JP3258948B2 - Phone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone which comprises a receiver and a telephone body, and which can output a received voice from a speaker of the telephone body.

[0002]

2. Description of the Related Art FIGS. 8 to 10 show the structure of a conventional cordless telephone. The cordless telephone is composed of a base unit (1) as a telephone body and a slave unit (2) as a handset, and the slave unit (2) has a surface facing the base unit (1) as shown in FIG. It can be stored in the parent machine (1). The slave unit (2) has an elongated casing (21) as shown in FIG.
On the front side of the casing (21), a receiving section (22) with a built-in speaker is disposed at the upper end, and a transmitting section (23) with a built-in microphone is disposed at the lower end. An operation key group (24) for inputting a telephone number or the like is arranged between the receiving section (22) and the transmitting section (23). A secondary battery (25) serving as a power supply is built in at the lower end of the slave unit (2), and a pair of charging terminals (25) connected to the secondary battery (25) are provided on the bottom of the casing (21). 26) and (26) are provided.

On the other hand, the master unit (1) has a flat cabinet (11) as shown in FIG. 9, and a slave unit storage part (12) is recessed on the surface of the cabinet (11). The base unit (1) is provided with a receiving unit (14) having a built-in speaker (15) facing the center of the child unit storage unit (12), and the receiving unit (14) has a cabinet ( 1
A plurality of sound emitting holes (18) are provided on the surface of (1) for emitting a received voice. Output terminals (13) and (13) for charging the child device are arranged at the lower end of the child device housing portion (12), and the child device (2) is placed in the posture shown in FIG. ), A pair of charging terminals (26) (26) provided on the slave unit (2).
Contacts the pair of output terminals (13) and (13) provided on the parent device (1), and the child device (2) is charged. In addition, cabinet (1
As shown in FIG. 9, an operation key (16) is provided on the side of the slave unit storing section (12) on the surface of 1), and a transmitting section having a built-in microphone is provided at an end of the cabinet (11). (17) is protruded.

[0004] The above-mentioned cordless telephone uses a received voice as a base unit.
It is possible to set a speakerphone mode for emitting sound from the speaker (15) of (1). In the speakerphone mode, the slave unit (2) is emitted from the sound emission hole (18) with the handset (2) separated from the ear. You can hear the incoming voice.

[0005]

FIG. 11 shows the frequency characteristics of the received voice obtained when the speakerphone mode is set in the conventional telephone. Cordless handset
When the speakerphone mode is set in a state where (2) is lifted from the slave unit storage part (12) of the master unit (1), the reception sound emitted from the speaker (15) has no obstacle in its course. Therefore, as shown by the solid line in the figure, the sound is transmitted to the ear of the listener at a sufficient sound pressure level from the low band to the high band. Therefore, the received voice heard by the listener is clear.

On the other hand, when the speakerphone mode is set in a state in which the slave unit (2) is stored in the slave unit storage section (12) of the master unit (1), the slave unit (2) is set to a plurality of mobile units. Since the sound hole (18) is covered, the received voice emitted from the speaker (15)
(2) becomes an obstacle, the level of the high frequency component is attenuated, and the sound pressure level in the high frequency range is reduced as shown by the broken line in the figure. As a result, there is a problem that the received voice that can be heard by the receiver becomes unclear. SUMMARY OF THE INVENTION It is an object of the present invention to provide a telephone capable of clearly receiving a reception voice emitted from a speaker of the telephone main body even in a state where the telephone receiver is housed in the telephone main body.

[0007]

A telephone according to the present invention comprises a telephone receiver, a telephone body having a built-in transmission / reception circuit and a speaker, and having a recessed storage portion for the telephone receiver. A sound emission hole of the speaker is opened at a position covered by the receiver housed in the unit,
The received voice signal obtained from the transmission / reception circuit can be output as the received voice from the speaker. The telephone body includes a detection unit that detects the presence or absence of the handset in the handset storage unit, and when the handset is detected by the detection unit, the level of the high-frequency component of the received voice signal to be supplied to the speaker is changed to the level of another frequency component. Frequency characteristic adjusting means for relatively increasing the frequency characteristic. The high-frequency component corresponds to a frequency band component whose level is attenuated when the receiver is stored in the receiver storage section of the telephone body.

