JPS59182500A - Noise signal generation circuit for digital voice insertion apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a digital audio insertion device (hereinafter referred to as SL device) that inserts a received output channel that has not been inserted into a relay channel into a digital audio insertion device (hereinafter referred to as SL device). This relates to each signal generation circuit.

Conventionally, this persimmon device has rarely been shown in Figure 1 f. 8 in the figure, (1) is transmission i = input digital u door ii
Item g1.2) is a voice output circuit for determining whether or not the sender's digital voice signal (1) is in a voiced state, +31
is based on the negative detection signal of the audio output circuit +21, and assigns the signal of the negative channel of the sender digital 1s 9 jll to the -previous negative relay channel. , +4) is a transmission control control circuit that creates a pruning signal for notifying the communication unit of the partner device of a change in the α-relative state, and +4) is composed of the above-mentioned pruning A word 3 and relay channel M number 1). SI output signal, 5) is the partner station's ・υ
The DSL input No. 4d, 16) which received the Sl output signal, connects the JIJ attachment No. 1d in the above 1) Sl input signal 5), and uses that information to output the above DS1 input signal 5).
The reception output channel number corresponding to the relay signal in the middle is the reception output channel number 4, the reception 6 output control circuit 1, till is the reception output channel 1, the reception relay channel signal attached to 41J9, and j621 is the reception, ! 11J mounting control circuit +
61 Receiving directed by i Koyori, +1
1 is a signal loss detection circuit that detects that 1lJ9 is not attached to each receiving output channel or the current relay channel by the cut signal +6 loss (71+ is the above 4)
Attachment loss detection circuit ＼t) bloomed for each communication output channel d' Attachment loss channel No. 1, +8) li
A noise generator that generates a pseudo-noise signal corresponding to the unvoiced standby noise level l, +1ill is a pseudo-noise signal generated by the output of the above-mentioned noise generator +8), and +91 is the above-mentioned IJ attachment. Lost channel signal, controlled by 7111
If the receiving output channel is connected to the relay channel, the relay channel signal +61) is applied, and if the receiving output channel is not connected to the relay channel, the noise signal is +81).
1 and outputs it as a signal of the reception output channel. The signal selection circuit . . . 0) is the reception output digital signal which is the output signal of the reception output channel.

Next, I will explain the production.

The transmitted input digital signal (1), which is digitally multiplexed with the signal of the mantissa 1, is determined by the audio production circuit (l@+2) for each channel. , +J 9-attached control circuit 13) From the channel that is in the state to the destination, the relay channel 1, which has fewer channels than the sender's Katiginer type, is selected.
When you are slashed, the ``d'' riff will notify the other station of the start of the attack, and t) SI output signal + 41
Sent as . - 10,000, in the receiver 1d of the other station, first perform the 1d number 1d from the υSIS1 input signal 5 of the f-th hand station and the desired DSI input 5), and then perform it. Based on the signal, Lyric connects the Nakabayashi Chiginel signal in the υSl input signal to the reception output channel 4 and outputs it as the reception relay channel signal 611. The issued imprinting signal is output as a received imprinting signal +62). Based on the above-mentioned received pruning signal, the IJ alignment loss detection circuit (7) determines whether each reception output channel is aligned with the relay channel and is tied to the tlJ channel, and determines whether the middle f sister channel l Corresponding to the unsharpened reception output channel t, the J riff outputs the lost channel t88 (/υ).

L) SIJdf Koyoru-dori 1d 8 is as above.
If the voice signal of the voiceless lie is relayed and it becomes silent, there will be no signal relayed, so there will be no sound at all, and there is a risk that it will feel empty compared to the baggage of rumors from the public. Because of this, - the internal noise of the job, and the
The practice is to generate pseudo-separation at a level equivalent to background noise and insert the number of the output channel that is not connected to the relay channel, and the noise equalization generator 8) generates a pseudo-noise signal for this purpose. Generates 8υ, 1B selection circuit, 9
) is the reception relay channel No. 1d for the channel where the above-mentioned 1.
611'i - selects the relay channel 31' and selects the noise signal tdll for channels 6 which are not connected, receives these <=S output digital 1 word 9 J as multiple telephone channels J stuck digital The conventional device is configured as described above, DS'47
Even if a large number of channels are to be transmitted, if the number of voiced channels at that time is less than the number of relay channels, it is not necessary to remove all voiceless channels No. 18 from the relay channels. Unless a new channel or other channel requires a voiced relay channel, the unvoiced noise signal can be transmitted directly through the already connected relay channel. Therefore, the signals of each channel that appear in the communication output are voiced signals, noise signals with a relatively short duration of unvoiced appearance, and relay channel signals that have not been pruned.
This changes in the order of the pseudo noise signals inserted on the receiving side.

