JP2766383B2 - Voice switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a voice switch, and more particularly to a voice switch provided with a peak hold unit.

[Prior Art] As shown in FIG. 3, usually, a loudspeaker terminal TE ₂ is provided with a microphone 21, an up voice switch 22, an up voice signal detection circuit 2
3, down voice signal detection circuit 24, down voice switch 25,
It comprises a speaker 26 and a CPU 27. The CPU 27 has a built-in voice switch switching determination program.

Uplink speech signal f ₁ or downlink line is outputted from the microphone 21
L ₂ downlink voice signal f ₂ received via the terminal T ₄ from upstream, respectively, are detected by the downlink voice signal detection circuit 23, to be received one audio signal, for example downlink voice signal f ₂ CP
U27 voice switch change determination program is started with a built-in, and close the upstream voice switch 22, via a terminal T ₃ to the uplink line L ₁ transmits an uplink voice signal f _1.

When the upstream and downstream audio signals f ₁ and f ₂ are simultaneously transmitted and detected by the downstream audio signal detection circuits 23 and 24, one of the upstream and downstream voice switches 22 and 25 is closed according to the level of the detected audio signal. To achieve. In this way, it is possible to prevent call failure due to the sound.

Up [Invention Problem to be Solved] In a voice switch provided in the loudspeaker telephone terminal TE _2, if there is starting from a small consonant energy into words downlink voice signal f _1, f _2, uplink, downlink The audio signal detection circuits 23 and 24 may not operate.

Also, the upstream and downstream audio signal detection circuits 23 and 24 operate,
The processing time from when the voice switch changeover judgment program built in the CPU 27 is activated to when either the up voice switch 22 or the down voice switch 22 is operated becomes a time that cannot be ignored for the sense of hearing. There is a disadvantage that the phenomenon occurs.

[Object of the Invention] The present invention has been made in view of the above-mentioned difficulties,
A word which starts with a consonant by providing an up / down audio signal peak hold means for holding the peak value of the down audio signal, and replacing the up / down audio signal peak hold means with a peak hold value detected at a predetermined time. Voice switch that can prevent the malfunction of the up and down voice signal detection means of weak voice signal envelope such as etc. and can reliably prevent the break of the head by temporarily storing the upstream and downstream voice signals in the upstream and downstream FIFO memory. The purpose is to provide.

Means for Solving the Problems In order to achieve the above object, a voice switch according to the present invention includes an upstream audio signal detection unit for detecting an upstream audio signal from a microphone and a downstream audio signal detection unit for detecting a downstream audio signal. And upstream and downstream FIFO memories for storing upstream and downstream audio signals and outputting delayed upstream and downstream audio signals,
Ascending and descending audio signals detected by the upstream and downstream audio signal peak hold means, which hold the peak value of the uplink and downlink audio signals and are initialized after a predetermined elapsed time, and are detected before the predetermined elapsed time. The peak value of the upstream and downstream audio signals is held, and the upstream and downstream audio signal peak hold units for initializing the upstream and downstream audio signal peak holding units are initialized at the held peak value, and stored in the upstream FIFO memory. Uplink to connect the upstream voice signal to the upstream line and the downstream voice signal input from the downstream line to the speaker,
Downstream audio switching means, and the output side of the upstream and downstream audio signal peak hold means are respectively connected, and the initialization upstream and downstream audio signal peak hold means are controlled by the initialization peak hold circuit activation timing program,
A CPU for controlling an up / down audio switching means by an up / down audio signal determination program.

[Embodiment] An embodiment of the voice switch of the present invention will be described below with reference to FIG.
This will be described in detail with reference to FIG.

A loudspeaker TE ₁ to which the voice switch of the present invention is applied.
1, a microphone 1, an upstream FIFO memory 2, an upstream voice switch 3, formed by normally open contacts, an upstream audio signal detection circuit 4, an upstream audio signal peak hold circuit 5, an initialization upstream audio signal peak A hold circuit 6, a down FIFO memory 7, a down voice switch 8 formed by normally closed contacts,
It comprises a speaker 9, a downstream audio signal detection circuit 10, a downstream audio signal peak hold circuit 11, an initialization audio signal peak hold circuit 12, and a CPU 13. The CPU 13 incorporates an up / down audio signal determination program and an initialization peak hold circuit activation timing program.