In the telephone according to the present invention, when the receiver is stored in the receiver storing section of the telephone body, this state is detected, and the received voice signal obtained from the transmitting / receiving circuit is operated by the operation of the frequency characteristic adjusting means to obtain the frequency characteristic. After being processed by the adjusting means, the level of the high frequency component is increased relative to the level of the other frequency components, and then supplied to the speaker. The received voice signal supplied to the speaker is output as the received voice from the speaker. At this time, the level of the high frequency component of the received voice is attenuated by the receiver as an obstacle, but the received voice signal supplied to the speaker has the high frequency component level of another frequency component as described above. , The received voice transmitted from the telephone body to the receiver returns to the same frequency characteristic as the original received voice signal obtained from the transmission / reception circuit. Therefore, the received voice heard by the listener is clear.

On the other hand, when the receiver is not stored in the receiver storage section of the telephone body, the received voice signal obtained from the transmission / reception circuit is supplied to the speaker with almost no change in the frequency characteristics, and is output from the speaker as the received voice. You. At this time, since there is no obstacle such as a receiver in front of the sound output hole, the level of the high frequency component does not attenuate. Therefore, the received voice heard by the listener is clear.

Specifically, the frequency characteristic adjusting means includes:
The high frequency component of the received voice signal obtained from the transmitting / receiving circuit is extracted and added to the received voice signal obtained from the transmitting / receiving circuit,
It comprises a signal processing circuit for supplying the audio signal obtained to the speaker to the speaker, and on / off means for turning on / off the operation of the signal processing circuit according to the detection result of the detecting means.

In this specific configuration, the operation of the signal processing circuit is turned on in a state in which the telephone receiver is housed in the telephone body, and the receiving voice signal obtained from the transmitting and receiving circuit is added to the speaker. , That is, an audio signal in which the level of the high frequency component is increased. On the other hand, when the receiver is not stored in the telephone body, the operation of the signal processing circuit is turned off, and the received voice signal obtained from the transmission / reception circuit is supplied to the speaker as it is.

More specifically, the frequency characteristic adjusting means includes two capacitors having different capacities connected in parallel to a supply line of the received voice signal from the transmitting / receiving circuit to the speaker. It is composed of a filter circuit whose frequency characteristics can be adjusted by switching.

[0013] In this specific configuration, when the receiver is housed in the telephone body, a reception voice signal obtained from the transmission / reception circuit is supplied to the speaker via a small-capacity capacitor, and the receiver is housed in the telephone body. Otherwise, the power is supplied to the speaker via a large-capacity capacitor. Here, the capacitor functions as a filter, and a capacitor having a small capacity allows passage of a signal having a higher frequency component than a capacitor having a large capacity. Therefore, when the handset is stored in the phone body,
A received voice signal having a higher high-frequency component level is supplied to the speaker than in a state in which the telephone receiver is not housed in the telephone body.

More specifically, two amplifying circuits having different gains are switchably connected to the subsequent stage of the filter circuit, and the amplified audio signal is supplied to the speaker via one amplifying circuit.

In this specific configuration, in a state where the telephone receiver is housed in the telephone body, an audio signal obtained from the filter circuit is supplied to the speaker through an amplifier circuit having a large gain, and the telephone body is housed in the telephone body. When the speaker is not turned on, the signal is supplied to the speaker via an amplifier circuit having a small gain. Therefore, in a state where the receiver is stored in the telephone body, a received voice signal having a higher level as a whole, particularly a higher level of the high frequency component, is supplied to the speaker than in a state where the telephone body is not stored in the telephone body. Will be.

