JPH0828767B2 - Answering machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an answering machine, and more particularly to an answering machine using a digital memory element as a message storage element.

[Conventional technology]

Conventionally, with this type of answering machine, when there is an incoming call in the answering machine setting state, an automatic incoming call response is made and a message for reply is sent to the other party to notify the other party, and then the message from the other party is recorded and stored in the digital memory. However, even if the other party does not talk during recording or ends the call, the recording state is maintained for a preset time.

[Problems to be Solved by the Invention]

Since the conventional answering machine described above is configured to hold the digital memory in a recordable state for a preset time for recording the message of the other party after the automatic incoming call,
If the other party does not talk or ends the call during recording, the digital memory has a drawback that silent or busy tone is recorded and valuable digital memory is not effectively used.

[Means for solving the problem]

The answering machine of the present invention is an answering machine which automatically answers an incoming call at the time of an incoming call, sends a reply message recorded in advance to the other party, and A / D-converts the message of the other party to record it in a digital memory. Judgment means for judging that the state of the other party voice signal after sending the response message does not reach the preset level continues for a certain period of time set in advance, and the output of this decision means to the digital memory of the other party voice signal. Storage control means for invalidating the recording storage of the recording medium, the determination means is a high-pass filter for removing a busy tone from the line, a rectifying circuit for rectifying the voice signal of the other party, and a monitoring period output from the storage control means. The analog integration circuit that integrates and stores the rectified output of the partner voice signal during the recording monitoring period based on the control signal of And a comparison circuit that determines whether the output of the comparison circuit is invalid with respect to a preset reference value, the storage control unit outputs the control signal for the monitoring period and the output of the comparison circuit is in a silent state. When the determination is made, the control circuit has a control circuit for returning the address for the digital memory to the recording start address and recording and storing the address from the next recording start address.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

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

In FIG. 1, the answering machine of the present embodiment has a call circuit 6 connected to a telephone line (not shown) via a line terminal 1 and a hook switch 3, and an incoming call detection circuit 4 for detecting an incoming call from the telephone line. A tone ringer circuit 2 that generates a ringing tone when an incoming call arrives, a switch 5 that forms a loop of the telephone line by off-hook, and a digital memory 8 that stores a response message and a message from the other party.
And a D / A conversion circuit for converting the digital message signal from the digital memory 8 into an analog signal (hereinafter referred to as D / A)
9, an amplifier 10 that amplifies the output of the D / A 9 and sends it to the telephone line, an amplifier 11 that amplifies a partner message signal from the telephone line, and an A / that converts an analog signal of the amplifier 11 into a digital signal. A D conversion circuit (hereinafter referred to as A / D) 12, a silence detection circuit 15 that detects the silence state of the other party during a call, a switch 13 that sets an absence state, and a lamp 14 that indicates that recording is stored. , A digital memory 8, D / A9, A / D12, a silence detecting circuit 15, and a control circuit 7 for monitoring and controlling the internal state of the answering machine of the present embodiment. A high-pass filter 16 for removing a busy tone from the circuit, a rectifier circuit 17 for rectifying the output signal of the high-pass filter 16, an analog integrator circuit 18 for analog-integrating the output signal of the rectifier circuit 17 by a control signal from the control circuit 7, The reference level is beforehand A reference value setting circuit 19 are constant, the control circuit 7 compares the reference level from the output signal and the reference value setting circuit 19 of the analog integrator circuit 18
And a comparison circuit 20 for transmitting a determination signal to

 Next, the operation of this embodiment will be described.

When a ringing tone signal arrives at the line terminal 1, a ringing tone is generated from the tone ringer circuit 2 to notify the incoming call, and the incoming call detection circuit 4 detects the incoming call and monitors and controls various states of the answering machine of this embodiment. The control circuit 7 controls the switch 5 for loop formation by ANDing with the switch 13 for setting the answering machine, closing the loop of the telephone line and putting the answering machine of this embodiment into the incoming state.

