JPH0242267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a telephone device, primarily of the electronic button type, with a built-in speaker.

Conventional configuration and its problems Electronic button type telephone devices are generally known that have a built-in speaker and are configured to emit ring tones, call tones, etc. from the speaker, but none of these types of devices , a call signal, etc. is simply applied to the speaker via a variable resistor for adjusting the volume, and there is a problem that when the volume is lowered, the call sound becomes extremely unclear.

OBJECT OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and provides an excellent telephone device with a simple configuration in which the intelligibility of both the ring tone and the call tone hardly deteriorates even when the volume is reduced. The purpose is to

Structure of the Invention The present invention inserts a high-pass filter in parallel with a volume adjustment variable resistor that adjusts the volume from a built-in speaker, so that even when the volume is reduced, the high frequency range of the call signal is sufficiently applied to the speaker. It is designed to provide sufficient clarity.

DESCRIPTION OF EMBODIMENTS The figure is a schematic electrical connection diagram of an embodiment of the telephone device of the present invention, in which 1 is a main device connected to the central office line L, and 2 is a communication path provided in the main device 1. Switching circuit 3 is a normal circuit connected to call path switching circuit 2.
An incoming signal generation circuit that generates an incoming signal of 400 to 700 Hz, 4 a telephone connected to the main device 1, 5 a hybrid circuit provided in the telephone 4, 6 and 7 a receiver each connected to the hybrid circuit 5. and a changeover switch, 8 is a receiver connected to one fixed terminal a side of the changeover switch 7, 9 is a variable resistor for volume adjustment connected to the other fixed terminal b side of the changeover switch 7, and 10 is a variable resistor. A high pass filter consisting of a resistor R ₁ and a capacitor C is connected in parallel to the filter 9, 11 is an amplifier circuit, and 12 is a speaker.

The changeover switch 7 is normally connected to one fixed terminal b side, and by lifting the handset containing the transmitter 6 and handset 8, it is automatically connected to the other fixed terminal a side. It is configured. Even when the handset is lifted, the changeover switch 7 can be switched to one of the fixed terminals b by manual operation.

In the above embodiment, when there is an incoming call on the office line L, this is detected by the incoming call detection circuit (not shown), and the incoming call signal generation circuit 3 outputs an incoming call signal of 400 to 700 Hz. This signal is then applied to the speaker 12 via the communication path switching circuit 2, the hybrid circuit 5, the changeover switch 7, the variable resistor 9 for volume adjustment, the high pass filter 10, and the amplifier circuit 11. When the incoming call is detected by the ringing tone from the speaker 12 and the handset is lifted, this is detected within the main device 1 and a communication path is established. In this state, selector switch 7
is inserted into the fixed terminal a side, so the above telephone 4
This will enable you to make a call. In a state where a call is possible, that is, a call state, the changeover switch 7
When connected to the fixed terminal b side, the call signal from the other party can be applied to the speaker 12 via the variable resistor 9 for adjusting the volume, the high-pass filter 10, and the amplifier circuit 11. You can enlarge and listen to the call sound.

By the way, according to the embodiment described above, since the high-pass filter 10 is inserted in parallel with the volume adjustment variable resistor 9 that adjusts the volume of the ring tone, call tone, etc., even if the volume is reduced, the incoming call signal and the call signal are not affected. Since the high-frequency components of the above are sufficiently applied to the speaker 12, the clarity of the incoming signal and the conversation signal can be sufficiently guaranteed. According to the above embodiment, when the volume is increased, the high pass filter 10
This method has the advantage that good clarity can be obtained as in the conventional method, and high-frequency noise is hardly emphasized.
In other words, when the high-pass filter 10 is inserted in series with the variable resistor 9 for adjusting the volume, when the volume is increased, the high-frequency range is greatly emphasized in the same way as when the volume is decreased, so that noise due to the high-frequency range is reduced. However, according to the above embodiment, since the high-pass filter 10 is inserted in parallel with the variable resistor 9, such inconvenience hardly occurs, and good sound quality can always be achieved. It has the advantage that it can be obtained.

Effects of the Invention As is clear from the above embodiments, the present invention is configured such that a high-pass filter is inserted in parallel with the variable resistor for adjusting the volume. Therefore, according to the present invention, when the volume is increased, Good clarity can be obtained both when the volume is reduced, and this is extremely advantageous in practice. Furthermore, the present invention has the advantage that it can be constructed by simply adding a high-pass filter, the overall construction does not become complicated, and it can be constructed relatively inexpensively.

[Brief explanation of drawings]

The figure is a schematic electrical connection diagram of one embodiment of the telephone device of the present invention. 1... Main device, 2... Call path switching circuit, 3...
Incoming signal generation circuit, 4... telephone, 5... hybrid circuit, 6... transmitter, 7... selector switch, 8... telephone receiver, 9... variable resistor for volume adjustment, 10... high pass filter, 11 ...Amplifier, 12...Speaker.

Claims (1)

[Claims] 1 A built-in speaker is configured to supply an incoming call signal, a call signal, etc. via a variable resistor for volume adjustment, and to emit a ring tone, a call sound, etc. from the speaker, and the variable resistor for volume adjustment is A telephone device consisting of a high-pass filter connected in parallel to a receiver.