More specifically, a secondary battery serving as a power supply is built in the receiver, and a charging circuit is provided in the telephone body to close a charging line for the secondary battery by housing the receiver. , A detecting means detects the presence or absence of a receiver based on a potential difference between both ends of the resistor.

In this specific configuration, when the handset is housed in the telephone body, the charging line for the secondary battery closes, current flows through the charging line, and the potential difference between both ends of the resistor increases. The detecting means detects the receiver on the telephone body by detecting the increase in the potential difference.

More specifically, the telephone body includes a switch which is pressed by the telephone receiver while the telephone receiver is housed in the telephone body, and the detecting means detects the presence / absence of the telephone receiver based on the on / off state of the switch. I do. In this specific configuration, the switch is turned on by storing the receiver in the telephone main body, and the detecting means detects this state and detects the receiver on the telephone main body.

[0019]

According to the telephone according to the present invention, the level of the high-frequency component of the received voice signal to be supplied to the speaker is increased in advance when the telephone receiver is housed in the telephone main body. The received voice transmitted from the receiver to the receiver is adjusted to have substantially the same frequency characteristics as the original voice signal. Therefore, the received voice heard by the listener is clear.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to FIGS.
The embodiment of the present invention applied to a cordless telephone including a master unit and a slave unit as shown in FIG. Note that the telephones of the embodiments can set the speakerphone mode by operating keys not shown. FIG. 1 shows a circuit configuration of a telephone according to a first embodiment .
The slave unit (2) includes, for example, a rechargeable battery (25) having a full charge state of 4.5 V and a use limit of 3.6 V. A pair of positive and negative charging terminals (26) (26) are connected.

On the other hand, the master unit (1) is provided with a charging power supply circuit (3) for receiving a supply of AC 100V power and generating a DC 9V charging power, and the charging power supply circuit (3) comprises a pair of charging power circuits. Via a charging line (30a) (30b), a pair of positive and negative output terminals (13) (1
It is connected to 3). Also, a 56Ω resistor R for regulating the charging current is interposed in one charging line (30b). When the slave unit (2) is stored in the master unit (1), the pair of positive and negative charging terminals (26) and (26) of the slave unit (2) are respectively connected to the pair of positive and negative output terminals (13) of the master unit (1). ) Contact (13). With this, the parent machine
From the charging power supply circuit (3) of (1) to the secondary battery (25) of the slave unit (2)
Is supplied to the battery and the secondary battery (25) is charged.

A voltage detector is provided at both ends of the resistor R of the master unit (1).
(31) is connected. Note that the potential difference between both ends of the resistor R is
It is about 5 V during charging and about 0 V during non-charging.

The master unit (1) includes a transmitting / receiving circuit (33), a frequency characteristic adjusting circuit (4), a speaker amplifier (34), and a speaker (1).
5), the received voice signal obtained from the transmission / reception circuit (33) is supplied to the frequency characteristic adjustment circuit (4) and subjected to the processing described later, and then supplied to the speaker amplifier (34) and amplified.
The received voice is output from the speaker (15).

The frequency characteristic adjusting circuit (4) includes a transmitting / receiving circuit (3)
The first and second lines (41) and (4) extending from the output end of (3).
An adder (46) is connected to the ends of both lines (41) and (42), and the output end of the adder (46) is connected to the speaker amplifier (34). A high-pass filter (43), an amplifier (44) and a switch (45) are interposed in the first line (41).
The voltage detection signal output from the voltage detector (31) is supplied to a control circuit (32), and in response, the control circuit (32)
A switching signal for turning on / off the switch (45) is created and sent to the switch (45). As a result, the switch (45) is turned on / off as described later.

