by the SW 3 of the CPM 33 is selected by the selection signal input from the COMP 22, and the selected channel is input to the DA converter (hereinafter, referred to as CON V) 26 of the audio unit 13. In the CONV 26, the contents of the set channel of the PCM 33 are converted from a digital signal into an analog signal and output as sound from the speaker 5.

On the other hand, the PCM 33 input to the SFT 25 is converted from a serial signal into a parallel signal and sent to the VRAM 23 of the display unit 12. For the parallel signal of the PCM 33 input to the VRAM 23, the channel set by the SW 3 is selected by the selection signal from the COMP 22, and the channel content is displayed on the display device 4. Then, the VRAM 23 breaks the channel contents of the PCM 33 displayed on the display device 4 each time the channel set by SW3 is selected by the carriage return signal from the CNT 21 and the selection signal from the COMP 22.

The method of displaying the contents of the PCM 33 on the display device 4 is not limited to the method of starting a line feed each time a channel is selected.

[0017]

[Effect of the device]

 As described above, according to the present invention, the contents of an arbitrary channel on the PCM line can be easily determined even by an unskilled person by selecting a specific channel on the PCM line with the selection switch and listening to the display device and the speaker. There is an effect.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a block diagram of an internal configuration of FIG.

3A to 3E are examples of signals on a PCM line.

[Explanation of symbols]

 1 Housing 2 Measurement Cable Terminal 2a FP Terminal 2b CLK Terminal 2c PCM IN Terminal 3 SW 4 Display Device 5 Speaker 11 Detecting Section 12 Display Section 13 Audio Section 21 CNT 22 COMP 23 VRAM 24 SEL 25 SFT 26 CONV 31 FP 32 CLK PCM

Claims (1)

[Scope of utility model registration request] 1. A measurement cable terminal connected to a PCM line, a selection switch for setting a specific channel, a display device for displaying data of a PCM signal input from the measurement cable terminal, and the PCM signal as voice. A speaker that outputs, a channel counter that counts the number of channels from a synchronization signal and a clock signal that are input from the measurement cable, a comparator that compares the values of the selection switch and the channel counter, and the measurement cable. A shift register for converting a PCM signal input from a terminal into a parallel signal, a video RAM controller for controlling the display device from inputs of the channel counter, the shift register and the comparator, and a PCM from the measurement cable terminal. A PCM channel that receives a signal and an input from the comparator. A PCM channel selection selector for selecting a channel and a DA converter for converting the PCM signal into an analog signal via the PCM channel selection selector and sending the analog signal to the speaker.
CM analyzer.