JPH04140939A - High efficiency voice encoding device - Google Patents

Abstract

PURPOSE:To attain the transmission of a fixed pattern other than a voice signal by a high efficiency voice encoding device by detecting a fixed pattern of a PCM code at a sender side, sending the presence of the signal in terms of the presence of a digital signal of a specific pattern and allowing the receiver side to output the presence of the signal in terms of the fixed pattern of the PCM code. CONSTITUTION:A 1st fixed pattern detection circuit 5 of a transmission section outputs a 1st detection signal 6 of an H level when a specific fixed PCM pattern in the PCM signal of a voice band is detected. Thus, a high efficiency voice encoding circuit 3 is reset and a 1st selection circuit 9 selects and outputs a 1st fixed pattern signal 8 of a 1st fixed pattern generating circuit 7. On the other hand, when a 2nd fixed pattern detection circuit 16 of a reception section detects a 1st specific pattern signal inserted by the sender side in the digital signal, the circuit 16 outputs a 2nd detection signal 17 of an H level and a high efficiency voice decoding circuit 14 is reset and a 2nd selection circuit 20 selects and outputs a 2nd fixed PCM pattern signal 19 of a 2nd fixed pattern generating circuit 18. Thus, the fixed pattern other than the voice is sent by the high efficiency voice encoding device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-efficiency speech encoding device 1, particularly in the speech band (30011rs to 3.400 Hz) (D6
The present invention relates to a high-efficiency speech encoding device K that converts No. 4 Khpn No. 6 into a low bit rate digital signal and transmits the converted signal.

[Conventional technology]

L1 response prediction type ADPC is added to the conventional high-efficiency speech coding device.
M encoding device, multipath encoding device and APC, -
There are AB encoding devices and the like. These encoding devices are devices that encode audio so that it can be transmitted at a low bit rate.
The data is encoded at pit speeds such as 8Kb/L and 8Kb/L.

[Problems to be solved by the invention L2] Conventional high-efficiency speech encoding devices encode speech in a manner that is uniform, so it cannot be used for snoring that transmits signal tones on fixed days and evenings. The disadvantage is that it cannot be done.

[Failure to solve Ren@]

The high-efficiency speech encoding device according to the present invention has p
a1m audio signal pitch coded digital signal (
(conversion [,7); and means for detecting a specific fixed pattern in the PCM audio signal and transmitting the specific pattern as a digital signal; Digital signal tone P sent from
The receiving section has a means for decoding into a CM audio signal and a means for detecting a specific pattern of digital signal f and outputting the signal sound in a fixed pattern of the PCM code.

[Effect]

According to the present invention, fixed patterns other than the sound P signal can also be transmitted using a high-efficiency speech encoding device.

〔Example〕

FIG. 1 is a circuit diagram showing an embodiment of a high efficiency speech encoding device according to the present invention. In the figure, 1 is an input terminal on the transmitting side into which the voice band PCM signal 2 is input;
converts this audio band PCM signal 2 into a low bit speed digital signal 4 encoded with high frequency and outputs it, and rehits when the following first detection signal is input to the reset terminal A3. High-efficiency speech encoding circuit on the transmitting side, 5
detects the presence or absence of a specific fixed PCM pattern in the two PCM signals mentioned above, and when it is present, the first detection signal is sent to the first detection signal, and when it is absent, the first detection signal is detected. is 1”
' L The first fixed pattern detection circuit on the transmitting side that becomes the J level, T is the 1iKx fixed pattern detection circuit on the transmitting side that outputs the specific first fixed pattern signal 8, 9 is the selection terminal - When the first detection signal 6 with a level of 1゛H is input to f9m, the first fixed pattern signal 8 is selected and output,
When the first detection signal 6 at the L6 level is input, the xth signal on the transmitting side selects and outputs the digital signal 4. Episode 3. First fixed pattern detection circuit5. First fixed pattern generation [consisting of circuit 7 and selection circuit 9 IJ-transmission section, 12#:t, transmission line, 13 is reception terminal-1 into which the digital signal sent through this transmission line 12 is input
14 decodes the input digital signal sound PCM audio signal 15 and outputs it, and 5 reset terminal 'F 14 t
16 is inserted into the received digital signal on the transmitting side, and is reset when the second detection signal 8 is input. A second fixed pattern detection circuit on the receiving side detects the presence, and when it is "present", the N2 detection signal 11 is at the iJ level, and when "absent", the second detection signal 1T is at the rL, J level. 8 is a specific second fixed pattern signal 1
a second fixed pattern generation circuit on the receiving side that outputs 9;
1'-1! to the selection terminal 20a! - Specified second fixed pattern signal 1 when the second detection signal 17' of J level is input.
Select 9 and output 1, "L" level second detection compensation code 1
r is input 1. 2 slow output circuit on the receiving side that outputs the decoded digital signal 5, 21 is an output terminal, 22 #S
't, the above-mentioned high-efficiency audio decoding circuit 14. 2nd fixed buckoon detection circuit 16゜Second fixed buckoon generating circuit 1・
ai? - and a second selection circuit 20.