The output side of the microphone 1 is connected to the upstream FIFO memory 2 and the input side of the upstream audio signal detection circuit 4, respectively. The upstream audio signal f ₁ generated by the microphone 1 is temporarily stored in the upstream FIFO memory 2 and sent to the upstream audio signal detection circuit 4.
Further, the output side of the upstream FIFO memory 2 is connected upstream, the terminal T ₁ via an uplink voice switch 3 operated by the determination of the downlink speech signal determination program provided in CPU 13.

The output side of the upstream voice signal detection circuit 4 is connected to the input side of the upstream voice signal peak hold circuit 5 and the initialization upstream voice signal peak hold circuit 6. The upstream voice signal f ₁ detected by the upstream voice signal detection circuit 4 is sent to the upstream voice signal peak hold circuit 5. Uplink speech signal peak-hold circuit 5 uplink speech signals f ₁ peak value determination techniques peak for initialization provided CPU13 when held by the hold circuit start timing by voice envelope level of the peak value is known in the art The program is executed. The initialization peak hold circuit activation timing program includes an initialization time t ₁ from the peak hold of the upstream and downstream audio signal peak hold circuits 5 and 11 until the initialization, and
Counting slightly and initialization preparation time t ₂ from the previous time point to the end-of-count the time from the counting at the end of the initialization time t _1. Up at the time of the start of the initialization preparation time t ₂ to count end of initialization preparation time t _2, the uplink detected in downlink voice signal detection circuit 4, 10, downlink voice signal f _1, f ₂ of the peak value Are held by the initialization up / down audio signal peak hold circuits 6 and 12, and the held peak value is the initialization preparation time t ₂
At the end of the counting, the initial values of the upstream and downstream audio signal peak hold circuits 5 and 11 are set. The initialization peak hold circuit activation timing program is activated separately from the time, i.e. up to the subsequent counting end of initialization preparation time t ₂ monitors the magnitude of the uplink, downlink voice signal f _1, f ₂ of the peak value , the magnitude of the initialized initialized peak value of the uplink speech signals f ₁ of downlink voice peak value of the signal f ₂ and uplink speech signal peak-hold circuit 5 of the downlink voice signal peak-hold circuit 11 by downlink voice signal judging program Is determined, the up voice switch 3 is closed and the down voice switch 8 is closed as soon as the peak value of the up voice signal is large. When uplink voice switch 3 is closed the output side of the upstream FIFO memory 2 uplink voice switch 3 is closed, it is connected to the upstream line L ₁ through the terminal T _1. Uplink speech signals f ₁ to the output side of the upstream FIFO memory 2 is stored when it is connected to the upstream line L ₁ in the uplink FIFO memory 2 is sent to the uplink line L _1, the uplink FI
The above determination processing is performed within the delay time stored in the FO memory 2.

The terminal T ₂ to which the downstream line L ₂ is connected is connected to the downstream FIFO memory 7 and the input side of the downstream audio signal detection circuit, respectively, and the output side of the downstream FIFO memory 7 is provided for the upstream, downstream and audio signal determination provided in the CPU 13. It is connected to the speaker 9 via the down voice switch 8 which is closed by the judgment of the program.

The output side of the downstream voice signal detection circuit 10 is connected to the input side of the downstream voice signal peak hold circuit 11 and the input side of the initialization downstream voice signal peak hold circuit 12, respectively.

The output side of the downstream audio signal peak hold circuit 11 is the CPU 13
Connected to the initialization downstream audio signal peak hold circuit
12 initializes the downlink voice signal peak-hold circuit 11 at the peak value of the timing end of the initialization preparation time t ₂ of the peak hold circuit start timing program initialization provided CPU 13.

