JPH04354238A - Telephone set with speaker phone - Google Patents

Abstract

PURPOSE:To prevent talking from being affected by a surrounding noise level when in use by providing a changeover means selecting the state of the speaker phone to the transmission state or the reception state to the telephone set. CONSTITUTION:When the talking state is switched and a control switch 6 of a switching section drive circuit 5 is turned on, a control signal is outputted and a transmission signal position of changeover sections 3, 4 remains at the position (a) and a reception signal side of them is thrown to the position (d) and the telephone set is kept to the transmission state in which an input voice from a microphone 1 is sent through the changeover. Conversely, with the control switch 6 turned off, the transmission signal position of the changeover sections 3, 4 is thrown to the position (b) and the reception signal side of them is thrown to the position (c) and the telephone set is kept to the reception state in which the received voice is outputted from a speaker 2. Then the telephone set is set to either the transmission state or the reception state through the series of operation as above and talking is implemented through a line 14 via a line interface circuit 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device with a speaker horn that can be switched between a transmitting state and a receiving state.

0002

2. Description of the Related Art The prior art will be explained with reference to FIG. The audio signal received by the line interface circuit 11 is output to the speaker 2 via the amplifier circuit 9 since the switch is placed at the output terminal (3) on the speaker 2 side. The output of the amplifier circuit 9 is applied to one input of a comparator 22 via a level adjustment circuit 20 including a level adjustment and delay function.

On the other hand, an input signal from the microphone 1 is applied to an input terminal (2) via an amplifier circuit 8. The input signal is also applied to the other input of the comparator 22 via the level adjustment circuit 21. The comparator 22 compares the input signal from the microphone 1 and the output signal to the speaker 2, and the signal resulting from the comparison switches the transmitting signal/receiving signal switching circuit 10 to a larger input side via a delay circuit. That is, conventional speaker horns are configured to switch to a state with a higher level.

0004

[Problem to be Solved by the Invention] However, when using a speaker horn, the transmitting state and the receiving state are switched depending on the magnitude of the signal level.
There are the following drawbacks.

[0005] Noise is added to the outgoing signal by picking up noise around the telephone during use, and the overall level of the outgoing signal becomes high. For this reason, the transmitting state may continue even if the transmitting signal disappears, or conversely, the receiving signal may be affected by noise or line noise from the other party, causing the receiving state to continue, resulting in poor communication. There is.

[0006]

[Means for Solving the Problems] The present invention provides a speaker horn equipped with a means for energizing the speaker horn to a transmitting state or a receiving state according to an operator's selection, and for holding this state. Provide telephone equipment.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a telephone device with a speaker horn according to the present invention. 1 is a microphone for inputting a transmission signal; 2 is a speaker for outputting a reception signal as a volume; 3 and 4 are switching units;
Reference numeral 5 denotes a switching section drive circuit that drives the switching sections 3 and 4. Reference numeral 6 represents a control switch for controlling the switching section drive circuit 5. Reference numeral 7 denotes a start switch that enables the switching section drive circuit 5 to operate. Reference numeral 8 represents an amplification circuit for transmitting signals, and reference numeral 9 represents an amplification circuit for receiving signals.

10 is a transmit signal/receive signal switching circuit used when using a normal speaker horn, 11 is a line interface, 12 is a dial circuit for generating a dial signal, 13 is a handset section, 14 is a telephone line, 15
is the power supply section.

Next, the operation will be explained. First, a transmission signal is input from the microphone 1. Normally, the a side is selected in the switching section 3, and the c side is selected in the switching section 4. The transmitting signal is amplified by the amplifier circuit 8 and input to the transmitting signal/receiving signal switching circuit 10 . The transmit signal/receive signal switching circuit 10 operates to compare the levels of the transmit signal from the amplifier circuit 8 and the receive signal output from the switching section 4 and to switch to the higher level.

On the other hand, a receive signal is input to the amplifier circuit 9 when the transmit signal/receive signal switching circuit 10 switches to the receive state. Then, the amplification circuit 9 amplifies the signal to drive the speaker 2.

Next, an operation for arbitrarily switching the call state in one direction will be explained. The switching unit drive circuit 5 is activated by turning on the activation switch 7. Then, when the control switch 6 is turned on, a control signal is outputted from the switching section drive circuit 5 so that in the switching sections 3 and 4, the transmitting signal side is switched to the a side and the receiving signal side is switched to the d side. By this switching, the speaker horn is maintained in a transmitting state in which the input voice from the microphone 1 is sent out.

Conversely, when the control switch 6 is turned from the on state to the off state, the switching section driving circuit 5 controls the switching sections 3 and 4 so that the transmitting signal side is switched to the b side and the receiving signal side is switched to the c side. A signal is output. The speaker horn is held in a receiving state in which the received sound is output from the speaker 2.

Through these series of operations, the telephone is maintained in either the transmitting state or the receiving state, and a telephone call is made via the line 14 via the line interface circuit 11. Line interface 11 also performs 4-wire to 2-wire conversion and converts the input and output of line 14 to the appropriate levels. Reference numeral 12 represents a dial circuit, and reference numeral 13 represents a handset unit, which is used during normal calls without using a speaker horn. Reference numeral 15 is a power supply that supplies power to each part.

[0014]

[Other Embodiments] In the above embodiments, the switching section 3,
4 as a switch, for example, by using electronic volumes 30, 40 with a mute function in the switching units 4, 5, the call signal level can be switched in multiple stages, and the transmitting state and It is also conceivable to arbitrarily switch and maintain the receiving state.

The operation of this other embodiment will be briefly explained. The switching unit drive circuit 5 is activated by turning on the activation switch 7. Then, when the control switch 6 is turned on, the electronic volume 40 lowers the signal level from the line interface circuit 11 on the receiving signal side to be lower than the input level from the microphone 1, and as a result, the transmitting signal/receiving signal is switched. The circuit 10 is maintained in a transmitting state in which the input voice from the microphone 1 is sent out.

Conversely, when the control switch 6 is turned from the on state to the off state, the signal level from the microphone 1 on the transmission signal side is lowered in the electronic volume 30 than the signal level from the line interface circuit 11, and as a result, , the transmitting signal/receiving signal switching circuit 10 is maintained in a receiving state in which the received voice is output from the speaker 2.

[0017]

[Effects of the Invention] As described above, the present invention allows the user to switch and hold the transmitting state and the receiving state at will according to the user's instructions, so the user can talk to the caller like a transceiver. This has the advantage of preventing involuntary switching of the transmitting/receiving state due to the influence of ambient noise, line noise, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the invention.

FIG. 3 is a block diagram showing the prior art.

[Explanation of symbols]

1... Microphone, 2... Speaker, 3 Switching section, 4
...Switching unit, 5...Switching unit drive circuit, 6...Status changeover switch, 7...Start switch, 8...Amplification circuit, 9...
Amplifier circuit, 10... Sending/receiving switching circuit, 11... Line interface, 12... Dial circuit, 13... Handset section, 14... Line, 15... Power supply section 30, 40... Electronic volume with mute function

Claims (1)

[Claims] 1. A telephone device with a speaker horn, comprising means for energizing the speaker horn to a transmitting state or a receiving state according to an operator's selection, and for holding this state.