Two-way radio with voice storage

• US 5,109,525 A
• Filed: 01/23/1991
• Issued: 04/28/1992
• Est. Priority Date: 12/02/1988
• Status: Expired due to Fees

• Current Assignee: A Delaware Corporation
• Original Assignee: A Delaware Corporation
• Inventors: Nichols, Daniel K.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): CHAROUEL, LISA
• Application Number:
  US07/644,754
• Time in Patent Office: 461 Days
• Field of Search: 455/78, 455/79, 455/82, 455/89, 455/74, 369/6, 369/7, 370/61, 375/5
• US Class Current: 455/74
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• CPC Class Codes: H04M 1/72433 for voice messaging, e.g. dictaphones for answering incoming calls H04M1/64
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Abstract

A two-way radio includes a receiver having a squelch circuit for determining if a communication channel is available. A transmitter is provided for transmitting voice messages on the channel. When the communication channel is available, voice signals are directed from a microphone to the transmitter for transmission. When the communication channel is not available, the voice signals are automatically directed to a digitizer there they are digitized. The digitized voice signals are stored in a memory for later transmission when the channel becomes available.

Claims

1. A two-way radio comprising:

a receiver including a squelch circuit for determining if a communication channel is available;

a transmitter for transmitting voice messages on the communication channel;

voice input means including a microphone and an activation switch;

voice storage means including a digitizer for digitizing voice signals and a memory for storing digitized voice signals; and

control means responsive to the activation switch and to said squelch circuit, the control means automatically directing voice signals from the microphone to the transmitter for transmission without digitizing or storing the voice message if the communication channel is available and to the digitizer for digitizing and then to the voice storage means for storage in the memory if the communication channel is not available.

2. A two-way radio as defined in claim 1, in which:

the control means is further responsive to said receiver means to automatically direct voice messages from the voice storage means to the transmitter for transmission when said communication channel becomes available.

3. A two-way radio as defined in claim 1, in which:

the voice storage means further includes a digital-to-analog converter for converting stored digitized voice signals to analog signals prior to transmission.

4. A two-way radio comprising:

a receiver including a squelch circuit for determining if a communication channel is available;

a transmitter for transmitting voice messages on the communication channel;

voice input means including a microphone and an activation switch;

voice storage means including a digitizer for digitizing voice signals and a memory for storing digitized voice signals, the voice storage means further includes a digital-to-analog converter for converting stored digitized voice signals to analog signals prior to transmission; and

control means responsive to the activation switch and to said squelch circuit, the control means automatically directing voice signals from the microphone to the transmitter for transmission without digitizing or storing the voice message if the communication channel is available and to the voice storage means for storage in the memory if the communication channel is not available, the control means is further responsive to said receiver means to automatically direct messages from the voice storage means to the transmitter for transmission when said communication channel becomes available.

5. The two-way radio of claim 4, further including:

a timer means for adding a random time delay to any messages which are stored in the storage means prior to the message being transmitted by the transmitter after the communication channel becoming available.