[Operation of the Invention] In the voice switch thus configured, the second
At the time shown in the figure, for example, the peak value V of the audio signal envelope VS ₁ of the uplink audio signal f ₁ detected by the uplink audio signal detection circuit 4
H ₁ is held by the peak for initialization provided CPU13 hold circuit activation timing program in the uplink speech signal peak-hold circuit 5 is activated. Initializing the peak hold circuit activation timing program counts the initialization preparation time t ₂ from the point when you start up initialization time t ₁ and the dots to the point. Uplink speech signal peak-hold circuit 5 even if the level of the uplink speech signals f ₁ becomes 0 at a point in the timing is as one likes that holds the peak value VH _1. For this reason, even if the downstream voice signal f ₂ is input to the terminal T ₂ at this point, the downstream voice switch 8 remains open, and therefore, even if the downstream voice signal f ₂ is output from the downstream FIFO memory 7, The down sound signal f ₂ is output from the microphone 9 and the sound does not enter the sound state due to the sneaking into the microphone 1. ,
,, speech signal envelope since initialization preparation time t ₂ at the time of the elapsed time to reach the point transitions to VS ₄ ~VS _5.
As a result, the initialization upstream audio signal peak hold circuit 6
The peak value is changed VH ₃ ~VH _4, the initialization period t ₁ for initializing the uplink speech signal peak at the time is completed hold circuit 6
Peak value VH ₄ of the initial value of the uplink speech signal peak-hold circuit 5. The up and down voice signal determination program which is started up separately from the initialization peak hold circuit startup timing program determines the magnitude of the peak value of the up and down voice signals f ₁ and f ₂ , and in this determination the up voice signal f _If the peak value of ₁ is large, the voice switch 3 is closed, but the processing time until the up voice switch 3 is closed is shorter than the time when the audio signal f ₁ is stored in the up FIFO memory 2, so No cutting phenomenon occurs.

Further, even if the downlink voice signal f ₂ is detected by the downlink voice signal detection circuit 10 operates in the same manner as that described above in relation to the uplink speech signal f _1.

If the initial values of the upstream and downstream audio peak hold circuits 5 and 10 are fixed without providing the initialization upstream and downstream audio signal peak hold circuits 6 and 12, the operation becomes unstable. In the above embodiment, the up line may be the terminal and the down line may be the network side. The voice switch in the above embodiment may be used for a BOX of a wireless telephone. The voice switch in the above embodiment may be used for an intercom, a loudspeaker trunk of a PBX, or the like.

[Effects of the Invention] As is apparent from the above description, according to the voice switch of the present invention, it is possible to prevent a malfunction due to a weak voice spectrum of a word or the like starting with a consonant and a head break due to a processing time for operating the voice switch. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a voice switch according to the present invention, FIG. 2 is a time chart relating to FIG. 1, and FIG. 3 is a block diagram of a conventional voice switch. DESCRIPTION OF SYMBOLS 1 ... Microphone 2 ... Upstream FIFO memory 3 ... Upstream voice switch (upstream audio switching means) 4 ... Upstream audio signal detection circuit (unit) 5 ... Upstream audio signal peak hold circuit (unit) 6 ... Initialization Upward audio signal peak hold circuit (means) 7 Downstream FIFO memory 8 Downstream voice switch (downstream audio switching means) 10 Downstream audio signal detection circuit (means) 11 Downstream audio signal peak hold circuit (means) ) 12 ...... initializing downlink audio signal peak-hold circuit (means) 13 ...... CPU f ₁ ...... uplink speech signal f ₂ ...... downlink speech signal t ₁ ...... elapsed time predetermined

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H04M 9/00-9/10 H04M 1/60 H04B 3/00-3/44 H04B 3/50-3/60 H04B 7 / 005-7/015

Claims (1)

(57) [Claims] 1. A uplink speech signal uplink speech signal detecting means (f ₁₎ detecting the (4) as well as downlink voice signal detection means for detecting the downlink voice signal (f ₂₎ from the microphone (1) and (10), The uplink and downlink FIFO memories (2, 7) for storing the uplink and downlink audio signals and outputting the delayed uplink and downlink audio signals, and storing the peak values of the uplink and downlink audio signals detected in the uplink and downlink audio signals. An up / down audio signal peak hold means (5, 11) which is held and initialized after a predetermined elapsed time (t ₁ ); and a peak of the up / down audio signal detected before the predetermined elapse time. And an initializing up / down audio signal peak hold unit (6, 12) for initializing the up / down audio signal peak hold unit with the held peak value, and an uplink stored in the up FIFO memory. Audio signal To upstream line (L _1), the down line upstream connecting a downlink voice signal input from the (L ₂₎ to the speaker (9), downlink voice switching means (3,8)
And the output sides of the upstream and downstream audio signal peak hold means are respectively connected, and the initialization upstream and downstream audio signal peak hold means are controlled by an initialization peak hold circuit activation timing program, and the upstream and downstream audio signal determination programs And a CPU (13) for controlling the upstream and downstream voice switching means.