When the switch (45) is off, the received voice signal obtained from the transmitting / receiving circuit (33) is transmitted to the second line (42).
Only after passing through the adder (46) and the speaker amplifier (34)
Is supplied to the speaker (15). When the switch (45) is turned on, the received voice signal obtained from the transmission / reception circuit (33) is input from the second line (42) to one input terminal of the adder (46), and at the same time, the first line ( 41) High pass filter
The high frequency component is extracted through (43), the extracted high frequency component is supplied to the amplifier (44), amplified, and further switched (4).
The signal is input to the other input terminal of the adder (46) via 5). Thereby, the received voice signal obtained from the transmission / reception circuit (33) and the high frequency component of the received voice signal are added, and the high frequency emphasized voice signal obtained as a result is output from the speaker (15) as the received voice. You.

FIG. 2 shows a switch by the control circuit (32).
This shows the procedure of on / off control of (45). First, in step S1, it is determined whether or not the speakerphone mode has been set.
Repeat the judgment of 1. On the other hand, if it is determined YES in step S1, the process proceeds to step S2 to determine whether the level V of the voltage detection signal supplied from the voltage detector (31) exceeds a predetermined value Vo. . Here, the predetermined value Vo
Is set to, for example, 0.7 V. When the voltage detection signal V becomes about 5 V in a state where the slave unit (2) is housed in the master unit (1), it is determined to be YES, and the slave unit (2) is set to the master unit. When the voltage detection signal V becomes 0 V in the state of lifting from (1), it is determined to be no. If the answer is affirmative in step S2, the process proceeds to step S3, where the switch (45) is turned on (closed), and the procedure is terminated. On the other hand, if NO is determined in step S2, the process proceeds to step S4 and the switch (45)
After turning off (opening), the procedure ends.

FIGS. 3A to 3E show the steps of signal processing by the frequency characteristic adjusting circuit (4). FIG.
Is the frequency characteristic of the audio signal A output from the transmission / reception circuit (33), FIG. 2B is the frequency characteristic of the high-pass filter (43),
FIG. 3C shows the frequency characteristic of the signal B output from the high-pass filter 43, FIG. 4D shows the frequency characteristic of the high-frequency emphasized audio signal C output from the adder 46, and FIG. ) Is the handset (2)
Represents the frequency characteristics of the received voice transmitted to the listener's ear due to the attenuating effect of the receiver. When the speakerphone mode is set after the slave unit (2) is stored in the master unit (1), the switch (45) is turned on, and the first line (41) is closed. Thereby, the received voice signal shown in FIG. 3A is input to the high-pass filter (43) having the frequency characteristic shown in FIG.
The high frequency component shown in FIG. Furthermore, after the high frequency component is amplified by the amplifier (44), the adder (46)
It is added to the received voice signal of FIG. 7A supplied from the second line (42). As a result, a high-frequency emphasized audio signal C in which the high-frequency component is emphasized is created as shown in FIG. The high-frequency emphasized audio signal C is amplified through the speaker amplifier (34) and then emitted from the speaker (15) as a received voice. At this time, since the sound emission hole (18) of the master unit (1) is covered by the slave unit (2), the reception sound emitted from the speaker (15) is indicated by an arrow in FIG. Thus, the high-frequency component is attenuated in the same manner as shown in FIG.
Will be received voice A 'having substantially the same frequency characteristics as will be transmitted to the listener's ear.

On the other hand, the child device (2) is stored in the child device storage portion (1) of the parent device (1).
When the speakerphone mode is set by lifting from the position 2), the switch (45) is turned off, the first line (41) is opened, and the received voice signal A shown in FIG. ) Is supplied to the speaker amplifier (34). In this case, since the sound emission hole (18) of the master unit (1) is not covered by the slave unit (2), the received sound emitted from the speaker (15) is
The signal does not receive the attenuation effect of (2), and is transmitted to the listener's ear as a received voice A 'having substantially the same frequency characteristics as the original received voice signal A as shown in FIG.

Therefore, according to the telephone of the present embodiment,
(2) is stored in the parent device (1), and the child device (2) is stored in the parent device.
In any state of the state lifted from (1), the received voice obtained in the speakerphone mode is clear.

