JP2007020052A - Telephone terminal of key telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telephone terminal of a key telephone system by which a call between a handset and a speaker microphone by voice channels 1 and 2 is dynamically switched without increasing circuit scale. <P>SOLUTION: The telephone terminal 10 has a transmission circuit 11 connected to a main controller and a voice channel control circuit 12 which connects the voice channels 1, 2 to the handset 13 and the speaker microphone 14. The channel control circuit 12 switches the call between the handset and the speaker microphone by each of the voice channels 1, 2 to a call between the handset and the speaker microphone by each of the voice channels 2, 1 by space division or time division when channel switching is instructed by a channel switching signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a button telephone apparatus that transmits and receives voice data to and from a main controller using two channels as voice information channels, and in particular, by switching input / output of the voice information channel, the circuit of the key telephone terminal can be reduced. The present invention relates to a telephone terminal of a key telephone apparatus.

  A configuration example of a conventional key telephone terminal will be described with reference to FIG. The key telephone terminal performs uplink / downlink transmission of the voice channel 1 and the voice channel 2 with a main controller (not shown) by the transmission circuit 51.

  When the voice channel 1 is assigned to a telephone call using a handset and the voice channel 2 is assigned to a telephone call using a speaker and a microphone (hereinafter referred to as a microphone), the connection is as follows. That is, the PCM data of the voice channel 1 input / output to / from the transmission circuit 51 is connected to the handset 53 through the PCM encoding / decoding circuit 52 and the upstream / downstream amplifier (AMP). On the other hand, the PCM data of the voice channel 2 is connected to a speaker 57 and a microphone 58 via a signal processing circuit 55, a PCM encoding / decoding circuit 56, and an upstream / downstream amplifier (AMP). Here, the signal processing circuit 55 is a circuit for eliminating echo generated by the speaker 57 and the microphone 58.

In addition, there exists the following patent document 1 as a patent document which disclosed the prior art relevant to this invention.
Japanese Patent Laid-Open No. 11-262041

  In the conventional button telephone apparatus described above, when the conversation between the handset 53 and the speaker / microphone by the voice channel 1 and the voice channel 2 is dynamically switched, the transmission between the transmission circuit 51 and the PCM encoding / decoding circuit 52 is performed. However, it is necessary to connect a signal processing circuit for canceling the echo, and there is a problem that the circuit scale increases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a button telephone device that can dynamically switch between a handset and a speaker / microphone using the voice channel 1 and the voice channel 2 without solving the problems of the prior art and increasing the circuit scale. To provide a telephone terminal.

  In order to achieve the above-described object, the present invention provides the voice data of the voice channels 1 and 2 in the telephone terminal of the key telephone device that transmits and receives voice data to and from the main controller using two channels as voice channels. A voice channel control circuit selectively connected to the handset and the speaker / microphone is provided, and the voice channel control circuit switches between the handset / speaker / microphone calls by the voice channels 1 and 2. There is one feature.

  Further, according to the present invention, when the channel switching signal is instructed by the channel switching signal, the voice channel control circuit performs a call between the handset and the speaker / microphone through the voice channels 1 and 2, respectively. There is a second feature in that it is switched to a telephone / speaker / microphone call.

  Further, according to the present invention, the audio channels 1 and 2 are selectively connected to the handset and a speaker / microphone in accordance with the audio channel synchronization signals 1 and 2, and the audio channel control circuit performs channel switching by a channel switching signal. When instructed, the third feature is that the correspondence relationship between the audio channels 1 and 2 and the audio channel synchronization signals 1 and 2 is switched in reverse.

  According to the present invention, there is an effect that switching between a handset and a speaker / microphone can be switched by the audio channel 1 and the audio channel 2 without increasing the circuit scale.

  In addition, there is an effect that the switching of the call can be performed only by the processing of the telephone terminal of the key telephone device, in other words, without imposing any burden on the main control device.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the main controller.

  Main controller 1 transmits / receives audio information channel 1, audio information channel 2, and control information to / from telephone terminal 10 via synchronization circuit 2. The voice information can be exchanged and connected between the telephone terminals and the office line circuit 5 under the control of the voice channel exchange switch 4 from the central processing unit 3. On the other hand, the control information of the telephone terminal 10 is transmitted and received by the central processing unit 3 by writing to and reading from the control information memory 6.

  Next, an embodiment of the configuration of the telephone terminal 10 will be described. FIG. 2 is a block diagram showing the overall configuration of the telephone terminal 10, and FIGS. 3 and 4 are block diagrams showing specific configurations of the transmission circuit 11 and the voice channel control circuit 12 in the telephone terminal 10, respectively. In FIG. 2, the same reference numerals are given to some of the same components as in FIG.