Here, the noise signal level of the large number of transmission input channel signals that are input to the DSI device differs from channel to channel, and the level of the pseudo noise signal to be inserted tends to become stronger as the amount of transmission increases. In order to avoid this, the relatively low input noise levels are set to be approximately equal. For this reason, in many cases, the sudden change in the IF level that occurs when the relay channel's 41J is not tuned is significant, giving the listener a sense of unreliability.

In order to eliminate the above-mentioned drawbacks of the prior art, the present invention is designed to eliminate the above-mentioned disadvantages of the prior art. By inserting a pseudo-noise signal for each channel according to the signal level at the time of noise insertion, it is possible to reduce the sense of continuity felt when noise is inserted. The purpose is to share.

An embodiment of the present invention has been described above with reference to the drawings. In Figure 2, (↓) is the debtor's digital voice h (8
(2) C transmission audio Aida circuit, +311d transmission 1m,
A mounting control circuit, (4) is DSI output No. 18, 5)
is 051 human power signal, (6) is Uke 48 shaving control circuit 1
．． 611 is the reception relay channel signal, +621 is the number assigned for the first day of reception, -7) is the cut-off loss detection circuit, (71J
is the missing channel signal, (72 is the existing channel signal, (8) is the noise signal generated, till) is the noise No. 18 1.9) is the signal selection circuit, qO) is the received output digital audio signal, all is a reception level detection circuit, 11
2) is a noise level control signal.

Next, I will explain about the creation.

Since the operation 8 of the transmitting section of the 051 device and the operation of the reception imprinting and control circuit (6) are the same as those of the prior art, their explanation will be omitted, and only the operation 6 for generating the noise signal will be explained here.

A loss of imprinting detection circuit t'i'lld identifies for each receiving output channel whether or not a relay channel is currently being imprinted, and detects an imprinting loss channel signal for channels that are not imprinted; 1υ゛, for a channel with a cutout, d'' is attached to the existing channel signal, 72
Outputs 1. The receiving 'l-T level detection circuit till is
For each reception output channel, the communication relay channel signal P level is measured during the period when the above-mentioned scraped existing channel No. 16 (721) is transmitting a significant signal, and this is "averaged." The noise level control signal t43 is generated in proportion to the average signal level while the channel is being pruned and set.

The noise signal generator (8) generates the above-mentioned noise level control signal '8Ii.
In other words, the receiving output channel on which a high level is detected outputs a high-level pseudo-noise signal, and the receiving output channel on which a low level is detected outputs a low-level pseudo-noise signal. do. Then, the signal selection circuit 19) selects either the reception relay channel signal 611 and the noise 46 No. 18I) based on the scraped lost channel 1d No. 711, and converts these into the reception output digital audio signal No.
Output as .

In implementation 1 above, the reception level detection circuit was designed to measure the day number level by temporally averaging the one missing level.
The peak value of Ml- is ejected every time J is attached, and a control signal proportional to that value is outputted.

As described above, according to the present invention, the signal level of the signal sent from the relay channel to the receiving unit is measured, and the signal level proportional to this signal level, that is, the corresponding Generates a high-level pseudo-noise signal for lines sent at the 1d level, and low-level pseudo-noise signals for lines sent at a low level, and relays the noise signal. Since I inserted the unsharpened time in the channel, the noise level of that channel is not equal to the original, but it has the effect of obtaining free time noise with less of a sense of Ranshu. .

[Brief explanation of the drawing]

Figure 1 shows a conventional DSI device. 70 is a schematic diagram of the I sound signal generation circuit, and Figure 2 is a schematic 7072 diagram of the noise signal generation circuit of the Jsx device D by the uninvented one-end arrangement. No. 1d, 1111...reception level] Blowout circuit, 11ri...noise level 1" control signal. In addition, the same reference numerals in the figures indicate the same or equivalent parts.
Rihito Tsukuda Kuzuno - 1st
Figure 2

Claims (1)

[Claims] (1) For input digital voice signals of multiple digitally multiplexed channels, fewer relay channels than the number of transmission input audio channels are set, and the number of transmission input audio channels in the state is changed to that in the silent state. Transmission is performed by pruning the relay channel to a more preferential relay channel, and the relay channel J~$J! 17 In the noise signal generation circuit of the digital voice insertion device, which inserts a pseudo noise signal into the output channel in the receiving section 1d, for the unvoiced input voice channel i, the receiving output channel is Measure the received signal level of the reception output channel attached to the relay channel 1 and the relay channel 1, which identifies whether or not the relay channel is mowed, and the noise corresponding to the level. A noise signal of a digital audio insertion device characterized by comprising a reception level production circuit that generates a level control No. 18, and a noise signal generator that generates a pseudo noise signal controlled by the noise level control No. 18. generation circuit.