Next, the operation of the highly efficient voice waiting/processing device having the above configuration will be explained. First, in the transmitter 11, P of the monoblind voice band is
The CM signal No. 2 is inputted to the high-efficiency speech encoding circuit 3 and the coffin fixed bag detection circuit 5 via the input terminal 1.

The high-efficiency speech encoding circuit 3 converts the digital signal 4 into a low-speed bit rate digital signal 4 that has been encoded with high efficiency, and outputs it to the first selection circuit 9 . On the other hand, when the first fixed pattern detection circuit 5U detects a specific fixed PCM pattern during the PCM signal period of the Ondo terminal, it outputs the first detection signal '6 of [, J level. As a result, the high-efficiency speech encoding circuit 3 is reset broken, and the first selection circuit 9
The fixed backup signal 8 is selected and output. Further, when the fifth fixed pattern detection circuit 5 does not detect a specific fixed PCM bakun in the PCM signal of the sound P band, rLJ
The first detected level G is output to the first selection feed 9.

In response to the input of the first detection signal 60 at the 114'' level, the first selection circuit 9 performs high-efficiency encoding output from the high-efficiency 1P encoding circuit 3 to generate the digital signal 4 at a bit rate of Select and output. ,in this way,
[When the first detection signal 6 of J level is output, that is, when a specific fixed PCM pattern is detected in the PCM signal, the transmitter 11 transmits the specific fixed PCM pattern.
- The first fixed pattern signal 8 synchronized with the transmission ws, .
-i 2. When the first detection signal 6 at the f'LJ level is output, that is, when no specific fixed PCM pattern is detected in the PCM signal, the digital signal 4 is encoded with high efficiency and transmitted at a low bit rate. Road 12
will be sent to.

In the receiving section 22, the digital signal sent from the transmission line 12 is sent to the high-efficiency audio decoding circuit 14 via the receiving terminal 13.
and is input to the second fixed pattern detection circuit 16. This high efficiency audio decoding circuit 14 uses this digital signal sound PC.
The M audio signal 15 is decoded and output to the second selection circuit 20. On the other hand, the second fixed pattern detection circuit 16 outputs a second detection signal 17 at the raJ level when detecting a specific I-th specific pattern signal sound inserted into the digital signal on the transmitting side. Therefore, the high-efficiency speech decoding circuit 14 is reset, and the second selection circuit 20 is reset to the second fixed pattern generation circuit 1.
8 specific second fixed PCM pattern signals 19 are selected and output. Further, when the second fixed pattern detection circuit 16 does not detect the specific @l specific pattern signal sound inserted into the digital signal on the transmitting side, it outputs the second detection signal 1γ of "L" level. Therefore, the second selection circuit 20 receives the PCM audio signal 1 outputted from the high-efficiency audio decoding circuit 14 by inputting this "L" level 1Ic2 detection signal 17.
Select 5 and output. In this way, in the receiving section 22, r
When the second detection signal IT at HJ level is not output, that is, when the specific first fixed pattern signal sound inserted in the digital signal on the transmitting side is detected, the specific second fixed PCM is detected.
When the pattern signal 19 is output and the second detection signal 17 at "L" level is output, that is, when the specific first fixed pattern signal sound inserted on the transmitting side in the digital signal is not detected, K is a high-efficiency decoder. It is possible to output a PCM audio signal sound, which is a converted signal.

〔Effect of the invention〕

As explained above in detail, 1. According to the high-efficiency speech encoding device according to the present invention 1111, a fixed pattern of a PCM code is detected on the transmitting side, and the presence or absence of that signal is transmitted based on the presence or absence of a digital signal of a specific pattern. , on the receiving side, detects a specific pattern of digital signal sound and determines the presence or absence of that signal.
In addition to outputting fixed patterns of CM codes, fixed patterns other than voice signals can be transmitted using a high-efficiency voice encoding device. Furthermore, when switching to a normal voice band signal, the high-efficiency voice encoding circuit on the transmitting side and the high-efficiency voice decoding circuit on the receiving side are both reset. This has the advantage that the initial states of the encoding circuits match, and it is possible to quickly shift to the original encoding/decoding operation.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a high-efficiency speech encoding device according to the present invention. 3... High efficiency speech encoding circuit, 5... First fixed pattern detection circuit, T... First fixed pattern generation circuit, 9... First selection circuit, 11... φ・Transmission part, 1
4. Firefly...High efficiency audio decoding circuit, 16... Second fixed pattern detection circuit, 18... Second fixed pattern generation circuit, 20... Second selection circuit, 22... Fist e receiving section.

Claims (1)

[Claims] It has means for converting a PCM audio signal in the audio band into a highly efficient encoded digital signal and outputting the same, and means for detecting a specific fixed pattern in the PCM audio signal and transmitting the signal as a digital signal with a specific pattern. Communication Department and
It is equipped with a receiving section having means for decoding the digital signal sound sent from the transmitting section into a PCM audio signal, and means for detecting a digital signal of a specific pattern and outputting the signal in a fixed pattern of PCM code. A high-efficiency speech encoding device characterized by being capable of high-efficiency speech encoding and transmission of fixed patterns other than signals.