  As shown in FIG. 2, the telephone terminal 10 includes a transmission circuit 11 and a voice channel control circuit 12. The telephone terminal 10 performs uplink / downlink transmission of the voice channel 1 and voice channel 2 with the main control device 1 by the transmission circuit 11. As for the PCM data of the uplink / downlink audio channel 1 and audio channel 2, the audio channel control circuit 12 selects either the circuit of the handset 13 or the circuit of the speaker / microphone 14.

  As shown in FIG. 3, the transmission circuit 11 includes a synchronization circuit 21, audio channel memories 22 and 23, and a control information memory 24. The synchronization circuit 21 writes / reads data to be transmitted / received to / from the audio channel memory 1 (22) and the audio channel memory 2 (23) synchronously. The synchronization circuit 21 outputs audio channel synchronization signals 1 and 2. These audio channel synchronization signals 1 and 2 will be described later.

  As shown in FIG. 4, the audio channel control circuit 12 includes an audio channel 1 reception data buffer memory 31, an audio channel 1 transmission data buffer memory 32, an audio channel 2 reception data buffer memory 33, and audio channel 2 transmission data. The buffer memory 34 and the channel switching unit 35 are included. The voice channel control circuit 12 stores the uplink / downlink voice channel 1 and voice channel 2 PCM data in the transmission / reception buffer memories 31 to 34, and the channel switching unit 35 causes the PCM data input / output 1 or PCM data to be stored. Either data input / output 2 can be selected and input / output.

  Next, the operation of the present embodiment will be described with reference to FIGS. When a call is made by the handset 13 in the voice channel 1 of FIG. 4 and a call is made by the speaker / microphone in the voice channel 2, the channel switching signal is generated by a selection signal of a selection switch (not shown) operated by the user, for example. The channel switching unit 35 is connected to the L (low) level as shown in FIG. 4 or as shown in FIG. That is, each of PCM data output 1 and PCM data input 1 is connected with downlink channel 1 and uplink channel 1, and each of PCM data output 2 and PCM data input 2 is connected with downlink channel 2 and uplink channel 2. Is done.

  Next, when the voice channel 1 is used to make a call using the speaker / microphone 14 and the voice channel 2 is used to dynamically change the call using the handset 13, the channel is determined by the selection signal of the selection switch operated by the user. The switching signal is set to, for example, an H (high) level, and the channel switching unit 35 is connected to a contact opposite to that in FIG. That is, the PCM data output 1 and the PCM data input 1 are connected to the downlink channel 2 and the uplink channel 2, respectively, and the PCM data output 2 and the PCM data input 2 are connected to the downlink channel 1 and the uplink channel 1, respectively. Is done.

  As a result, the data of the audio channel 1 once stored in the audio channel 1 reception data buffer memory 31 and the audio channel 1 transmission data buffer memory 32 is connected to the speaker / microphone 14, while the audio channel 2 reception data buffer memory 33. The voice channel 2 data once stored in the voice channel 2 transmission data buffer memory 34 is connected to the handset 13.

  As described above, according to the present embodiment, even when the call between the handset 13 and the speaker / microphone 14 by the voice channels 1 and 2 is dynamically switched, the signal for always canceling the echo in the call of the speaker / microphone 14. Since the processing circuit is connected, it is not necessary to add the signal processing circuit.

  Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment differs from the first embodiment in that the first embodiment spatially divides the audio channels 1 and 2, whereas the second embodiment time-divides. In FIG. 6, the same reference numerals are given to some parts equivalent to those in FIGS. 2 and 8.

  FIG. 6 is a block diagram showing the configuration of the telephone terminal 10 of the present embodiment. The voice channel control circuit 41 includes the channel switching signal and voice channel synchronization signals 1, 2 output from the synchronization circuit 21 of FIG. Is entered. As shown in FIGS. 6 and 7, the audio channel control circuit 41 receives the downlink audio channel 1, the uplink audio channel 1, the downlink audio channel 2 and the uplink as shown in FIGS. Audio channel 2 is connected. The PCM encoding / decoding circuit 42 is enabled only while the audio channel synchronization signal 1 is at H level, while the PCM encoding / decoding circuit 43 is enabled only while the audio channel synchronization signal 2 is at H level. .