Second Embodiment The telephone according to the second embodiment has a frequency characteristic adjusting circuit shown in FIG.
Instead of (4), a frequency characteristic adjusting circuit (5) shown in FIG. 4 is employed, and other configurations are the same as those of the first embodiment, so that illustration and description are omitted. In the frequency characteristic adjusting circuit (5) shown in FIG. 4, a resistor r is interposed in a signal supply line (51) for connecting a transmitting / receiving circuit and a speaker amplifier (both not shown) to each other. Two first and second parallel lines (52) and (53) are connected,
A capacitor C1 having a small capacitance of 1000 pF is interposed in the first parallel line (52), and a capacitor 470 is connected to the second parallel line (53).
The capacitor C2 having a large capacitance of 0 pF is interposed.

The other ends of the first and second parallel lines (52) and (53) are
Grounded via switch (54). Switch (54)
Is a first parallel line (52) at terminal a, and a second parallel line at terminal b.
(53) is connected. The switch (54) is connected to the control circuit
Switching between the terminals a and b is performed by a switching signal supplied from a switch (not shown). The switching signal is generated based on the voltage detection signal obtained from the voltage detector (31), as in the first embodiment. By the switching signal, the switch (54) is set to a terminal a when the slave unit (2) is housed in the master unit (1), and when the slave unit (2) is removed from the master unit (1). Switch to terminal b.

The solid line in FIG. 5 represents the capacitor C1 and the resistor r.
, The broken line represents the frequency characteristic of the second filter circuit composed of the capacitor C2 and the resistor r. As shown, the output level of the second filter circuit is lower than that of the first filter circuit in a high frequency range. Therefore, the received voice signal that has passed through the first filter circuit has a relatively higher high frequency than the received voice signal that has passed through the second filter circuit. As a result, the same frequency adjustment effect as in the first embodiment can be obtained.

Third Embodiment The frequency characteristic adjusting circuit (6) of the present embodiment is similar to the second embodiment shown in FIG.
A pair of amplifiers (62) and (63) having different gains are provided in parallel at the subsequent stage of the frequency characteristic adjusting circuit (5) of the embodiment via a second switch (61) as shown in FIG. And one terminal c of the second switch (61) is connected to an amplifier (6
2) is connected, and an amplifier (63) having a small gain is connected to the other terminal d. The second switch (61) is switched between a terminal c and a terminal d by a switching signal common to the first switch (54). Thereby, the handset (2)
Is stored in the base unit (1), the first switch (54)
Is switched to the terminal a and the second switch (61) is switched to the terminal c to realize the frequency characteristic indicated by the solid line in FIG. 7, and the slave unit (2) is taken out of the master unit (1). The first switch (54) is switched to the terminal "b" and the second switch (61) is switched to the terminal "d" to realize the frequency characteristic shown by the broken line in FIG.

Therefore, as in the second embodiment, the received voice signal obtained when the slave unit (2) is housed in the master unit (1) by the processing of the frequency characteristics shown in FIG. With respect to the received voice signal obtained when (2) is taken out of the master unit (1), the high frequency range is relatively increased, and the level of the entire frequency band is raised as a whole. This prevents a decrease in the audio output level due to the intervening first and second filter circuits.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, in the above-described first to third embodiments, the presence or absence of the slave unit (2) in the master unit (1) is detected by a change in the potential difference between both ends of the resistor R. A configuration is employed in which the presence / absence of the slave unit (2) is detected based on the on / off state of a well-known on-hook switch pressed by the slave unit (2) with the (2) stored in the master unit (1). It is also possible.

In the first embodiment, the amplifier (44) of the frequency characteristic adjusting circuit (4) has a constant gain. Alternatively, the gain can be changed arbitrarily. It is also possible to adopt a configuration in which a simple amplifier is adopted and the amount of enhancement of the high frequency component can be adjusted by the operation of the listener. The present invention can also be implemented in a telephone in which a base unit (telephone body) and a slave unit (receiver) are connected by a cord.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a telephone according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure of switch on / off control by a control circuit.