On the other hand, the control circuit 7 stores the digital memory 8 in the AD of the control circuit 7.
Specify the response message memory address from the R pin, and
The read mode is set from the / R terminal, the data is read from the I / D terminal, the D / A9 is controlled from the DAC terminal, the data is output from the DO terminal, and converted to an analog signal by the D / A9. After amplifying to an appropriate signal level, the line terminal 1 sends a response message to the other party. After the completion of sending the response message, the control circuit 7 controls the A / D 12 from the terminal ADC in order to record and store the other party message, and the other party voice message from the amplifier 11 is converted into a digital signal by the A / D 12 digital voice message control. The digital memory 8 is fetched from the DI terminal, at the same time, the memory address is specified from the ADR terminal to the digital memory 8, the W / R terminal is set to the write mode, and the digital voice message is stored in the digital memory 8 from the 1/0 terminal. In parallel with this, the silence detection circuit 15 sends out from the central office to the answering machine side of this embodiment when the other party puts the handset on the way and goes off-hook in order to check the level of the other party's voice signal. The output of the rectifier circuit 17 for exchanging the output voice signal of the high-pass filter 16 for removing the busy tone into a DC signal is added to the analog integrator circuit 18,
The analog integrator circuit 18 receives the initial clear control signal and the control signal of the monitoring period from the TM terminal of the control circuit 7, and the line terminal 1
The integrated signal corresponding to the voice level and the generation time input from is stored. A reference value for determining the output of the analog integrator circuit 18 as a silent signal is set by the reference value setting circuit 19, the both are compared by the comparison circuit 20, and output to the FL terminal of the control circuit 7. When it is determined that the output of the comparison circuit 20 received at the FL terminal is in the silent state, the control circuit 7 determines that the signal recorded and stored this time is invalid, and the start address of the digital memory 8 in the write mode is set. It is stored back to the head address at the time of recording this time, and at the time of the next recording storage, it is operated so as to record from this address.

In addition, the hook switch 3 and the call circuit 6 are provided as a function of the telephone at the time of talking with a normal partner.
14 is controlled from the LA terminal of the control circuit 7 so as to indicate that the message from the other party is recorded and stored.

Further, in this embodiment, circuits such as a microphone necessary for blowing a response message, a circuit for reproducing a recording signal by a speaker and switches for instructing recording / erasing are omitted since they are not directly related to the present invention. ing.

〔The invention's effect〕

As described above, according to the present invention, in order to check the level of the other party's voice signal in the judging means, it is assumed that the other party is on-hook during recording of the other party's message, and the busy tone to be transmitted from the central office exchange is removed. Since a high-pass filter is set, it has the effect of reliably catching the silence state of the other party's voice signal.

Further, since the analog integrator circuit stores the integrated amount of the rectified output of the partner voice signal during the monitoring period, and the comparator circuit compares the integrated amount during the partner voice generation period with the reference value, it is temporary. It has the effect of ignoring the momentary drop in the voice signal level and silence, and making a judgment from the whole person without interrupting the other party's voice.

Further, when the control circuit determines that the output of the comparison circuit is in the silent state, it determines that the signal recorded and stored this time is invalid, and sets the start address of the digital memory in the write mode to the start address of the current recording. It is stored back to the address, and the recording is controlled to start from this address at the time of the next recording storage. Therefore, it is possible to effectively use the digital memory and improve the operability. There is.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention. 1 ... Line terminal, 2 ... Tone ringer circuit, 3 ... Hook switch, 4 ... Incoming call detection circuit, 5 ... Switch, 6 ... Call line, 7 ... Control circuit, 8 ... Digital memory, 9 ... D / A conversion circuit (D / A), 10 ... Amplifier, 11 ... Amplifier, 12 ... A / D conversion circuit (A / D), 13 ... Switch, 14 ... Lamp, 15 ... Silence detection circuit, 16 ... High pass filter, 17 ... Rectifier circuit, 18 ... Analog integrator circuit, 19 ... Reference value setting circuit, 10 ... Comparison circuit.

Claims (1)

[Claims] 1. An answering machine in an answering machine which automatically answers an incoming call when a call arrives, sends a reply message recorded in advance to the other party, and A / D-converts the message of the other party to record in a digital memory. Determination means for determining that the state in which the other party voice signal after transmission does not reach a preset level continues for a preset period.
Storage means for invalidating the recording and storing of the other party's voice signal in the digital memory according to the output of this determining means, and the determining means has a high-pass filter for removing busy tone from the line, and the other party's voice signal. A rectifying circuit for rectifying the rectifying signal, an analog integrating circuit for integrating and storing the rectified output of the partner audio signal in the recording monitoring period based on the control signal of the monitoring period output from the storage control means, and the output of the analog integrating circuit A storage circuit for determining whether or not it is invalid with respect to a set reference value, and the storage control means outputs a control signal for the monitoring period and determines that the output of the comparison circuit is in a silent state. The address for the digital memory is returned to the address where the recording was started, and the next recording start is recorded from the address of the previous recording start. Answering machine, characterized in that it comprises a control circuit to be stored.