  Next, the operation will be described. When a call is made by the handset 13 on the voice channel 1 in FIG. 6 and a call is made by the speaker / microphone on the voice channel 2, a selection switch (not shown) operated by the user is displayed. The channel switching signal is set to L (low) level by the selection signal, for example. Then, while the audio channel synchronization signal 1 is at the H level, the downlink channel 1 and the uplink channel 1 are connected to the PCM data output and the PCM data input, respectively, the PCM encoding / decoding circuit 42 is enabled, and the PCM encoding / decoding circuit 42 is enabled. Since the decoding circuit 43 is disabled, it is connected to the handset 13. On the other hand, while the audio channel synchronization signal 2 is at the H level, the downlink channel 2 and the uplink channel 2 are connected to the PCM data output and the PCM data input, respectively, the PCM encoding / decoding circuit 42 is disabled, and the PCM encoding is performed. Since the decoding circuit 43 is enabled, it is connected to the speaker / microphone 14.

  Next, when the voice is switched dynamically so that a call is made by the speaker / microphone 14 in the voice channel 1 and a call is made by the handset 13 in the voice channel 2, the channel is switched by the selection signal of the selection switch operated by the user. For example, the signal is set to the H (high) level. Then, while the audio channel synchronization signal 1 is at the H level, the downlink channel 2 and the uplink channel 2 are connected to the PCM data output and the PCM data input, respectively, the PCM encoding / decoding circuit 42 is enabled, and the PCM encoding / decoding circuit 42 is enabled. Since the decoding circuit 43 is disabled, the downlink channel 2 and the uplink channel 2 are connected to the handset 13. On the other hand, while the audio channel synchronization signal 2 is at the H level, the downlink channel 1 and the uplink channel 1 are connected to the PCM data output and the PCM data input, respectively, the PCM encoding / decoding circuit 42 is disabled, and the PCM encoding is performed. Since the decoding circuit 43 is enabled, the downstream channel 1 and the upstream channel 1 are connected to the speaker / microphone 14.

  As described above, the data of the audio channel 1 is connected to the speaker / microphone 14, while the data of the audio channel 2 is connected to the handset 13. 2, even if the conversation between the handset 13 and the speaker / microphone 14 is dynamically switched, a signal processing circuit for always canceling the echo is connected to the speech circuit of the speaker / microphone 14. There is no need to add more.

  Further, according to the present invention, on the main control device side, the voice channels 1 and 2 of the telephone terminal do not need to be switched depending on whether the call is made by a handset or by a speaker / microphone, in other words, The voice channels 1 and 2 can be switched to a telephone call using a handset or a speaker / microphone without any burden on the main control unit.

It is a block diagram which shows the schematic structure of the main control apparatus of a button telephone apparatus. It is a block diagram which shows the structure of the telephone terminal of 1st Embodiment of this invention. FIG. 3 is a block diagram illustrating a schematic configuration of a transmission circuit 11 in FIG. 2. FIG. 3 is a block diagram showing a schematic configuration of a voice channel control circuit of FIG. 2. It is a figure explaining operation | movement of an audio | voice channel control circuit. It is a block diagram which shows the structure of the telephone terminal of 2nd Embodiment of this invention. It is a figure explaining operation | movement of an audio | voice channel control circuit. It is a block diagram which shows the structure of the conventional telephone terminal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main controller, 10 ... Telephone terminal, 11 ... Transmission circuit, 12, 41 ... Voice channel control circuit, 13 ... Handset, 14 ... Speaker / microphone 55 ... Signal processing circuit.

Claims (4)

In a telephone terminal of a button telephone device that transmits and receives audio data to and from the main controller using two channels as audio channels,
A voice channel control circuit for selectively connecting voice data of voice channels 1 and 2 to a handset and a speaker / microphone;
The telephone terminal of the key telephone apparatus, wherein the voice channel control circuit switches a call between the handset and the speaker / microphone by the voice channels 1 and 2. In the telephone terminal of the key telephone apparatus according to claim 1,
When the channel switching signal is instructed by the channel switching signal, the voice channel control circuit performs a conversation between the handset and the speaker / microphone by the voice channels 1 and 2, respectively, A telephone terminal of a key telephone device characterized by switching to a microphone call. In the telephone terminal of the key telephone apparatus according to claim 1,
The audio channels 1 and 2 are selectively connected to the handset and speaker / microphone according to audio channel synchronization signals 1 and 2,
The voice channel control circuit switches a correspondence relationship between the voice channels 1 and 2 and the voice channel synchronization signals 1 and 2 in reverse when a channel switching is instructed by a channel switching signal. Phone terminal. In the telephone terminal of the key telephone apparatus according to any one of claims 1 to 3,
A telephone terminal of a key telephone apparatus, wherein a signal processing circuit is connected only to the speaker / microphone communication circuit.

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