FIG. 3 is a frequency characteristic diagram illustrating a process of signal processing.

FIG. 4 is a circuit diagram illustrating a configuration of a frequency characteristic adjustment circuit according to a second embodiment.

FIG. 5 is a graph showing two frequency characteristics realized by the second embodiment.

FIG. 6 is a circuit diagram illustrating a configuration of a frequency characteristic adjustment circuit according to a third embodiment.

FIG. 7 is a graph showing two frequency characteristics realized by the third embodiment.

FIG. 8 is a perspective view showing a state in which a child device is stored in a parent device in a conventional telephone.

FIG. 9 is a perspective view showing the appearance of a conventional master unit.

FIG. 10 is a perspective view illustrating an appearance of a conventional slave unit.

FIG. 11 is a graph showing frequency characteristics of two types of received voices obtained by a conventional telephone.

[Explanation of symbols]

 (1) Master unit (15) Speaker (2) Slave unit (25) Secondary battery (31) Voltage detector (32) Control circuit (33) Transmitter / receiver circuit (34) Speaker amplifier (4) Frequency characteristic adjustment circuit (41 ) 1st line (42) 2nd line (43) High pass filter (44) Amplifier (45) Switch (46) Adder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-139788 (JP, A) JP-A-4-328940 (JP, A) JP-A-7-131268 (JP, A) JP-A-3-3 262239 (JP, A) Japanese Utility Model Hei 2-57645 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 1/00 H04M 1/24-1/253 H04M 1/58- 1/62 H04M 1/66-1/82

Claims (6)

(57) [Claims] 1. A telephone set including a receiver, a transmitting / receiving circuit and a speaker, and a telephone body having a recessed storage portion for the receiver. The telephone body is provided at a position covered by the receiver stored in the receiver storage portion. A telephone having a sound emitting hole of the speaker, and capable of outputting a received voice signal obtained from a transmission / reception circuit as a received voice from the speaker, wherein the telephone body comprises: a detecting means for detecting the presence or absence of the handset in the handset housing. And frequency characteristic adjusting means for increasing the level of the high frequency component of the received voice signal to be supplied to the speaker relative to the level of other frequency components when the receiver is detected by the detecting means. A telephone characterized by the following. 2. The frequency characteristic adjusting means extracts a high-frequency component of a received voice signal obtained from a transmitting / receiving circuit, and adds the high-frequency component to a received voice signal obtained from the transmitting / receiving circuit.
2. A signal processing circuit for supplying an audio signal obtained as described above to a speaker, and on / off means for turning on / off the operation of the signal processing circuit in accordance with a detection result of the detection means.
Phone. 3. The frequency characteristic adjusting means includes two capacitors having different capacities connected in parallel to a supply line of a reception voice signal from a transmission / reception circuit to a speaker, and switching the capacitors to change the frequency characteristics. 2. The telephone according to claim 1, wherein the telephone comprises an adjustable filter circuit. 4. The amplifier according to claim 3, wherein two amplifier circuits having different gains are switchably connected to a stage subsequent to the filter circuit, and the audio signal amplified through one of the amplifier circuits is supplied to a speaker. Phone. 5. A receiver has a built-in secondary battery serving as a power supply, and a telephone body is provided with a charging circuit for closing a charging line for the secondary battery by housing the receiver. The telephone according to any one of claims 1 to 4, wherein a handset is interposed, and the detecting means detects the presence or absence of the handset based on a potential difference between both ends of the resistor. 6. A telephone set according to claim 1, wherein said telephone body includes a switch which is pressed by said telephone receiver in a state where said telephone receiver is housed in said telephone body, and said detecting means detects presence / absence of said telephone receiver based on an on / off state of said switch. The telephone according to claim 4.